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SY89837UMG-TR

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Encoders, Decoders, Multiplexers & Demultiplexers
Manufacturer: Microchip


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SY89837UMG-TR
Microchip

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SY89837UMG-TR
Microchip

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Manufacturer
Microchip
Product Category
Encoders, Decoders, Multiplexers & Demultiplexers
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Y Icon ROHS
Product
Multiplexers
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Smd/Smt
Package / Case
MLF-32
Packaging
Reel
Brand
Microchip Technology / Micrel
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? Precision Edge PRECISION 1:8 LVPECL FANOUT SY89837U Micrel, Inc. ? Precision Edge BUFFER WITH 2:1 RUNT PULSE SY89837U ELIMINATOR INPUT MUX FEATURES ? Selects between two clocks, and provides 8 ? Precision Edge precision, low skew LVPECL output copies ? Guaranteed AC performance over temperature and DESCRIPTION supply voltage: ? Wide operating frequency: 1kHz to >1.5GHz The SY89837U is a low jitter, low skew, high-speed 1:8 ? <975ps in-to-out t pd fanout buffer with a unique, 2:1 differential input multiplexer ? <180ps t /t (MUX) optimized for clock redundant switchover applications. r f Unlike standard multiplexers, the SY89837U unique 2:1 runt ? <40ps output-to-output skew pulse eliminator (RPE) input MUX prevents any short cycles ? Unique input isolation design minimizes crosstalk or ?runt? pulses during switchover. In addition, a unique ? Ultra-low jitter design: fail-safe input protection prevents metastable conditions ? 150fs RMS phase jitter when the selected input clock fails to a static DC differential voltage (differential input voltage drops below 200mV). ? <0.7ps MUX crosstalk induced jitter rms The SY89837U distributes clock frequencies from 1kHz to ? Unique input termination and VT pin accepts DC- or 1.5GHz, guaranteed, over temperature and voltage. AC-coupled inputs (CML, PECL, LVDS) The differential input includes Micrel?s unique, 3-pin input ? 800mV LVPECL output swing termination architecture that allows customers to interface ? Power supply +2.5V ?5% or +3.3V ?10% to any differential signal (AC- or DC-coupled) as small as ? ?40?C to +85?C industrial temperature range 200mV without any level shifting or termination resistor networks in the signal path. The outputs are 800mV, 100k ? Available in 32-pin (5mm x 5mm) QFN package compatible LVPECL with fast rise/fall times guaranteed to be less than 200ps. The SY89837U operates from a +2.5V ?5% or +3.3V ?10% supply and is guaranteed over the full industrial temperature range of ?40?C to +85?C. The SY89837U is part of Micrel?s ? high-speed, Precision Edge product line. APPLICATIONS All support documentation can be found on Micrel?s web site at: www.micrel.com. ? Redundant clock distribution ? Fail-safe clock protection Precision Edge is a registered trademark of Micrel, Inc. Rev.: F Amendment: /0 M9999-060410 1 Issue Date: June 2010 hbwhelp@micrel.com or (408) 955-1690? Precision Edge PRECISION 1:8 LVPECL FANOUT SY89837U Micrel, Inc. ? Precision Edge BUFFER WITH 2:1 RUNT PULSE SY89837U ELIMINATOR INPUT MUX FEATURES ? Selects between two clocks, and provides 8 ? Precision Edge precision, low skew LVPECL output copies ? Guaranteed AC performance over temperature and DESCRIPTION supply voltage: ? Wide operating frequency: 1kHz to >1.5GHz The SY89837U is a low jitter, low skew, high-speed 1:8 ? <975ps in-to-out t pd fanout buffer with a unique, 2:1 differential input multiplexer ? <180ps t /t (MUX) optimized for clock redundant switchover applications. r f Unlike standard multiplexers, the SY89837U unique 2:1 runt ? <40ps output-to-output skew pulse eliminator (RPE) input MUX prevents any short cycles ? Unique input isolation design minimizes crosstalk or ?runt? pulses during switchover. In addition, a unique ? Ultra-low jitter design: fail-safe input protection prevents metastable conditions ? 150fs RMS phase jitter when the selected input clock fails to a static DC differential voltage (differential input voltage drops below 200mV). ? <0.7ps MUX crosstalk induced jitter rms The SY89837U distributes clock frequencies from 1kHz to ? Unique input termination and VT pin accepts DC- or 1.5GHz, guaranteed, over temperature and voltage. AC-coupled inputs (CML, PECL, LVDS) The differential input includes Micrel?s unique, 3-pin input ? 800mV LVPECL output swing termination architecture that allows customers to interface ? Power supply +2.5V ?5% or +3.3V ?10% to any differential signal (AC- or DC-coupled) as small as ? ?40?C to +85?C industrial temperature range 200mV without any level shifting or termination resistor networks in the signal path. The outputs are 800mV, 100k ? Available in 32-pin (5mm x 5mm) QFN package compatible LVPECL with fast rise/fall times guaranteed to be less than 200ps. The SY89837U operates from a +2.5V ?5% or +3.3V ?10% supply and is guaranteed over the full industrial temperature range of ?40?C to +85?C. The SY89837U is part of Micrel?s ? high-speed, Precision Edge product line. APPLICATIONS All support documentation can be found on Micrel?s web site at: www.micrel.com. ? Redundant clock distribution ? Fail-safe clock protection Precision Edge is a registered trademark of Micrel, Inc. Rev.: F Amendment: /0 M9999-060410 1 Issue Date: June 2010 hbwhelp@micrel.com or (408) 955-1690? Precision Edge SY89837U Micrel, Inc. TYPICAL APPLICATIONS CIRCUIT Figure 1. Simpli?ed Example Illustrating Runt Pulse Eliminator (RPE) Circuit When Primary Clock Fails TRUTH TABLE Inputs Outputs IN0 /IN0 IN1 /IN1 SEL Q /Q 0 1 X X 0 0 1 1 0 X X 0 1 0 X X 0 1 1 0 1 X X 1 0 1 1 0 M9999-060410 2 hbwhelp@micrel.com or (408) 955-1690? Precision Edge PRECISION 1:8 LVPECL FANOUT SY89837U Micrel, Inc. ? Precision Edge BUFFER WITH 2:1 RUNT PULSE SY89837U ELIMINATOR INPUT MUX FEATURES ? Selects between two clocks, and provides 8 ? Precision Edge precision, low skew LVPECL output copies ? Guaranteed AC performance over temperature and DESCRIPTION supply voltage: ? Wide operating frequency: 1kHz to >1.5GHz The SY89837U is a low jitter, low skew, high-speed 1:8 ? <975ps in-to-out t pd fanout buffer with a unique, 2:1 differential input multiplexer ? <180ps t /t (MUX) optimized for clock redundant switchover applications. r f Unlike standard multiplexers, the SY89837U unique 2:1 runt ? <40ps output-to-output skew pulse eliminator (RPE) input MUX prevents any short cycles ? Unique input isolation design minimizes crosstalk or ?runt? pulses during switchover. In addition, a unique ? Ultra-low jitter design: fail-safe input protection prevents metastable conditions ? 150fs RMS phase jitter when the selected input clock fails to a static DC differential voltage (differential input voltage drops below 200mV). ? <0.7ps MUX crosstalk induced jitter rms The SY89837U distributes clock frequencies from 1kHz to ? Unique input termination and VT pin accepts DC- or 1.5GHz, guaranteed, over temperature and voltage. AC-coupled inputs (CML, PECL, LVDS) The differential input includes Micrel?s unique, 3-pin input ? 800mV LVPECL output swing termination architecture that allows customers to interface ? Power supply +2.5V ?5% or +3.3V ?10% to any differential signal (AC- or DC-coupled) as small as ? ?40?C to +85?C industrial temperature range 200mV without any level shifting or termination resistor networks in the signal path. The outputs are 800mV, 100k ? Available in 32-pin (5mm x 5mm) QFN package compatible LVPECL with fast rise/fall times guaranteed to be less than 200ps. The SY89837U operates from a +2.5V ?5% or +3.3V ?10% supply and is guaranteed over the full industrial temperature range of ?40?C to +85?C. The SY89837U is part of Micrel?s ? high-speed, Precision Edge product line. APPLICATIONS All support documentation can be found on Micrel?s web site at: www.micrel.com. ? Redundant clock distribution ? Fail-safe clock protection Precision Edge is a registered trademark of Micrel, Inc. Rev.: F Amendment: /0 M9999-060410 1 Issue Date: June 2010 hbwhelp@micrel.com or (408) 955-1690? Precision Edge PRECISION 1:8 LVPECL FANOUT SY89837U Micrel, Inc. ? Precision Edge BUFFER WITH 2:1 RUNT PULSE SY89837U ELIMINATOR INPUT MUX FEATURES ? Selects between two clocks, and provides 8 ? Precision Edge precision, low skew LVPECL output copies ? Guaranteed AC performance over temperature and DESCRIPTION supply voltage: ? Wide operating frequency: 1kHz to >1.5GHz The SY89837U is a low jitter, low skew, high-speed 1:8 ? <975ps in-to-out t pd fanout buffer with a unique, 2:1 differential input multiplexer ? <180ps t /t (MUX) optimized for clock redundant switchover applications. r f Unlike standard multiplexers, the SY89837U unique 2:1 runt ? <40ps output-to-output skew pulse eliminator (RPE) input MUX prevents any short cycles ? Unique input isolation design minimizes crosstalk or ?runt? pulses during switchover. In addition, a unique ? Ultra-low jitter design: fail-safe input protection prevents metastable conditions ? 150fs RMS phase jitter when the selected input clock fails to a static DC differential voltage (differential input voltage drops below 200mV). ? <0.7ps MUX crosstalk induced jitter rms The SY89837U distributes clock frequencies from 1kHz to ? Unique input termination and VT pin accepts DC- or 1.5GHz, guaranteed, over temperature and voltage. AC-coupled inputs (CML, PECL, LVDS) The differential input includes Micrel?s unique, 3-pin input ? 800mV LVPECL output swing termination architecture that allows customers to interface ? Power supply +2.5V ?5% or +3.3V ?10% to any differential signal (AC- or DC-coupled) as small as ? ?40?C to +85?C industrial temperature range 200mV without any level shifting or termination resistor networks in the signal path. The outputs are 800mV, 100k ? Available in 32-pin (5mm x 5mm) QFN package compatible LVPECL with fast rise/fall times guaranteed to be less than 200ps. The SY89837U operates from a +2.5V ?5% or +3.3V ?10% supply and is guaranteed over the full industrial temperature range of ?40?C to +85?C. The SY89837U is part of Micrel?s ? high-speed, Precision Edge product line. APPLICATIONS All support documentation can be found on Micrel?s web site at: www.micrel.com. ? Redundant clock distribution ? Fail-safe clock protection Precision Edge is a registered trademark of Micrel, Inc. Rev.: F Amendment: /0 M9999-060410 1 Issue Date: June 2010 hbwhelp@micrel.com or (408) 955-1690? Precision Edge SY89837U Micrel, Inc. TYPICAL APPLICATIONS CIRCUIT Figure 1. Simpli?ed Example Illustrating Runt Pulse Eliminator (RPE) Circuit When Primary Clock Fails TRUTH TABLE Inputs Outputs IN0 /IN0 IN1 /IN1 SEL Q /Q 0 1 X X 0 0 1 1 0 X X 0 1 0 X X 0 1 1 0 1 X X 1 0 1 1 0 M9999-060410 2 hbwhelp@micrel.com or (408) 955-1690? Precision Edge SY89837U Micrel, Inc. PACKAGE/ORDERING INFORMATION (1) Ordering Information Package Operating Package Lead Part Number Type Range Marking Finish SY89837UMG QFN-32 Industrial SY89837U with Pb-Free Pb-Free bar-line indicator NiduAu (2) SY89837UMGTR QFN-32 Industrial SY89837U with Pb-Free Pb-Free bar-line indicator NiduAu Notes: 1. Contact factory for die availability. Dice are guaranteed at T = 25?C, DC Electricals only. A 2. Tape and Reel. 32-Pin QFN PIN DESCRIPTION Pin Number Pin Name Pin Function 1, 3, IN0, /IN0, Differential Inputs: These input pairs are the differential signal inputs to the device. These inputs 6, 8 IN1, /IN1 accept AC- or DC-coupled signals as small as 200mV. Each pin of a pair internally terminates to a VT pin through 50?. Please refer to the ?Input Interface Applications? section for more details. 2, 7 VT0, VT1 Input Termination Center-Tap: Each side of the differential input pair terminates to a VT pin. The VT0 and VT1 pins provide a center-tap to a termination network for maximum interface ?exibility. See the ?Input Interface Applications? section for more details. 31 SEL This single-ended TTL/CMOS-compatible input selects the inputs to the multiplexer. This input is internally connected to a 25k? pull-up resistor and will default to a logic HIGH state if left open. 9, 19, 22, 32 VCC Positive power supply. Bypass with low ESR capacitors as close to the pins as possible. 30, 28, 26, 24, Q0 ? Q7, Differential Outputs: These LVPECL output pairs are the outputs of the device. They are a logic 18, 16, 14, 12, /Q0 ? /Q7 function of the IN0, IN1, and SEL inputs. Please refer to the truth table for details. Unused 29, 27, 25, 23, output pairs may be left open. 17, 15, 13, 11 20,21 GND, Ground. Ground and exposed pad to be tied together to most negative potential of chip. Exposed Pad 10 CAP Power-On Reset (POR) Initialization Capacitor. When using the multiplexer with RPE capability, this pin is tied to a capacitor to V . The purpose is to ensure the internal RPE logic starts up in CC a known state. If this pin is tied to V , the RPE function will be disabled and the multiplexer will CC function as a normal multiplexer. See ?Application? section for more details. The CAP pin should never be left open. 4,5 VREF-AC0 Reference Voltage: These outputs bias to V - 1.2V. They are used for AC-coupling inputs CC VREF-AC1 (IN,/IN). Connect VREF_AC directly to the VT pin. Bypass with 0.01?F low ESR capacitor to VCC. See "Input Interface Applications" section. Maximum sink/source current is ?1.5mA. M9999-060410 3 hbwhelp@micrel.com or (408) 955-1690? Precision Edge PRECISION 1:8 LVPECL FANOUT SY89837U Micrel, Inc. ? Precision Edge BUFFER WITH 2:1 RUNT PULSE SY89837U ELIMINATOR INPUT MUX FEATURES ? Selects between two clocks, and provides 8 ? Precision Edge precision, low skew LVPECL output copies ? Guaranteed AC performance over temperature and DESCRIPTION supply voltage: ? Wide operating frequency: 1kHz to >1.5GHz The SY89837U is a low jitter, low skew, high-speed 1:8 ? <975ps in-to-out t pd fanout buffer with a unique, 2:1 differential input multiplexer ? <180ps t /t (MUX) optimized for clock redundant switchover applications. r f Unlike standard multiplexers, the SY89837U unique 2:1 runt ? <40ps output-to-output skew pulse eliminator (RPE) input MUX prevents any short cycles ? Unique input isolation design minimizes crosstalk or ?runt? pulses during switchover. In addition, a unique ? Ultra-low jitter design: fail-safe input protection prevents metastable conditions ? 150fs RMS phase jitter when the selected input clock fails to a static DC differential voltage (differential input voltage drops below 200mV). ? <0.7ps MUX crosstalk induced jitter rms The SY89837U distributes clock frequencies from 1kHz to ? Unique input termination and VT pin accepts DC- or 1.5GHz, guaranteed, over temperature and voltage. AC-coupled inputs (CML, PECL, LVDS) The differential input includes Micrel?s unique, 3-pin input ? 800mV LVPECL output swing termination architecture that allows customers to interface ? Power supply +2.5V ?5% or +3.3V ?10% to any differential signal (AC- or DC-coupled) as small as ? ?40?C to +85?C industrial temperature range 200mV without any level shifting or termination resistor networks in the signal path. The outputs are 800mV, 100k ? Available in 32-pin (5mm x 5mm) QFN package compatible LVPECL with fast rise/fall times guaranteed to be less than 200ps. The SY89837U operates from a +2.5V ?5% or +3.3V ?10% supply and is guaranteed over the full industrial temperature range of ?40?C to +85?C. The SY89837U is part of Micrel?s ? high-speed, Precision Edge product line. APPLICATIONS All support documentation can be found on Micrel?s web site at: www.micrel.com. ? Redundant clock distribution ? Fail-safe clock protection Precision Edge is a registered trademark of Micrel, Inc. Rev.: F Amendment: /0 M9999-060410 1 Issue Date: June 2010 hbwhelp@micrel.com or (408) 955-1690? Precision Edge PRECISION 1:8 LVPECL FANOUT SY89837U Micrel, Inc. ? Precision Edge BUFFER WITH 2:1 RUNT PULSE SY89837U ELIMINATOR INPUT MUX FEATURES ? Selects between two clocks, and provides 8 ? Precision Edge precision, low skew LVPECL output copies ? Guaranteed AC performance over temperature and DESCRIPTION supply voltage: ? Wide operating frequency: 1kHz to >1.5GHz The SY89837U is a low jitter, low skew, high-speed 1:8 ? <975ps in-to-out t pd fanout buffer with a unique, 2:1 differential input multiplexer ? <180ps t /t (MUX) optimized for clock redundant switchover applications. r f Unlike standard multiplexers, the SY89837U unique 2:1 runt ? <40ps output-to-output skew pulse eliminator (RPE) input MUX prevents any short cycles ? Unique input isolation design minimizes crosstalk or ?runt? pulses during switchover. In addition, a unique ? Ultra-low jitter design: fail-safe input protection prevents metastable conditions ? 150fs RMS phase jitter when the selected input clock fails to a static DC differential voltage (differential input voltage drops below 200mV). ? <0.7ps MUX crosstalk induced jitter rms The SY89837U distributes clock frequencies from 1kHz to ? Unique input termination and VT pin accepts DC- or 1.5GHz, guaranteed, over temperature and voltage. AC-coupled inputs (CML, PECL, LVDS) The differential input includes Micrel?s unique, 3-pin input ? 800mV LVPECL output swing termination architecture that allows customers to interface ? Power supply +2.5V ?5% or +3.3V ?10% to any differential signal (AC- or DC-coupled) as small as ? ?40?C to +85?C industrial temperature range 200mV without any level shifting or termination resistor networks in the signal path. The outputs are 800mV, 100k ? Available in 32-pin (5mm x 5mm) QFN package compatible LVPECL with fast rise/fall times guaranteed to be less than 200ps. The SY89837U operates from a +2.5V ?5% or +3.3V ?10% supply and is guaranteed over the full industrial temperature range of ?40?C to +85?C. The SY89837U is part of Micrel?s ? high-speed, Precision Edge product line. APPLICATIONS All support documentation can be found on Micrel?s web site at: www.micrel.com. ? Redundant clock distribution ? Fail-safe clock protection Precision Edge is a registered trademark of Micrel, Inc. Rev.: F Amendment: /0 M9999-060410 1 Issue Date: June 2010 hbwhelp@micrel.com or (408) 955-1690? Precision Edge SY89837U Micrel, Inc. TYPICAL APPLICATIONS CIRCUIT Figure 1. Simpli?ed Example Illustrating Runt Pulse Eliminator (RPE) Circuit When Primary Clock Fails TRUTH TABLE Inputs Outputs IN0 /IN0 IN1 /IN1 SEL Q /Q 0 1 X X 0 0 1 1 0 X X 0 1 0 X X 0 1 1 0 1 X X 1 0 1 1 0 M9999-060410 2 hbwhelp@micrel.com or (408) 955-1690? Precision Edge PRECISION 1:8 LVPECL FANOUT SY89837U Micrel, Inc. ? Precision Edge BUFFER WITH 2:1 RUNT PULSE SY89837U ELIMINATOR INPUT MUX FEATURES ? Selects between two clocks, and provides 8 ? Precision Edge precision, low skew LVPECL output copies ? Guaranteed AC performance over temperature and DESCRIPTION supply voltage: ? Wide operating frequency: 1kHz to >1.5GHz The SY89837U is a low jitter, low skew, high-speed 1:8 ? <975ps in-to-out t pd fanout buffer with a unique, 2:1 differential input multiplexer ? <180ps t /t (MUX) optimized for clock redundant switchover applications. r f Unlike standard multiplexers, the SY89837U unique 2:1 runt ? <40ps output-to-output skew pulse eliminator (RPE) input MUX prevents any short cycles ? Unique input isolation design minimizes crosstalk or ?runt? pulses during switchover. In addition, a unique ? Ultra-low jitter design: fail-safe input protection prevents metastable conditions ? 150fs RMS phase jitter when the selected input clock fails to a static DC differential voltage (differential input voltage drops below 200mV). ? <0.7ps MUX crosstalk induced jitter rms The SY89837U distributes clock frequencies from 1kHz to ? Unique input termination and VT pin accepts DC- or 1.5GHz, guaranteed, over temperature and voltage. AC-coupled inputs (CML, PECL, LVDS) The differential input includes Micrel?s unique, 3-pin input ? 800mV LVPECL output swing termination architecture that allows customers to interface ? Power supply +2.5V ?5% or +3.3V ?10% to any differential signal (AC- or DC-coupled) as small as ? ?40?C to +85?C industrial temperature range 200mV without any level shifting or termination resistor networks in the signal path. The outputs are 800mV, 100k ? Available in 32-pin (5mm x 5mm) QFN package compatible LVPECL with fast rise/fall times guaranteed to be less than 200ps. The SY89837U operates from a +2.5V ?5% or +3.3V ?10% supply and is guaranteed over the full industrial temperature range of ?40?C to +85?C. The SY89837U is part of Micrel?s ? high-speed, Precision Edge product line. APPLICATIONS All support documentation can be found on Micrel?s web site at: www.micrel.com. ? Redundant clock distribution ? Fail-safe clock protection Precision Edge is a registered trademark of Micrel, Inc. Rev.: F Amendment: /0 M9999-060410 1 Issue Date: June 2010 hbwhelp@micrel.com or (408) 955-1690? Precision Edge PRECISION 1:8 LVPECL FANOUT SY89837U Micrel, Inc. ? Precision Edge BUFFER WITH 2:1 RUNT PULSE SY89837U ELIMINATOR INPUT MUX FEATURES ? Selects between two clocks, and provides 8 ? Precision Edge precision, low skew LVPECL output copies ? Guaranteed AC performance over temperature and DESCRIPTION supply voltage: ? Wide operating frequency: 1kHz to >1.5GHz The SY89837U is a low jitter, low skew, high-speed 1:8 ? <975ps in-to-out t pd fanout buffer with a unique, 2:1 differential input multiplexer ? <180ps t /t (MUX) optimized for clock redundant switchover applications. r f Unlike standard multiplexers, the SY89837U unique 2:1 runt ? <40ps output-to-output skew pulse eliminator (RPE) input MUX prevents any short cycles ? Unique input isolation design minimizes crosstalk or ?runt? pulses during switchover. In addition, a unique ? Ultra-low jitter design: fail-safe input protection prevents metastable conditions ? 150fs RMS phase jitter when the selected input clock fails to a static DC differential voltage (differential input voltage drops below 200mV). ? <0.7ps MUX crosstalk induced jitter rms The SY89837U distributes clock frequencies from 1kHz to ? Unique input termination and VT pin accepts DC- or 1.5GHz, guaranteed, over temperature and voltage. AC-coupled inputs (CML, PECL, LVDS) The differential input includes Micrel?s unique, 3-pin input ? 800mV LVPECL output swing termination architecture that allows customers to interface ? Power supply +2.5V ?5% or +3.3V ?10% to any differential signal (AC- or DC-coupled) as small as ? ?40?C to +85?C industrial temperature range 200mV without any level shifting or termination resistor networks in the signal path. The outputs are 800mV, 100k ? Available in 32-pin (5mm x 5mm) QFN package compatible LVPECL with fast rise/fall times guaranteed to be less than 200ps. The SY89837U operates from a +2.5V ?5% or +3.3V ?10% supply and is guaranteed over the full industrial temperature range of ?40?C to +85?C. The SY89837U is part of Micrel?s ? high-speed, Precision Edge product line. APPLICATIONS All support documentation can be found on Micrel?s web site at: www.micrel.com. ? Redundant clock distribution ? Fail-safe clock protection Precision Edge is a registered trademark of Micrel, Inc. Rev.: F Amendment: /0 M9999-060410 1 Issue Date: June 2010 hbwhelp@micrel.com or (408) 955-1690? Precision Edge SY89837U Micrel, Inc. TYPICAL APPLICATIONS CIRCUIT Figure 1. Simpli?ed Example Illustrating Runt Pulse Eliminator (RPE) Circuit When Primary Clock Fails TRUTH TABLE Inputs Outputs IN0 /IN0 IN1 /IN1 SEL Q /Q 0 1 X X 0 0 1 1 0 X X 0 1 0 X X 0 1 1 0 1 X X 1 0 1 1 0 M9999-060410 2 hbwhelp@micrel.com or (408) 955-1690? Precision Edge SY89837U Micrel, Inc. PACKAGE/ORDERING INFORMATION (1) Ordering Information Package Operating Package Lead Part Number Type Range Marking Finish SY89837UMG QFN-32 Industrial SY89837U with Pb-Free Pb-Free bar-line indicator NiduAu (2) SY89837UMGTR QFN-32 Industrial SY89837U with Pb-Free Pb-Free bar-line indicator NiduAu Notes: 1. Contact factory for die availability. Dice are guaranteed at T = 25?C, DC Electricals only. A 2. Tape and Reel. 32-Pin QFN PIN DESCRIPTION Pin Number Pin Name Pin Function 1, 3, IN0, /IN0, Differential Inputs: These input pairs are the differential signal inputs to the device. These inputs 6, 8 IN1, /IN1 accept AC- or DC-coupled signals as small as 200mV. Each pin of a pair internally terminates to a VT pin through 50?. Please refer to the ?Input Interface Applications? section for more details. 2, 7 VT0, VT1 Input Termination Center-Tap: Each side of the differential input pair terminates to a VT pin. The VT0 and VT1 pins provide a center-tap to a termination network for maximum interface ?exibility. See the ?Input Interface Applications? section for more details. 31 SEL This single-ended TTL/CMOS-compatible input selects the inputs to the multiplexer. This input is internally connected to a 25k? pull-up resistor and will default to a logic HIGH state if left open. 9, 19, 22, 32 VCC Positive power supply. Bypass with low ESR capacitors as close to the pins as possible. 30, 28, 26, 24, Q0 ? Q7, Differential Outputs: These LVPECL output pairs are the outputs of the device. They are a logic 18, 16, 14, 12, /Q0 ? /Q7 function of the IN0, IN1, and SEL inputs. Please refer to the truth table for details. Unused 29, 27, 25, 23, output pairs may be left open. 17, 15, 13, 11 20,21 GND, Ground. Ground and exposed pad to be tied together to most negative potential of chip. Exposed Pad 10 CAP Power-On Reset (POR) Initialization Capacitor. When using the multiplexer with RPE capability, this pin is tied to a capacitor to V . The purpose is to ensure the internal RPE logic starts up in CC a known state. If this pin is tied to V , the RPE function will be disabled and the multiplexer will CC function as a normal multiplexer. See ?Application? section for more details. The CAP pin should never be left open. 4,5 VREF-AC0 Reference Voltage: These outputs bias to V - 1.2V. They are used for AC-coupling inputs CC VREF-AC1 (IN,/IN). Connect VREF_AC directly to the VT pin. Bypass with 0.01?F low ESR capacitor to VCC. See "Input Interface Applications" section. Maximum sink/source current is ?1.5mA. M9999-060410 3 hbwhelp@micrel.com or (408) 955-1690

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