TC7WH123FU/FK TOSHIBA CMOS DIGITAL INTEGRATED CIRCUIT SILICON MONOLITHIC TC7WH123FU, TC7WH123FK Monostable Multivibrator TC7WH123FU The TC7WH123 is high speed CMOS MONOSTABLE 2 MULTIVIBRATOR fabricated with silicon gate C MOS technology. There are two trigger inputs, A input (Negative edge), and B input (Positive edge). These inputs are valid for a slow rise/fall time signal (tr = tf = 1 s) as they are schmitt trigger inputs. This device may also be triggered by using CLR input (Positive edge). After triggering, the output stays in a MONOSTABLE state for a time period determined by the external resistor and capacitor (RX, CX). A low level at the CLR input breaks this state. TC7WH123FK Limits for CX and RX are: External capacitor, CX: No limit External resistor, RX: VCC = 2.0 V more than 5 k VCC 3.0 V more than 1 k An input protection circuit ensures that 0 to 7 V can be applied to the input pins without regard to the supply voltage. This device can be used to interface 5 V to 3 V systems and two supply systems such as battery back up. This circuit prevents device destruction due to mismatched supply and input voltages. Weight SSOP8-P-0.65 : 0.02 g (typ.) SSOP8-P-0.50A : 0.01 g (typ.) Features High speed: tpd = 8.1 ns (typ.) at VCC = 5 V Low power dissipation Standby state: ICC = 2 A (max) at Ta = 25C Active state : ICC = 650 A (max) at VCC = 4.5 V High noise immunity: VNIH = VNIL = 28% VCC (min) Power down protection is equipped with all inputs. Balanced propagation delays: tpLH tpHL Wide operating voltage range: VCC (opr) = 2 to 5.5 V Start of commercial production 1998-08 1 2017-06-06 TC7WH123FU/FK Marking Pin Assignment (top view) V R /C C Q CC X X X 8 7 6 5 SM8 US8 Type Name H 1 2 3 Lot No. W H 1 2 3 1 2 3 4 A B CLR GND Truth Table IEC Logic Symbol Inputs Outputs Note A B CLR Q H H Output Enable X L H L Inhibit H X H L Inhibit L H Output Enable L H Output Enable X X L L Reset X: Dont care Block Diagram Note: CX, RX, DX are external capacitor, resistor, and diode, respectively. Note: External clamping diode, DX The external capacitor is charged to VCC level in the wait state, i.e. when no trigger is applied. If the supply voltage is turned off, CX is discharges mainly through the internal (parasitic) diode. If CX is sufficiently large and VCC drops rapidly, there will be some possibility of damaging the IC through in rush current or latch-up. If the capacitance of the supply voltage filter is large enough and VCC drops slowly, the in rush current is automatically limited and damage to the IC is avoided. The maximum value of forward current through the parasitic diode is 20 mA. In the case of a large CX, the limit of fall time of the supply voltage is determined as follows: tf (VCC - 0.7) CX / 20 mA (tf is the time between the supply voltage turn off and the supply voltage reaching 0.4 VCC.) In the even a system does not satisfy the above condition, an external clamping diode (DX) is needed to protect the IC from rush current. 2 2017-06-06