HEF4541BT,518

HEF4541B Programmable timer Rev. 6 25 November 2021 Product data sheet 1. General description The HEF4541B is a programmable timer. It consists of a 16-stage binary counter, an integrated oscillator to be used with external timing components, an automatic power-on reset and output control logic. The external components R and C determines the frequency of the oscillator TC TC within the frequency range 1 Hz to 100 kHz. An external clock signal at input RS can replace the oscillator. The timer advances on the positive-going transition of RS. A LOW on the auto reset input (AR) and a LOW on the master reset input (MR) enables the internal power-on reset. A HIGH level at input MR resets the counter independent on all other inputs. Resetting, disables the oscillator to provide no active power dissipation. A HIGH at input AR turns off the power-on reset to provide a low quiescent power dissipation of the 8 10 13 16 timer. The 16-stage counter divides the oscillator frequency by 2 , 2 , 2 or 2 depending on the state of the address inputs (A0, A1). The divided oscillator frequency is available at output O. The phase input (PH) features a complementary output signal. When the mode select input (MODE) is n LOW the timer is a single transition timer and when HIGH the timer is a 2 frequency divider. It operates over a recommended V power supply range of 3 V to 15 V referenced to V (usually DD SS ground). Unused inputs must be connected to V , V , or another input. DD SS 2. Features and benefits Wide supply voltage range from 3.0 V to 15.0 V CMOS low power dissipation High noise immunity Fully static operation 5 V, 10 V, and 15 V parametric ratings Standardized symmetrical output characteristics Complies with JEDEC standard JESD 13-B ESD protection: HBM JESD22-A114F exceeds 2000 V MM JESD22-A115-A exceeds 200 V Specified from -40 C to +85 C and from -40 C to +125 C 3. Ordering information Table 1. Ordering information Type number Package Temperature range Name Description Version HEF4541BT -40 C to +125 C SO14 plastic small outline package 14 leads SOT108-1 body width 3.9 mmNexperia HEF4541B Programmable timer 4. Functional diagram RS CTC RTC A0 A1 MODE 3 2 1 12 13 10 CONTROL INPUTS CP 8 OUTPUT 5 BINARY O AR STAGE POWER-ON COUNTER C D 6 RESET MR 9 PH 001aai581 Fig. 1. Functional diagram CTC RTC 8 2 COUNTER RS 8 CP 2 RESET 8 2 COUNTER CP 2 5 8 RESET 2 2 2 A0 MUX A1 POWER-ON AR LATCH RESET MR MODE PH O 001aai583 Fig. 2. Logic diagram HEF4541B All information provided in this document is subject to legal disclaimers. Nexperia B.V. 2021. All rights reserved Product data sheet Rev. 6 25 November 2021 2 / 14