Nexperia HEF4541BT/S400518

The HEF4541B is a programmable timer which 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 frequency of the oscillator is determined by the external components R_TC and C_TC within the frequency range 1Hz to 100kHz. This oscillator may be replaced by an external clock signal at input RS, 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 timer. The 16 - stage counter divides the oscillator frequency by 2^8, 2^10, 2^13 or 2^16 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 LOW the timer is a single transition timer and when HIGH the timer is a z^n frequency divider. It operates over a recommended V_DD power supply range of 2V to 15V referenced to V_SS (usually ground). Unused inputs must be connected to V_DD, V_SS, or another input.

• Fully static operation
• 5 V, 10 V, and 15V parametric ratings
• Standardized symmetrical output characteristics
• Operates across the automotive temperature range - 40°C to + 85°C
• Complies with JEDEC standard JESD 13 - B