HEF4541BT,512

Programmable Timers And Oscillators Overview

The HEF4541BT,512 is a programmable timer from Nexperia, housed in an SO14 (SOT108-1) plastic package. It integrates a 16-stage binary counter, an RC oscillator, and output control logic. The device operates on a supply voltage of 3 V to 15 V. External components RTC and CTC set the oscillator frequency between 1 Hz and 100 kHz, or an external clock can be applied to input RS. The counter divides the frequency by 2^8, 2^10, 2^13, or 2^16 based on address inputs A0 and A1. Propagation delay ranges from 75 ns to 1150 ns depending on load capacitance and division ratio.

Programmable Timers And Oscillators Feature Summary

• CMOS low power dissipation with fully static operation
• Wide supply voltage range from 3.0 V to 15.0 V
• Integrated automatic power-on reset and master reset functionality
• ESD protection: HBM > 2000 V, CDM > 1000 V

Programmable Timers And Oscillators Applications

• Programmable timing circuits
• Frequency dividers
• Clock generation systems

Programmable Timers And Oscillators Procurement Notes

Verify the ordering suffix '512' against official Nexperia documentation to confirm specific packaging details such as reel size or tape width. Ensure the component meets the required temperature range of -40 °C to +125 °C for the intended application environment.

Programmable Timers And Oscillators Selection Notes

Select this component when a single-chip solution for programmable timing is required. Consider the maximum clock frequency limits (up to 36 MHz at 15 V) and the need for external timing components (RTC, CTC) to define the oscillation frequency. Ensure unused inputs are tied to VDD or VSS.

Programmable Timers And Oscillators Part Context

This part belongs to the HEF4541B series of programmable timers manufactured by Nexperia. It is designed for general-purpose timing applications requiring a stable, low-power CMOS solution with flexible frequency division options via address pins.

Programmable Timers And Oscillators Replacement Considerations

Check for direct cross-references within the HEF4541B family. Verify pin compatibility and electrical specifications if substituting with other manufacturers' 16-stage binary counters with integrated oscillators.

Programmable Timers And Oscillators FAQ

How is the oscillator frequency determined?

The frequency is determined by external resistor (RTC) and capacitor (CTC) values connected to pins 1 and 2, typically ranging from 1 Hz to 100 kHz.

What is the function of the MODE input?

When MODE is LOW, the timer operates in single transition mode. When HIGH, it functions as a 2^n frequency divider.

How does the auto reset work?

A LOW level on the AR input enables the internal power-on reset, which initializes the counter. This requires the supply voltage to exceed 8.5 V for proper initialization.