CD4541BEE4

Overview

The CD4541BEE4 is a CMOS programmable timer manufactured by Texas Instruments, housed in a 14-pin PDIP package. It integrates a 16-stage binary counter, an RC oscillator, and automatic power-on reset logic. The device operates within a supply voltage range of 3V to 20V and supports a temperature range of -55°C to 125°C. Timing is controlled via external R-C components or an external clock input on Pin 3. The output frequency is selectable from the 8th, 10th, 13th, or 16th counter stage using time-select inputs A and B.

Feature Summary

• Built-in low-power RC oscillator with frequency range from DC to 100kHz
• Configurable as a 2^N frequency divider or single-transition timer via MODE input
• Automatic power-on reset circuit for reliable initialization
• Q/Q select pin provides flexible output logic level options

Applications

• Digital timing circuits requiring precise pulse generation
• Frequency division applications in clock distribution networks
• Single-shot timer implementations for event triggering
• Industrial control systems operating in extreme temperature environments

Procurement Notes

Verify that the ordering suffix 'E4' corresponds to lead-free packaging and RoHS compliance as specified in the manufacturer's documentation. Confirm the package type matches the required PCB footprint, specifically the 14-lead PDIP configuration. Ensure the component status is listed as active production before finalizing procurement plans.

Selection Notes

Select this component when a high-voltage rated CMOS timer with integrated oscillator capabilities is required. The CD4541BEE4 is suitable for designs needing operation up to 20V and wide temperature tolerance. Consider the internal oscillator limitations if higher precision or frequencies beyond 100kHz are necessary; an external clock source can be utilized instead.

Part Context

The CD4541BEE4 belongs to the CD4541B family of CMOS programmable timers. It is functionally equivalent to the standard CD4541BE but includes specific environmental and material designations indicated by the 'E4' suffix. This part is part of the broader CD4000 series of CMOS logic devices produced by Texas Instruments.

Replacement Considerations

Direct replacements include the CD4541BE (PDIP) and CD4541BM (SOIC). Verify pinout compatibility and electrical specifications match the original design requirements before substitution.

FAQ

How is the oscillator frequency determined?

The oscillator frequency is determined by external resistor (RTC) and capacitor (CTC) components connected to Pins 1 and 2, calculated using the formula f = 1 / (2.3 * RTC * CTC).

What is the function of the AUTO RESET input?

The AUTO RESET input (Pin 5) enables automatic power-on reset when set to logic '0'. Disabling it (logic '1') requires a manual MASTER RESET pulse to initialize counting.

Can the internal oscillator be bypassed?

Yes, an external clock signal can be applied directly to Pin 3 to bypass the internal RC oscillator.