CD4536BPWE4

Overview

The CD4536BPWE4 is a CMOS programmable timer manufactured by Texas Instruments, belonging to the CD4536B series. It features two independent timers: a low-frequency oscillator (LFO) and a high-frequency oscillator (HFO). The LFO supports RC or crystal clock sources with adjustable duty cycles, while the HFO utilizes an internal RC circuit. Key electrical parameters include a supply voltage range of 3 V to 18 V, maximum propagation delay of 8 µs, and output currents of 4 mA for both high and low states. The device operates within a temperature range of -55°C to +125°C and is housed in a 16-pin TSSOP package.

Feature Summary

• Dual oscillator architecture comprising a low-frequency oscillator (LFO) and a high-frequency oscillator (HFO).
• LFO supports external RC timing networks or 32.768 kHz crystal inputs with programmable duty cycle control.
• CMOS technology enabling low power consumption with a typical operating current of 300 µA at 10 V.
• Robust output drive capability with 4 mA sourcing and sinking current at 5 V supply.

Applications

• Real-time clock circuits utilizing the 32.768 kHz crystal input.
• Watchdog timer implementations requiring precise reset intervals.
• Pulse width modulation (PWM) signal generation using the dual oscillator configuration.
• Interval timing applications in industrial control systems.

Procurement Notes

Verify the E4 suffix indicates lead-free composition and environmental compliance per manufacturer specifications. Confirm the TSSOP-16 package dimensions against PCB footprint requirements. Ensure thermal management strategies account for the 500 mW power dissipation rating under maximum load conditions. Cross-reference the specific revision level with the latest datasheet to confirm pinout consistency.

Selection Notes

Select this component when dual independent timing functions are required within a single IC. The wide supply voltage range (3 V to 18 V) makes it suitable for various logic families. Consider the -55°C to +125°C operating temperature range for harsh environment applications. Compare propagation delay specifications if precise timing synchronization is critical for the system design.

Part Context

The CD4536B is part of the standard 4000-series CMOS logic family, known for compatibility with TTL levels at higher supply voltages. The 'E4' suffix typically denotes lead-free packaging and RoHS compliance updates from Texas Instruments. This variant shares functional compatibility with the base CD4536B model but adheres to specific environmental manufacturing standards.

Replacement Considerations

The CD4536BPWR serves as a reel-based alternative offering identical electrical characteristics and pinout. Verify that the tape-and-reel handling equipment matches the TSSOP-16 package specifications. No functional differences exist between the tube (PW) and reel (PWR) variants regarding performance.