TLC556CDR

Overview

The TLC556CDR is a dual CMOS timer integrated circuit manufactured by Texas Instruments, belonging to the LinCMOS family. It integrates two independent 555-type timers within a single 14-pin SOIC package. The device operates on a supply voltage range of 2V to 15V and supports a maximum frequency of 2.1MHz. It features high output drive capability with a low-level output current of up to 100mA. Designed for surface-mount applications, it functions reliably across an operating temperature range of 0°C to +70°C.

Feature Summary

• Dual Timer Configuration: Contains two independent 555-type timers in one 14-SOIC package.
• High Drive Capability: Provides 100mA low-level output current suitable for direct load driving.
• Wide Supply Range: Operates efficiently from 2V to 15V power supplies.
• Surface Mount Design: Available in a compact 14-SOIC (0.154 inch width) package for automated assembly.

Applications

• DC-DC converters
• PWM control circuits
• Logic timing circuits
• Sequential timing events

Procurement Notes

Verify the suffix 'DR' confirms the tape-and-reel packaging format distinct from tube-packaged variants like 'CD'. Confirm the 'C' designation indicates the commercial temperature grade (0°C to +70°C). Ensure the component matches the 14-SOIC physical dimensions and pinout specifications provided in the official datasheet before integration into PCB designs.

Selection Notes

Select the TLC556CDR when dual timer functionality is required in a space-constrained surface-mount design. Compare against the ICM7556ISD+ if lower quiescent current is prioritized over drive strength. Verify that the 2.1MHz frequency limit and 100mA output current meet the specific application requirements compared to standard bipolar alternatives.

Part Context

This component is part of the TLC556 series, which represents the CMOS evolution of the classic NE556 dual timer. It offers significantly lower power consumption while maintaining compatibility with TTL logic levels. The 'CDR' variant specifically denotes the commercial grade version packaged in reels for high-volume surface-mount manufacturing processes.

Replacement Considerations

The ICM7556ISD+ serves as a functional substitute offering similar dual-timer capabilities in a 14-SOIC package. Note that the ICM7556 operates at a lower maximum frequency of 500kHz but provides lower supply current. Pinouts are generally compatible, but electrical characteristics differ regarding speed and drive capacity.