TLC556MD

The TLC556MD from Texas Instruments is a dual CMOS timer IC, functionally interchangeable with the NE556, offering versatile timing and oscillation capabilities. It operates across a wide voltage range of 5V to 18V and supports frequencies up to 2.1MHz. This device boasts very low power consumption, typically 2mW at 5V, and features a CMOS output capable of swinging rail-to-rail with high output current capability (sink: 100mA typical, source: 10mA typical).

Designed for stability, the TLC556MD has a high input impedance, allowing for smaller timing capacitors compared to the NE556, which can result in more accurate time delays and oscillations. The trigger level is approximately one-third of the supply voltage, and the threshold level is approximately two-thirds, both adjustable via the control voltage pin. The reset input overrides all other inputs to initiate a new timing cycle.

This timer is available in a 14-SOIC package, suitable for surface mount applications. Its operating temperature range is -55°C to 125°C, making it suitable for various environmental conditions. The low supply current reduces spikes during output transitions, minimizing the need for large decoupling capacitors.