MM58174AN

The MM58174AN from Texas Instruments is a low-threshold metal-gate CMOS circuit designed to function as a real-time clock and calendar in bus-oriented microprocessor systems. It includes an interrupt timer programmable to one of three times and maintains timekeeping down to 2.2V for low-power standby battery operation.

Key features include microprocessor compatibility, independent registers for tenths of seconds through tens of months, and automatic leap year calculation. The device also offers internal pull-ups for data safeguarding, protection against data changing during reads, and an independent interrupt system with an open-drain output. It is TTL compatible and operates with a low-cost internally biased oscillator.

This real-time clock is suitable for applications such as point-of-sale terminals, word processors, teller terminals, event recorders, microprocessor-controlled instrumentation, and TV/VCR reprogramming. It is available in a low-cost 16-pin dual-in-line package and supports commercial and military temperature ranges.

The MM58174AN operates with a supply voltage ranging from 2.2V in standby mode up to 5.5V in operational mode. It consumes a typical current of 10mA in standby and 1mA during operation. The device features TTL compatible input logic levels and output logic levels suitable for interfacing with microprocessors.