74VHC163

The 74VHC163 is an advanced high-speed CMOS device fabricated with silicon gate CMOS technology. It achieves the high-speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low power dissipation.

The 74VHC163 is a high-speed synchronous modulo-16 binary counter. This device is synchronously presettable for application in programmable dividers and has two types of Count Enable inputs plus a Terminal Count output for versatility in forming multistage counters. The CLK input is active on the rising edge. Both PE and MR inputs are active on low logic level. Presetting is synchronous to rising edge of CLK and the Clear function of the VHC163 is synchronous to CLK. Two enable inputs (ENP and ENT) and Carry Output are provided to enable easy cascading of counters, which facilitates easy implementation of n-bit counters without using external gates.

An input protection circuit of the 74VHC163 insures that 0V to 7V can be applied to the input pins without regard to the supply voltage.

This 74VHC163 can be used to interface 5V to 3V systems and two supply systems such as battery backup. This circuit prevents device destruction due to mismatched supply and input voltages.