CD74HC161E Datasheet PDF - TI

●Description

●The ’HC161, ’HCT161, ’HC163, and ’HCT163 are presettable synchronous counters that feature look-ahead carry logic for use in high-speed counting applications. The ’HC161 and ’HCT161 are asynchronous reset decade and binary counters, respectively; the ’HC163 and ’HCT163 devices are decade and binary counters, respectively, that are reset synchronously with the clock. Counting and parallel presetting are both accomplished synchronously with the negative-to-positive transition of the clock.

●Features

●• ’HC161, ’HCT161 4-Bit Binary Counter, Asynchronous Reset

●• ’HC163, ’HCT163 4-Bit Binary Counter, Synchronous Reset

●• Synchronous Counting and Loading

●• Two Count Enable Inputs for n-Bit Cascading

●• Look-Ahead Carry for High-Speed Counting

●• Fanout (Over Temperature Range)

●   - Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads

●   - Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads

●• Wide Operating Temperature Range . . . -55oC to 125oC

●• Balanced Propagation Delay and Transition Times

●• Significant Power Reduction Compared to LSTTL Logic ICs

●• HC Types

●   - 2V to 6V Operation

●   - High Noise Immunity: NIL = 30%, NIH = 30% of VCC at VCC = 5V

●• HCT Types

●   - 4.5V to 5.5V Operation

●   - Direct LSTTL Input Logic Compatibility, VIL= 0.8V (Max), VIH = 2V (Min)

●   - CMOS Input Compatibility, Il ≤ 1µA at VOL, VOH