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
