4位同步向上/向下计数器（双时钟有明确的） 4-BIT SYNCHRONOUS UP/DOWN COUNTER DUAL CLOCK WITH CLEAR
description/ordering information
The SN74HC193 device is a 4-bit synchronous, reversible, up/down binary counter. Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change simultaneously with each other when dictated by the steering logic. This mode of operation eliminates the output counting spikes normally associated with asynchronous ripple-clock counters.
• Qualified for Automotive Applications
• Wide Operating Voltage Range of 2 V to 6 V
• Outputs Can Drive Up To 10 LSTTL Loads
• Low Power Consumption, 80-µA Max ICC
• Typical tpd = 20 ns
• ±4-mA Output Drive at 5 V
• Low Input Current of 1 µA Max
• Look-Ahead Circuitry Enhances Cascaded Counters
• Fully Synchronous in Count Modes
• Parallel Asynchronous Load for Modulo-N Count Lengths
• Asynchronous Clear
