The SN54/74LS168 and SN54/74LS169 are fully synchronous 4-stage up/down counters featuring a preset capability for programmable operation,carry lookahead for easy cascading and a U/ D input to control the direction of counting. The SN54/74LS168 counts in a BCD decade (8, 4, 2, 1)sequence, while the SN54/74LS169 operates in a Modulo 16 binary sequence. All state changes, whether in counting or parallel loading, are initiated by the LOW-to-HIGH transition of the clock.
Features
Low Power Dissipation 100 mW Typical
High-Speed Count Frequency 30 MHz Typical
Fully Synchronous Operation
Full Carry Lookahead for Easy Cascading
Single Up/Down Control Input
Positive Edge-Trigger Operation
Input Clamp Diodes Limit High-Speed Termination Effects
Specification:
Maximum Supply Voltage:5.5V
Operating Ambient Temperature Range:0 to 70°C
