74LS669 Synchronous 4-Bit Up/Down Counter
A versatile 4-bit binary counter with synchronous operation and carry lookahead feature.
- Supply Voltage: 4.75 - 5.25V
- Operating Ambient Temperature Range: 70°C
- Output Current — High: –0.4mA
- Output Current — Low: 8.0mA
- Input HIGH Voltage: 2.0V
- Input LOW Voltage: 0.8V
- Input Clamp Diode Voltage: -0.65 - -1.5V
- Short Circuit Current: -100mA
- Power Supply Current: 34mA
- Package Includes: 1 X 74LS669 IC - (SMD Package) - Synchronous 4-Bit Up/Down Binary Counter IC (74669 IC)
Top Features:
- Programmable Look-Ahead Up/Down Binary/Decade Counters
- Fully Synchronous Operation for Counting and Programming
- Internal Look-Ahead for Fast Counting
- Carry Output for n-Bit Cascading
The 74LS669 is a synchronous 4-bit up/down counter with internal carry lookahead for cascading. It provides synchronous operation to eliminate output counting spikes. The counter features four master-slave flip-flops triggered on the rising edge of the clock waveform. The load inputs allow loading with the carry-enable output of cascaded counters, ensuring synchronous loading. The count-enable inputs (P and T) must both be low to count, and the up-down input determines the count direction.
The carry output produces low-level output pulses for cascading stages. The counter is fully independent with buffered outputs and simplifies system design by minimizing transmission line effects. The operating mode remains unaffected until clocking occurs due to independent clock circuits.
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