SNJ54S169J

The SNJ54S169J is a synchronous, presettable, 4-bit binary up/down counter manufactured by Texas Instruments. It belongs to the 'S' technology family and is designed for military applications, operating within a temperature range of -55 to 125°C.

This counter features fully synchronous operation, meaning all flip-flops are clocked simultaneously, which helps to eliminate output counting spikes common in ripple-clock counters. It includes internal look-ahead circuitry for cascading counters in high-speed applications and provides a carry output for n-bit synchronous designs without additional gating. The device has a buffered clock input that triggers on the rising edge of the clock waveform.

Key operational features include fully independent clock circuitry and programmability, allowing outputs to be preset to any desired level. The load input circuitry enables synchronous loading, where a low level at the load input disables the counter and synchronizes the outputs with the data inputs after the next clock pulse. The direction of the count is controlled by the up/down input: high for counting up, low for counting down. The ENT\ input enables the carry output, which produces a low-level pulse.

The SNJ54S169J is packaged in a CDIP (J) package with a package area of 135.3552 mm². Its design facilitates cascading for n-bit synchronous applications, making it suitable for complex counting tasks.