74F579SC 8-Bit Bidirectional Binary Counter with 3-STATE Outputs
74F579SCQR 8-bit bidirectional binary counter with TRI-STATE outputs. Commercial grade device with burn-in.
74F579SCX Synchronous Up/Down Counter
74F579SJ 8-Bit Bidirectional Binary Counter with 3-STATE Outputs
74F579SJX Synchronous Up/Down Counter