SN54HC4040, SN74HC4040 12ĆBIT ASYNCHRONOUS BINARY.
Texas Instruments
SNJ54HC4040FK - 12-BIT ASYNCHRONOUS BINARY COUNTERS
SN54HC4040, SN74HC4040 12ĆBIT ASYNCHRONOUS BINARY COUNTERS D Wide Operating Voltage Range of 2 V to 6 V D Outputs Can Drive Up To 10 LSTTL Loads D Lo.