DESCRIPTION
OF ”B” SERIES CMOS DEVICES” EY (Plastic Package) F (Ceramic Frit Seal Package) M1 (Micro Package) C1 (Plastic Chip Carrier) ORDER CODES : HCC40XXBF HCF40XXBM1 HCF40XXBEY HCF40XXBC1 DESCRIPTION
Inputs include a CLOCK, a RESET, and a CLOCK INHIBIT signal. Schmitt trigger action in the CLOCK input circuit provides pulse shaping that allows unlimited clock input pulse rise and fall times. These counters are advanced one count at the positive clock signal transition if the CLOCK INHIBIT signal is low. Counter advancement via the clock line is inhibited when the CLOCK INHIBIT signal is high. A high RESET signal clears the counter to its zero count. Use of the Johnson decade-counter configuration permits high-speed operation, 2-input decimal-decode gating, and spike-free decoded outputs. Anti-lock gating is provided, thus assuring proper counting sequence. The decoded outputs are normally low and go high only at their respective decoded time slot. Each decoded output remains high for one full clock cycle.
STMicroelectronics
