同步4位加/减十进制计数器。同步4位加/减二进制计数器 Synchronous 4-Bit Up/Down Decade Counter . Synchronous 4-Bit Up/Down Binary Counter
General Description
The CD40192BC and CD40193BC up/down counters are monolithic complementary MOS CMOS integrated circuits. The CD40192BC is a BCD counter, while the CD40193BC is a binary counter. Counting up and counting down is performed by two count inputs, one being held HIGH while the other is clocked. The outputs change on the positive-going transition of this clock.
Features
■Wide supply voltage range: 3V to 15V
■High noise immunity: 0.45 VDDtyp.
■Low power TTL compatibility: Fan out of 2 driving 74L or 1 driving 74LS
■Carry and borrow outputs for easy expansion to N-bit by cascading
■Asynchronous clear
■Equivalent to: MM74C192 and MM74C193