The KK74AC161 is identical in pinout to the LS/ALS161, HC/HCT161. The device inputs are compatible with standard CMOS outputs; with pullup resistors, they are compatible with LS/ALS outputs. The KK74AC161 is programmable 4-bit synchronous modulo-16 counter that feature parallel Load, asynchronous Reset, a Carry Output for cascading and count-enable controls. The KK74AC161 is binary counter with asynchronous Reset. Outputs Directly Interface to CMOS, NMOS, and TTL Operating Voltage Range: 2.0 to 6.0 V Low Input Current: 1.0 A; 0.1 A @ 25 C High Noise Immunity Characteristic of CMOS Devices Outputs Source/Sink 24 mA