TECHNICAL DATA

258

Presettable 4-Bit Binary UP/DOWN Counter

High-Performance Silicon-Gate CMOS

The IN74HC193 is identical in pinout to the LS/ALS193. The

device inputs are compatible with standard CMOS outputs; with pullup

resistors, they are compatible with LS/ALSTTL outputs.

The counter has two separate clock inputs, a Count Up Clock and

Count Down Clock inputs. The direction of counting is determined by

which input is clocked. The outputs change state synchronous with the

LOW-to-HIGH transitions on the clock inputs. This counter may be

preset by entering the desired data on the P0, P1, P2, P3 input. When

the Parallel Load input is taken low the data is loaded independently of

either clock input. This feature allows the counters to be used as

devide-by-n by modifying the count lenght with the preset inputs. In

addition the counter can also be cleared. This is accomplished by

inputting a high on the Master Reset input. All 4 internal stages are set

to low independently of either clock input.Both a Terminal Count

output produces a negative going pulse when the counter underflows

the Count Up Clock and Count Down Clock inputs, respectively, of the

next device.

• Outputs Directly Interface to CMOS, NMOS, and TTL

• Operating Voltage Range: 2.0 to 6.0 V

• Low Input Current: 1.0 µA

• High Noise Immunity Characteristic of CMOS Devices

IN74HC193

ORDERING INFORMATION

IN74HC193N Plastic

IN74HC193D SOIC

PIN ASSIGNMENT

LOGIC DIAGRAM

PIN 8 = GND