TECHNICAL DATA
IN74HC393A
Dual 4-Stage Binary Ripple Counter
High-Performance Silicon-Gate CMOS
The IN74HC393A is identical in pinout to the LS/ALS393. The
device inputs are compatible with standard CMOS outputs; with pullup
resistors, they are compatible with LS/ALSTTL outputs.
This device consists of two independent 4-bit binary ripple counters
with parallel outputs from each counter stage. A÷256 counter can be
obtained by cascading the two binary counters.
Internal flip-flops are triggered by high-to-low transitions of the clock
input. Reset for the counters is asynchronous and active-high. State
changes of the Q outputs do not occur simultaneously because of internal
ripple delays. Therefore, decoded output signals are subject to decoding
spikes and should not be used as clocks or as strobes except when gated
with the Clock of the IN74HC393A.
ORDERING INFORMATION
IN74HC393AN Plastic
IN74HC393AD SOIC
TA = -55° to 125° C for all packages
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Outputs Directly Interface to CMOS, NMOS, and TTL
Operating Voltage Range: 2.0 to 6.0 V
Low Input Current: 1.0 µA
PIN ASSIGNMENT
High Noise Immunity Characteristic of CMOS Devices
LOGIC DIAGRAM
FUNCTION TABLE
Inputs
Outputs
Clock
Reset
X
H
L
H
L
L
L
L
L
PIN 14 =VCC
PIN 7 = GND
No Change
No Change
No Change
Advance to
Next State
X = don’t care
Rev. 00
IKSEMICON [ IK SEMICON CO., LTD ]
