TECHNICAL DATA
IN74HC393
Dual 4-Stage Binary Ripple Counter
High-Performance Silicon-Gate CMOS
The IN74HC393 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 becaue 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 IN74HC393.
ORDERING INFORMATION
IN74HC393N Plastic
IN74HC393D 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
386
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