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SN54LV393A Datasheet(PDF) 2 Page - Texas Instruments

Part No. SN54LV393A
Description  DUAL 4-BIT BINARY COUNTERS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

SN54LV393A Datasheet(HTML) 2 Page - Texas Instruments

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SN54LV393A, SN74LV393A
DUAL 4BIT BINARY COUNTERS
SCLS457D − FEBRUARY 2001 − REVISED APRIL 2005
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description/ordering informaton (continued)
These devices comprise two independent 4-bit binary counters, each having a clear (CLR) and a clock (CLK)
input. These devices change state on the negative-going transition of the CLK pulse. N-bit binary counters can
be implemented with each package, providing the capability of divide by 256. The ’LV393A devices have parallel
outputs from each counter stage so that any submultiple of the input count frequency is available for system
timing signals.
These devices are fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the
outputs, preventing damaging current backflow through the devices when they are powered down.
FUNCTION TABLE
INPUTS
FUNCTION
CLK
CLR
FUNCTION
L
No change
L
Advance to next stage
X
H
All outputs L
logic diagram, each counter (positive logic)
R
T
QA
CLR
CLK
R
T
QB
R
T
QC
R
T
QD
Q
Q
Q
Q


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