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DM74LS393 Schematic ( PDF Datasheet ) - Fairchild Semiconductor

Teilenummer DM74LS393
Beschreibung Dual 4-Bit Binary Counter
Hersteller Fairchild Semiconductor
Logo Fairchild Semiconductor Logo 




Gesamt 6 Seiten
DM74LS393 Datasheet, Funktion
August 1986
Revised March 2000
DM74LS393
Dual 4-Bit Binary Counter
General Description
Each of these monolithic circuits contains eight master-
slave flip-flops and additional gating to implement two indi-
vidual four-bit counters in a single package. The
DM74LS393 comprises two independent four-bit binary
counters each having a clear and a clock input. N-bit binary
counters can be implemented with each package providing
the capability of divide-by-256. The DM74LS393 has paral-
lel outputs from each counter stage so that any submultiple
of the input count frequency is available for system-timing
signals.
Features
s Dual version of the popular DM74LS93
s DM74LS393 dual 4-bit binary counter with individual
clocks
s Direct clear for each 4-bit counter
s Dual 4-bit versions can significantly improve system
densities by reducing counter package count by 50%
s Typical maximum count frequency 35 MHz
s Buffered outputs reduce possibility of collector commu-
tation
Ordering Code:
Order Number Package Number
Package Description
DM74LS393M
M14A
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow
DM74LS373N
N14A
14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Function Table
Counter Sequence (Each Counter)
Count
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
H = HIGH Logic Level
L = LOW Logic Level
QD
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
Outputs
QC QB
LL
LL
LH
LH
HL
HL
HH
HH
LL
LL
LH
LH
HL
HL
HH
HH
QA
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
© 2000 Fairchild Semiconductor Corporation DS006434
www.fairchildsemi.com






DM74LS393 Datasheet, Funktion
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Package Number N14A
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and
Fairchild reserves the right at any time without notice to change said circuitry and specifications.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provided in the labeling, can be rea-
sonably expected to result in a significant injury to the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be rea-
sonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
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