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DM74S253 Datasheet(PDF) 1 Page - Fairchild Semiconductor

Part No. DM74S253
Description  Dual 3-STATE 1-of-4 Line Data Selector/Multiplexer
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
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DM74S253 Datasheet(HTML) 1 Page - Fairchild Semiconductor

   
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© 2000 Fairchild Semiconductor Corporation
DS006481
www.fairchildsemi.com
August 1986
Revised May 2000
DM74S253
Dual 3-STATE 1-of-4 Line Data Selector/Multiplexer
General Description
Each of these Schottky-clamped data selectors/multiplex-
ers contains inverters and drivers to supply fully comple-
mentary, on-chip, binary decoding data selection to the
AND-OR gates. Separate output control inputs are pro-
vided for each of the two four-line sections.
The 3-STATE outputs can interface directly with data lines
of bus-organized systems. With all but one of the common
outputs disabled (at a high impedance state), the low
impedance of the single enable output will drive the bus
line to a HIGH or LOW logic level.
Features
s 3-STATE version of S153 with same pin-out
s Schottky-diode-clamped transistors
s Permits multiplexing from N lines to 1 line
s Performs parallel-T-serial conversion
s Strobe/output control
s High fan-out totem-pole outputs
s Typical propagation delay
From data to output
6 ns
From select to output
12 ns
s Typical power dissipation 275 mW
Ordering Code:
Connection Diagram
Function Table
Address inputs A and B are common to both sections.
H
= HIGH Level
L
= LOW Level
X
= Don’t Care
Z
= High Impedance
Order Number
Package Number
Package Description
DM74S253N
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Select
Data Inputs
Output
Output
Inputs
Control
B
A
C0
C1
C2
C3
G
Y
X
XXX
XX
H
Z
LL
L
X
X
X
L
L
LL
H
X
X
X
L
H
LH
X
L
X
X
L
L
LH
X
H
X
X
L
H
HL
X
X
L
X
L
L
HL
X
X
H
X
L
H
HH
X
X
X
L
L
L
HH
X
X
X
H
L
H


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