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HD74LS257 Datasheet

Quadruple 2-line-to-1-line Data Selectors / Multiplexers

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HD74LS257
Quadruple 2-line-to-1-line Data Selectors / Multiplexers
(with not inverted 3-state outputs)
REJ03D0469–0300
Rev.3.00
Jul.15.2005
This multiplexer features three-state outputs that can interface directly with and drive 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
enabled output will drive the bus line to a high or low logic level.
To minimize the possibility that two outputs will attempt to take a common bus to opposite logic levels, the output-
enable circuitry is designed such that the output disable times are shorter than the output enable times.
Features
Ordering Information
Part Name
Package Type
Package Code
(Previous Code)
Package
Abbreviation
HD74LS257P
DILP-16 pin
PRDP0016AE-B
(DP-16FV)
P
HD74LS257FPEL SOP-16 pin (JEITA)
PRSP0016DH-B
(FP-16DAV)
FP
Note: Please consult the sales office for the above package availability.
Taping Abbreviation
(Quantity)
EL (2,000 pcs/reel)
Pin Arrangement
Select 1
1A 2
1B 3
1Y 4
2A 5
2B 6
2Y 7
GND 8
S
1A OC
1B 4A
1Y 4B
2A 4Y
2B 3A
2Y 3B
3Y
16 VCC
15 Output
Control
14 4A
13 4B
12 4Y
11 3A
10 3B
9 3Y
(Top view)
Rev.3.00, Jul.15.2005, page 1 of 5


Renesas Electronics Components Datasheet

HD74LS257 Datasheet

Quadruple 2-line-to-1-line Data Selectors / Multiplexers

No Preview Available !

HD74LS257
Function Table
Note:
Inputs
OC S A B
HXXX
LLLX
L LHX
L HX L
LHXH
H; high level, L; low level, X; irrelevant, Z; off (high-impedance) state of a 3-state output
Block Diagram
Output
Control
1A
1B
2A
2B
3A
3B
4A
4B
1Y
2Y
3Y
4Y
Output
Z
L
H
L
H
S
Absolute Maximum Ratings
Item
Symbol
Ratings
Supply voltage
VCC
7
Input voltage
VIN 7
Output voltage (off-state)
VO (off)
5.5
Operating temperature
Topr
–20 to +75
Power dissipation
PT 400
Storage temperature
Tstg –65 to +150
Note: Voltage value, unless otherwise noted, are with respect to network ground terminal.
Recommended Operating Conditions
Item
Supply voltage
Output current
Operating temperature
Symbol
VCC
IOH
IOL
Topr
Min
4.75
–20
Typ
5.00
25
Max
5.25
–2.6
8
75
Unit
V
V
V
°C
mW
°C
Unit
V
mA
mA
°C
Rev.3.00, Jul.15.2005, page 2 of 5


Part Number HD74LS257
Description Quadruple 2-line-to-1-line Data Selectors / Multiplexers
Maker Renesas
Total Page 6 Pages
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