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DM74AS257M bảng dữ liệu(PDF) 1 Page - Fairchild Semiconductor

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Giải thích chi tiết về linh kiện  3-STATE Quad 1 of 2 Line Data Selector/Multiplexers
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© 2000 Fairchild Semiconductor Corporation
DS006107
www.fairchildsemi.com
September 1986
Revised March 2000
DM74AS257 • DM74AS258
3-STATE Quad 1 of 2 Line Data Selector/Multiplexers
General Description
These data selectors/multiplexers contain inverters and
drivers to supply full on-chip data selection to the four 3-
STATE outputs that can interface directly with data lines of
bus-organized systems. A 4-bit word selected from one of
two sources is routed to the four outputs. The DM74AS257
presents true data whereas the DM74AS258 presents
inverted data to minimize propagation delay time.
This 3-STATE output feature means that n-bit (paralleled)
data selectors with up to 300 sources can be implemented
for data buses. It also permits the use of standard TTL reg-
isters for data retention throughout the system.
Features
s Switching specifications at 50 pF
s Switching specifications guaranteed over full tempera-
ture and VCC range
s Advanced oxide-isolated, ion-implanted Schottky TTL
process
s Functionally and pin for pin compatible with Schottky,
low power Schottky, and advanced low power Schottky
TTL counterpart
s Improved AC performance over Schottky, low power
Schottky, and advanced low power Schottky counter-
parts
s 3-STATE buffer-type output drive bus lines directly
s Expand any data input point
s Multiplex dual data buses
s General four functions of two variables (one variable is
common)
s Source programmable counters
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Function Table
H
= HIGH Level
L
= LOW Level
X
= Don't Care
Z
= High Impedance (OFF)
Order Number
Package Number
Package Description
DM74AS257M
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
DM74AS257N
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
DM74AS258M
M16A
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
DM74AS258N
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
INPUTS
OUTPUT Y
OUTPUT
SELECT
A
B
AS257
AS258
CONTROL
HX
X
X
Z
Z
LL
L
X
L
H
LL
H
X
H
L
LH
X
L
L
H
LH
X
H
H
L


Số phần tương tự - DM74AS257M

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
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Fairchild Semiconductor
DM74AS257M FAIRCHILD-DM74AS257M Datasheet
291Kb / 8P
   3-STATE Quad 1 of 2 Line Data Selector/Multiplexers
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Mô tả tương tự - DM74AS257M

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
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Fairchild Semiconductor
DM74AS257 FAIRCHILD-DM74AS257_07 Datasheet
291Kb / 8P
   3-STATE Quad 1 of 2 Line Data Selector/Multiplexers
DM74ALS257 FAIRCHILD-DM74ALS257 Datasheet
74Kb / 7P
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DM74S257 FAIRCHILD-DM74S257 Datasheet
47Kb / 5P
   3-STATE Quad 1-of-2 Data Selector/Multiplexer
logo
National Semiconductor ...
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DM74ALS157 FAIRCHILD-DM74ALS157 Datasheet
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DM74AS157 FAIRCHILD-DM74AS157 Datasheet
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National Semiconductor ...
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Fairchild Semiconductor
DM74ALS251N FAIRCHILD-DM74ALS251N Datasheet
80Kb / 7P
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DM74ALS251 FAIRCHILD-DM74ALS251 Datasheet
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