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參數資料
| 型號： | DM74AS257 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | 10-Bit Bus Transceiver With 3-State Outputs 24-SOIC -40 to 85 |
| 中文描述： | 三態(tài)四2線數據選擇1 /多路復用器 |
| 文件頁數： | 1/6頁 |
| 文件大?。?/td> | 60K |
| 代理商： | DM74AS257 |
2000 Fairchild Semiconductor Corporation
DS006107
www.fairchildsemi.com
September 1986
Revised March 2000
D
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
I
Switching specifications at 50 pF
I
Switching specifications guaranteed over full tempera-
ture and V
CC
range
I
Advanced oxide-isolated, ion-implanted Schottky TTL
process
I
Functionally and pin for pin compatible with Schottky,
low power Schottky, and advanced low power Schottky
TTL counterpart
I
Improved AC performance over Schottky, low power
Schottky, and advanced low power Schottky counter-
parts
I
3-STATE buffer-type output drive bus lines directly
I
Expand any data input point
I
Multiplex dual data buses
I
General four functions of two variables (one variable is
common)
I
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
DM74AS257M
DM74AS257N
DM74AS258M
DM74AS258N
Package Number
M16A
N16E
M16A
N16E
Package Description
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
INPUTS
OUTPUT Y
OUTPUT
SELECT
A
B
AS257
AS258
CONTROL
H
X
X
X
Z
Z
L
L
L
X
L
H
L
L
H
X
H
L
L
H
X
L
L
H
L
H
X
H
H
L
相關PDF資料 |
PDF描述 |
|---|---|
| DM74AS257M | 10-Bit Bus Transceiver With 3-State Outputs 24-SOIC -40 to 85 |
| DM74AS257N | 3-STATE Quad 1 of 2 Line Data Selector/Multiplexers |
| DM74AS258M | 10-Bit Bus Transceiver With 3-State Outputs 24-SOIC -40 to 85 |
| DM74AS258N | 10-Bit Bus Transceiver With 3-State Outputs 24-SOIC -40 to 85 |
| DM74AS257MX | 2-Input Digital Multiplexer |
相關代理商/技術參數 |
參數描述 |
|---|---|
| DM74AS257M | 功能描述:編碼器、解碼器、復用器和解復用器 3-STATE Qd Sel/Mult RoHS:否 制造商:Micrel 產品:Multiplexers 邏輯系列:CMOS 位數: 線路數量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| DM74AS257M_Q | 功能描述:編碼器、解碼器、復用器和解復用器 3-STATE Qd Sel/Mult RoHS:否 制造商:Micrel 產品:Multiplexers 邏輯系列:CMOS 位數: 線路數量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| DM74AS257MX | 功能描述:編碼器、解碼器、復用器和解復用器 3-STATE Qd Sel/Mult RoHS:否 制造商:Micrel 產品:Multiplexers 邏輯系列:CMOS 位數: 線路數量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| DM74AS257N | 功能描述:編碼器、解碼器、復用器和解復用器 3-STATE Qd Sel/Mult RoHS:否 制造商:Micrel 產品:Multiplexers 邏輯系列:CMOS 位數: 線路數量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| DM74AS257N_Q | 功能描述:編碼器、解碼器、復用器和解復用器 3-STATE Qd Sel/Mult RoHS:否 制造商:Micrel 產品:Multiplexers 邏輯系列:CMOS 位數: 線路數量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
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