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| 型號(hào)： | DM74LS21J |
| 英文描述： | Dual 4-input AND Gate |
| 中文描述： | 雙4輸入與門 |
| 文件頁(yè)數(shù)： | 1/8頁(yè) |
| 文件大小： | 163K |
| 代理商： | DM74LS21J |
TL/F/6417
5
T
June 1989
54LS257A/DM54LS257B/DM74LS257B,
54LS258A/DM54LS258B/DM74LS258B
TRI-STATE
é
Quad 2-Data Selectors/Multiplexers
General Description
These Schottky-clamped high-performance multiplexers
feature TRI-STATE outputs that 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 enabled output will drive the
bus line to a high or low logic level. To minimize the possibil-
ity 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 out-
put enable times.
This TRI-STATE output feature means that n-bit (paralleled)
data selectors with up to 258 sources can be implemented
for data buses. It also permits the use of standard TTL reg-
isters for data retention throughout the system.
Features
Y
TRI-STATE versions LS157 and LS158 with same pin-
outs
Y
Schottky-clamped for significant improvement in A-C
performance
Y
Provides bus interface from multiple sources in high-
performance systems
Y
Average propagation delay from data input 12 ns
Y
Typical power dissipation
LS257B
LS258B
50 mW
35 mW
military/aerospace
Y
Alternate
54LS258A) are available. Contact a National Semicon-
ductor Sales Office/Distributor for specifications.
devices
(54LS257A/
Connection Diagrams
Dual-In-Line Package
TL/F/6417–1
Order Number 54LS257ADMQB, 54LS257AFMQB,
54LS257ALMQB, DM54LS257BJ, DM54LS257BW,
DM74LS257BM or DM74LS257BN
See NS Package Number E20A, J16A,
M16A, N16E or W16A
Dual-In-Line Package
TL/F/6417–2
Order Number 54LS258ADMQB, 54LS258AFMQB,
54LS258ALMQB, DM54LS258BJ, DM54LS258BW,
DM74LS258BM or DM74LS258BN
See NS Package Number E20A, J16A,
M16A, N16E or W16A
Function Table
Inputs
Output Y
Output
Control
Select
A
B
LS257
LS258
H
L
L
L
L
X
L
L
H
H
X
L
H
X
X
X
X
X
L
H
Z
L
H
L
H
Z
H
L
H
L
H
e
High Level, L
e
Low Level, X
e
Don’t Care,
Z
e
High Impedance (off)
TRI-STATE
é
is a registered trademark of National Semiconductor Corporation.
C
1995 National Semiconductor Corporation
RRD-B30M105/Printed in U. S. A.
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| DM74LS21M | 制造商:Texas Instruments 功能描述: |
| DM74LS21MX | 制造商:Texas Instruments 功能描述: |
| DM74LS221 WAF | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| DM74LS221M | 功能描述:單穩(wěn)態(tài)多諧振蕩器 Dl Non-Ret One-Shot RoHS:否 制造商:Texas Instruments 每芯片元件:1 邏輯系列:LVC 邏輯類型:Monostable Multivibrator 封裝 / 箱體:SSOP-8 傳播延遲時(shí)間:18.6 ns 高電平輸出電流:- 32 mA 低電平輸出電流:32 mA 電源電壓-最大:5.5 V 電源電壓-最小:1.65 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
| DM74LS221MX | 功能描述:單穩(wěn)態(tài)多諧振蕩器 Dl Non-Ret One-Shot RoHS:否 制造商:Texas Instruments 每芯片元件:1 邏輯系列:LVC 邏輯類型:Monostable Multivibrator 封裝 / 箱體:SSOP-8 傳播延遲時(shí)間:18.6 ns 高電平輸出電流:- 32 mA 低電平輸出電流:32 mA 電源電壓-最大:5.5 V 電源電壓-最小:1.65 V 最大功率耗散: 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝:Reel |
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