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부품번호 | DM74LS258B 기능 |
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기능 | TRI-STATE Quad 2-Data Selectors/Multiplexers | ||
제조업체 | National Semiconductor | ||
로고 | |||
전체 8 페이지수
June 1989
54LS257A DM54LS257B DM74LS257B
54LS258A DM54LS258B DM74LS258B
TRI-STATE 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 50 mW
LS258B 35 mW
Y Alternate military aerospace devices (54LS257A
54LS258A) are available Contact a National Semicon-
ductor Sales Office Distributor for specifications
Connection Diagrams
Dual-In-Line Package
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
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
X XX Z
Z
L
L LX L
H
L
L HX H
L
L
H XL L
H
L
H XH H
L
H e High Level L e Low Level X e Don’t Care
Z e High Impedance (off)
TRI-STATE is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL F 6417
RRD-B30M105 Printed in U S A
’LS258B Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted) (Continued)
Symbol
Parameter
Conditions
Typ
Min
(Note 1)
IIL Low Level Input
Current
VCC e Max
VI e 0 4V
Select
Other
IOZH
Off-State Output Current
with High Level Output
Voltage Applied
VCC e Max VO e 2 7V
VIH e Min VIL e Max
IOZL
Off-State Output Current
with Low Level Output
Voltage Applied
VCC e Max VO e 0 4V
VIH e Min VIL e Max
IOS Short Circuit
Output Current
VCC e Max
(Note 2)
DM54
DM74
b20
b20
ICCH
Supply Current with
Outputs High
VCC e Max (Note 3)
41
ICCL
Supply Current with
Outputs Low
VCC e Max (Note 3)
9
ICCZ
Supply Current with
Outputs Disabled
VCC e Max (Note 3)
12
Note 1 All typicals are at VCC e 5V TA e 25 C
Note 2 Not more than one output should be shorted at a time and the duration should not exceed one second
Note 3 ICC is measured with all outputs open and all possible inputs grounded while achieving the stated output conditions
Max
b0 8
b0 4
20
b20
b100
b100
7
14
19
’LS258B Switching Characteristics
at VCC e 5V and TA e 25 C (See Section 1 for Test Waveforms and Output Load)
Symbol
Parameter
From (Input)
To (Output)
RL e 667X
CL e 45 pF
CL e 150 pF
Min Max Min Max
tPLH
Propagation Delay Time
Data to
18
27
Low to High Level Output
Output
tPHL
Propagation Delay Time
Data to
18
27
High to Low Level Output
Output
tPLH
Propagation Delay Time
Select to
Low to High Level Output
Output
28
35
tPHL
Propagation Delay Time
Select to
High to Low Level Output
Output
35
42
tPZH
Output Enable Time
to High Level Output
Output
Control to Y
15
27
tPZL Output Enable Time
to Low Level Output
Output
Control to Y
28
38
tPHZ
Output Disable Time from
High Level Output (Note 4)
Output
Control to Y
26
tPLZ Output Disable Time from
Low Level Output (Note 4)
Note 4 CL e 5 pF
Output
Control to Y
25
Units
mA
mA
mA
mA
mA
mA
mA
Units
ns
ns
ns
ns
ns
ns
ns
ns
4
4페이지 Physical Dimensions inches (millimeters) (Continued)
16-Lead Small Outline Molded Package (M)
Order Number DM74LS257BM or DM74LS258BM
NS Package Number M16A
16-Lead Molded Dual-In-Line Package (N)
Order Number DM74LS257BN or DM74LS258BN
NS Package Number N16E
7
7페이지 | |||
구 성 | 총 8 페이지수 | ||
다운로드 | [ DM74LS258B.PDF 데이터시트 ] |
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구매 문의 | 일반 IC 문의 : 샘플 및 소량 구매 ----------------------------------------------------------------------- IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한 광범위한 전력 반도체를 판매합니다. 전력 반도체 전문업체 상호 : 아이지 인터내셔날 사이트 방문 : [ 홈페이지 ] [ 블로그 1 ] [ 블로그 2 ] |
부품번호 | 상세설명 및 기능 | 제조사 |
DM74LS258 | (DM74LS257 / DM74LS258) TRI-STATE Quad 2-Data Selectors/Multiplexers | National Semiconductor |
DM74LS258B | TRI-STATE Quad 2-Data Selectors/Multiplexers | National Semiconductor |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |