SN54F138 [TI]
3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS; 3线路至8线路解码器/多路解复用器
| 型号： | SN54F138 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS |
| 文件： | 总6页 (文件大小：90K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SN54F138, SN74F138
3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS
SDFS051B – MARCH 1987 – REVISED JULY 1996
SN54F138 . . . J PACKAGE
SN74F138 . . . D OR N PACKAGE
(TOP VIEW)
Designed Specifically for High-Speed
Memory Decoders and Data Transmission
Systems
Incorporates Three Enable Inputs to
Simplify Cascading and/or Data Reception
V
A
B
1
2
3
4
5
6
7
8
16
15
14
13
12
CC
Y0
Y1
Y2
Y3
Package Options Include Plastic
Small-Outline Packages, Ceramic Chip
Carriers, and Standard Plastic and Ceramic
300-mil DIPs
C
G2A
G2B
G1
11 Y4
10
9
Y5
Y6
Y7
description
GND
The ′F138 is designed to be used in
high-performance memory-decoding or data-
routing applications requiring very short
propagation delay times. In high-performance
memory systems, these decoders can be used to
minimize the effects of system decoding. When
employed with high-speed memories utilizing a
fast enable circuit, the delay times of this decoder
and the enable time of the memory are usually
less than the typical access time of the memory.
This means that the effective system delay
introduced by the decoder is negligible.
SN54F138 . . . FK PACKAGE
(TOP VIEW)
3
2
1
20 19
18
C
G2A
NC
4
5
6
7
8
Y1
Y2
NC
Y3
Y4
17
16
15
14
G2B
G1
9 10 11 12 13
The conditions at the binary-select inputs and the
three enable inputs select one of eight output
lines. Two active-low and one active-high enable
inputs reduce the need for external gates or
inverters when expanding. A 24-line decoder can
NC – No internal connection
be implemented without external inverters and a 32-line decoder requires only one inverter. An enable input can
be used as a data input for demultiplexing applications.
The SN54F138 is characterized for operation over the full military temperature range of –55°C to 125°C. The
SN74F138 is characterized for operation from 0°C to 70°C.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright 1996, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54F138, SN74F138
3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS
SDFS051B – MARCH 1987 – REVISED JULY 1996
FUNCTION TABLE
ENABLE INPUTS
SELECT INPUTS
OUTPUTS
G1
G2A
H
X
X
L
G2B
C
X
X
X
L
B
X
X
X
L
A
X
X
X
L
Y0
H
H
H
L
Y1
H
H
H
H
L
Y2
H
H
H
H
H
L
Y3
H
H
H
H
H
H
L
Y4
H
H
H
H
H
H
H
L
Y5
H
H
H
H
H
H
H
H
L
Y6
H
H
H
H
H
H
H
H
H
L
Y7
H
H
H
H
H
H
H
H
H
H
L
X
X
L
X
H
X
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
L
L
L
H
L
H
H
H
H
H
H
H
L
L
H
H
L
H
H
H
H
H
H
L
L
H
L
H
H
H
H
H
L
H
H
H
H
H
H
H
H
L
L
H
L
H
H
H
L
H
H
H
H
L
H
H
†
logic symbols (alternatives)
BIN/OCT
1
DMUX
15
14
13
12
11
10
9
15
14
13
12
11
10
9
1
2
3
0
1
2
3
4
5
6
7
Y0
0
1
2
3
4
5
6
7
Y0
Y1
Y2
Y3
Y4
Y5
Y6
Y7
A
B
C
1
2
4
A
B
C
0
2
2
3
0
7
Y1
Y2
Y3
Y4
Y5
Y6
Y7
G
&
&
6
4
6
4
G1
G2A
G2B
G1
G2A
G2B
EN
5
5
7
7
†
These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54F138, SN74F138
3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS
SDFS051B – MARCH 1987 – REVISED JULY 1996
logic diagram (positive logic)
15
Y0
1
A
14
Y1
2
3
Select
Inputs
B
C
13
Y2
12
Y3
Data
Outputs
11
Y4
10
Y5
6
9
G1
Y6
4
5
Enable
Inputs
7
G2A
G2B
Y7
Pin numbers shown are for the D, J, and N packages.
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54F138, SN74F138
3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS
SDFS051B – MARCH 1987 – REVISED JULY 1996
†
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to 7 V
CC
Input voltage range, V (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –1.2 V to 7 V
I
Input current range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –30 mA to 5 mA
Voltage range applied to any output in the high state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.5 V to V
CC
Current into any output in the low state . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 mA
Operating free-air temperature range: SN54F138 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55°C to 125°C
SN74F138 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65°C to 150°C
†
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: The input voltage ratings may be exceeded provided the input current ratings are observed.
recommended operating conditions
SN54F138
SN74F138
UNIT
MIN NOM
MAX
MIN NOM
MAX
V
V
V
Supply voltage
4.5
2
5
5.5
4.5
2
5
5.5
V
V
CC
IH
IL
High-level input voltage
Low-level input voltage
Input clamp current
0.8
–18
– 1
0.8
–18
– 1
20
V
I
I
I
mA
mA
mA
°C
IK
High-level output current
Low-level output current
Operating free-air temperature
OH
OL
20
T
A
–55
125
0
70
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
SN54F138
SN74F138
PARAMETER
TEST CONDITIONS
UNIT
V
‡
‡
MIN TYP
MAX
MIN TYP
MAX
V
V
V
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
V
CC
= 4.5 V,
= 4.5 V,
= 4.75 V,
= 4.5 V,
= 5.5 V,
= 5.5 V,
= 5.5 V,
= 5.5 V,
= 5.5 V,
I = –18 mA
I
–1.2
–1.2
IK
I
I
I
= – 1 mA
= – 1 mA
= 20 mA
2.5
3.4
0.3
2.5
2.7
3.4
0.3
OH
OH
OL
V
OH
OL
0.5
0.1
0.5
0.1
V
I
I
I
I
I
V = 7 V
I
mA
µA
I
V = 2.7 V
I
20
20
IH
V = 0.5 V
I
– 0.6
–150
20
– 0.6
–150
20
mA
mA
mA
IL
§
V
O
= 0
–60
–60
OS
CC
See Note 2
13
13
‡
§
All typical values are at V
= 5 V, T = 25°C.
A
CC
Not more than one output should be shorted at a time, and the duration of the short circuit should not exceed one second.
is measured with outputs enabled and open.
NOTE 2:
I
CC
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54F138, SN74F138
3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS
SDFS051B – MARCH 1987 – REVISED JULY 1996
switching characteristics (see Note 3)
V
C
R
= 5 V,
= 50 PF,
= 500 Ω,
= 25°C
V
C
R
= 4.5 V TO 5.5 V,
= 50 PF,
CC
L
L
CC
L
L
= 500 Ω,
FROM
(INPUT)
TO
(OUTPUT)
†
PARAMETER
UNIT
T
A
T
A
= MIN TO MAX
′F138
TYP
5.2
5.7
5
SN54F138
SN74F138
MIN
2.7
3.2
2.7
2.2
3.2
2.7
MAX
7.5
8
MIN
2.7
3.2
2.7
2.2
3.2
2.7
MAX
MIN
2.7
3.2
2.7
2.2
3.2
2.7
MAX
t
t
t
t
t
t
12
9.5
11
8.5
9
PLH
PHL
PLH
PHL
PLH
PHL
A, B, or C
ns
ns
ns
Y
Y
Y
7
8
G2A or G2B
G1
4.9
5.8
5.2
7
8
7.5
9
8
12.5
8.5
7.5
8.5
†
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
NOTE 3: Load circuits and waveforms are shown in Section 1.
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
IMPORTANT NOTICE
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any product or service without notice, and advise customers to obtain the latest version of relevant information
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subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those
pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
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safeguards must be provided by the customer to minimize inherent or procedural hazards.
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semiconductor products or services might be or are used. TI’s publication of information regarding any third
party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.
Copyright 1998, Texas Instruments Incorporated
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