SN74LS155N [ROCHESTER]
Decoder/Driver, LS Series, Inverted Output, TTL, PDIP16, PLASTIC, DIP-16;
| 型号： | SN74LS155N |
| 厂家： | 
Rochester Electronics |
| 描述： | Decoder/Driver, LS Series, Inverted Output, TTL, PDIP16, PLASTIC, DIP-16 驱动 光电二极管 输出元件 逻辑集成电路 |
| 文件： | 总5页 (文件大小：812K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SN74LS155
DUAL 1-OF-4 DECODERꢀ/
DEMULTIPLEXER
The SN54 / 74LS156 is a high speed Dual 1-of-4
Decoder/Demultiplexer. This device has two decoders with common
2-bit Address inputs and separate gated Enable inputs. Decoder “a”
has an Enable gate with one active HIGH and one active LOW input.
Decoder “b” has two active LOW Enable inputs. If the Enable
functions are satisfied, one output of each decoder will be LOW as
selected by the address inputs. The LS156 has open collector outputs
for wired-OR (DOT-AND) decoding and function generator
applications.
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DUAL 1-OF-4 DECODER/
DEMULTIPLEXER
LS156-OPEN-COLLECTOR
LOW POWER SCHOTTKY
The LS156 is fabricated with the Schottky barrier diode process for
high speed and are completely compatible with all Motorola TTL
families.
J SUFFIX
CERAMIC
CASE 620-09
• Schottky Process for High Speed
• Multifunction Capability
• Common Address Inputs
16
1
• True or Complement Data Demultiplexing
• Input Clamp Diodes Limit High Speed Termination Effects
• ESD > 3500 Volts
N SUFFIX
PLASTIC
CASE 648-08
16
1
CONNECTION DIAGRAM DIP (TOP VIEW)
V
E
E
A
O
O
O
O
0b
CC
b
b
0
3b
2b
1b
D SUFFIX
SOIC
CASE 751B-03
16
15
14
13
12
11
10
9
16
NOTE:
1
The Flatpak version
has the same pinouts (Connection
Diagram) as the Dual In-Line Pack-
age.
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXD SOIC
1
2
3
4
5
6
8
7
E
E
A
O
O
O
O
GND
a
a
1
3a
2a
1a
0a
LOGIC SYMBOL
1 2
13 3
14 15
PIN NAMES
LOADING (Note a)
HIGH
LOW
A , A
Address Inputs
Enable (Active LOW) Inputs
Enable (Active HIGH) Input
0.5 U.L.
0.5 U.L.
0.5 U.L.
10 U.L.
0.25 U.L.
0.25 U.L.
0.25 U.L.
0
1
b
E
E
A
A
A
A
E , E
0
1
0
1
a
DECODER a
DECODER b
E
a
O −O
0
Active LOW Outputs (Note b)
5 (2.5) U.L.
3
0
1
2
3
0
1
2
3
NOTES:
a) 1 TTL Unit Load (U.L.) = 40 μA HIGH/1.6 mA LOW.
b) The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial (74)
Temperature Ranges. The HIGH level drive for the LS156 must be established by an
external resistor.
7
6
5
4
9
10 11 12
V
= PIN 16
CC
GND = PIN 8
©
Semiconductor Components Industries, LLC, 2006
1
Publication Order Number:
June, 2006 − Rev. 7
SN74LS155/D
SN74LS155
SN54/74LS156
LOGIC DIAGRAM
E
E
A
A
E E
b b
a
a
0
1
1
2
13
3
14
15
V
= PIN 16
CC
GND = PIN 8
7
6
5
4
9
10
11
12
= PIN NUMBERS
O
O
O
O
O
O
O
O
0a
1a
2a
3a
0b
1b
2b
3b
FUNCTIONAL DESCRIPTION
The LS156 is a Dual 1-of-4 Decoder/Demultiplexer with
common Address inputs and separate gated Enable inputs.
When enabled, each decoder section accepts the binary
weighted Address inputs (A0, A1) and provides four mutually
exclusive active LOW outputs (O0−O3). If the Enable
requirements of each decoder are not met, all outputs of that
decoder are HIGH.
AND the minterm functions by tying outputs together. Any
number of terms can be wired-AND as shown below.
f = (E + A0 + A1) ⋅ (E + A0 + A1) ⋅ (E + A0 + A1) ⋅
(E + A0 + A1)
where E = Ea + Ea; E = Eb + Eb
E
E
Each decoder section has a 2-input enable gate. The
enable gate for Decoder “a” requires one active HIGH input
and one active LOW input (Ea•Ea). In demultiplexing
applications, Decoder “a” can accept either true or
complemented data by using the Ea or Ea inputs respectively.
The enable gate for Decoder “b” requires two active LOW
inputs (Eb•Eb). The LS155 or LS156 can be used as a 1-of-8
Decoder/Demultiplexer by tying Ea to Eb and relabeling the
common connection as (A2). The other Eb and Ea are
connected together to form the common enable.
A
A
O
O
O
O
0
1
0
1
O
O
O
0
1
2
3
0
1
2
A
A
E
A
E
A
0
1
0
1
A
A
E
E
A
A
0
1
0
1
A
A
E
E
A
A
O
0
1
0
1
3
The LS156 can be used to generate all four minterms of
two variables. These four minterms are useful in some
applications replacing multiple gate functions as shown in
Fig. a. The LS156 has the further advantage of being able to
A
A
Figure a
TRUTH TABLE
ADDRESS
ENABLE “a”
OUTPUT “a”
ENABLE “b”
OUTPUT “b”
A
0
A
1
E
E
O
O
O
O
E
E
O
O
O
O
3
a
a
0
1
2
3
b
b
0
1
2
X
X
L
X
H
H
H
H
H
X
H
H
H
H
X
L
H
L
X
L
L
H
H
X
H
H
H
H
H
L
L
L
L
H
L
H
H
H
H
H
L
H
H
H
H
H
L
H
H
H
H
L
X
L
L
L
L
H
L
L
L
L
H
L
H
H
H
H
H
L
H
H
H
H
H
L
H
H
H
H
L
H
H
H
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
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2
SN74LS155
SN54/74LS156
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min
Typ
Max
Unit
V
Supply Voltage
54
74
4.5
4.75
5.0
5.0
5.5
5.25
V
CC
T
A
Operating Ambient Temperature Range
54
74
−55
0
25
25
125
70
°C
V
Output Voltage — High
Output Current — Low
54, 74
5.5
V
OH
I
54
74
4.0
8.0
mA
OL
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Min
Typ
Max
Symbol
Parameter
Input HIGH Voltage
Unit
Test Conditions
Guaranteed Input HIGH Voltage for
All Inputs
V
2.0
V
IH
54
74
0.7
0.8
Guaranteed Input LOW Voltage for
All Inputs
V
V
Input LOW Voltage
V
IL
Input Clamp Diode Voltage
Output HIGH Current
−0.65
−1.5
100
0.4
V
μA
V
V
V
I
= MIN, I = −18 mA
IN
IK
CC
CC
I
54, 74
54, 74
74
= MIN, V
= MAX
OH
OH
V
V
= V MIN,
CC
= V or V
0.25
0.35
= 4.0 mA
= 8.0 mA
CC
OL
V
Output LOW Voltage
Input HIGH Current
OL
IN
IL IH
0.5
20
V
I
OL
per Truth Table
μA
mA
mA
mA
V
V
V
V
= MAX, V = 2.7 V
IN
CC
CC
CC
CC
I
IH
0.1
−0.4
10
= MAX, V = 7.0 V
IN
I
I
Input LOW Current
= MAX, V = 0.4 V
IL
IN
Power Supply Current
= MAX
CC
AC CHARACTERISTICS (T = 25°C)
A
Limits
Typ
Min
Max
Symbol
Parameter
Propagation Delay
Address, E or E to Output
Unit
Test Conditions
t
t
25
34
40
51
PLH
ns
Figure 1
Figure 2
Figure 1
PHL
a
b
V
= 5.0 V
CC
t
t
Propagation Delay
Address to Output
31
34
46
51
PLH
PHL
ns
ns
C = 15 pF
L
R = 2.0 kΩ
L
t
t
Propagation Delay
E to Output
a
32
32
48
48
PLH
PHL
AC WAVEFORMS
1.3 V
1.3 V
V
1.3 V
t
1.3 V
V
IN
IN
t
t
PLH
t
PHL
PHL
PLH
1.3 V
1.3 V
V
1.3 V
1.3 V
V
OUT
OUT
Figure 1
Figure 2
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3
SN74LS155
ON Semiconductor and
are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
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“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights
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SN74LS155/D
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