Page 1
1-OF-10 DECODER/DRIVER
OPEN-COLLECTOR
The SN54/ 74LS145, 1-of-10 Decoder/Driver, is designed to accept BCD
inputs and provide appropriate outputs to drive 10-digit incandescent
displays. All outputs remain off for all invalid binary input conditions. It is
designed for use as indicator/relay drivers or as an open-collector logic circuit
driver. Each of the high breakdown output transistors will sink up to 80 mA of
current. Typical power dissipation is 35 mW. This device is fully compatible
with all TTL families.
• Low Power Version of 54/74145
• Input Clamp Diodes Limit High Speed Termination Effects
SN54/74LS145
1-OF-10 DECODER/DRIVER
OPEN-COLLECTOR
LOW POWER SCHOTTKY
CONNECTION DIAGRAM DIP (TOP VIEW)
V
P0P1P2P
CC
16 15
123456
Q
0
PIN NAMES LOADING (Note a)
P0, P1, P2, P
Q
to Q
0
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 15 U.L. for Commercial (74)
T emperature Ranges.
3
9
14 13 12 11 10 9
Q
1Q2Q3Q4Q5Q6
BCD Inputs
Outputs (Note b)
LOGIC DIAGRAM
P
0
3
INPUTS
P
1
Q
Q
8
9
7
HIGH
0.5 U.L.
Open Collector
P
2
Q
7
8
GND
P
3
LOW
0.25 U.L.
15 (7.5) U.L.
CERAMIC
16
1
16
1
16
1
CASE 620-09
N SUFFIX
CASE 648-08
D SUFFIX
CASE 751B-03
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXD SOIC
LOGIC SYMBOL
J SUFFIX
PLASTIC
SOIC
INPUT
INVERTERS
DECODE/DRIVER
GATES
01230123
Q
Q
Q
Q
Q
Q
Q
Q
0
1
2
3
4
5
6
OUTPUTS
Q
7
8
FAST AND LS TTL DAT A
5-1
Q
9
15 14 13 12
P0P1P2P
Q0Q1Q2Q3Q4Q6Q7Q8Q
123456791011
VCC = PIN 16
GND = PIN 8
3
Q
5
9
Page 2
SN54/74LS145
TRUTH TABLE
INPUTS OUTPUTS
P3P2P1P0Q0Q1Q2Q3Q4Q5Q6Q7Q8Q
L L L L L H H H H H H H H H
L LLHHLHHHHHHHH
LLHLHHLHHHHHHH
LLHHHHHLHHHHHH
LHLLHHHHLHHHHH
LHLHHHHHHLHHHH
LHHLHHHHHHLHHH
LHHHHHHHHHHLHH
HLLLHHHHHHHHLH
HLLHHHHHHHHHHL
HLHLHHHHHHHHHH
HLHHHHHHHHHHHH
HHLLHHHHHHHHHH
HHLHHHHHHHHHHH
HHHLHHHHHHHHHH
HHHHHHHHHHHHHH
H = HIGH Voltage Level
L = LOW Voltage Level
9
GUARANTEED OPERATING RANGES
Symbol Parameter Min Typ Max Unit
V
T
V
I
CC
A
OH
OL
Supply Voltage 54
74
Operating Ambient Temperature Range 54
74
Output Voltage — High 54, 74 15 V
Output Current — Low 54
74
4.5
4.75
–55
0
5.0
5.0
25
25
5.5
5.25
125
70
12
24
V
°C
mA
FAST AND LS TTL DATA
5-2
Page 3
SN54/74LS145
VILI
LOW Volt
V
pg
V
CC
V
CC
MIN
IIHI
HIGH C
t
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol Parameter
V
V
I
V
I
I
IH
IK
OH
OL
IL
CC
Input HIGH Voltage 2.0 V
nput
Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA
Output HIGH Current 54, 74 250 µA VCC = MIN, VOH = MAX
Output LOW Voltage
nput
Input LOW Current –0.4 mA VCC = MAX, VIN = 0.4 V
Power Supply Current 13 mA VCC = MAX, VIN = GND
age
urren
Min Typ Max
54 0.7
74 0.8
54, 74 0.25 0.4 V IOL = 12 mA
74 0.35 0.5 V IOL = 24 mA
54, 74 2.3 3.0 V IOL = 80 mA
0.1 mA VCC = MAX, VIN = 7.0 V
Unit Test Conditions
Guaranteed Input HIGH Voltage for
All Inputs
Guaranteed Input LOW Voltage for
All Inputs
20 µA VCC = MAX, VIN = 2.7 V
V
= V
MIN
=
VIN = VIL or V
per Truth Table
,
IH
AC CHARACTERISTICS (T
Symbol Parameter
t
PHL
t
PLH
Propagation Delay
Pn Input to Qn Output
V
V
IN
OUT
1.3 V
t
PHL
1.3 V
= 25°C)
A
1.3 V
Figure 1 Figure 2
t
PLH
1.3 V
AC WAVEFORMS
Limits
Min Typ Max
50
50
V
IN
V
OUT
1.3 V
Unit Test Conditions
1.3 V
VCC = 5.0 V
CL = 45 pF
t
PLH
ns
t
PHL
1.3 V 1.3 V
FAST AND LS TTL DATA
5-3
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