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SN74LS145
1-of-10 Decoder/Driver
Open-Collector
The SN74LS145, 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 74145
Input Clamp Diodes Limit High Speed Termination Effects
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min Typ Max Unit
VCC Supply Voltage
TA Operating Ambient
Temperature Range
4.75 5.0 5.25
V
0 25 70 °C
VOH Output Voltage – High
IOL Output Current – Low
15 V
24 mA
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LOW
POWER
SCHOTTKY
16
1
PLASTIC
N SUFFIX
CASE 648
16
1
SOIC
D SUFFIX
CASE 751B
ORDERING INFORMATION
Device
Package
Shipping
SN74LS145N 16 Pin DIP 2000 Units/Box
SN74LS145D
16 Pin
2500/Tape & Reel
© Semiconductor Components Industries, LLC, 1999
December, 1999 – Rev. 6
1
Publication Order Number:
SN74LS145/D

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SN74LS145
CONNECTION DIAGRAM DIP (TOP VIEW)
VCC P0 P1 P2 P3 Q9 Q8 Q7
16 15 14 13 12 11 10 9
1 2 3 4 56 78
Q0 Q1 Q2 Q3 Q4 Q5 Q6 GND
PIN NAMES
P0, P1, P2, P3
Q0 – Q9
BCD Inputs
Outputs
LOADING (Note a)
HIGH
LOW
0.5 U.L.
0.25 U.L.
Open Collector 15 U.L.
NOTES:
a) 1 TTL Unit Load (U.L.) = 40 mA HIGH/1.6 mA LOW.
LOGIC SYMBOL
15 14 13 12
P0 P1 P2 P3
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9
1 2 3 4 5 6 7 9 10 11
VCC = PIN 16
GND = PIN 8
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SN74LS145
LOGIC DIAGRAM
INPUTS
P0 P1 P2 P3
INPUT
INVERTERS
0
0
1 1 22 33
DECODE/DRIVER
GATES
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9
OUTPUTS
TRUTH TABLE
INPUTS
OUTPUTS
P3 P2 P1 P0 Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9
L L L L LHHHHHHHHH
L L LHHLHHHHHHHH
L LHLHHLHHHHHHH
L LHHHHHLHHHHHH
LHL LHHHHLHHHHH
L H L HHHHHH L HHHH
L HH L HHHHHH L HHH
L HHHHHHHHHH L HH
HL L LHHHHHHHHLH
HL LHHHHHHHHHHL
H L H L HHHHHHHHHH
H L HHHHHHHHHHHH
HHL LHHHHHHHHHH
HH L HHHHHHHHHHH
HHH L HHHHHHHHHH
HHHHHHHHHHHHHH
H = HIGH Voltage Level
L = LOW Voltage Level
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SN74LS145
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Symbol
Parameter
Limits
Min Typ Max
Unit
Test Conditions
VIH Input HIGH Voltage
2.0
Guaranteed Input HIGH Voltage for
V All Inputs
VIL Input LOW Voltage
0.8
V
Guaranteed Input LOW Voltage for
All Inputs
VIK Input Clamp Diode Voltage
IOH Output HIGH Current
VOL Output LOW Voltage
IIH Input HIGH Current
IIL Input LOW Current
ICC Power Supply Current
– 0.65 – 1.5 V VCC = MIN, IIN = – 18 mA
250 µA VCC = MIN, VOH = MAX
0.25 0.4
0.35 0.5
2.3 3.0
V IOL = 12 mA
V IOL = 24 mA
V IOL = 80 mA
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
20 µA VCC = MAX, VIN = 2.7 V
0.1 mA VCC = MAX, VIN = 7.0 V
– 0.4 mA VCC = MAX, VIN = 0.4 V
13 mA VCC = MAX, VIN = GND
AC CHARACTERISTICS (TA = 25°C)
Symbol
tPHL
tPLH
Parameter
Propagation Delay
Pn Input to Qn Output
Limits
Min Typ Max
50
50
Unit
ns
Test Conditions
VCC = 5.0 V
CL = 45 pF
AC WAVEFORMS
VIN
VOUT
1.3 V
tPHL
1.3 V
1.3 V
tPLH
1.3 V
VIN
VOUT
1.3 V
tPHL
1.3 V
1.3 V
tPLH
1.3 V
Figure 1.
Figure 2.
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SN74LS145
PACKAGE DIMENSIONS
–A–
16
1
H
G
N SUFFIX
PLASTIC PACKAGE
CASE 648–08
ISSUE R
9
B
8
FC
S
L
–T–
SEATING
PLANE
KJ
D 16 PL
0.25 (0.010) M T A M
M
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEADS WHEN
FORMED PARALLEL.
4. DIMENSION B DOES NOT INCLUDE MOLD FLASH.
5. ROUNDED CORNERS OPTIONAL.
INCHES
MILLIMETERS
DIM MIN MAX MIN MAX
A 0.740 0.770 18.80 19.55
B 0.250 0.270 6.35 6.85
C 0.145 0.175 3.69 4.44
D 0.015 0.021 0.39 0.53
F 0.040 0.70 1.02 1.77
G 0.100 BSC
2.54 BSC
H 0.050 BSC
1.27 BSC
J 0.008 0.015 0.21 0.38
K 0.110 0.130 2.80 3.30
L 0.295 0.305 7.50 7.74
M 0_ 10_ 0_ 10 _
S 0.020 0.040 0.51 1.01
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