5-240
FAST AND LS TTL DATA
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
CONNECTION DIAGRAM DIP (TOP VIEW)
PIN NAMES LOADING (Note a)
HIGH LOW
P0, P1, P2, P3
Q0 to Q9BCD Inputs
Outputs (Note b) 0.5 U.L.
Open Collector 0.25 U.L.
15 (7.5) U.L.
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)
Temperature Ranges.
LOGIC DIAGRAM
SN54/74LS145
1-OF-10 DECODER/DRIVER
OPEN-COLLECTOR
LOW POWER SCHOTTKY
J SUFFIX
CERAMIC
CASE 620-09
N SUFFIX
PLASTIC
CASE 648-08
16 1
16
1
ORDERING INFORMATION
SN54LSXXXJ Ceramic
SN74LSXXXN Plastic
SN74LSXXXD SOIC
16 1
D SUFFIX
SOIC
CASE 751B-03
LOGIC SYMBOL
5-241
FAST AND LS TTL DATA
SN54/74LS145
TRUTH TABLE
INPUTS OUTPUTS
P3P2P1P0Q0Q1Q2Q3Q4Q5Q6Q7Q8Q9
L L L L L H H H H H H H H H
LLLHHLHHHHHHHH
L L H L H H L H H H H H H H
LLHHHHHLHHHHHH
L H L L H H H H L H H H H H
L H L H H H H H H L H H H H
L H H L H H H H H H L H H H
LHHHHHHHHHHLHH
H L L L H H H H H H H H L H
HLLHHHHHHHHHHL
HLHLHHHHHHHHHH
HLHHHHHHHHHHHH
HHLLHHHHHHHHHH
HHLHHHHHHHHHHH
HHHLHHHHHHHHHH
HHHHHHHHHHHHHH
H = HIGH Voltage Level
L = LOW Voltage Level
GUARANTEED OPERATING RANGES
Symbol Parameter Min Typ Max Unit
VCC Supply Voltage 54
74 4.5
4.75 5.0
5.0 5.5
5.25 V
TAOperating Ambient Temperature Range 54
74 –55
025
25 125
70 °C
VOH Output Voltage — High 54, 74 15 V
IOL Output Current — Low 54
74 12
24 mA
5-242
FAST AND LS TTL DATA
SN54/74LS145
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Symbol
Parameter
Limits
Unit
Test Conditions
Symbol
Parameter
Min Typ Max
Unit
Test Conditions
VIH Input HIGH Voltage 2.0 V Guaranteed Input HIGH Voltage for
All Inputs
VIL
Input LOW Voltage
54 0.7
V
Guaranteed Input LOW Voltage for
All Inputs
VIL
Input LOW Voltage
74 0.8
V
Guaranteed Input LOW Voltage for
All Inputs
VIK Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA
IOH Output HIGH Current 54, 74 250 µA VCC = MIN, VOH = MAX
VOL
Output LOW Voltage
54, 74 0.25 0.4 V IOL = 12 mA
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
VOL Output LOW Voltage
74 0.35 0.5 V IOL = 24 mA
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
OL
54, 74 2.3 3.0 V IOL = 80 mA
IN = VIL or VIH
per Truth Table
IIH
Input HIGH Current
20 µA VCC = MAX, VIN = 2.7 V
IIH
Input HIGH Current
0.1 mA VCC = MAX, VIN = 7.0 V
IIL Input LOW Current –0.4 mA VCC = MAX, VIN = 0.4 V
ICC Power Supply Current 13 mA VCC = MAX, VIN = GND
AC CHARACTERISTICS (TA = 25°C)
Symbol
Parameter
Limits
Unit
Test Conditions
Symbol
Parameter
Min Typ Max
Unit
Test Conditions
tPHL
tPLH Propagation Delay
Pn Input to Qn Output 50
50 ns VCC = 5.0 V
CL = 45 pF
AC WAVEFORMS
Figure 1 Figure 2
5-243
FAST AND LS TTL DATA
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5-244
FAST AND LS TTL DATA
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