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SN54/74LS145 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
1-OF-10 DECODER / DRIVER OPEN-COLLECTOR
LOW POWER SCHOTTKY
CONNECTION DIAGRAM DIP (TOP VIEW)
VCC 16 P0 15 P1 14 P2 13 P3 12 Q9 11 Q8 10 Q7 9
16 1
J SUFFIX CERAMIC CASE 620-09
16
N SUFFIX PLASTIC CASE 648-08
1
1 Q0
2 Q1
3 Q2
4 Q3
5 Q4
6 Q5
7 Q6
8 GND
PIN NAMES P0, P1, P2, P3 Q0 to Q9 BCD Inputs Outputs (Note b)
LOADING (Note a) HIGH 0.5 U.L. Open Collector LOW 0.25 U.L. 15 (7.5) U.L.
16 1
D SUFFIX SOIC CASE 751B-03
NOTES: a) 1 TTL Unit Load (U.L.) = 40 A 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.
ORDERING INFORMATION
SN54LSXXXJ SN74LSXXXN SN74LSXXXD Ceramic Plastic SOIC
LOGIC DIAGRAM
P0
INPUTS P1 P2 P3
LOGIC SYMBOL
15 14 13 12 P0 P1 P2 P3
INPUT INVERTERS 0 0 1 1 2 2 3 3
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9
123456 DECODE/DRIVER GATES Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9
7 9 10 11
VCC = PIN 16 GND = PIN 8
OUTPUTS
FAST AND LS TTL DATA 5-1
SN54/74LS145
TRUTH TABLE
INPUTS P3 L L L L L L L L H H H H H H H H P2 L L L L H H H H L L L L H H H H P1 L L H H L L H H L L H H L L H H P0 L H L H L H L H L H L H L H L H Q0 L H H H H H H H H H H H H H H H Q1 H L H H H H H H H H H H H H H H Q2 H H L H H H H H H H H H H H H H Q3 H H H L H H H H H H H H H H H H OUTPUTS Q4 H H H H L H H H H H H H H H H H Q5 H H H H H L H H H H H H H H H H Q6 H H H H H H L H H H H H H H H H Q7 H H H H H H H L H H H H H H H H Q8 H H H H H H H H L H H H H H H H Q9 H H H H H H H H H L H H H H H H
H = HIGH Voltage Level L = LOW Voltage Level
GUARANTEED OPERATING RANGES
Symbol VCC TA VOH IOL Supply Voltage Operating Ambient Temperature Range Output Voltage -- High Output Current -- Low Parameter 54 74 54 74 54, 74 54 74 Min 4.5 4.75 - 55 0 Typ 5.0 5.0 25 25 Max 5.5 5.25 125 70 15 12 24 Unit V C V mA
FAST AND LS TTL DATA 5-2
SN54/74LS145
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits Symbol S bl VIH VIL VIK IOH VOL Parameter P Input HIGH Voltage Input LOW Voltage Input Clamp Diode Voltage Output HIGH Current 54, 74 54, 74 Output LOW V l O Voltage 74 54, 74 IIH IIL ICC Input HIGH Current Input LOW Current Power Supply Current 0.25 0.35 2.3 54 74 - 0.65 Min 2.0 0.7 0.8 - 1.5 250 0.4 0.5 3.0 20 0.1 - 0.4 13 V A V V V A mA mA mA Typ Max Unit Ui V V Test C di i T Conditions Guaranteed Input HIGH Voltage for All Inputs Guaranteed Input LOW Voltage for p g All Inputs VCC = MIN, IIN = - 18 mA VCC = MIN, VOH = MAX IOL = 12 mA IOL = 24 mA IOL = 80 mA VCC = VCC MIN, VIN = VIL or VIH per Truth Table T th T bl
VCC = MAX, VIN = 2.7 V VCC = MAX, VIN = 7.0 V VCC = MAX, VIN = 0.4 V VCC = MAX, VIN = GND
AC CHARACTERISTICS (TA = 25C)
Limits S bl Symbol tPHL tPLH Propagation Delay Pn Input to Qn Output P Parameter Min Typ Max 50 50 Ui Unit ns T Test C di i Conditions VCC = 5.0 V CL = 45 pF
AC WAVEFORMS
VIN
1.3 V tPHL
1.3 V tPLH 1.3 V
VIN
1.3 V tPHL
1.3 V tPLH 1.3 V
VOUT
1.3 V
VOUT
1.3 V
Figure 1
Figure 2
FAST AND LS TTL DATA 5-3

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