Page 34 - EE2449_TTL_Datasheet

SN54/74LS151

GUARANTEED OPERATING RANGES
Symbol Parameter Min Typ Max Unit
V CC Supply Voltage 54 4.5 5.0 5.5 V
74 4.75 5.0 5.25
T A Operating Ambient Temperature Range 54 –55 25 125 °C
74 0 25 70
I OH Output Current — High 54, 74 –0.4 mA
I OL Output Current — Low 54 4.0 mA
74 8.0
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol Parameter Min Typ Max Unit Test Conditions
Guaranteed Input HIGH Voltage for
V IH Input HIGH Voltage 2.0 V
All Inputs
54 0.7 Guaranteed Input LOW Voltage for
g
Input LOW Voltage
V Inp u t LOW V oltage V V
V ILIL
74 0.8 All Inputs
V IK Input Clamp Diode Voltage –0.65 –1.5 V V CC = MIN, I IN = –18 mA
54 2.5 3.5 V V CC = MIN, I OH = MAX, V IN = V IHCC , OH , IN
tp
u
O
u

V
oltage
t

HIGH
V Output HIGH Voltage IH
V OHOH
74 2.7 3.5 V or V IL per Truth Table
54, 74 0.25 0.4 V I OL = 4.0 mA V CC = V CC MIN,

u
t
V
oltage
LOW

u
O
tp
V OL
V IN IN = V IL or V IH
V OL Output LOW Voltage V V IL or V IH
74 0.35 0.5 V I OL = 8.0 mA per Truth Table
20 mA V CC = MAX, V IN = 2.7 V
I I IH IH Input HIGH Current
Input HIGH Current
0.1 mA V CC = MAX, V IN = 7.0 V
I IL Input LOW Current –0.4 mA V CC = MAX, V IN = 0.4 V
I OS Short Circuit Current (Note 1) –20 –100 mA V CC = MAX
I CC Power Supply Current 10 mA V CC = MAX
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS (T A = 25°C)
Limits
Symbol Parameter Min Typ Max Unit Test Conditions
t PLH Propagation Delay 27 43
ns
t PHL Select to Output Z 18 30
t PLH Propagation Delay 14 23
ns
t PHL Select to Output Z 20 32
t PLH Propagation Delay 26 42
ns
t PHL Enable to Output Z 20 32 V CC = 5.0 V
CC
t PLH Propagation Delay 15 24 C L = 15 pF
ns
t PHL Enable to Output Z 18 30
t PLH Propagation Delay 20 32
ns
t PHL Data to Output Z 16 26
t PLH Propagation Delay 13 21
ns
t PHL Data to Output Z 12 20
AC WAVEFORMS
V IN 1.3 V 1.3 V V IN 1.3 V 1.3 V
t PHL t PLH t PHL t PLH
V OUT 1.3 V 1.3 V V OUT 1.3 V 1.3 V
Figure 1 Figure 2
FAST AND LS TTL DATA
5-146
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