Page 38 - EE2449_TTL_Datasheet

SN54/74LS155

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
V Inp u t LOW V oltage V V
Input LOW Voltage
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
Output HIGH Voltage
V O u tp u t HIGH V oltage OH IN 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
oltage

LOW

t
V
tp
O
V Output LOW Voltage V
u
V IN =V IL or V IHIN = V IL or V IH
V OLOL
74 0.35 0.5 V I OL = 8.0 mA per Truth Table
20 mA V CC = MAX, V IN = 2.7 V
rrent
u
C
u
Inp
I I IH IH Input HIGH Current
t
HIGH

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 10 15 ns Figure 1
t PHL Address, E a or E b to Output 19 30
t PLH Propagation Delay 17 26 ns Figure 2 V CC = 5.0 V
t PHL Address to Output 19 30 C L = 15 pF
t PLH Propagation Delay 18 27 ns Figure 1
t PHL E a to Output 18 27
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
5-152
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