Page 39 - EE2449_TTL_Datasheet

SN54/74LS156

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

V OH Output Voltage — High 54, 74 5.5 V
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
I OH Output HIGH Current 54, 74 100 mA V CC = MIN, V OH = MAX
54, 74 0.25 0.4 V I OL = 4.0 mA V CC = V CC MIN,
Output LOW Voltage
V O u tp u t LOW V oltage V
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
C

rrent
u
u
I I IH IH Input HIGH Current
Inp

HIGH
t
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 CC Power Supply Current 10 mA V CC = MAX
AC CHARACTERISTICS (T A = 25°C)
Limits
Symbol Parameter Min Typ Max Unit Test Conditions
t PLH Propagation Delay 25 40
ns Figure 1
t PHL Address, E a or E b to Output 34 51
V CC = 5.0 V
t PLH Propagation Delay 31 46 ns Figure 2 C L = 15 pF
t PHL Address to Output 34 51
R L 2.0 kW
R L = 2.0 kW
t PLH Propagation Delay 32 48 ns Figure 1
t PHL E a to Output 32 48
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
5-153
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