74LS640 Datasheet, PDF (3/3 Pages) Motorola, Inc – OCTAL BUS TRANSCEIVERS

SN54/74LS641 • SN54/74LS642
GUARANTEED OPERATING RANGES
Symbol
Parameter
VCC
Supply Voltage
TA
Operating Ambient Temperature Range
VOH
IOL
Output Current — High
Output Current — Low
Min
Typ
Max
Unit
54
4.5
5.0
5.5
V
74
4.75
5.0
5.25
54
– 55
25
125
°C
74
0
25
70
54, 74
5.5
V
54
12
mA
74
24
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol
Parameter
Min Typ Max Unit
Test Conditions
VIH
Input HIGH Voltage
Guaranteed Input HIGH Voltage for
2.0
V _{All Inputs}
54
VIL
Input LOW Voltage
74
0.5
Guaranteed Input LOW Voltage for
0.6
V _{All Inputs}
VIK
IOH
VOL
Input Clamp Diode Voltage
Output HIGH Current
Output LOW Voltage
54, 74
54, 74
74
– 0.65
0.25
0.35
– 1.5
100
0.4
0.5
V VCC = MIN, IIN = – 18 mA
µA VCC = MIN, VOH = MAX
V IOL = 12 mA
V IOL = 24 mA
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
IIH
Input HIGH Current
IIL
Input LOW Current
Power Supply Current
Total, Output HIGH
ICC
Total, Output LOW
20
–0.1
– 0.4
µA VCC = MAX, VIN = 2.7 V
mA VCC = MAX, VIN = 7.0 V
mA VCC = MAX, VIN = 0.4 V
70
90
mA VCC = MAX
Total at HIGH Z
95
AC CHARACTERISTICS (TA = 25°C, VCC = 5.0 V)
Limits
LS641
LS642
Symbol
Parameter
Min Typ Max Min Typ Max Unit
tPLH
tPHL
Propagation Delay,
A to B
17 25
16 25
19
14
25
25
ns
tPLH
tPHL
Propagation Delay,
B to A
17 25
16 25
19
14
25
25
ns
tPLH
tPHL
Propagation Delay,
G, DIR to A
23 40
34 50
26
43
40
60
ns
tPLH
tPHL
Propagation Delay,
G, DIR to B
25 40
37 50
28
39
40
60
ns
Test Conditions
CL = 45 pF,
RL = 667 Ω
FAST AND LS TTL DATA
5-3