74LS640 Datasheet, PDF (2/3 Pages) Motorola, Inc – OCTAL BUS TRANSCEIVERS

SN54/74LS640 • SN54/74LS645
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min
Typ
Max
Unit
VCC
Supply Voltage
54
4.5
5.0
5.5
V
74
4.75
5.0
5.25
TA
Operating Ambient Temperature Range
54
– 55
25
125
°C
74
0
25
70
IOH
Output Current — High
54, 74
54
74
– 3.0
mA
–12
mA
–15
IOL
Output Current — Low
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
2.0
V
Guaranteed Input HIGH Voltage for
All Inputs
VIL
VIK
VOH
VOL
IOZH
IOZL
IIH
IIL
IOS
ICC
Input LOW Voltage
Input Clamp Diode Voltage
Output HIGH Voltage
54
74
54, 74
54, 74
Output LOW Voltage
54, 74
74
Output Off Current HIGH
Output Off Current LOW
A or B, DIR or G
Input HIGH Current DIR or G
A or B
Input LOW Current
Output Short Circuit Current (Note 1)
Power Supply Current
Total Output HIGH
Total, Output LOW
0.5
0.6
– 0.65 – 1.5
2.4
3.4
2.0
0.25 0.4
0.35 0.5
20
– 400
20
0.1
0.1
– 0.4
– 40
– 225
70
90
V
Guaranteed Input LOW Voltage for
All Inputs
V VCC = MIN, IIN = – 18 mA
V VCC = MIN, IOH = 3.0 mA
V VCC = MIN, IOH = MAX
V IOL = 12 mA
V IOL = 24 mA
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
µA VCC = MAX, VOUT = 2.7 V
µA VCC = MAX, VOUT = 0.4 V
µA VCC = MAX, VIN = 2.7 V
mA VCC = MAX, VIN = 7.0 V
mA VCC = MAX, VIN = 5.5 V
mA VCC = MAX, VIN = 0.4 V
mA VCC = MAX
mA VCC = MAX
Total at HIGH Z
95
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS (TA = 25°C, VCC = 5.0 V)
Limits
LS640
LS645
Symbol
Parameter
Min Typ Max Min Typ Max Unit
Test Conditions
tPLH
tPHL
tPLH
tPHL
tPZL
tPZH
tPZL
tPZH
tPLZ
tPHZ
tPLZ
tPHZ
Propagation Delay
A to B
Propagation Delay
B to A
Output Enable Time
G, DIR to A
Output Enable Time
G, DIR to B
Output Disable Time
G, DIR to A
Output Disable Time
G, DIR to B
6.0 10
8.0 15
6.0 10
8.0 15
31 40
23 40
31 40
23 40
15 25
15 25
15 25
15 25
8.0
11
15
15
ns
8.0
11
15
15
ns
31 40
26
40
ns
31
26
40
40
ns
15 25
15
25
ns
15 25
15
25
ns
CL = 45 pF,
RL = 667 Ω
CL = 5.0 pF
FAST AND LS TTL DATA
5-2