Semiconductor Components Industries, LLC, 1999
December, 1999 – Rev. 6 1Publication Order Number:
SN74LS640/D
SN74LS640 SN74LS641
SN74LS642 SN74LS645
Octal Bus Transceivers
These octal bus transceivers are designed for asynchronous
two-way communication between data buses. Control function
implementation minimizes external timing requirements. These
circuits allow data transmission from the A bus to B or from the B bus
to A bus depending upon the logic level of the direction control (DIR)
input. Enable input (G) can disable the device so that the buses are
effectively isolated.
DEVICE OUTPUT LOGIC
LS640 3-State Inverting
LS641 Open-Collector True
LS642 Open-Collector Inverting
LS645 3-State True
FUNCTION TABLE
CONTROL
INPUTS
OPERATION
INPUTS
LS640
LS641
G DIR
LS640
LS642
LS641
LS645
L L B data to A bus B data to A bus
L H A data to B bus A data to B bus
H X Isolation Isolation
H = HIGH Level, L = LOW Level, X = Irrelevant
GUARANTEED OPERATING RANGES (SN74LS640, SN74LS645)
Symbol Parameter Min Typ Max Unit
VCC Supply Voltage 4.75 5.0 5.25 V
TAOperating Ambient
Temperature Range 0 25 70 °C
IOH Output Current – High –3.0 mA
–15 mA
IOL Output Current – Low 24 mA
GUARANTEED OPERATING RANGES (SN74LS641, SN74LS642)
Symbol Parameter Min Typ Max Unit
VCC Supply Voltage 4.75 5.0 5.25 V
TAOperating Ambient
Temperature Range 0 25 70 °C
VOH Output Voltage – High 5.5 V
IOL Output Current – Low 24 mA
LOW
POWER
SCHOTTKY
Device Package Shipping
ORDERING INFORMATION
SN74LS640N 16 Pin DIP 1440 Units/Box
SN74LS640DW 16 Pin
SOIC
DW SUFFIX
CASE 751D
http://onsemi.com
2500/Tape & Reel
PLASTIC
N SUFFIX
CASE 738
20
1
20
1
SN74LS641N 16 Pin DIP 1440 Units/Box
SN74LS641DW 16 Pin 2500/Tape & Reel
SN74LS642N 16 Pin DIP 1440 Units/Box
SN74LS642DW 16 Pin 2500/Tape & Reel
SN74LS645N 16 Pin DIP 1440 Units/Box
SN74LS645DW 16 Pin 2500/Tape & Reel
SN74LS640 SN74LS641 SN74LS642 SN74LS645
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2
CONNECTION DIAGRAMS DIP (TOP VIEW)
18 17 16 15 14 13
1234567
20 19
8
VCC
DIR
B1 B2 B3 B5B4 B6
A1 A2 A3 A4 A5 A6 A7 910
A8 GND
12 11
B7 B8
18 17 16 15 14 13
1234567
20 19
8
VCC
DIR
B1 B2 B3 B5B4 B6
A1 A2 A3 A4 A5 A6 A7 910
A8 GND
12 11
B7 B8
SN74LS640
SN74LS642 SN74LS641
SN74LS645
ENABLE
GENABLE
G
SN74LS640 SN74LS641 SN74LS642 SN74LS645
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3
SN74LS640 •SN74LS645
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol Parameter Min Typ Max Unit Test Conditions
VIH Input HIGH Voltage 2.0 VGuaranteed Input HIGH Voltage for
All Inputs
VIL Input LOW Voltage 0.6 VGuaranteed Input LOW Voltage for
All Inputs
VIK Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA
VO
Out
p
ut HIGH Voltage
2.4 3.4 V VCC = MIN, IOH = 3.0 mA
V
OH
O
u
tp
u
t
HIGH
Voltage
2.0 V VCC = MIN, IOH = MAX
VO
Out
p
ut LOW Voltage
0.25 0.4 V IOL = 12 mA VCC = VCC MIN,
VIN =V
IL or VIH
V
OL
O
u
tp
u
t
LOW
Voltage
0.35 0.5 V IOL = 24 mA
V
IN =
V
IL
or
V
IH
per T ruth Table
IOZH Output Off Current HIGH 20 µA VCC = MAX, VOUT = 2.7 V
IOZL Output Off Current LOW –400 µA VCC = MAX, VOUT = 0.4 V
A or B, DIR or G 20 µA VCC = MAX, VIN = 2.7 V
IIH Input HIGH Current DIR or G 0.1 mA VCC = MAX, VIN = 7.0 V
A or B 0.1 mA VCC = MAX, VIN = 5.5 V
IIL Input LOW Current –0.4 mA VCC = MAX, VIN = 0.4 V
IOS Output Short Circuit Current (Note 1) –40 –225 mA VCC = MAX
I
Power Supply Current
Total Output HIGH 70
mA
V MAX
I
CC Total, Output LOW 90 m
A
V
CC =
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 Propagation Delay
A to B 6.0
8.0 10
15 8.0
11 15
15 ns
tPLH
tPHL Propagation Delay
B to A 6.0
8.0 10
15 8.0
11 15
15 ns CL = 45 pF,
tPZL
tPZH Output Enable T ime
G, DIR to A 31
23 40
40 31
26 40
40 ns
L
RL = 667 Ω
tPZL
tPZH Output Enable T ime
G, DIR to B 31
23 40
40 31
26 40
40 ns
tPLZ
tPHZ Output Disable T ime
G, DIR to A 15
15 25
25 15
15 25
25 ns
C=50
p
F
tPLZ
tPHZ Output Disable T ime
G, DIR to B 15
15 25
25 15
15 25
25 ns
C
L =
5
.
0
pF
SN74LS640 SN74LS641 SN74LS642 SN74LS645
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4
SN74LS641 •SN74LS642
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol Parameter Min Typ Max Unit Test Conditions
VIH Input HIGH Voltage 2.0 VGuaranteed Input HIGH Voltage for
All Inputs
VIL Input LOW Voltage 0.6 VGuaranteed Input LOW Voltage for
All Inputs
VIK Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA
IOH Output HIGH Current 100 µA VCC = MIN, VOH = MAX
VO
p
0.25 0.4 V IOL = 12 mA VCC = VCC MIN,
VIN =V
IL or VIH
V
OL
u
u
0.35 0.5 V IOL = 24 mA
V
IN =
V
IL
or
V
IH
per T ruth Table
I
p
20 µA VCC = MAX, VIN = 2.7 V
I
IH
u
u
–0.1 mA VCC = MAX, VIN = 7.0 V
IIL Input LOW Current –0.4 mA VCC = MAX, VIN = 0.4 V
I
Power Supply Current
Total, Output HIGH 70
A
V MAX
ICC Total, Output LOW 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 Test Conditions
tPLH
tPHL Propagation Delay,
A to B 17
16 25
25 19
14 25
25 ns
tPLH
tPHL Propagation Delay,
B to A 17
16 25
25 19
14 25
25 ns CL = 45 pF,
tPLH
tPHL Propagation Delay,
G, DIR to A 23
34 40
50 26
43 40
60 ns
L
RL = 667 Ω
tPLH
tPHL Propagation Delay,
G, DIR to B 25
37 40
50 28
39 40
60 ns
SN74LS640 SN74LS641 SN74LS642 SN74LS645
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5
PACKAGE DIMENSIONS
N SUFFIX
PLASTIC PACKAGE
CASE 738–03
ISSUE E
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: INCH.
3. DIMENSION L TO CENTER OF LEAD WHEN
FORMED PARALLEL.
4. DIMENSION B DOES NOT INCLUDE MOLD
FLASH.
M
L
J20 PL M
B
M
0.25 (0.010) T
DIM MIN MAX MIN MAX
MILLIMETERSINCHES
A25.66 27.171.010 1.070
B6.10 6.600.240 0.260
C3.81 4.570.150 0.180
D0.39 0.550.015 0.022
G2.54 BSC0.100 BSC
J0.21 0.380.008 0.015
K2.80 3.550.110 0.140
L7.62 BSC0.300 BSC
M0 15 0 15
N0.51 1.010.020 0.040
____
E1.27 1.770.050 0.070
1
11
10
20
–A–
SEATING
PLANE
K
N
FG
D20 PL
–T–
M
A
M
0.25 (0.010) T
E
B
C
F1.27 BSC0.050 BSC
SN74LS640 SN74LS641 SN74LS642 SN74LS645
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6
PACKAGE DIMENSIONS
D SUFFIX
PLASTIC SOIC PACKAGE
CASE 751D–05
ISSUE F
20
1
11
10
B20X
H10X
C
L
18X A1
A
SEATING
PLANE
q
hX 45
_
E
D
M
0.25 M
B
M
0.25 S
AS
B
T
eT
B
A
DIM MIN MAX
MILLIMETERS
A2.35 2.65
A1 0.10 0.25
B0.35 0.49
C0.23 0.32
D12.65 12.95
E7.40 7.60
e1.27 BSC
H10.05 10.55
h0.25 0.75
L0.50 0.90
q
0 7
NOTES:
1. DIMENSIONS ARE IN MILLIMETERS.
2. INTERPRET DIMENSIONS AND TOLERANCES
PER ASME Y14.5M, 1994.
3. DIMENSIONS D AND E DO NOT INCLUDE MOLD
PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE.
5. DIMENSION B DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE PROTRUSION SHALL
BE 0.13 TOTAL IN EXCESS OF B DIMENSION AT
MAXIMUM MATERIAL CONDITION.
__
SN74LS640 SN74LS641 SN74LS642 SN74LS645
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7
Notes
SN74LS640 SN74LS641 SN74LS642 SN74LS645
http://onsemi.com
8
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