Semiconductor Components Industries, LLC, 1999
December, 1999 – Rev. 6
1 Publication 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
OPERATION
INPUTS
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
V
CC
Supply Voltage 4.75 5.0 5.25 V
T
A
Operating Ambient
T emperature Range
0 25 70 °C
I
OH
Output Current – High
–3.0 mA
–15 mA
I
OL
Output Current – Low 24 mA
GUARANTEED OPERATING RANGES (SN74LS641, SN74LS642)
Symbol Parameter Min Typ Max Unit
V
CC
Supply Voltage 4.75 5.0 5.25 V
T
A
Operating Ambient
T emperature Range
0 25 70 °C
V
OH
Output Voltage – High 5.5 V
I
OL
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
http://onsemi.com
2
CONNECTION DIAGRAMS DIP (TOP VIEW)
18 17 16 15 14 13
123456
7
20 19
8
V
CC
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
123456
7
20 19
8
V
CC
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
G
ENABLE
G
SN74LS640 SN74LS641 SN74LS642 SN74LS645
http://onsemi.com
3
SN74LS640 • SN74LS645
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol Parameter
Min Typ Max
Unit Test Conditions
V
IH
Input HIGH Voltage 2.0 V
Guaranteed Input HIGH Voltage for
All Inputs
V
IL
Input LOW Voltage
0.6
V
Guaranteed Input LOW Voltage for
All Inputs
V
IK
Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA
p
2.4 3.4 V VCC = MIN, IOH = 3.0 mA
VOHOutput HIGH Voltage
2.0 V
VCC = MIN, IOH = MAX
p
0.25 0.4 V IOL = 12 mA
VCC = VCC MIN,
VOLOutput LOW Voltage
0.35 0.5 V IOL = 24 mA
V
IN
=
V
IL
or
V
IH
per Truth Table
I
OZH
Output Off Current HIGH 20 µA VCC = MAX, V
OUT
= 2.7 V
I
OZL
Output Off Current LOW –400 µA VCC = MAX, V
OUT
= 0.4 V
A or B, DIR or G
20 µA VCC = MAX, VIN = 2.7 V
I
IH
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
I
IL
Input LOW Current –0.4 mA VCC = MAX, VIN = 0.4 V
I
OS
Output Short Circuit Current (Note 1) –40 –225 mA VCC = MAX
Power Supply Current
Total Output HIGH
70
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 (T
A
= 25°C, VCC = 5.0 V)
Limits
LS640 LS645
Symbol Parameter
Min Typ Max Min Typ Max
Unit Test Conditions
t
PLH
t
PHL
Propagation Delay
A to B
6.0
8.01015
8.01115
15
ns
t
PLH
t
PHL
Propagation Delay
B to A
6.0
8.01015
8.01115
15
ns
CL = 45 pF,
t
PZL
t
PZH
Output Enable Time
G
, DIR to A
312340
40
312640
40
ns
L
RL = 667 Ω
t
PZL
t
PZH
Output Enable Time
G
, DIR to B
312340
40
312640
40
ns
t
PLZ
t
PHZ
Output Disable Time
G
, DIR to A
151525
25
151525
25
ns
p
t
PLZ
t
PHZ
Output Disable Time
G
, DIR to B
151525
25
151525
25
ns
C
L
= 5.0
pF
SN74LS640 SN74LS641 SN74LS642 SN74LS645
http://onsemi.com
4
SN74LS641 • SN74LS642
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol Parameter
Min Typ Max
Unit Test Conditions
V
IH
Input HIGH Voltage 2.0 V
Guaranteed Input HIGH Voltage for
All Inputs
V
IL
Input LOW Voltage
0.6
V
Guaranteed Input LOW Voltage for
All Inputs
V
IK
Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA
I
OH
Output HIGH Current 100 µA VCC = MIN, VOH = MAX
p
0.25 0.4 V IOL = 12 mA
VCC = VCC MIN,
VOLOutput LOW Voltage
0.35 0.5 V IOL = 24 mA
V
IN
=
V
IL
or
V
IH
per Truth Table
p
20 µA VCC = MAX, VIN = 2.7 V
IIHInput HIGH Current
–0.1 mA VCC = MAX, VIN = 7.0 V
I
IL
Input LOW Current –0.4 mA VCC = MAX, VIN = 0.4 V
Power Supply Current
Total, Output HIGH
70
I
CC
Total, Output LOW
90
mA VCC = MAX
Total at HIGH Z
95
AC CHARACTERISTICS (T
A
= 25°C, VCC = 5.0 V)
Limits
LS641 LS642
Symbol Parameter
Min Typ Max Min Typ Max
Unit Test Conditions
t
PLH
t
PHL
Propagation Delay,
A to B
171625
25
191425
25
ns
t
PLH
t
PHL
Propagation Delay,
B to A
171625
25
191425
25
ns
CL = 45 pF,
t
PLH
t
PHL
Propagation Delay,
G
, DIR to A
233440
50
264340
60
ns
L
RL = 667 Ω
t
PLH
t
PHL
Propagation Delay,
G
, DIR to B
253740
50
283940
60
ns
SN74LS640 SN74LS641 SN74LS642 SN74LS645
http://onsemi.com
5
P ACKAGE 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
J
20 PL
M
B
M
0.25 (0.010) T
DIM MIN MAX MIN MAX
MILLIMETERSINCHES
A 25.66 27.171.010 1.070
B 6.10 6.600.240 0.260
C 3.81 4.570.150 0.180
D 0.39 0.550.015 0.022
G 2.54 BSC0.100 BSC
J 0.21 0.380.008 0.015
K 2.80 3.550.110 0.140
L 7.62 BSC0.300 BSC
M 0 15 0 15
N 0.51 1.010.020 0.040
____
E
1.27 1.770.050 0.070
1
11
10
20
–A–
SEATING
PLANE
K
N
FG
D
20 PL
–T–
M
A
M
0.25 (0.010) T
E
B
C
F
1.27 BSC0.050 BSC
SN74LS640 SN74LS641 SN74LS642 SN74LS645
http://onsemi.com
6
P ACKAGE 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
h X 45
_
E
D
M
0.25
M
B
M
0.25
SAS
B
T
e
T
B
A
DIM MIN MAX
MILLIMETERS
A 2.35 2.65
A1 0.10 0.25
B 0.35 0.49
C 0.23 0.32
D 12.65 12.95
E 7.40 7.60
e 1.27 BSC
H 10.05 10.55
h 0.25 0.75
L 0.50 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
http://onsemi.com
7
Notes
SN74LS640 SN74LS641 SN74LS642 SN74LS645
http://onsemi.com
8
ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes
without further notice to any products herein. SCILLC makes no warranty , representation or guarantee regarding the suitability of its products for any particular
purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability ,
including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be
validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others.
SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or
death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold
SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable
attorney fees arising out of, directly or indirectly , any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim
alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer .
PUBLICATION ORDERING INFORMATION
ASIA/PACIFIC: LDC for ON Semiconductor – Asia Support
Phone: 303–675–2121 (Tue–Fri 9:00am to 1:00pm, Hong Kong Time)
T oll Free from Hong Kong 800–4422–3781
Email: ONlit–asia@hibbertco.com
JAPAN: ON Semiconductor, Japan Customer Focus Center
4–32–1 Nishi–Gotanda, Shinagawa–ku, T okyo, Japan 141–8549
Phone: 81–3–5487–8345
Email: r14153@onsemi.com
Fax Response Line: 303–675–2167
800–344–3810 Toll Free USA/Canada
ON Semiconductor Website: http://onsemi.com
For additional information, please contact your local
Sales Representative.
SN74LS640/D
North America Literature Fulfillment:
Literature Distribution Center for ON Semiconductor
P.O. Box 5163, Denver, Colorado 80217 USA
Phone: 303–675–2175 or 800–344–3860 T oll Free USA/Canada
Fax: 303–675–2176 or 800–344–3867 Toll Free USA/Canada
Email: ONlit@hibbertco.com
N. American Technical Support: 800–282–9855 Toll Free USA/Canada
EUROPE: LDC for ON Semiconductor – European Support
German Phone: (+1) 303–308–7140 (M–F 2:30pm to 5:00pm Munich Time)
Email: ONlit–german@hibbertco.com
French Phone: (+1) 303–308–7141 (M–F 2:30pm to 5:00pm T oulouse T ime)
Email: ONlit–french@hibbertco.com
English Phone: (+1) 303–308–7142 (M–F 1:30pm to 5:00pm UK Time)
Email: ONlit@hibbertco.com
Loading...