SN74ALS638A, SN74ALS639A, SN74AS638A, SN74AS639
OCTAL BUS TRANSCEIVERS
SDAS123A – DECEMBER 1983 – REVISED JANUARY 1995
Copyright 1995, Texas Instruments Incorporated
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
•Bidirectional Bus Transceivers in
High-Density 20-Pin Packages
•Choice of True or Inverting Logic
•A-Bus Outputs Are Open Collector;
B-Bus Outputs Are 3 State
•Package Options Include Plastic
Small-Outline (DW) Packages and
Standard Plastic (N) 300-mil DIPs
DEVICE A
OUTPUT B
OUTPUT LOGIC
SN74ALS638A, SN74AS638A Open collector 3 state Inverting
SN74ALS639A, SN74AS639 Open collector 3 state T rue
description
These octal bus transceivers are designed for asynchronous two-way communication between open-collector
and 3-state buses. The devices transmit data from the A bus (open-collector) to the B bus (3 state) or from the
B bus to the A bus, depending on the logic level at the direction-control (DIR) input. The output-enable (OE) input
can be used to disable the device so the buses are isolated.
The -1 version of SN74ALS638A is identical to the standard version, except that the recommended maximum
IOL is increased to 48 mA.
The SN74ALS638A, SN74ALS639A, SN74AS638A, and SN74AS639 are characterized for operation from 0°C
to 70°C.
FUNCTION TABLE
INPUTS OPERATION
OE DIR SN74ALS638A
SN74AS638A SN74ALS639A
SN74AS639
L L B data to A bus B data to A bus
LHA data to B bus A data to B bus
H X Isolation Isolation
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
DIR
A1
A2
A3
A4
A5
A6
A7
A8
GND
VCC
OE
B1
B2
B3
B4
B5
B6
B7
B8
DW OR N PACKAGE
(TOP VIEW)
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
SN74ALS638A, SN74ALS639A, SN74AS638A, SN74AS639
OCTAL BUS TRANSCEIVERS
SDAS123A – DECEMBER 1983 – REVISED JANUARY 1995
2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
logic symbols†
B2
17
B3
16
B4
15
A5 6
A6 7
A7 8
A8 9
A2 3
A3 4
A4 5
OE
A1 2
G3
19
3 EN2 [AB]
B5
14
B6
13
B7
12
B8
11
B1
18
3 EN1 [BA]
1
DIR
1
2
B2
17
B3
16
B4
15
A5 6
A6 7
A7 8
A8 9
A2 3
A3 4
A4 5
OE
A1 2
G3
19
3 EN2 [AB]
B5
14
B6
13
B7
12
B8
11
B1
18
3 EN1 [BA]
1
DIR
1
2
SN74ALS638A, SN74AS638A SN74ALS639A, SN74AS639
†These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
logic diagrams (positive logic)
SN74ALS638A, SN74AS638A SN74ALS639A, SN74AS639
To Seven Other T ransceivers
OE
A1
DIR
B1
19
2
1
18
To Seven Other T ransceivers
OE
A1
DIR
B1
19
2
1
18
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)‡
Supply voltage, VCC 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, VI: All inputs 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A-bus I/O ports 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B-bus I/O ports 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, TA: SN74ALS638A, SN74ALS639A 0°C to 70°C. . . . . . . . . . . . . . . . .
Storage temperature range –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
‡Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only , and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may af fect device reliability.
SN74ALS638A, SN74ALS639A, SN74AS638A, SN74AS639
OCTAL BUS TRANSCEIVERS
SDAS123A – DECEMBER 1983 – REVISED JANUARY 1995
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
recommended operating conditions
SN74ALS638A
SN74ALS639A UNIT
MIN NOM MAX
VCC Supply voltage 4.5 5 5.5 V
VIH High-level input voltage 2 V
VIL Low-level input voltage 0.8 V
VOH High-level output voltage A ports 5.5 V
IOH High-level output current B ports –15 mA
IOL
Low level out
p
ut current
AorB
p
orts
24
mA
I
OL
Lo
w-
le
v
el
o
u
tp
u
t
c
u
rrent
A
or
B
ports
48†
mA
TAOperating free-air temperature 0 70 °C
†Applies only to the SN74ALS638A-1 version and only if VCC is between 4.75 V and 5.25 V
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER TEST CONDITIONS SN74ALS638A
SN74ALS639A UNIT
MIN TYP‡MAX
VIK VCC = 4.5 V, II = –18 mA –1.5 V
IOH A ports VCC = 4.5 V, VOH = 5.5 V 0.1 mA
VCC = 4.5 V to 5.5 V, IOH = –0.4 mA VCC –2
VOH B ports
VCC =45V
IOH = –3 mA 2.4 3.2 V
V
CC =
4
.
5
V
IOH = –15 mA 2
IOL = 12 mA 0.25 0.4
VOL A or B ports VCC = 4.5 V IOL = 24 mA 0.35 0.5 V
IOL = 48 mA†0.35 0.5
II
Control inputs
VCC =55V
VI = 7 V 0.1
mA
I
IA or B ports
V
CC =
5
.
5
V
VI = 5.5 V 0.1
mA
IIH
Control inputs
VCC =55V
VI=27V
20
µA
I
IH A or B ports§
V
CC =
5
.
5
V
,
V
I =
2
.
7
V
20 µ
A
IIL
Control inputs
VCC =55V
VI=04V
–0.1
mA
I
IL A or B ports§
V
CC =
5
.
5
V
,
V
I =
0
.
4
V
–0.1
mA
IO¶B ports VCC = 5.5 V, VO = 2.25 V –30 –112 mA
Outputs high 18 30
SN74ALS638A VCC = 5.5 V Outputs low 26 41
ICC
Outputs disabled 16 30
mA
I
CC Outputs high 25 40
mA
SN74ALS639A VCC = 5.5 V Outputs low 30 50
Outputs disabled 33 54
†Applies only to the SN74ALS638A-1 version and only if VCC is between 4.75 V and 5.25 V
‡All typical values are at VCC = 5 V, TA = 25°C.
§For I/O ports, the parameters IIH and IIL include the off-state output current.
¶The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.
SN74ALS638A, SN74ALS639A, SN74AS638A, SN74AS639
OCTAL BUS TRANSCEIVERS
SDAS123A – DECEMBER 1983 – REVISED JANUARY 1995
4POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
switching characteristics (see Figure 1)
PARAMETER FROM
(INPUT) TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 680 Ω (A outputs),
R1 = R2 = 500 Ω (B outputs),
TA = MIN to MAX†UNIT
SN74ALS638A SN74ALS639A
MIN MAX MIN MAX
tPLH
A
B
212 2 12
ns
tPHL
A
B
2 12 2 12
ns
tPLH
B
A
825 10 30
ns
tPHL
B
A
8 30 5 22
ns
tPLH
OE
A
525 10 30
ns
tPHL
OE
A
10 45 10 35
ns
tPZH
OE
B
520 6 21
ns
tPZL
OE
B
522 8 25
ns
tPHZ
OE
B
2 10 2 10
ns
tPLZ
OE
B
315 3 16
ns
†For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)‡
Supply voltage, VCC 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, VI: All inputs 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A-bus I/O ports 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B-bus I/O ports 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, TA: SN74AS638A, SN74AS639 0°C to 70°C. . . . . . . . . . . . . . . . . . . .
Storage temperature range –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
‡Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only , and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may af fect device reliability.
recommended operating conditions
SN74AS638A
SN74AS639 UNIT
MIN NOM MAX
VCC Supply voltage 4.5 5 5.5 V
VIH High-level input voltage 2 V
VIL Low-level input voltage 0.8 V
VOH High-level output voltage A ports 5.5 V
IOH High-level output current B ports –15 mA
IOL Low-level output current A or B ports 64 mA
TAOperating free-air temperature 0 70 °C
SN74ALS638A, SN74ALS639A, SN74AS638A, SN74AS639
OCTAL BUS TRANSCEIVERS
SDAS123A – DECEMBER 1983 – REVISED JANUARY 1995
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER TEST CONDITIONS SN74AS638A
SN74AS639 UNIT
MIN TYP†MAX
VIK VCC = 4.5 V, II = –18 mA –1.2 V
IOH A ports VCC = 4.5 V, VOH = 5.5 V 0.1 mA
VCC = 4.5 V to 5.5 V, IOH = –2 mA VCC –2
VOH B ports
VCC =45V
IOH = –3 mA 2.4 3.2 V
V
CC =
4
.
5
V
IOH = –15 mA 2.4
VOL A or B ports VCC = 4.5 V, IOL = 64 mA 0.35 0.55 V
II
Control inputs
VCC =55V
VI = 7 V 0.1
mA
I
IA or B ports
V
CC =
5
.
5
V
VI = 5.5 V 0.1
mA
IIH
Control inputs
VCC =55V
VI=27V
20
µA
I
IH A or B ports‡
V
CC =
5
.
5
V
,
V
I =
2
.
7
V
70 µ
A
IIL
Control inputs
VCC =55V
VI=04V
–0.5
mA
I
IL A or B ports‡
V
CC =
5
.
5
V
,
V
I =
0
.
4
V
–0.75
mA
IO§VCC = 5.5 V, VO = 2.25 V –50 –150 mA
Outputs high 24 54
SN74AS638A VCC = 5.5 V Outputs low 75 122
ICC
Outputs disabled 37 61
mA
I
CC Outputs high 56 92
mA
SN74AS639 VCC = 5.5 V Outputs low 95 154
Outputs disabled 62 100
†All typical values are at VCC = 5 V, TA = 25°C.
‡For I/O ports, the parameters IIH and IIL include the off-state output current.
§The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.
switching characteristics (see Figure 1)
PARAMETER FROM
(INPUT) TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 500 Ω (A outputs),
R1 = R2 = 500 Ω (B outputs),
TA = MIN to MAX¶UNIT
SN74AS638A SN74AS639
MIN MAX MIN MAX
tPLH
A
B
2 7 2 9.5
ns
tPHL
A
B
2 6.5 2 9
ns
tPLH
B
A
520 5 22
ns
tPHL
B
A
2 7 2 9
ns
tPLH
OE
A
519 5 21.5
ns
tPHL
OE
A
2 9 2 11.5
ns
tPZH
OE
B
2 8 2 10.5
ns
tPZL
OE
B
210 2 10.5
ns
tPHZ
OE
B
2 7 2 7
ns
tPLZ
OE
B
210 2 10.5
ns
¶For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
SN74ALS638A, SN74ALS639A, SN74AS638A, SN74AS639
OCTAL BUS TRANSCEIVERS
SDAS123A – DECEMBER 1983 – REVISED JANUARY 1995
6POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
SERIES 54ALS/74ALS AND 54AS/74AS DEVICES
tPHZ
tPLZ
tPHL tPLH
0.3 V
tPZL
tPZH
tPLH tPHL
LOAD CIRCUIT
FOR 3-STATE OUTPUTS
From Output
Under Test Test
Point
R1
S1
CL
(see Note A)
7 V
1.3 V
1.3 V1.3 V
3.5 V
3.5 V
0.3 V
0.3 V
th
tsu
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
Timing
Input
Data
Input
1.3 V 1.3 V 3.5 V
3.5 V
0.3 V
0.3 V
High-Level
Pulse
Low-Level
Pulse
tw
VOLTAGE WAVEFORMS
PULSE DURATIONS
Input
Out-of-Phase
Output
(see Note C)
1.3 V 1.3 V
1.3 V1.3 V
1.3 V 1.3 V
1.3 V1.3 V
1.3 V
1.3 V
3.5 V
3.5 V
0.3 V
0.3 V
VOL
VOH
VOH
VOL
Output
Control
(low-level
enabling)
W aveform 1
S1 Closed
(see Note B)
W aveform 2
S1 Open
(see Note B)
[
0 V
VOH
VOL
[
3.5 V
In-Phase
Output
0.3 V
1.3 V 1.3 V
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS
R2
VCC
RL
Test
Point
From Output
Under Test
CL
(see Note A)
LOAD CIRCUIT
FOR OPEN-COLLECTOR OUTPUTS
LOAD CIRCUIT FOR
BI-STATE
TOTEM-POLE OUTPUTS
From Output
Under Test Test
Point
CL
(see Note A) RL
RL = R1 = R2
NOTES: A. CL includes probe and jig capacitance.
B. W aveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
W aveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. When measuring propagation delay items of 3-state outputs, switch S1 is open.
D. All input pulses have the following characteristics: PRR ≤ 1 MHz, tr = tf = 2 ns, duty cycle = 50%.
E. The outputs are measured one at a time with one transition per measurement.
Figure 1. Load Circuits and Voltage Waveforms
PACKAGE OPTION ADDENDUM
www.ti.com 7-Jun-2010
Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status (1) Package Type Package
Drawing Pins Package Qty Eco Plan (2) Lead/
Ball Finish MSL Peak Temp (3) Samples
(Requires Login)
SN74ALS638A-1N ACTIVE PDIP N 20 20 Pb-Free (RoHS) CU NIPDAU N / A for Pkg Type Purchase Samples
SN74ALS638A-1NE4 ACTIVE PDIP N 20 20 Pb-Free (RoHS) CU NIPDAU N / A for Pkg Type Purchase Samples
SN74ALS638A-1NSR ACTIVE SO NS 20 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS638A-1NSRE4 ACTIVE SO NS 20 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS638A-1NSRG4 ACTIVE SO NS 20 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS638AN ACTIVE PDIP N 20 20 Pb-Free (RoHS) CU NIPDAU N / A for Pkg Type Purchase Samples
SN74ALS638ANE4 ACTIVE PDIP N 20 20 Pb-Free (RoHS) CU NIPDAU N / A for Pkg Type Purchase Samples
SN74ALS638ANSR ACTIVE SO NS 20 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS638ANSRE4 ACTIVE SO NS 20 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS638ANSRG4 ACTIVE SO NS 20 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS639ADW ACTIVE SOIC DW 20 25 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS639ADWE4 ACTIVE SOIC DW 20 25 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS639ADWG4 ACTIVE SOIC DW 20 25 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS639AN ACTIVE PDIP N 20 20 Pb-Free (RoHS) CU NIPDAU N / A for Pkg Type Purchase Samples
SN74ALS639ANE4 ACTIVE PDIP N 20 20 Pb-Free (RoHS) CU NIPDAU N / A for Pkg Type Purchase Samples
SN74ALS639ANSR ACTIVE SO NS 20 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS639ANSRE4 ACTIVE SO NS 20 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74ALS639ANSRG4 ACTIVE SO NS 20 2000 Green (RoHS
& no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Purchase Samples
SN74AS638AN NRND PDIP N 20 20 Pb-Free (RoHS) CU NIPDAU N / A for Pkg Type Samples Not Available
SN74AS638ANE4 NRND PDIP N 20 20 Pb-Free (RoHS) CU NIPDAU N / A for Pkg Type Samples Not Available
SN74AS639DW OBSOLETE SOIC DW 20 TBD Call TI Call TI Samples Not Available
PACKAGE OPTION ADDENDUM
www.ti.com 7-Jun-2010
Addendum-Page 2
Orderable Device Status (1) Package Type Package
Drawing Pins Package Qty Eco Plan (2) Lead/
Ball Finish MSL Peak Temp (3) Samples
(Requires Login)
SN74AS639DWR OBSOLETE SOIC DW 20 TBD Call TI Call TI Samples Not Available
SN74AS639N OBSOLETE PDIP N 20 TBD Call TI Call TI Samples Not Available
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
SN74ALS638A-1NSR SO NS 20 2000 330.0 24.4 8.2 13.0 2.5 12.0 24.0 Q1
SN74ALS638ANSR SO NS 20 2000 330.0 24.4 8.2 13.0 2.5 12.0 24.0 Q1
SN74ALS639ANSR SO NS 20 2000 330.0 24.4 8.2 13.0 2.5 12.0 24.0 Q1
PACKAGE MATERIALS INFORMATION
www.ti.com 14-Jul-2012
Pack Materials-Page 1
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
SN74ALS638A-1NSR SO NS 20 2000 367.0 367.0 45.0
SN74ALS638ANSR SO NS 20 2000 367.0 367.0 45.0
SN74ALS639ANSR SO NS 20 2000 367.0 367.0 45.0
PACKAGE MATERIALS INFORMATION
www.ti.com 14-Jul-2012
Pack Materials-Page 2
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