SN54ALS640B, SN54AS640, SN74ALS640B, SN74AS640 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SDAS122A – DECEMBER 1983 – REVISED JANUARY 1995
• •
Bidirectional Bus Transceivers in High-Density 20-Pin Packages Inverting Logic Package Options Include Plastic Small-Outline (DW) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs
SN54ALS640B, SN54AS640 . . . J PACKAGE SN74ALS640B, SN74AS640 . . . DW OR N PACKAGE (TOP VIEW)
DIR A1 A2 A3 A4 A5 A6 A7 A8 GND
description These octal bus transceivers are designed for asynchronous two-way communication between data buses. These devices transmit data from the A bus to the B bus or from the B bus to the A bus, depending upon the level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the device so that the buses are effectively isolated.
1
20
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
VCC OE B1 B2 B3 B4 B5 B6 B7 B8
A2 A1 DIR VCC
SN54ALS640B, SN54AS640 . . . FK PACKAGE (TOP VIEW)
The -1 version of the SN74ALS640B is identical to the standard version, except that the recommended maximum IOL for the -1 version is increased to 48 mA. There is no -1 version of the SN54ALS640B.
A3 A4 A5 A6 A7
The SN54ALS640B and SN54AS640 are characterized for operation over the full military temperature range of – 55°C to 125°C. The SN74ALS640B and SN74AS640 are characterized for operation from 0°C to 70°C.
OE
•
4
3 2 1 20 19 18
5
17
6
16
7
15 14
8
B1 B2 B3 B4 B5
A8 GND B8 B7 B6
9 10 11 12 13
FUNCTION TABLE INPUTS OE
DIR
OPERATION
L
L
B data to A bus
L
H
A data to B bus
H
X
Isolation
Copyright 1995, Texas Instruments Incorporated
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.
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• DALLAS, TEXAS 75265
1
SN54ALS640B, SN54AS640, SN74ALS640B, SN74AS640 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SDAS122A – DECEMBER 1983 – REVISED JANUARY 1995
logic symbol† OE DIR
A1
19 1
logic diagram (positive logic) OE
G3
19
3 EN1 [BA] 3 EN2 [AB]
2
18
1
DIR
B1
1
2 A2 A3 A4 A5 A6 A7 A8
3
17
4
16
5
15
6
14
7
13
8
12
9
11
B2 B3
A1
2
18
B1
B4 B5 B6 B7 To Seven Other Transceivers
B8
† This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)‡ Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Input voltage, VI: All inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V I/O ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V Operating free-air temperature range, TA: SN54ALS640B . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C SN74ALS640B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 affect device reliability.
recommended operating conditions SN54ALS640B VCC VIH
Supply voltage
VIL IOH
Low-level input voltage
IOL
High-level input voltage
NOM
MAX
MIN
NOM
MAX
4.5
5
5.5
4.5
5
5.5
2
High-level output current Low level output current Low-level
TA Operating free-air temperature § Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V
2
SN74ALS640B
MIN
POST OFFICE BOX 655303
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• DALLAS, TEXAS 75265
2
UNIT V V
0.7
0.8
V
– 12
– 15
mA
12
24 48§
mA
70
°C
125
0
SN54ALS640B, SN54AS640, SN74ALS640B, SN74AS640 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SDAS122A – DECEMBER 1983 – REVISED JANUARY 1995
electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER VIK
VOH
SN54ALS640B TYP† MAX
TEST CONDITIONS
MIN
VCC = 4.5 V, VCC = 4.5 V to 5.5 V,
II = – 18 mA IOH = – 0.4 mA
VCC = 4.5 V
IOH = – 3 mA IOH = – 12 mA
– 1.5 VCC – 2 2.4
II
VCC = 4.5 V Control inputs A or B ports
VCC = 5 5.5 5V
VI = 7 V VI = 5.5 V
Control inputs A or B ports§
VCC = 5 5.5 5V V,
VI = 2 2.7 7V
IIL
Control inputs A or B ports§
5V VCC = 5 5.5 V,
4V VI = 0 0.4
VCC = 5.5 V,
VO = 2.25 V Outputs high
ICC
3.2
3.2
VCC = 5.5 V
UNIT V
V
2 0.25
0.4
IOL = 24 mA IOL = 48 mA‡
IIH
IO¶
– 1.5 VCC – 2 2.4
2
IOH = – 15 mA IOL = 12 mA VOL
SN74ALS640B TYP† MAX
MIN
– 20
Outputs low
0.25
0.4
0.35
0.5
0.35
0.5
0.1
0.1
0.1
0.1
20
20
20
20
– 0.1
– 0.1
– 0.1
– 0.1
– 112
– 30
– 112
19
50
19
45
27
60
27
55
V
mA µA mA mA mA
Outputs disabled 28 55 28 50 † All typical values are at VCC = 5 V, TA = 25°C. ‡ Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V § 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, R1 = 500 Ω, R2 = 500 Ω, TA = MIN to MAX# SN54ALS640B
tPLH tPHL
A or B
B or A
tPZH tPZL
OE
A or B
tPHZ tPLZ
OE
A or B
UNIT
SN74ALS640B
MIN
MAX
MIN
2
14
2
MAX 11
2
13
2
10
4
25
4
21
5
27
5
24
2
12
2
10
3
20
3
15
ns ns ns
# For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
3
SN54ALS640B, SN54AS640, SN74ALS640B, SN74AS640 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SDAS122A – DECEMBER 1983 – REVISED JANUARY 1995
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Input voltage, VI: All inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V I/O ports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V Operating free-air temperature range, TA: SN54AS640 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C SN74AS640 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 affect device reliability.
recommended operating conditions SN54AS640
SN74AS640
MIN
NOM
MAX
MIN
NOM
MAX
4.5
5
5.5
4.5
5
5.5
UNIT
VCC VIH
Supply voltage
VIL IOH
Low-level input voltage
0.8
0.8
V
High-level output current
– 12
– 15
mA
IOL TA
Low-level output current
48
64
mA
70
°C
High-level input voltage
2
Operating free-air temperature
2
– 55
125
V V
0
electrical characteristics over recommended operating free-air temperature range (unless otherwise noted) PARAMETER VIK
II
Control inputs A or B ports
II = – 18 mA IOH = – 2 mA
VCC = 4.5 V to 5.5 V,
IOH = – 2 mA IOH = – 3 mA
VCC = 4.5 V
IOH = – 12 mA IOH = – 15 mA
VCC = 4 4.5 5V
IOL = 48 mA IOL = 64 mA
VCC = 5 5.5 5V
VI = 7 V VI = 5.5 V
IIH
Control inputs A or B ports§
VCC = 5 5.5 5V V,
VI = 2 2.7 7V
IIL
Control inputs A or B ports§
VCC = 5 5.5 5V V,
VI = 0 0.4 4V
VCC = 5.5 V,
VO = 2.25 V Outputs high
IO¶ ICC
MIN
VCC = 4.5 V, VCC = 4.5 V,
VOH
VOL
SN54AS640 TYP‡ MAX
TEST CONDITIONS
VCC = 5.5 V
SN74AS640 TYP‡ MAX
MIN
– 1.2
– 1.2
UNIT V
VCC – 2 2.4
VCC – 2 2.4
3.2
V
3.2
2.4 2.4 0.3
0.55 0.35
– 50
Outputs low
0.55
0.1
0.1
0.1
0.1
20
20
70
70
– 0.5
– 0.5
– 0.75
– 0.75
– 150
– 50
– 150
37
58
37
58
78
123
78
123
V mA µA mA mA mA
Outputs disabled 51 80 51 80 ‡ 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.
4
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
SN54ALS640B, SN54AS640, SN74ALS640B, SN74AS640 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SDAS122A – DECEMBER 1983 – REVISED JANUARY 1995
switching characteristics (see Figure 1)
PARAMETER
FROM (INPUT)
TO (OUTPUT)
VCC = 4.5 V to 5.5 V, CL = 50 pF, R1 = 500 Ω, R2 = 500 Ω, TA = MIN to MAX† SN54AS640
tPLH tPHL
A or B
B or A
tPZH tPZL
OE
A or B
tPHZ tPLZ
OE
A or B
UNIT
SN74AS640
MIN
MAX
MIN
MAX
1
8
2
7
1
7
2
6
2
10
2
8
2
12
2
10
2
9
2
8
2
16
2
13
ns ns ns
† For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
5
SN54ALS640B, SN54AS640, SN74ALS640B, SN74AS640 OCTAL BUS TRANSCEIVERS WITH 3-STATE OUTPUTS SDAS122A – DECEMBER 1983 – REVISED JANUARY 1995
PARAMETER MEASUREMENT INFORMATION SERIES 54ALS/74ALS AND 54AS/74AS DEVICES 7V RL = R1 = R2
VCC S1 RL R1
Test Point
From Output Under Test CL (see Note A)
From Output Under Test
RL
Test Point
From Output Under Test CL (see Note A)
CL (see Note A)
LOAD CIRCUIT FOR BI-STATE TOTEM-POLE OUTPUTS
LOAD CIRCUIT FOR OPEN-COLLECTOR OUTPUTS
3.5 V
Timing Input
Test Point
LOAD CIRCUIT FOR 3-STATE OUTPUTS
3.5 V
High-Level Pulse
1.3 V
R2
1.3 V
1.3 V 0.3 V
0.3 V
Data Input
tw
th
tsu
3.5 V 1.3 V
3.5 V
Low-Level Pulse
1.3 V 0.3 V
1.3 V
0.3 V
VOLTAGE WAVEFORMS SETUP AND HOLD TIMES
VOLTAGE WAVEFORMS PULSE DURATIONS
3.5 V
Output Control (low-level enabling)
1.3 V
1.3 V 0.3 V
tPZL Waveform 1 S1 Closed (see Note B)
tPLZ
[3.5 V
1.3 V
tPHZ tPZH Waveform 2 S1 Open (see Note B)
1.3 V
VOL 0.3 V VOH
1.3 V
0.3 V
[0 V
3.5 V 1.3 V
Input
1.3 V 0.3 V tPHL
tPLH
VOH
In-Phase Output
1.3 V
1.3 V VOL tPLH
tPHL
VOH
Out-of-Phase Output (see Note C)
1.3 V
1.3 V VOL
VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES
VOLTAGE WAVEFORMS ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS
NOTES: A. CL includes probe and jig capacitance. B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control. Waveform 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
6
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