SN55138, SN75138
QUADRUPLE BUS TRANSCEIVERS
SLLS079B – SEPTEMBER 1973 – REVISED MAY 1995
D
D
D
D
D
D
D
D
Single 5-V Supply
High-Input-Impedance, High-Threshold
Receivers
Common Driver Strobe
TTL-Compatible Driver and Strobe Inputs
With Clamp Diodes
High-Speed Operation
100-mA Open-Collector Driver Outputs
Four Independent Channels
TTL-Compatible Receiver Output
SN55138 . . . J OR W PACKAGE
SN75138 . . . D OR N PACKAGE
(TOP VIEW)
GND
1B
1R
1D
2D
2R
2B
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
CC
4B
4R
4D
S
3D
3R
3B
description
SN55138 . . . FK PACKAGE
The SN55138 and SN75138 quadruple bus
transceivers are designed for two-way data
communication over single-ended transmission
lines. Each of the four identical channels consists
of a driver with TTL inputs and a receiver with a
TTL output. The driver open-collector output is
designed to handle loads up to 100-mA open
collector. The receiver input is internally
connected to the driver output, and has a high
impedance to minimize loading of the
transmission line. Because of the high driver-
output current and the high receiver-input
impedance, a very large number (typically
hundreds) of transceivers may be connected to a
single data bus.
(TOP VIEW)
1R
1D
NC
2D
2R
4
5
6
7
8
3 2 1 20 19
18
17
16
15
14
9 10 11 12 13
1B
GND
NC
VCC
4B
4R
4D
NC
S
3D
NC – No internal connection
Copyright
©
1995, Texas Instruments Incorporated
The receiver design also features a threshold of 2.3 V (typical), providing a wider noise margin than would be
possible with a receiver having the usual TTL threshold. A strobe turns off all drivers (high impedance) but does
not affect receiver operation. These circuits are designed for operation from a single 5-V supply and include a
provision to minimize loading of the data bus when the power-supply voltage is zero.
The SN55138 is characterized for operation over the full military temperature range of – 55°C to 125°C. The
SN75138 is characterized for operation from 0°C to 70°C.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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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2B
GND
NC
3B
3R
1
SN55138, SN75138
QUADRUPLE BUS TRANSCEIVERS
SLLS079B – SEPTEMBER 1973 – REVISED MAY 1995
Function Tables
TRANSMITTING
INPUTS
S
L
L
D
H
L
OUTPUTS
B
L
H
R
H
L
RECEIVING
INPUTS
S
H
H
B
H
L
D
X
X
OUTPUT
R
L
H
H = high level, L = low level, X = irrelevant
logic symbol
†
S
1D
1R
2D
2R
3D
3R
4D
4R
12
4
3
5
6
11
10
13
14
15
4B
9
3B
1
7
2B
EN2
2
2
1B
logic diagram (positive logic)
S
1D
1R
12
4
3
7
2
1B
2D
2R
5
6
2B
3D
3R
11
10
9
3B
† This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
Pin numbers shown are for D, J, N, and W packages.
4D
4R
13
14
15
4B
schematics of inputs and outputs
EQUIVALENT OF EACH
STROBE AND DRIVER INPUT
VCC
4 kΩ NOM
Input
Input
2 kΩ NOM
Output
Output
EQUIVALENT OF
EACH RECEIVER INPUT
VCC
TYPICAL OF ALL
DRIVER OUTPUTS
TYPICAL OF ALL
RECEIVER OUTPUTS
VCC
130
Ω
NOM
2
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SN55138, SN75138
QUADRUPLE BUS TRANSCEIVERS
SLLS079B – SEPTEMBER 1973 – REVISED MAY 1995
absolute maximum ratings over operating free-air temperature (unless otherwise noted)
†
Supply voltage, V
CC
(see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Input voltage, V
I
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V
Driver off-state output voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Low-level output current into the driver output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 mA
Continuous total dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table
Operating free-air temperature range, T
A
: SN55138 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C
SN75138 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
Storage temperature range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: D, N, or W package . . . . . . . . . . . . . 260°C
Case temperature for 60 seconds, T
C
: FK package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C
Lead temperature 1,6 mm (1/16 inch) from case for 60 seconds: J package . . . . . . . . . . . . . . . . . . . . . 300°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.
NOTE 1: All voltage values are with respect to both ground terminals connected together.
DISSIPATION RATING TABLE
PACKAGE
D
FK‡
J‡
N
W
TA
≤
25°C
POWER RATING
950 mW
1375 mW
1375 mW
1150 mW
1000 mW
DERATING FACTOR
ABOVE TA = 25°C
7.6 mW/°C
11.0 mW/°C
11.0 mW/°C
9.2 mW/°C
8.0 mW/°C
TA = 70°C
POWER RATING
608 mW
880 mW
880 mW
736 mW
640 mW
TA = 125°C
POWER RATING
—
275 mW
275 mW
—
200 mW
‡ In the FK and J packages, the SN55138 chip is alloy mounted.
recommended operating conditions
SN55138
MIN
Supply voltage, VCC
High-level
High level input voltage, VIH
voltage
Low-level
Low level input voltage VIL
voltage,
High-level output current, IOH
Low-level
Low level output current, IOL
current
Operating free-air temperature, TA
Driver or strobe
Receiver
Driver or strobe
Receiver
Receiver output
Driver output
Receiver output
– 55
4.5
2
3.2
0.8
1.5
– 400
100
16
125
0
NOM
MAX
5.5
MIN
4.75
2
2.9
0.8
1.8
– 400
100
16
70
SN75138
NOM
5
MAX
5.25
UNIT
V
V
V
µA
mA
°C
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3
SN55138, SN75138
QUADRUPLE BUS TRANSCEIVERS
SLLS079B – SEPTEMBER 1973 – REVISED MAY 1995
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
VIK
Input clamp
voltage
High-level
output
voltage
Low-level
out ut
output
voltage
Input current
at maximum
input voltage
High-level
g
input current
Driver or
strobe
Receiver
TEST CONDITIONS†
VCC = MIN,
VCC = MIN,
VIL(R) = VIL max,
VCC = MIN,
VIL(S) = 0.8 V,
VCC = MIN,
VIH(S) = 2 V,
VCC = MAX,
II = – 12 mA
VIH(S) = 2 V,
IOH = – 400
µA
VIH(D) = 2 V,
IOL = 100 mA
VIH(R) = VIH min,
IOL = 16 mA
VI = VCC
SN55138
MIN TYP‡ MAX
–1.5
SN75138
MIN TYP‡ MAX
–1.5
UNIT
V
VOH
2.4
3.5
2.4
3.5
V
Driver
Receiver
Driver or
strobe
Driver or
strobe
Receiver
Driver or
strobe
Receiver
0.45
0.4
0.45
V
0.4
VOL
II(max)
1
1
mA
VCC = MAX,
VCC = 5 V,
VI(S) = 2 V
VCC = MAX,
VCC = MAX,
VI(S) = 2 V
VCC = 0
0,
VI = 2.4 V
VI(R) = 4.5 V,
25
–1
40
300
–1.6
– 50
25
–1
40
µA
300
–1.6
– 50
mA
µA
IIH
IIL
Low-level
input current
VI = 0.4 V
VI(R) = 0.45 V,
II( ff)
I(off)
Input current
with power
ower
off
Short-circuit
out ut
output
current§
Receiver
VI = 4 5 V
4.5
1.1
11
1.5
15
1.1
11
1.5
15
mA
IOS
Receiver
All driver
outputs low
VCC = MAX
VCC = MAX,
VI(S) = 0.8 V
VI(D) = 2 V,
– 20
– 55
– 18
– 55
mA
50
65
50
65
mA
ICC
Supply
current
All driver
out uts
outputs
high
VCC = MAX,
VI(R) = 3.5 V,
VI(S) = 2 V
V,
Receiver outputs open
42
55
42
55
† For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions. Parenthetical letters D,
R, and S used with VI refer to the driver input, receiver input, and strobe input, respectively.
‡ All typical values are at VCC = 5 V, TA = 25°C.
§ Not more than one output should be shorted at a time.
switching characteristics, V
CC
= 5 V, T
A
= 25°C
PARAMETER¶
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
FROM
(INPUT)
Driver
Strobe
Receiver
TO
(OUTPUT)
Driver
CL = 50 pF
pF,
Driver
Receiver
CL = 15 pF
RL = 400
Ω
Ω,
See Figure 2
RL = 50
Ω
Ω,
See Figure 1
TEST CONDITIONS
MIN
TYP
15
14
18
22
7
8
MAX
24
24
28
32
15
15
UNIT
ns
ns
ns
¶ tPLH = propagation delay time, low- to high-level output
tPHL = propagation delay time, high- to low-level output
4
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
SN55138, SN75138
QUADRUPLE BUS TRANSCEIVERS
SLLS079B – SEPTEMBER 1973 – REVISED MAY 1995
PARAMETER MEASUREMENT INFORMATION
VCC
RL
From Output
Under Test
Test Point
CL
(see Note B)
TEST CIRCUIT
Driver
Input
See Note D
Strobe
Input
tPLH
tPHL
VOH
2.5 V
Driver
Output
VOLTAGE WAVEFORMS
NOTES: A. Input pulses are supplied by generators having the following characteristics: tw = 100 ns, PRR
≤
1 MHz, tr
≤
10 ns, tf
≤
10 ns,
ZO
≈
50
Ω.
B. CL includes probe and jig capacitance.
C. All diodes are 1N916 or 1N3064.
D. When testing driver input (solid line) strobe must be low; when testing strobe input (dashed line) driver input must be high.
2.5 V
VOL
1.5 V
1.5 V
0V
3V
Figure 1. Propagation Delay Times From Data and Strobe Inputs
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5
