TI SN75138N

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
16
2
15
3
14
4
13
5
12
6
11
7
10
8
9
VCC
4B
4R
4D
S
3D
3R
3B
description
SN55138 . . . FK PACKAGE
1B
GND
NC
VCC
4B
(TOP VIEW)
1R
1D
NC
2D
2R
4
3 2 1 20 19
18
5
17
6
16
7
15
8
14
9 10 11 12 13
4R
4D
NC
S
3D
2B
GND
NC
3B
3R
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 driveroutput current and the high receiver-input
impedance, a very large number (typically
hundreds) of transceivers may be connected to a
single data bus.
NC – No internal connection
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.
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.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
1
SN55138, SN75138
QUADRUPLE BUS TRANSCEIVERS
SLLS079B – SEPTEMBER 1973 – REVISED MAY 1995
Function Tables
TRANSMITTING
INPUTS
S
D
L
L
OUTPUTS
B
R
H
L
H
L
H
L
RECEIVING
INPUTS
OUTPUT
R
S
B
D
H
H
X
L
H
L
X
H
H = high level, L = low level, X = irrelevant
logic symbol†
S
1D
1R
2D
2R
3D
3R
4D
4R
12
logic diagram (positive logic)
S
EN2
4
3
2
2
1B
1D
1
7
5
1R
9
2
4
2D
3B
2R
7
5
15
4B
3D
14
3R
† 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
9
11
VCC
EQUIVALENT OF
EACH RECEIVER INPUT
15
13
14
TYPICAL OF ALL
DRIVER OUTPUTS
VCC
Input
TYPICAL OF ALL
RECEIVER OUTPUTS
VCC
130 Ω NOM
4 kΩ NOM
Input
2 kΩ NOM
Output
Output
2
POST OFFICE BOX 655303
3B
10
schematics of inputs and outputs
EQUIVALENT OF EACH
STROBE AND DRIVER INPUT
2B
6
10
13
1B
3
2B
6
11
12
• DALLAS, TEXAS 75265
4B
SN55138, SN75138
QUADRUPLE BUS TRANSCEIVERS
SLLS079B – SEPTEMBER 1973 – REVISED MAY 1995
absolute maximum ratings over operating free-air temperature (unless otherwise noted)†
Supply voltage, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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, TA: SN55138 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 55°C to 125°C
SN75138 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 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, TC: 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
TA ≤ 25°C
POWER RATING
D
FK‡
J‡
1375 mW
DERATING FACTOR
ABOVE TA = 25°C
TA = 70°C
POWER RATING
TA = 125°C
POWER RATING
950 mW
7.6 mW/°C
608 mW
—
1375 mW
11.0 mW/°C
880 mW
275 mW
11.0 mW/°C
880 mW
275 mW
N
1150 mW
9.2 mW/°C
736 mW
—
W
1000 mW
8.0 mW/°C
640 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 input voltage,
High-level
voltage VIH
Low level input voltage,
Low-level
voltage VIL
High-level output current, IOH
Low level output current,
Low-level
current IOL
NOM
4.5
Driver or strobe
Receiver
SN75138
MAX
MIN
NOM
MAX
5.5
4.75
5
5.25
2
2
3.2
2.9
0.8
0.8
Receiver
1.5
1.8
– 400
– 400
100
100
16
16
Driver output
Receiver output
Operating free-air temperature, TA
– 55
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
125
0
V
V
Driver or strobe
Receiver output
UNIT
70
V
µA
mA
°C
3
SN55138, SN75138
QUADRUPLE BUS TRANSCEIVERS
SLLS079B – SEPTEMBER 1973 – REVISED MAY 1995
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
TEST CONDITIONS†
PARAMETER
MIN
VIK
Input clamp
voltage
Driver or
strobe
VCC = MIN,
II = – 12 mA
VOH
High-level
output
voltage
Receiver
VCC = MIN,
VIL(R) = VIL max,
VIH(S) = 2 V,
IOH = – 400 µA
Driver
VOL
Low-level
out
ut
output
voltage
VCC = MIN,
VIL(S) = 0.8 V,
VIH(D) = 2 V,
IOL = 100 mA
Receiver
VCC = MIN,
VIH(S) = 2 V,
VIH(R) = VIH min,
IOL = 16 mA
Driver or
strobe
VCC = MAX,
Driver or
strobe
II(max)
Input current
at maximum
input voltage
IIH
High-level
g
input current
IIL
Low-level
input current
SN75138
TYP‡ MAX
–1.5
2.4
3.5
–1.5
2.4
3.5
UNIT
V
V
0.45
0.4
0.4
VI = VCC
1
1
VCC = MAX,
VI = 2.4 V
40
40
Receiver
VCC = 5 V,
VI(S) = 2 V
VI(R) = 4.5 V,
25
300
25
300
Driver or
strobe
VCC = MAX,
VI = 0.4 V
–1
–1.6
–1
–1.6
mA
Receiver
VCC = MAX,
VI(S) = 2 V
VI(R) = 0.45 V,
– 50
µA
VI = 4
4.5
5V
15
1.5
mA
– 55
mA
Input current
with power
ower
off
Receiver
VCC = 0
0,
IOS
Short-circuit
output
out
ut
current§
Receiver
VCC = MAX
All driver
outputs low
VCC = MAX,
VI(S) = 0.8 V
All driver
outputs
out
uts
high
VCC = MAX,
VI(R) = 3.5 V,
VI(S) = 2 V,
V
Receiver outputs open
ICC
MIN
0.45
II(
ff)
I(off)
Supply
current
SN55138
TYP‡ MAX
V
mA
µA
– 50
11
1.1
– 20
15
1.5
– 55
VI(D) = 2 V,
11
1.1
– 18
50
65
50
65
42
55
42
55
mA
† 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, VCC = 5 V, TA = 25°C
PARAMETER¶
FROM
(INPUT)
TO
(OUTPUT)
tPLH
tPHL
Driver
Driver
tPLH
tPHL
Strobe
Driver
tPLH
tPHL
Receiver
Receiver
TEST CONDITIONS
pF
CL = 50 pF,
CL = 15 pF
RL = 50 Ω
Ω,
RL = 400 Ω
Ω,
¶ 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
See Figure 1
See Figure 2
MIN
TYP
MAX
15
24
14
24
18
28
22
32
7
15
8
15
UNIT
ns
ns
ns
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
3V
1.5 V
1.5 V
Strobe
Input
0V
tPLH
tPHL
VOH
2.5 V
2.5 V
Driver
Output
VOL
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.
Figure 1. Propagation Delay Times From Data and Strobe Inputs
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
5
SN55138, SN75138
QUADRUPLE BUS TRANSCEIVERS
SLLS079B – SEPTEMBER 1973 – REVISED MAY 1995
PARAMETER MEASUREMENT INFORMATION
Test
Point
VCC
RL
From Output
Under Test
See Note C
CL
(see Note B)
TEST CIRCUIT
4V
Receiver
Input
2.5 V
2.5 V
0V
tPLH
tPHL
VOH
Receiver
Output
1.5 V
1.5 V
VOL
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.
Figure 2. Propagation Delay Times From Receiver Input
6
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
SN55138, SN75138
QUADRUPLE BUS TRANSCEIVERS
SLLS079B – SEPTEMBER 1973 – REVISED MAY 1995
TYPICAL CHARACTERISTICS†
DRIVER TRANSFER CHARACTERISTICS
DRIVER TRANSFER CHARACTERISTICS
6
6
5
VO(D)
VO(D) – Driver Output Voltage – V
VO(D)
VO(D) – Driver Output Voltage – V
VCC = 5.5 V
VCC = 5 V
VI(S) = 0.8 V
4
TA = 25°C
3
TA = 125°C
TA = – 55°C
2
1
0
0
1
2
3
VCC = 4.5 V
4
3
2
1
0
4
0
1
VI(D) – Driver Input Voltage – V
5
5
VO(D)
VO(D) – Driver Output Voltage – V
VO(D)
VO(D) – Driver Output Voltage – V
6
TA = 125°C
4
TA = 25°C
3
VCC = 5 V
VI(D) = 2 V
Load = 50 Ω to VCC
1
VCC = 5.5 V
VCC = 5 V
VCC = 4.5 V
4
3
VI(D) = 2 V
TA = 25°C
Load = 50 Ω to VCC
2
1
TA = – 55°C
VCC = 5.5 V
0
0
2
4
STROBE-TO-DRIVER OUTPUT
TRANSFER CHARACTERISTICS
6
1
3
Figure 4
STROBE-TO-DRIVER OUTPUT
TRANSFER CHARACTERISTICS
0
2
VI(D) – Driver Input Voltage – V
Figure 3
2
VI(S) = 0.8 V
TA = 25°C
Load = 50 Ω to VCC
VCC = 5 V
5
3
4
0
1
VCC = 4.5 V
2
3
4
VI(S) – Strobe Input Voltage – V
VI(S) – Strobe Input Voltage – V
Figure 6
Figure 5
† Data for temperatures below 0°C and above 70°C is applicable to SN55138 circuits only.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
7
SN55138, SN75138
QUADRUPLE BUS TRANSCEIVERS
SLLS079B – SEPTEMBER 1973 – REVISED MAY 1995
TYPICAL CHARACTERISTICS†
RECEIVER TRANSFER CHARACTERISTICS
VCC = 5 V
Load:
R
10 kΩ
4
All Diodes
1N914
3
2
TA = 25°C
1
TA = 25°C
Load:
5V
400 Ω
5
RECEIVER TRANSFER CHARACTERISTICS
6
VO(R)
VO(R) – Receiver Output Voltage – V
VO(R)
VO(R) – Receiver Output Voltage – V
6
TA = – 55°C
TA = 125°C
0
400 Ω
5
R
VCC = 5.5 V
VCC = 5 V
All Diodes
1N914
VCC = 4.5 V
3
2
1
1
2
3
VI(R) – Receiver Input Voltage – V
0
4
1
2
3
VI(R) – Receiver Input Voltage – V
Figure 7
HIGH-LEVEL OUTPUT VOLTAGE
vs
HIGH-LEVEL OUTPUT CURRENT (RECEIVER)
5
5
VOH – High–Level Output Voltage – V
VCC = 5 V
4
TA = 125°C
TA = 25°C
3
2
4
Figure 8
HIGH-LEVEL OUTPUT VOLTAGE
vs
HIGH-LEVEL OUTPUT CURRENT (RECEIVER)
VOH – High–Level Output Voltage – V
10 kΩ
4
0
0
TA = – 55°C
1
VI(R) = 0.8 V
TA = 25°C
4
3
VCC = 5.5 V
2
VCC = 5 V
1
VCC = 4.5 V
0
0
0
5
10
15
20
25
30
35
40
0
IOH(R) – High-Level Output Current – mA
5
10
15
20
Figure 10
† Data for temperatures below 0°C and above 70°C is applicable to SN55138 circuits only.
POST OFFICE BOX 655303
25
30
35
IOH(R) – High-Level Output Current – mA
Figure 9
8
5V
• DALLAS, TEXAS 75265
40
SN55138, SN75138
QUADRUPLE BUS TRANSCEIVERS
SLLS079B – SEPTEMBER 1973 – REVISED MAY 1995
TYPICAL CHARACTERISTICS†
LOW-LEVEL OUTPUT VOLTAGE
vs
LOW-LEVEL OUTPUT CURRENT (RECEIVER)
Á
Á
1.2
VCC = 4.5 V
VI(R) = 3.5 V
1
VOL(R)
VOL – Low-Level Output Voltage – V
VOL(R)
VOL – Low-Level Output Voltage – V
1.2
TA = – 55°C
0.8
LOW-LEVEL OUTPUT VOLTAGE
vs
LOW-LEVEL OUTPUT CURRENT (DRIVER)
TA = 125°C
0.6
TA = 25°C
0.4
0.2
VCC = 4.5 V
VI(D) = 2 V
VI(S) = 0.8 V
1
TA = – 55°C
0.8
0.6
TA = 125°C
0.4
0.2
0
0
0
10
20
30
40
50
0
60
50
100
150
200
250
300
IOL(D) – Low-Level Output Current – mA
IOL(R) – Low-Level Output Current – mA
Figure 11
Figure 12
RECEIVER INPUT CURRENT
vs
RECEIVER INPUT VOLTAGE
RECEIVER INPUT CURRENT
vs
RECEIVER INPUT VOLTAGE
1.6
1.6
VCC = 5 V
VI(S) = 2 V
1.4
TA = 125°C, 25°C
III(R)
I(R) – Receiver Input Current – mA
III(R)
I(R) – Receiver Input Current – mA
TA = 25°C
1.2
TA = – 55°C
1
0.8
0.6
0.4
VI(S) = 2 V
TA = 25°C
1.4
1.2
1
0.8
VCC = 4.5 V
0.6
VCC = 5 V
0.4
VCC = 5.5 V
0.2
0.2
TA = 125°C
ÁÁ
ÁÁ
ÁÁ
ÁÁ
ÁÁ
TA = 25°C, – 55°C
0
0
0
1
2
3
4
5
VI(R) – Receiver Input Voltage – V
6
0
Figure 13
1
2
3
4
5
VI(R) – Receiver Input Voltage – V
6
Figure 14
† Data for temperatures below 0°C and above 70°C is applicable to SN55138 circuits only.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
9
SN55138, SN75138
QUADRUPLE BUS TRANSCEIVERS
SLLS079B – SEPTEMBER 1973 – REVISED MAY 1995
TYPICAL CHARACTERISTICS†
SUPPLY CURRENT
vs
SUPPLY VOLTAGE
(ALL DRIVER OUTPUTS LOW)
SUPPLY CURRENT
vs
SUPPLY VOLTAGE
80
80
VI(S) = 0.8 V
VI(D) = 2 V
Driver Loads = 1 kΩ to 5 V
60
TA = 25°C
50
TA = 25°C
VI(S) = 0.8 V
Driver Loads = 1 kΩ to 5 V
R Output Open
70
IICC
CC – Supply Current – mA
I CC
ICC – Supply Current – mA
70
TA = 125°C
40
30
TA = – 55°C
20
10
60
4 Driver Inputs at 2 V
50
2 Driver Inputs at 2 V,
2 Driver Inputs at 0.8 V
40
4 Driver Inputs at 0.8 V
30
20
10
0
0
1
2
3
4
5
6
7
0
8
1
0
VCC – Supply Voltage – V
Figure 15
30
tPHL(S-D)
tPLH(S-D)
tPLH(D-D)
16
tPHL(D-D)
12
tPLH(R-R)
8
tPHL(R-R)
40
Propagation Delay Times – ns
Propagation Delay Times – ns
VCC = 5 V
Driver Load: CL = 50 pF, RL = 50 Ω, See Figure 1
Receiver Load: CL = 15 pF, RL = 400 Ω,
See Figure 2
20
8
PROPAGATION DELAY TIMES
vs
SUPPLY VOLTAGE
32
24
7
Figure 16
PROPAGATION DELAY TIMES
vs
FREE-AIR TEMPERATURE
28
2
3
4
5
6
VCC – Supply Voltage – V
20
ÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁ
TA = 25°C
Driver Load: CL = 50 pF, RL = 50 Ω, See Figure 1
Receiver Load: CL = 15 pF, RL = 400 Ω,
See Figure 2
tPHL(S-D)
tPLH(S-D)
tPLH(D-D)
15
tPHL(D-D)
10
tPHL(R-R)
tPLH(R-R)
5
4
0
– 6 – 40 – 20
0
0
20
40
60
80 100 120 140
4.5 4.6 4.7 4.8 4.9
TA – Free-Air Temperature – °C
Figure 17
Figure 18
† Data for temperatures below 0°C and above 70°C is applicable to SN55138 circuits only.
10
5
POST OFFICE BOX 655303
5.1 5.2 5.3 5.4 5.5
VCC – Supply Voltage – V
• DALLAS, TEXAS 75265
SN55138, SN75138
QUADRUPLE BUS TRANSCEIVERS
SLLS079B – SEPTEMBER 1973 – REVISED MAY 1995
TYPICAL CHARACTERISTICS
DRIVER
RECEIVER
PROPAGATION DELAY TIMES
vs
LOAD CAPACITANCE
PROPAGATION DELAY TIMES
vs
LOAD CAPACITANCE
16
30
VCC = 5 V
RL = 400 Ω, See Figure 2
TA = 25°C
t pd – Propagation Delay Times – ns
t pd – Propagation Delay Times – ns
14
25
tPHL(S-D)
tPLH(S-D)
20
tPHL(D-D)
15
tPLH(D-D)
10
VCC = 5 V
RL = 50 W,
See Figure 1
TA = 25_C
5
12
tPHL(R-R)
10
0
0
20
tPLH(R-R)
8
6
4
2
0
40 60 80 100 120 140 160 180 200
CL – Load Capacitance – pF
0
10
Figure 19
20
30
40
50
60
CL – Load Capacitance – pF
70
80
Figure 20
APPLICATION INFORMATION
5V
5V
P
100 Ω
100 Ω
A
50 ft Belden #8795
100-Ω Telephone Cable
B
1/4 SN55138
A
D
C
1/4 SN55138
3V
2V
C
0V
2V
0V
5V
4V
B
2V
5V
4V
4V
D
0V
2V
0V
TYPICAL VOLTAGE WAVEFORMS
Figure 21. Point-to-Point Communication Over 50 Feet of Twisted Pair at 5 MHz
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
11
SN55138, SN75138
QUADRUPLE BUS TRANSCEIVERS
SLLS079B – SEPTEMBER 1973 – REVISED MAY 1995
APPLICATION INFORMATION
5V
5V
100 Ω
100 Ω
50 ft
100 ft
100 ft
250 ft
A
1/4 SN55138
1/4 SN55138
1/4 SN55138
1/4 SN55138
B
C
P
Belden #8795
Telephone Cable
or Equivalent
E
1/4 SN55138
D
4V
3V
2V
A
2V
D
0V
0V
4V
4V
2V
B
2V
E
0V
0V
4V
2V
C
0V
TYPICAL VOLTAGE WAVEFORMS
Figure 22. Party-Line Communication on 500 Feet of Twisted Pair at 1 MHz
5V
5V
100 Ω
A
1000 ft RG-53
100 Ω
or Equivalent
D
1/4 SN55138
A
B
C
1/4 SN55138
5V
4V
3V
2V
C
2V
0V
0V
5V
4V
B
2V
D
0V
0V
TYPICAL VOLTAGE WAVEFORMS
Figure 23. Point-to-Point Communication Over 1000 Feet of Coaxial Cable at 1 MHz
12
POST OFFICE BOX 655303
3V
2V
• DALLAS, TEXAS 75265
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