SLLS123B − D2845, JUNE 1984 − REVISED FEBRUARY 1993
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D OR P PACKAGE
(TOP VIEW)
Meets EIA Standards RS-422A, RS423A,
and CCITT Recommendations V.11 and X.27
Bus Voltage Range . . . −7 V to 12 V
Positive and Negative Current Limiting
Driver Output Capability . . . 60 mA Max
Driver Thermal Shutdown Protection
Receiver Input Impedance . . . 12 kΩ Min
Receiver Input Sensitivity . . . ± 200 mV
Receiver Input Hysteresis . . . 50 mV Typ
Operates From Single 5-V Supply
Low Power Requirements
VCC
R
D
GND
1
8
2
7
3
6
4
5
A
B
Z
Y
NOT RECOMMENDED FOR NEW DESIGN
logic symbol
description
R
The SN75179A driver and bus receiver circuit is a
monolithic integrated device designed for
balanced transmission line applications, and
meets EIA Standards RS-422A, RS-423A, and
CCITT Recommendations V.11 and X.27. It is
designed to improve the performance of data
communications over long bus lines.
D
8
2
7
6
3
5
A
B
Z
Y
logic diagram
The SN75179A features positive- and negativecurrent limiting for the driver and receiver. The
receiver features high input impedance, input
hysteresis for increased noise immunity, and input
sensitivity of ± 200 mV over a common-mode input
voltage range of −12 V to 12 V.
R
D
8
2
7
6
3
5
A
B
Z
Y
The driver provides thermal shutdown for
protection from line fault conditions. Thermal
shutdown is designed to occur at a junction
temperature of approximately 150°C. The device
is designed to drive current loads of up to 60 mA
maximum.
The SN75179A is characterized for operation
from 0°C to 70°C.
Function Tables
DRIVER
INPUT
D
RECEIVER
OUTPUTS
Y
Z
H
L
H
L
H = high level,
L
H
L = low level,
DIFFERENTIAL INPUTS
A−B
OUTPUT
R
VID ≥ 0.2 V
−0.2 V < VID < 0.2 V
VID ≤ −0.2 V
H
?
L
? = indeterminate
Copyright 1993, Texas Instruments Incorporated
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•
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•
2−1
SLLS123B − D2845, JUNE 1984 − REVISED FEBRUARY 1993
schematics of inputs and outputs
EQUIVALENT DRIVER OR ENABLE INPUT
TYPICAL OF ALL DRIVER OUTPUTS
VCC
VCC
Req
Input
Output
Driver input: Req = 3 kΩ NOM
Enable inputs: Req = 8 kΩ NOM
GND
TYPICAL OF ALL RECEIVER OUTPUTS
EQUIVALENT OF EACH RECEIVER INPUT
VCC
85 Ω
NOM
VCC
960 Ω
NOM
Input
16.8 kΩ
960 Ω
NOM
NOM
Output
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Voltage range at any bus terminal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −10 V to 15 V
Differential input voltage (see Note 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 25 V
Continuous total dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table
Operating free-air temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
NOTES: 1. All voltage values, except differential input voltage, are with respect to network ground terminal.
2. Differential-input voltage is measured at the noninverting input with respect to the corresponding inverting input.
DISSIPATION RATING TABLE
2−2
PACKAGE
TA ≤ 25°C
POWER RATING
DERATING FACTOR
ABOVE TA = 25°C
TA = 70°C
POWER RATING
D
725 mW
5.8 mW/°C
464 mW
P
1000 mW
8.0 mW/°C
640 mW
•
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•
SLLS123B − D2845, JUNE 1984 − REVISED FEBRUARY 1993
recommended operating conditions
Supply voltage, VCC
High-level input voltage, VIH
Driver
Low-level input voltage, VIL
Driver
MIN
NOM
MAX
UNIT
4.5
5
5.25
V
2
V
−7 †
Common-mode input voltage, VIC
Differential input voltage, VID
Driver
High-level output current, IOH
Receiver
Driver
Low-level output current, IOL
0.8
V
12
V
± 12
V
−60
mA
−400
µA
60
Receiver
8
mA
Operating free-air temperature, TA
0
70
°C
† The algebraic convention, where the less-positive (more-negative) limit is designated minimum, is used in this data sheet for common-mode input
voltage and threshold voltage.
DRIVER SECTION
electrical characteristics over recommended ranges of supply voltage and operating free-air
temperature (unless otherwise noted)
PARAMETER
VIK
Input clamp voltage
VOH
High-level output voltage
VOL
Low-level output voltage
|VOD1|
Differential output voltage
|VOD2|
Differential output voltage
∆|VOD|
Change in magnitude of differential
output voltage§
VOC
Common-mode output voltage¶
∆|VOC|
Change in magnitude of
common-mode output voltage§
IO
IIH
Output current with power off
IIL
Low-level input current
IOS
High-level input current
Short-circuit output current
TEST CONDITIONS
II = − 18 mA
VIH = 2 V,
IOH = − 33 mA
VIH = 2 V,
IOH = 33 mA
MIN
TYP‡
MAX
UNIT
−1.5
V
VIL = 0.8 V,
3.7
V
VIL = 0.8 V,
1.1
V
IO = 0
RL = 100 Ω,
2 VOD2
See Figure 13
2
2.7
RL = 54 Ω,
See Figure 13
1.5
2.4
V
V
± 0.2
V
3
V
± 0.2
V
± 100
µA
20
µA
VI = 0.4 V
VO = − 7 V
−400
µA
VO = VCC
VO = 12 V
250
RL = 54 Ω or 100 Ω,
VCC = 0,
VI = 2.4 V
See FIgure 13
VO = − 7 V to 12 V
−250
mA
500
ICC
Supply current (total package)
No load
50
mA
‡ All typical values are at VCC = 5 V and TA = 25°C.
§ ∆|VOD| and ∆|VOC| are the changes in magnitude of VOD and VOC, respectively, that occur when the input is changed from a high level to a low
level.
¶ In EIA Standard RS-422A, VOC, which is the average of the two output voltages with respect to ground, is called output offset voltage, VOS.
switching characteristics, VCC = 5 V, TA = 25°C
PARAMETER
tdD
ttD
Differential-output delay time
Differential-output transition time
TEST CONDITIONS
RL = 60 Ω
Ω,
•
See Figure 3
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•
MIN
TYP
MAX
UNIT
40
60
ns
65
95
ns
2−3
SLLS123B − D2845, JUNE 1984 − REVISED FEBRUARY 1993
RECEIVER SECTION
electrical characteristics over recommended ranges of common-mode input voltage, supply
voltage, and operating free-air temperature (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
VT+
VT−
Positive-going threshold voltage
Negative-going threshold voltage
VO = 2.7 V,
VO = 0.5 V,
Vhys
Hysteresis (VT+ − VT−)
See Figure 9
VOH
High-level output voltage
VID = 200 mV,
See Figure 2
IOH = − 400 µA,
VOL
Low-level output voltage
VID = − 200 mV,
IOL = 8 mA,
VI = 12 V
II
Line input current
ri
Input resistance
IO = − 0.4 mA
IO = 8 mA
TYP†
MAX
0.2
−0.2‡
V
V
50
Other input at 0 V,
See Note 3
UNIT
mV
2.7
V
See Figure 2
0.45
V
1
VI = − 7 V
−0.8
12
mA
kΩ
IOS
Short-circuit output current
−15
−85
mA
ICC
Supply current ( total package)
No load
50
mA
† All typical values are at VCC = 5 V, TA = 25°C.
‡ The algebraic convention, where the less-positive (more-negative) limit is designated minimum, is used in this data sheet for common-mode input
voltage and threshold voltage levels only.
NOTE 3: Refer to EIA Standard RS-422A for exact conditions.
switching characteristics, VCC = 5 V, TA = 25°C
PARAMETER
tPLH
tPHL
2−4
TEST CONDITIONS
Propagation delay time, low-to-high-level output
Propagation delay time, high-to-low-level output
VID = − 1.5 V to 1.5 V,
See Figure 5
•
CL = 15 pF,
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•
MIN
TYP
MAX
26
35
UNIT
ns
27
35
ns
SLLS123B − D2845, JUNE 1984 − REVISED FEBRUARY 1993
PARAMETER MEASUREMENT INFORMATION
RL
2
VOD2
RL
2
VID
VOH
VOC
+IOL
VOL
Figure 1. Driver VOD and VOC
−IOH
Figure 2. Receiver VOH and VOL
3V
Input
CL
Generator
(see Note A)
50 Ω
1.5 V
1.5 V
0V
RL = 60 Ω
Output
tdD
tdD
Output
CL = 15 pF
(see Note B)
≈ 2.5 V
50%
90%
50%
10%
≈ − 2.5 V
ttD
VOLTAGE WAVEFORMS
ttD
TEST CIRCUIT
Figure 3. Driver Differential-Output Delay and Transition Times
3V
Input
2.3 V
1.5 V
1.5 V
0V
RL = 27 Ω
S1
Output
Generator
(see Note A)
50 Ω
tPLH
tPHL
VOH
Y Output
2.3 V
VOL
CL = 50 pF
(see Note B)
tPHL
tPLH
VOH
2.3 V
Z Output
VOL
TEST CIRCUIT
VOLTAGE WAVEFORMS
Figure 4. Driver Test Circuit and Voltage Waveforms
3V
Input
Generator
(see Note A)
1.5 V
1.5 V
0V
50 Ω
Output
1.5 V
CL = 15 pF
(see Note B)
tPHL
tPLH
1.3 V
Output
TEST CIRCUIT
VOH
1.3 V
VOL
VOLTAGE WAVEFORMS
Figure 5. Receiver Test Circuit and Voltage Waveforms
NOTES: A. The input pulse is supplied by a generator having the following characteristics: PRR = 1 MHz, 50% duty cycle, tr ≤ 6 ns, tf ≤ 6 ns,
ZO = 50 Ω.
B. CL includes probe and jig capacitance.
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•
2−5
SLLS123B − D2845, JUNE 1984 − REVISED FEBRUARY 1993
TYPICAL CHARACTERISTICS
DRIVER HIGH-LEVEL OUTPUT VOLTAGE
vs
DRIVER HIGH-LEVEL OUTPUT CURRENT
DRIVER LOW-LEVEL OUTPUT VOLTAGE
vs
DRIVER LOW-LEVEL OUTPUT CURRENT
5
VCC = 5 V
TA = 25°C
4.5
VCC = 5 V
TA = 25°C
4.5
VOL − Low-Level Output Voltage − V
VOH − High-Level Output Voltage − V
5
4
3.5
3
2.5
2
1.5
1
4
3.5
3
2.5
2
1.5
1
0.5
0.5
0
0
0
−20
−40
−60
−80
−100
0
−120
20
40
Figure 6
100
120
Figure 7
DRIVER DIFFERENTIAL OUTPUT VOLTAGE
vs
DRIVER OUTPUT CURRENT
RECEIVER OUTPUT VOLTAGE
vs
DIFFERENTIAL INPUT VOLTAGE
4
5
IO = 0
TA = 25°C
VIC =
−12 V
VIC =
0V
VIC =
12 V
VT−
VT+
VT−
VT−
VT+
VCC = 5 V
VCC = 5 V
TA = 25°C
3.5
4
VO
V
O − Output Voltage − V
VOD
V
DD − Differential Output Voltage − V
80
IOH − Low-Level Output Current − mA
IOH − High-Level Output Current − mA
3
2.5
2
1.5
ÁÁ
ÁÁ
ÁÁ
3
VT+
2
1
1
0.5
0
0
10
20
30
40
50
60
70
80
0
−125 −100 −75 −50 −25
90 100
IO − Output Current − mA
0
25
50
75 100 125
VID − Differential Input Voltage − mV
Figure 8
2−6
60
Figure 9
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•
SLLS123B − D2845, JUNE 1984 − REVISED FEBRUARY 1993
TYPICAL CHARACTERISTICS
RECEIVER HIGH-LEVEL OUTPUT VOLTAGE
vs
HIGH-LEVEL OUTPUT CURRENT
RECEIVER HIGH-LEVEL OUTPUT VOLTAGE
vs
FREE-AIR TEMPERATURE
5
VID = 0.2 V
TA = 25°C
VOH − High-Level Output Voltage − V
VOH − High-Level Output Voltage − V
5
4
3
VCC = 5.25 V
2
VCC = 5 V
VCC = 4.75 V
1
VCC = 5 V
VID = 0.2 V
IOH = − 440 µA
4
3
2
1
0
0
0
−10
−20
−30
−40
10
0
−50
20
30
Figure 10
50
60
70
80
Figure 11
RECEIVER LOW-LEVEL OUTPUT VOLTAGE
vs
RECEIVER LOW-LEVEL OUTPUT CURRENT
RECEIVER LOW-LEVEL OUTPUT VOLTAGE
vs
FREE-AIR TEMPERATURE
0.6
0.6
VOL− Low-Level Output Voltage − V
VCC = 5 V
TA = 25°C
VOL− Low-Level Output Voltage − V
40
TA − Free-Air Temperature − °C
IOH − High-Level Output Current − mA
0.5
0.4
0.3
0.2
0.1
0.5
ÁÁÁÁÁ
ÁÁÁÁÁ
ÁÁÁÁÁ
VCC = 5 V
VID = − 200 mV
IOL = 8 mA
0.4
0.3
0.2
0.1
0
0
0
5
10
15
20
25
0
30
10
20
30
40
50
60
70
80
TA − Free-Air Temperature − °C
IOL − Low-Level Output Current − mA
Figure 12
Figure 13
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2−7
PACKAGE OPTION ADDENDUM
www.ti.com
7-Jun-2010
PACKAGING INFORMATION
Orderable Device
SN75179AP
Status
(1)
OBSOLETE
Package Type Package
Drawing
PDIP
P
Pins
Package Qty
Eco Plan
8
TBD
(2)
Lead/
Ball Finish
Call TI
MSL Peak Temp
(3)
Samples
(Requires Login)
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.
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Addendum-Page 1
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