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DS26C31M, DS26C31T
SNLS375C – JUNE 1998 – REVISED JANUARY 2015
DS26C31x CMOS Quad Tri-State Differential Line Driver
1 Features
•
•
•
•
•
1
3 Description
The DS26C31 device is a quad differential line driver
designed for digital data transmission over balanced
lines. The DS26C31T meets all the requirements of
EIA standard RS-422 while retaining the low power
characteristics of CMOS. The DS26C31M is
compatible with EIA standard RS-422; however, one
exception in test methodology is taken
(2)
. This
enables the construction of serial and terminal
interfaces
while
maintaining
minimal
power
consumption.
The DS26C31 accepts TTL or CMOS input levels and
translates these to RS-422 output levels. This part
uses special output circuitry that enables the drivers
to power down without loading down the bus. This
device has enable and disable circuitry common to all
four drivers. The DS26C31 is pin compatible to the
AM26LS31 and the DS26LS31.
All inputs are protected against damage due to
electrostatic discharge by diodes to V
CC
and ground.
Device Information
(1)
PART NUMBER
DS26C31M
DS26C31T
PACKAGE
SNLS3759577
PDIP (16)
SNLS3759577
PDIP (16)
BODY SIZE (NOM)
9.90 mm × 3.91 mm
19.304 mm × 6.35 mm
9.90 mm × 3.91 mm
19.304 mm × 6.35 mm
•
•
•
•
•
TTL Input Compatible
Typical Propagation Delays: 6 ns
Typical Output Skew: 0.5 ns
Outputs Will Not Load Line When V
CC
= 0 V
DS26C31T Meets the Requirements of EIA
Standard RS-422
Operation From Single 5-V Supply
Tri-State Outputs for Connection to System Buses
Low Quiescent Current
Available in Surface Mount
Mil-Std-883C Compliant
2 Applications
Differential Line Driver for RS-422 Applications
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
(2) The DS26C31M (−55°C to 125°C) is tested with V
OUT
between 6 V and 0 V while RS-422A condition is 6 V and
−0.25
V.
4 Device Logic Diagram
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
DS26C31M, DS26C31T
SNLS375C – JUNE 1998 – REVISED JANUARY 2015
www.ti.com
Table of Contents
1
2
3
4
5
6
7
Features
..................................................................
Applications
...........................................................
Description
.............................................................
Device Logic Diagram
...........................................
Revision History.....................................................
Pin Configuration and Functions
.........................
Specifications.........................................................
7.1
7.2
7.3
7.4
7.5
Absolute Maximum Ratings ......................................
Recommended Operating Conditions.......................
DC Electrical Characteristics ....................................
Switching Characteristics .........................................
Comparison Table of Switching Characteristics into
“LS-Type” Load ..........................................................
7.6 Typical Characteristics ..............................................
1
1
1
1
2
3
4
4
4
5
6
6
7
9.2 Functional Block Diagram .......................................
13
9.3 Feature Description.................................................
13
9.4 Device Functional Modes........................................
13
10 Application and Implementation........................
14
10.1 Application Information..........................................
14
10.2 Typical Application ................................................
14
11 Power Supply Recommendations
.....................
16
12 Layout...................................................................
16
12.1 Layout Guidelines .................................................
16
12.2 Layout Example ....................................................
16
13 Device and Documentation Support
.................
17
13.1
13.2
13.3
13.4
Related Links ........................................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
17
17
17
17
8
9
Parameter Measurement Information
................
11
Detailed Description
............................................
13
9.1 Overview .................................................................
13
14 Mechanical, Packaging, and Orderable
Information
...........................................................
17
5 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision B (April 2013) to Revision C
•
Page
Added
Feature Description
section,
Device Functional Modes, Application and Implementation
section,
Power
Supply Recommendations
section,
Layout
section,
Device and Documentation Support
section, and
Mechanical,
Packaging, and Orderable Information
section ......................................................................................................................
1
Changes from Revision A (April 2013) to Revision B
•
Page
Changed layout of National Data Sheet to TI format .............................................................................................................
9
2
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Copyright © 1998–2015, Texas Instruments Incorporated
Product Folder Links:
DS26C31M DS26C31T
DS26C31M, DS26C31T
www.ti.com
SNLS375C – JUNE 1998 – REVISED JANUARY 2015
6 Pin Configuration and Functions
D, NFG Package
16 Pins
Top View
NAJ Package
20 Pins
Top View
Pin Functions
PIN
NAME
CHANNEL A
OUTPUTS (–, +)
CHANNEL B
OUTPUTS (–, +)
CHANNEL C
OUTPUTS (–, +)
CHANNEL D
OUTPUTS (–, +)
INPUT A
INPUT B
INPUT C
INPUT D
CONTROL PINS
ENABLE
ENABLE
POWER
GND
VCC
(1)
8
16
—
—
GND Pin
Supply pin, provide 5 V supply
4
12
I
I
Logic-high ENABLE Control
Logic-low ENABLE Control
NO.
(1)
DIFFERENTIAL SIGNALING I/O
3, 2
5, 6
11, 10
13, 14
1
7
9
15
O
O
O
O
I
I
I
I
Channel A inverting and non-inverting differential driver outputs
Channel B inverting and non-inverting differential driver outputs
Channel C inverting and non-inverting differential driver outputs
Channel D inverting and non-inverting differential driver outputs
TTL/CMOS compatible input for channel A
TTL/CMOS compatible input for channel B
TTL/CMOS compatible input for channel C
TTL/CMOS compatible input for channel D
I/O
DESCRIPTION
Pin numbers correspond to PDIP and SOIC packages.
Copyright © 1998–2015, Texas Instruments Incorporated
Submit Documentation Feedback
3
Product Folder Links:
DS26C31M DS26C31T
DS26C31M, DS26C31T
SNLS375C – JUNE 1998 – REVISED JANUARY 2015
www.ti.com
7 Specifications
7.1 Absolute Maximum Ratings
(1) (2) (3)
MIN
Supply Voltage (V
CC
)
DC Input Voltage (V
IN
)
DC Output Voltage (V
OUT
)
Clamp Diode Current (I
IK
, I
OK
)
DC Output Current, per pin (I
OUT
)
DC V
CC
or GND Current, per pin (I
CC
)
Max Power Dissipation (P
D
) at 25°C
(4)
Ceramic “NFE” package
Plastic “NFG” package
SOIC “D” package
Ceramic “NAD” package
Ceramic “NAJ” package
Lead Temperature (T
L
)
Storage Temperature, T
stg
(1)
(2)
(3)
(4)
(Soldering, 4 s)
−65
2419
1736
1226
1182
2134
260
150
mW
mW
mW
mW
mW
°C
°C
−0.5
−1.5
−0.5
–20
–150
MAX
7
V
CC
+1.5
7
20
150
UNIT
V
V
V
mA
mA
Stresses beyond those listed under
Absolute Maximum Ratings
may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under
Recommended
Operating Conditions.
Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
Unless otherwise specified, all voltages are referenced to ground. All currents into device pins are positive, all currents out of device
pins are negative.
If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and
specifications.
Ratings apply to ambient temperature at 25°C. Above this temperature derate NFG package at 13.89 mW/°C, NFE package 16.13
mW/°C, D package 9.80 mW/°C, NAJ package 12.20 mW/°C, and NAD package 6.75 mW/°C.
7.2 Recommended Operating Conditions
MIN
Supply Voltage (V
CC
)
DC Input or Output Voltage
Operating Temperature Range (T
A
)
Input Rise or Fall Times (t
r
, t
f
)
(V
IN
, V
OUT
)
DS26C31T
DS26C31M
4.50
0
−40
−55
MAX
5.50
V
CC
85
125
500
UNIT
V
V
°C
°C
ns
4
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Copyright © 1998–2015, Texas Instruments Incorporated
Product Folder Links:
DS26C31M DS26C31T
DS26C31M, DS26C31T
www.ti.com
SNLS375C – JUNE 1998 – REVISED JANUARY 2015
7.3 DC Electrical Characteristics
V
CC
= 5 V ± 10% (unless otherwise specified)
(1)
PARAMETER
V
IH
V
IL
V
OH
V
OL
V
T
|V
T
|
−
|V
T
|
V
OS
|V
OS
−
V
OS
|
I
IN
I
CC
High Level Input Voltage
Low Level Input Voltage
High Level Output Voltage
Low Level Output Voltage
Differential Output Voltage
Difference In Differential Output
Common Mode Output Voltage
Difference In Common Mode
Output
Input Current
Quiescent Supply Current
(3)
TEST CONDITIONS
MIN
2.0
TYP
MAX
0.8
UNIT
V
V
V
V
IN
= V
IH
or V
IL
,
I
OUT
=
−20
mA
V
IN
= V
IH
or V
IL
,
I
OUT
= 20 mA
R
L
= 100
Ω
See
(2)
R
L
= 100
Ω
See
(2)
R
L
= 100
Ω
See
(2)
R
L
= 100
Ω
See
(2)
2.5
3.4
0.3
0.5
V
V
2.0
3.1
0.4
1.8
3.0
0.4
±1.0
200
0.8
200
0.8
±0.5
500
2.0
500
2.1
±5.0
−150
100
−100
100
−100
V
V
V
μA
μA
mA
μA
mA
μA
mA
μA
μA
μA
μA
V
IN
= V
CC
, GND, V
IH
, or V
IL
DS26C31T
I
OUT
= 0
μA
DS26C31M
I
OUT
= 0
μA
V
IN
= V
CC
or GND
V
IN
= 2.4 V or 0.5 V
(3)
V
IN
= V
CC
or GND
V
IN
= 2.4 V or 0.5 V
(3)
I
OZ
TRI-STATE Output Leakage
Current
V
OUT
= V
CC
or GND
ENABLE = V
IL
ENABLE = V
IH
V
IN
= V
CC
or GND
(2) (4)
DS26C31T
V
CC
= 0 V
DS26C31M
V
CC
= 0 V
V
OUT
= 6 V
V
OUT
=
−0.25
V
V
OUT
= 6 V
V
OUT
= 0 V
(5)
−30
I
SC
I
OFF
Output Short Circuit Current
Output Leakage Current Power
Off
(2)
(1)
(2)
(3)
(4)
(5)
Unless otherwise specified, min/max limits apply across the recommended operating temperature range. All typicals are given for V
CC
=
5 V and T
A
= 25°C.
See EIA Specification RS-422 for exact test conditions.
Measured per input. All other inputs at V
CC
or GND.
This is the current sourced when a high output is shorted to ground. Only one output at a time should be shorted.
The DS26C31M (−55°C to +125°C) is tested with V
OUT
between +6 V and 0 V while RS-422A condition is +6 V and
−0.25
V.
Copyright © 1998–2015, Texas Instruments Incorporated
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5
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DS26C31M DS26C31T
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