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SN65HVD179 Datasheet Preview

SN65HVD179 Datasheet

RS-485/RS-422 DRIVER AND BALANCED RECEIVER

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SN65HVD179
www.ti.com .................................................................................................................................................... SLLS668C – FEBRUARY 2006 – REVISED JULY 2008
5-V FULL-DUPLEX RS-485/RS-422 DRIVER AND BALANCED RECEIVER
FEATURES
1
Designed for INTERBUS Applications
Balanced Receiver Thresholds
1/2 Unit-Load (up to 64 nodes on the bus)
Bus-Pin ESD Protection 15 kV HBM
Bus-Fault Protection of –7V to 12V
Thermal Shutdown Protection
Power-Up/Down Glitch-free Bus Inputs and
Outputs
Designed for RS-422 and RS-485 Networks
APPLICATIONS
Digital Motor Control
Utility Meters
Chassis-to-Chassis Interconnections
Electronic Security Stations
Industrial, Process, and Building Automation
Point-of-Sale (POS) Terminals and Networks
DTE/DCE Interfaces
DESCRIPTION
The SN65HVD179 is a differential line driver and
differential-input line receiver that operates with a 5-V
power supply. Each driver and receiver has separate
input and output pins for full-duplex bus
communication designs. They are designed for
balanced transmission lines and interoperation with
ANSI TIA/EIA-485A, TIA/EIA-422-B, ITU-T v.11, and
ISO 8482:1993 standard-compliant devices.
The differential bus driver and receiver are monolithic,
integrated circuits designed for full-duplex
bi-directional data communication on multipoint
bus-transmission lines at signaling rates(1) up to 25
Mbps. The SN65HVD179 is fully enabled with no
external enabling pins.
The 1/2 unit load receiver has a high receiver input
resistance. This results in lower bus leakage currents
over the common-mode voltage range, and reduces
the total amount of current that a 485 driver is forced
to source or sink when transmitting.
The balanced differential receiver input threshold
makes the SN65HVD179 fully compatible with
fieldbus requirements that define an external failsafe
structure.
(1) The signaling rate of a line is the number of voltage
transitions that are made per second expressed in the units
bps (bits per second).
BALANCED RECEIVER INPUT THRESHOLDS
Recevier Output High
Receiver Output Low
VID
SN65HVD179
D PACKAGE (TOP VIEW)
VCC
1
R
2
D
3
GND
4
8
A
7
B
6
Z
5Y
3
D
2
R
5
Y
6
Z
8
A
7
B
1
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 the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006–2008, Texas Instruments Incorporated




etcTI

SN65HVD179 Datasheet Preview

SN65HVD179 Datasheet

RS-485/RS-422 DRIVER AND BALANCED RECEIVER

No Preview Available !

SN65HVD179
SLLS668C – FEBRUARY 2006 – REVISED JULY 2008 .................................................................................................................................................... www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
SIGNALING RATE
25 Mbps
UNIT LOADS
1/2
AVAILABLE OPTIONS
BASE PART NUMBER
SN65HVD179
SOIC MARKING
SN65HVD179
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range (unless otherwise noted)(1) (2)
VCC
VA, VB, VY, VZ
VTRANS
VI
PCONT
IO
Supply voltage range
Voltage range at any bus terminal (A, B, Y, Z)
Voltage input, transient pulse through 100 . See Figure 8 (A, B, Y, Z)(3)
Voltage input range (D, DE, RE)
Continuous total power dissipation
Output current (receiver output only, R)
UNIT
–0.3 V to 6 V
–9 V to 14 V
–50 to 50 V
–0.5 V to 7 V
Internally limited(4)
11 mA
(1) 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.
(2) All voltage values, except differential I/O bus voltages, are with respect to network ground terminal.
(3) This tests survivability only and the output state of the receiver is not specified.
(4) The Thermal shutdown of this device internally limits the continuous total power dissipation. Thermal shutdown typically occurs when the
junction temperature reaches 165°C.
RECOMMENDED OPERATING CONDITIONS
over operating free-air temperature range (unless otherwise noted)
VCC
VI or VIC
1/tUI
RL
VIH
VIL
VID
IOH
IOL
TJ
Supply voltage
Voltage at any bus terminal (separately or common mode)
Signaling rate
Differential load resistance
High-level input voltage
D
Low-level input voltage
D
Differential input voltage
High-level output current
Driver
Receiver
Low-level output current
Junction temperature(2)
Driver
Receiver
MIN
4.5
–7 (1)
54
2
0
–12
–60
–8
–40
NOM
60
MAX
5.5
12
25
VCC
0.8
12
UNIT
V
Mbps
V
mA
60
mA
8
150 °C
(1) The algebraic convention, in which the least positive (most negative) limit is designated as minimum is used in this data sheet.
(2) See thermal characteristics table for information regarding this specification.
ELECTROSTATIC DISCHARGE PROTECTION
PARAMETER
Human body model
Human body model(2)
Charged-device-model (3)
TEST CONDITIONS
Bus terminals and GND
All pins
All pins
(1) All typical values at 25°C and with a 5-V supply.
(2) Tested in accordance with JEDEC Standard 22, Test Method A114-A.
(3) Tested in accordance with JEDEC Standard 22, Test Method C101.
MIN TYP(1) MAX UNIT
±16
±4
kV
±1
2
Submit Documentation Feedback
Copyright © 2006–2008, Texas Instruments Incorporated
Product Folder Link(s): SN65HVD179


Part Number SN65HVD179
Description RS-485/RS-422 DRIVER AND BALANCED RECEIVER
Maker etcTI
Total Page 3 Pages
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