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SN65HVD1795 Datasheet Preview

SN65HVD1795 Datasheet

RS-485 Transceiver

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SN65HVD1794, SN65HVD1795
SN65HVD1796
www.ti.com
SLLS935A – AUGUST 2008 – REVISED AUGUST 2012
70-V Fault-Protected RS-485 Transceiver With Cable Invert
Check for Samples: SN65HVD1794, SN65HVD1795, SN65HVD1796
FEATURES
1
• Bus-Pin Fault Protection to > ±70 V
• Cable Invert Function Allows Correction for
Reversed Bus Pins
• Common-Mode Voltage Range (–20 V to 25 V)
More Than Doubles TIA/EIA 485 Requirement
• Bus I/O Protection
– ±16 kV JEDEC HBM Protection
• Reduced Unit Load for Up to 256 Nodes
• Failsafe Receiver for Open-Circuit, Short-
Circuit and Idle-Bus Conditions
• Low Power Consumption
– ICC 5 mA Quiescent During Operation
• Power-Up, Power-Down Glitch-Free Operation
APPLICATIONS
• Designed for RS-485 and RS-422 Networks
DESCRIPTION
These devices are designed to survive overvoltage faults such as direct shorts to power supplies, mis-wiring
faults, connector failures, cable crushes, and tool mis-applications. They are also robust to ESD events, with high
levels of protection to human-body model specifications.
These devices combine a differential driver and a differential receiver, which operate from a single power supply.
The driver differential outputs and the receiver differential inputs are connected internally to for a bus port
suitable for half-duplex (two-wire bus) communication. A cable invert pin (INV) allows active correction of mis-
wires that may occur during installation. Upon detecting communication errors, the user can apply a logic HIGH
to the INV pin, effectively inverting the polarity of the differential bus port, thereby correcting for the reversed bus
wires.
These devices feature a wide common-mode voltage range, making them suitable for multi-point applications
over long cable runs. These devices are characterized from –40°C to 105°C.
INV Input Can Correct
for Crossed Wires
VFAULT up to 70 V
PART NUMBER
SN65HVD1794
SN65HVD1795 PREVIEW
SN65HVD1796 PREVIEW
Table 1. PRODUCT SELECTION GUIDE
DUPLEX
Half
Half
Half
SIGNALING RATE
115 kbps
1 Mbps
10 Mbps
NODES
Up to 256
Up to 256
Up to 64
For similar features with 3.3 V supply operation, see the SN65HVD1781 (SLLS877).
CABLE LENGTH
1500 m
150 m
50 m
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.
UNLESS OTHERWISE NOTED this document contains
PRODUCTION DATA information 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.
Copyright © 2008–2012, Texas Instruments Incorporated




etcTI

SN65HVD1795 Datasheet Preview

SN65HVD1795 Datasheet

RS-485 Transceiver

No Preview Available !

SN65HVD1794, SN65HVD1795
SN65HVD1796
SLLS935A – AUGUST 2008 – REVISED AUGUST 2012
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
DEVICE INFORMATION
D Package
(Top View)
R
1
INV
2
DE
3
D
4
8
VCC
7B
6A
5 GND
P0066-04
1
R
2
INV
4
D
3
DE
6
A
7
B
S0311-01
Figure 1. SN65HVD17xx With Inverting Feature to Correct for Miswired Cables
INPUT
D
H
L
H
ENABLE
DE
H
H
H
L
H
X
X
OPEN
OPEN
L
OPEN
H
H
DRIVER FUNCTION TABLE
INVERT OUTPUTS
INV
A
B
L
H
L Actively drive normal bus High
L
L
H Actively drive normal bus Low
H
L
H Actively drive inverted bus High (drive normal bus
Low)
H
H
L Actively drive inverted bus Low (drive normal bus
High)
X
Z
Z Driver disabled
X
Z
Z Driver disabled by default
L
H
L Actively drive bus High by default
H
L
H Actively drive bus Low by default (inverted cable)
DIFFERENTIAL INPUT
VID = VA – VB
VIT+ < VID
VIT– < VID < VIT+
VID < VIT–
Open-circuit bus
Short-circuit bus
Idle (terminated) bus
RECEIVER FUNCTION TABLE
INVERT OUTPUT
INV
R
L or OPEN
H
Receive valid bus High
H
L
Receive inverted bus Low
X
?
Indeterminate bus state
L or OPEN
L
Receive valid bus Low
H
H
Receive inverted bus High
L or OPEN
H
Fail-safe high output
H
L
Failsafe inverted output
L or OPEN
H
Fail-safe high output
H
L
Failsafe inverted output
L or OPEN
H
Fail-safe high output
H
L
Failsafe inverted output
2
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Copyright © 2008–2012, Texas Instruments Incorporated
Product Folder Links: SN65HVD1794, SN65HVD1795 SN65HVD1796


Part Number SN65HVD1795
Description RS-485 Transceiver
Maker etcTI
Total Page 3 Pages
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