LTC491IS#PBF Linear Technology, LTC491IS#PBF Datasheet - Page 10

• Manufacturer Part Number: LTC491IS#PBF
• Description: IC TXRX RS485 LOW POWER 14-SOIC
• Manufacturer: Linear Technology
• Type: Transceiverr

Specifications of LTC491IS#PBF

• Number Of Drivers/receivers: 1/1
• Protocol: RS422, RS485
• Voltage - Supply: 4.75 V ~ 5.25 V
• Mounting Type: Surface Mount
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Data Rate: 2.5Mbps
• Interface Circuit Standard 1: RS-422/RS-485
• Number Of Receivers: 1
• Number Of Transmitters: 1
• Number Of Transceivers: 1
• Data Transmission Topology: Multidrop/Multipoint
• Receiver Signal Type: Differential
• Transmitter Signal Type: Differential
• Single Supply Voltage (typ): 5V
• Single Supply Voltage (min): 4.75V
• Single Supply Voltage (max): 5.25V
• Dual Supply Voltage (typ): Not RequiredV
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Supply Current: 0.5mA
• Power Supply Requirement: Single
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 14
• Package Type: SOIC N
• No. Of Drivers: 1
• Supply Voltage Range: 4.75V To 5.25V
• Driver Case Style: SOIC
• No. Of Pins: 14
• Operating Temperature Range: -40°C To +85°C
• Msl: MSL 1 - Unlimited
• Termination Type: SMD
• Rohs Compliant: Yes
• Filter Terminals: SMD
• Ic Interface Type: RS422, RS485
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PACKAGE DESCRIPTIO
A
Fault Protection
All of LTC’s RS485 products are protected against ESD
transients up to 2kV using the human body model (100pF,
1.5k ). However, some applications need more
protection. The best protection method is to connect a
bidirectional TransZorb
(Figure 16).
A TransZorb is a silicon transient voltage suppressor that
has exceptional surge handling capabilities, fast response
time, and low series resistance. They are available from
General Semiconductor Industries and come in a variety of
breakdown voltages and prices. Be sure to pick a break-
down voltage higher than the common mode voltage
LTC491
10
PPLICATI
O
NOTE:
1. DIMENSIONS ARE
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
U
(7.620 – 8.255)
(0.203 – 0.381)
S
8.255
®
.300 – .325
.008 – .015
.325
from each line side pin to ground
I FOR ATIO
+0.889
–0.381
+.035
–.015
U
MILLIMETERS
INCHES
W
U
(0.508)
.020
MIN
14-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510)
(3.302 0.127)
(6.477 0.381)
.130 .005
.255 .015*
U
(3.048)
.120
MIN
N Package
14
1
required for your application (typically 12V). Also, don’t
forget to check how much the added parasitic capacitance
will load down the bus.
TransZorb is a registered trademark of General Instruments, GSI
(0.125)
.005
MIN
13
2
(2.54)
.100
BSC
12
3
Figure 16. ESD Protection with TransZorbs
(1.143 – 1.651)
.045 – .065
(19.558)
DRIVER
MAX
.770*
11
4
10
5
9
6
(0.457 0.076)
Y
7
8
.018 .003
120
(1.651)
.065
TYP
N14 1002
Z
LTC491 • F16
491fa