LT1785IS8#TRPBF Linear Technology, LT1785IS8#TRPBF Datasheet - Page 8
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LT1785IS8#TRPBF
Manufacturer Part Number
LT1785IS8#TRPBF
Description
IC TXRX RS485/RS422 60V 8-SOIC
Manufacturer
Linear Technology
Type
Transceiverr
Datasheet
1.LT1785CN8PBF.pdf
(16 pages)
Specifications of LT1785IS8#TRPBF
Number Of Drivers/receivers
1/1
Protocol
RS422, RS485
Voltage - Supply
4.75 V ~ 5.25 V
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Data Rate
250Kbps
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
9mA
Power Supply Requirement
Single
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
8
Package Type
SOIC N
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
TEST CIRCUITS
LT1785/LT1785A/
LT1791/LT1791A
FUNCTION TABLES
LT1785 Transmitting
LT1785 Receiving
8
* ≥ 0mV for LT1785A
DI
RE
RE
0
0
1
1
1
0
0
0
1
5V
Figure 3. Driver/Receiver Timing Test Circuit
DE
DE
DE
A
B
1
1
0
1
1
0
0
0
0
INPUTS
INPUTS
Figure 1. Driver DC Test Load
A
B
R
DIFF
V
DI
DI
OD
0
1
X
0
1
X
X
X
X
Hi-Z
≤ –200mV
≥ 200mV*
C
C
R
R
A
0
1
0
1
L1
L2
Open
A-B
X
1785/91 F01
V
A
B
OC
OUTPUTS
Hi-Z
B
1
0
1
0
RE
OUTPUT
Hi-Z
RO
0
1
1
Hi-Z
Hi-Z
Hi-Z
RO
0
1
1785/91 F03
15pF
RO
LT1791
* ≥ 0mV for LT1791A
RE
0
0
0
0
0
0
0
0
0
1
1
1
RECEIVER
UNDER TEST
OUTPUT
OUTPUT
DE
0
0
0
1
1
1
1
1
1
0
1
1
Figure 2. Receiver Timing Test Load
INPUTS
Figure 4. Driver Timing Test Load
DI
TEST POINT
X
X
X
0
0
0
1
1
1
X
0
1
C
RL
C
500Ω
L
≤ –200mV
≥ 200mV*
≤ –200mV
≥ 200mV*
≤ –200mV
≥ 200mV*
Open
Open
Open
A-B
X
X
X
1k
S1
S2
Hi-Z
Hi-Z
Hi-Z
Hi-Z
S1
S2
Y
0
0
0
1
1
1
0
1
1k
OUTPUTS
Hi-Z
Hi-Z
Hi-Z
Hi-Z
1785/91 F02
Z
1
1
1
0
0
0
1
0
1785/91 F04
V
V
CC
CC
Hi-Z
Hi-Z
Hi-Z
178591fc
RO
0
1
1
0
1
1
0
1
1