LT1785IS8#TRPBF Linear Technology, LT1785IS8#TRPBF Datasheet - Page 8

• Manufacturer Part Number: LT1785IS8#TRPBF
• Description: IC TXRX RS485/RS422 60V 8-SOIC
• Manufacturer: Linear Technology
• Type: Transceiverr

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

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