LT1785CS8#TR Linear Technology, LT1785CS8#TR Datasheet - Page 8
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LT1785CS8#TR
Manufacturer Part Number
LT1785CS8#TR
Description
IC TXRX 60V RS485/RS422 8SOIC
Manufacturer
Linear Technology
Type
Transceiverr
Datasheet
1.LT1785CN8PBF.pdf
(16 pages)
Specifications of LT1785CS8#TR
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)
Lead Free Status / RoHS Status
Contains lead / RoHS non-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