LTC1535CSWPBF LINER [Linear Technology], LTC1535CSWPBF Datasheet - Page 7

• Manufacturer Part Number: LTC1535CSWPBF
• Description: Isolated RS485 Transceiver
• Manufacturer: LINER [Linear Technology]

PIN FUNCTIONS
POWER SIDE
V
capacitor.
ST1 (Pin 2): DC Converter Output 1 to DC Transformer.
ST2 (Pin 3): DC Converter Output 2 to DC Transformer.
GND (Pin 4): Ground.
DI (Pin 25): Transmit Data TTL Input to the Isolated Side
RS485 Driver. Do not fl oat.
DE (Pin 26): Transmit Enable TTL Input to the Isolated
Side RS485 Driver. A high level enables the driver. Do
not fl oat.
RE (Pin 27): Receive Data Output Enable TTL Input. A low
level enables the receiver. This pin also provides a fault
output signal. (See Figure 11.)
RO (Pin 28): Receive Data TTL Output.
BLOCK DIAGRAM
CC
(Pin 1): 5V Supply. Bypass to GND with 10μF
28
27
26
25
1
4
RO
RE
DE
DI
V
GND
CC
ST1
2
FAULT
EN
DECODE
ENCODE
3
ST2
POWER SIDE
420kHz
1
ISOLATED SIDE
1.3
1.3
ISOLATED SIDE
GND2 (Pin 11): Isolated Side Power Ground.
Z (Pin 12): Differential Driver Inverting Output.
Y (Pin 13): Differential Driver Noninverting Output.
V
Bypass to GND2 with 10μF capacitor.
B (Pin 15): Differential Receiver Inverting Input.
A (Pin 16): Differential Receiver Noninverting Input.
RO2 (Pin 17): Isolated Side Receiver TTL Output. This
output is always enabled and is unaffected by RE.
SLO (Pin 18): Slow Slew Rate Control of RS485 Driver.
A low level forces the driver outputs into slow slew rate
mode.
CC2
ENCODE
DECODE
FAULT
(Pin 14): 5V to 7.5V Supply from DC Transformer.
GND2
+
11
EN
V
14
CC2
R
D
27.25k
12.75k
27.25k
12.75k
V
CC2
63.5k
100k
63.5k
LTC1535
1535 BD
RO2
SLO
A
B
Y
Z
16
15
17
13
12
18
1535fb
7