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參數(shù)資料
| 型號(hào)： | LTC1535 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Isolated RS485 Transceiver |
| 中文描述： | 485隔離收發(fā)器 |
| 文件頁數(shù)： | 4/12頁 |
| 文件大?。?/td> | 226K |
| 代理商： | LTC1535 |
4
LTC1535
POWER SIDE
V
CC
(Pin 1):
5V Supply. Bypass to GND with 10
μ
F capaci-
tor.
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 float.
DE (Pin 26):
Transmit Enable TTL Input to the Isolated
Side RS485 Driver. A high level enables the driver. Do not
float.
RE (Pin 27):
Receive Data Output Enable TTL Input. A low
level enables the receiver. This pin also provides a fault
output signal. (See Applications Information.)
RO (Pin 28):
Receive Data TTL Output.
Note 1:
Absolute Maximum Ratings are those values beyond which the
life of a device may be impaired.
Note 2:
RS422 50
specification based on RS485 27
test.
Note 3:
I
IN
is tested at V
CC2
= 5V, guaranteed by design from
V
CC2
= GND2
≤
5.25V.
Note 4:
Input fault conditions on the RS485 receiver are detected with a
fixed receiver offset. The offset is such that an input short or open will
result in a high data output.
Note 5:
The low voltage detect faults when V
CC2
or V
CC
drops below 4.2V
and reenables when greater than 4.4V. The fault can be monitored
through the weak driver output on RE.
Note 6:
Value derived from 1 second test.
ISOLATED SIDE
GND2 (Pin 11):
Isolated Side Power Ground.
Z (Pin 12):
Differential Driver Inverting Output.
Y (Pin 13):
Differential Driver Noninverting Output.
V
CC2
(Pin 14):
5V to 7.5V Supply from DC Transformer.
Bypass to GND with 10
μ
F capacitor.
B (Pin 15):
Differential Receiver Inverting Input.
A (Pin 16):
Differential Receiver Noninverting Input.
RO2 (Pin 17):
Isolated Side Receiver TTL Output.
SLO (Pin 18):
Slow Slew Rate Control of RS485 Driver. A
low level forces the driver outputs into slow slew rate
mode.
Note 7:
The input signals are internally sampled and encoded. The internal
sample rate determines the data output jitter since the internal sampling is
asynchronous with respect to the external data. Nominally, a 4MHz
internal sample rate gives 250ns of sampling uncertainty in the input
signals.
Note 8:
The maximum baud rate is 350kBd with 10% sampling jitter.
Lower baud rates have lower jitter.
Note 9:
Start-up time is the time for communication to recover after a fault
condition. Data time-out is the time a fault is indicated on RE after data
communication has stopped.
PU
ELECTRICAL CHARACTERISTICS
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