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參數(shù)資料
| 型號(hào)： | LT1791C |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 60V Fault Protected RS485/RS422 Transceivers |
| 中文描述： | 60V的故障保護(hù)RS485/RS422收發(fā)器 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大?。?/td> | 196K |
| 代理商： | LT1791C |
6
LT1785/LT1785A
LT1791/LT1791A
TEST CIRCUITS
Figure 1. Driver DC Test Load
Figure 2. Receiver Timing Test Load
V
OD
A
B
R
R
V
OC
1785/91 F01
RECEIVER
OUTPUT
C
RL
1k
S1
S2
TEST POINT
V
CC
1k
1785/91 F02
state. If receiver enable RE and driver enable DE are both
in the disable state, the circuit goes to a low power
shutdown state. Placing either RE or DE into its active state
brings the circuit out of shutdown. Shutdown state is not
entered until a 3
μ
s delay after both RE and DE are disabled,
allowing for logic skews in toggling between transmit and
receive modes of operation. For CAN bus operation the DE
pin is used for signal input to place the data bus in
dominant or recessive states.
DI:
Driver Input. TTL level logic input. A logic high at DI
causes driver output A or Y to a high state, and output B
or Z to a low state. Complementary output states occur for
DI low. For CAN bus applications DI should be tied low.
GND:
Ground.
Y:
Driver Output. The Y driver output is in phase with the
driver input DI. In the LT1785 driver output Y is internally
connected to receiver input A. The driver output assumes
a high impedance state when DE is low, power is off or
thermal shutdown is activated. The driver output is pro-
tected from shorts between
±
60V in both active and high
impedance modes. For CAN applications, output Y is the
CANL output node.
Z:
Driver Output. The Z driver output is opposite in phase
to the driver input DI. In the LT1785 driver output Z is
internally connected to receiver input B. The driver output
assumes a high impedance state when DE is low, power is
off or thermal shutdown is activated. The driver output is
PI
FU
CTIO
N
S
U
U
protected from shorts between
±
60V in both active and
high impedance modes. For CAN applications, output Z is
the CANH output node.
A:
Receiver Input. The A receiver input forces a high
receiver output when V(A)
≥
[V(B) + 200mV]. V(A)
≤
[V(B)
– 200mV] forces a receiver output low. Receiver inputs A
and B are protected against voltage faults between
±
60V.
The high input impedance allows up to 128 LT1785 or
LT1791 transceivers on one RS485 data bus.
The LT1785A/LT1791A have guaranteed receiver input
thresholds –200mV < V
TH
< 0. Receiver outputs are
guaranteed to be in a high state for 0V inputs.
B:
Receiver Input. The B receiver input forces a high
receiver output when V(A)
≥
[V(B) + 200mV]. When V(A)
≤
[V(B) – 200mV], the B receiver forces a receiver output
low. Receiver inputs A and B are protected against voltage
faults between
±
60V. The high input impedance allows up
to 128 LT1785 or LT1791 transceivers on one RS485data
bus.
The LT1785A/LT1791A have guaranteed receiver input
thresholds –200mV < V
TH
< 0. Receiver outputs are
guaranteed to be in a high state for 0V inputs.
V
CC
:
Positive Supply Input. For RS422 or RS485operation,
4.75V
≤
V
CC
≤
5.25V. Higher V
CC
input voltages increase
output drive swing. V
CC
should be decoupled with a 0.1
μ
F
low ESR capacitor directly at Pin 8 (V
CC
).
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1791CN | 功能描述:IC TXRX RS485/RS422 60V 14-DIP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器 系列:- 標(biāo)準(zhǔn)包裝:121 系列:- 類型:收發(fā)器 驅(qū)動(dòng)器/接收器數(shù):1/1 規(guī)程:RS422，RS485 電源電壓:3 V ~ 3.6 V 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:10-DFN（3x3） 包裝:管件 |
| LT1791CN#PBF | 功能描述:IC TXRX RS485/RS422 60V 14-DIP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器 系列:- 產(chǎn)品培訓(xùn)模塊:RS-232 & USB Transceiver 標(biāo)準(zhǔn)包裝:2,000 系列:- 類型:收發(fā)器 驅(qū)動(dòng)器/接收器數(shù):1/1 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-SSOP（0.209"，5.30mm 寬） 供應(yīng)商設(shè)備封裝:16-SSOP 包裝:帶卷 (TR) 其它名稱:296-19849-2 |
| LT1791CN-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:60V Fault Protected RS485/RS422 Transceivers |
| LT1791CN-TR | 制造商:LINER 制造商全稱:Linear Technology 功能描述:60V Fault Protected RS485/RS422 Transceivers |
| LT1791CN-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:60V Fault Protected RS485/RS422 Transceivers |
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