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參數資料
| 型號： | LTC1387C |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Single 5V RS232/RS485 Multiprotocol Transceiver |
| 中文描述： | 單5V RS232/RS485轉換多協議收發(fā)器 |
| 文件頁數： | 9/12頁 |
| 文件大?。?/td> | 167K |
| 代理商： | LTC1387C |
9
LTC 1387
SWITCHI G WAVEFOR S
U
IH
A, B
R
V
OL
V
OH
LTC1387 F11
t
PHL
t
PLH
V
IL
2.4V
0.8V
1.3V
1.7V
Figure 11. RS232 Receiver Propagation Delays
1.5V
3V
0V
RXEN
f = 1MHz: t
r
≤
10ns: t
f
≤
10ns
1.5V
R
V
OL
5V
t
ZL
t
LZ
0.5V
OUTPUT NORMALLY LOW
0V
LTC1387 F12
1.5V
1.5V
t
ZH
V
OH
OUTPUT NORMALLY HIGH
t
HZ
0.5V
R
Figure 12. Receiver Enable and Disable Times
U
S
A
O
PPLICATI
U
U
Basic Theory of Operating
The LTC1387 is a single 5V supply, single-port logic
reconfigurable RS485/RS232 transceiver with an onboard
charge pump. The interface port offers a flexible combina-
tion of an RS485 driver and an RS485 receiver or two
RS232 drivers and two RS232 receivers. The RS485
transceiver and the RS232 transceivers are designed to
share the same I/O pins. A logic input 485/232 controls the
selection between RS485 and RS232 transceiver modes.
The RS485 transceiver supports both RS485 and RS422
standards, whereas the RS232 transceivers support both
RS232 and EIA562 standards. With four additional control
inputs: ON, DXEN, RXEN and SLEW, the LTC1387 can
easily be reconfigured via software to adapt to various
communication needs including a one-signal-line RS232
I/O mode. Four examples of interface port connections are
shown in Figures 13 through 16.
Both the interface drivers and the receivers feature three-
state outputs. Driver outputs are forced into high
impedance when the driver is disabled, in the shutdown
mode or with the power off. The driver outputs can be
forced beyond power supply levels without damage up to
±
18V. The receiver inputs can withstand
±
25V without
damage. The receiver input resistance is typically 24k in
RS485 mode, shutdown mode or power off but drops to
5k in RS232 mode.
In RS485 mode, the DXEN and RXEN control the three-
state outputs of the driver and receiver respectively. The
SLEW input is active during RS485 mode and the logic
level controls the differential driver slew rate. This pin has
an internal 5
μ
A pull-up current source during the RS485
mode. A high logic selects fast differential driver slew rate
and a low logic selects slow slew rate. In slow slew mode,
the maximum signal bandwidth is reduced, minimizing
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LTC1387CG | 功能描述:IC TXRX RS232/RS485 5VSNGL20SSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:- 標準包裝:27 系列:- 類型:收發(fā)器 驅動器/接收器數:3/3 規(guī)程:RS232，RS485 電源電壓:4.75 V ~ 5.25 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC 包裝:管件 |
| LTC1387CG#PBF | 功能描述:IC TXRX RS232/RS485 5VSNGL20SSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:- 產品培訓模塊:RS-232 & USB Transceiver 標準包裝:2,000 系列:- 類型:收發(fā)器 驅動器/接收器數: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） 供應商設備封裝:16-SSOP 包裝:帶卷 (TR) 其它名稱:296-19849-2 |
| LTC1387CG#TR | 功能描述:IC TXRX RS232/RS485 5V 20SSOP RoHS:否 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:- 標準包裝:27 系列:- 類型:收發(fā)器 驅動器/接收器數:3/3 規(guī)程:RS232，RS485 電源電壓:4.75 V ~ 5.25 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC 包裝:管件 |
| LTC1387CG#TRPBF | 功能描述:IC TXRX RS232/RS485 5VSNGL20SSOP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:- 標準包裝:27 系列:- 類型:收發(fā)器 驅動器/接收器數:3/3 規(guī)程:RS232，RS485 電源電壓:4.75 V ~ 5.25 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC 包裝:管件 |
| LTC1387CGPBF | 制造商:Linear Technology 功能描述:RS-232/RS-485 Driver/Receiver SSOP20 |
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