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參數(shù)資料
| 型號： | MAX3140 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | SPI/MICROWIRE-Compatible UART with Integrated True Fail-Safe RS-485/RS-422 Transceivers |
| 中文描述： | SPI/MICROWIRE兼容的UART，集成真正失效保護的RS-485/RS-422收發(fā)器 |
| 文件頁數(shù)： | 11/36頁 |
| 文件大小： | 468K |
| 代理商： | MAX3140 |
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M
SPI/MICROWIRE-Compatible UART with Integrated
True Fail-Safe RS-485/RS-422 Transceivers
______________________________________________________________________________________
11
Pin Desc ription
UART Crystal Connection. Leave X2 unconnected for external clock. See the Crystals,
Oscillators, and Ceramic Resonators section.
X2
1
1
2
UART Crystal Connection. X1 also serves as an external clock input. See the Crystals,
Oscillators, and Ceramic Resonators section.
X1
2
3
4
UART Request-to-Send Active-Low Output. Controlled by the RTS bit. Use to control the dri-
ver enable in RS-485 networks.
RTS
4
UART Clear-to-Send Active-Low Input. Read via the CTS bit.
CTS
3
5
6
UART Asynchronous Serial-Data (transmitter) Output
TX
6
7
8
Ground
GND
8
RS-485 Half/Full-Duplex Selector Pin. Connect H/
F
to V
CC
for half-duplex mode; connect H/
F
to GND or leave it unconnected for full-duplex mode.
H/
F
7
UART Asynchronous Serial-Data (receiver) Input. The serial information received from the modem
or RS-232/RS-485 receiver. A transition on RX while in shutdown generates an interrupt (Table 1).
RX
5
9
10
RS-485 Receiver Output Enable. Drive
RE
low to enable RO; RO is high impedance when
RE
is high. Drive
RE
high and DE low to enter low-power shutdown mode.
RE
10
11
12
RS-485 Driver Input. With DE high, a low on DI forces noninverting output low and inverting
output high. Similarly, a high on DI forces noninverting output high and inverting output low.
DI
12
RS-485 Driver Output Enable. Drive DE high to enable driver outputs. These outputs are high
impedance when DE is low. Drive
RE
high and DE low to enter low-power shutdown mode.
DE
11
13
14
No Connection. Not internally connected.
N.C.
14
15
—
RS-485 Noninverting Driver Output
Y
16
RS-485 Transmitter Phase. Connect TXP to GND or leave it floating for normal transmitter
phase/polarity. Connect TXP to V
CC
to invert the transmitter phase/polarity.
TXP
15
RS-485 Transceiver Slew-Rate-Limit Selector Pin. Connect SRL to GND for a 10Mbps com-
munication rate, connect SRL to V
CC
for a 500kbps rate, or leave SRL unconnected for a
115kbps rate.
SRL
13
RS-485 Receiver Output. When
RE
is low and if A - B
≥
-50mV, RO will be high; if A - B
≤
-200mV, RO will be low.
RO
9
16
17
No Connection. Not internally connected.
N.C.
17
—
18
RS-485 Inverting Receiver Input and RS-485 Inverting Driver Output*
Z
—
RS-485 Inverting Driver Output
Z
18
—
19
RS-485 Receiver Input Resistors*
B
—
—
20
RS-485 Receiver Input Resistors*
A
—
RS-485 Noninverting Receiver Input
A
20
RS-485 Inverting Receiver Input
B
19
RS-485 Noninverting Receiver Input and RS-485 Noninverting Driver Output*
Y
—
FULL
DUPLEX
HALF
DUPLEX
PIN
NAME
FUNCTION
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX3140CEI | 功能描述:UART 接口集成電路 RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel |
| MAX3140CEI+ | 功能描述:UART 接口集成電路 SPI/uWire Compatible RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel |
| MAX3140CEI+T | 功能描述:UART 接口集成電路 SPI/uWire Compatible RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel |
| MAX3140CEI-T | 功能描述:UART 接口集成電路 RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel |
| MAX3140EEI | 功能描述:UART 接口集成電路 RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel |
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