參數(shù)資料
型號: MAX3140CEI+T
廠商: Maxim Integrated Products
文件頁數(shù): 4/36頁
文件大小: 0K
描述: IC UART W/RS485 28-QSOP
產(chǎn)品培訓(xùn)模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標準包裝: 2,500
特點: 收發(fā)器
FIFO's: 8 字節(jié)
規(guī)程: RS232,RS485
電源電壓: 4.75 V ~ 5.25 V
帶IrDA 編碼器/解碼器:
帶故障啟動位檢測功能:
帶CMOS:
安裝類型: 表面貼裝
封裝/外殼: 28-QSOP
供應(yīng)商設(shè)備封裝: 28-QSOP
包裝: 帶卷 (TR)
MAX3140
SPI/MICROWIRE-Compatible UART with Integrated
True Fail-Safe RS-485/RS-422 Transceivers
12
______________________________________________________________________________________
Pin Description (continued)
Transceiver Function Tables
21
22
Positive Supply (4.75V to 5.25V)
VCC
22
23
24
UART SPI/MICROWIRE Serial-Data Output. High impedance when CS is high.
DOUT
24
UART SPI/MICROWIRE Serial-Data Input. Schmitt-trigger input.
DIN
23
25
26
UART Active-Low Chip-Select Input. DOUT goes high impedance when CS is high. IRQ, TX,
and RTS are always active. Schmitt-trigger input.
CS
26
27
28
UART Hardware Shutdown Input. When shut down (SHDN = 0), the UART oscillator turns off
immediately without waiting for the current transmission to end, reducing the supply current
to just leakage currents.
SHDN
28
UART Active-Low Interrupt Output. Open-drain interrupt output to microprocessor.
IRQ
27
UART SPI/MICROWIRE Serial-Clock Input. Schmitt-trigger input.
SCLK
25
RS-485 Receiver Phase. Connect RXP to GND or leave it unconnected for normal receiver
phase/polarity. Connect RXP to VCC to invert the receiver phase/polarity.
RXP
21
FULL
DUPLEX
HALF
DUPLEX
PIN
NAME
FUNCTION
*
In half-duplex mode, the driver outputs serve as receiver inputs. The full-duplex receiver inputs ( A and B) still have a 1/8-unit load, but
do not affect the receiver output.
RE
DE
TXP
TRANSMITTING
Z
Y
DI
0
1
X
1
0
1
0
X
1
0
1
0
1
X
1
0
1
0
X
1
High-Z
X
0
X
Shutdown (High-Z)
X
1
0
X
0
1
H/F
OUTPUTS
INPUTS
0
1
0
RXP
X
DE
0
RE
≥ -0.05V
≤ -0.2V
≥ -0.05V
≤ -0.2V
X
A-B
1
0
1
0
RO
X
≥ -0.05V
≤ -0.2V
Y-Z
1
0
1
X
1
0
1
0
X
Open/
Shorted
X
1
Open/
Shorted
X
0
1
0
1
0
≥ -0.05V
≤ -0.2V
X
Open/
Shorted
X
Open/
Shorted
X
1
0
1
X
High-Z
X
Shutdown
(High-Z)
X
OUTPUTS
RECEIVING
INPUTS
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