參數(shù)資料
型號(hào)： MAX3140EEI+T
廠商： Maxim Integrated Products
文件頁(yè)數(shù)： 6/36頁(yè)
文件大?。?/td> 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(biāo)準(zhǔn)包裝： 2,500
特點(diǎn)： 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： 是
帶故障啟動(dòng)位檢測(cè)功能： 是
帶CMOS： 是
安裝類(lèi)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
14
______________________________________________________________________________________
VOH
VOL
A
B
1V
-1V
1.5V
OUTPUT
INPUT
RO
tPLH
tPHL
Figure 7. Receiver Propagation Delays
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
3V
0
VCC
RO
0
1.5V
VOL + 0.5V
VOH - 0.5V
1.5V
tZL(SHDN), tZL
tLZ
tZH(SHDN), tZH
tHZ
RE
Figure 8. Receiver Enable and Disable Times
R
B
RECEIVER
OUTPUT
ATE
A
VID
R
Figure 9. Receiver Propagation Delay Test Circuit
_______________Detailed Description
The MAX3140 combines an SPI/QSPI/MICROWIRE-
compatible UART (MAX3100) and an RS-485/RS-422
transceiver (MAX3089) in one package. The UART sup-
ports data rates up to 230k baud for both standard
UART bit streams as well as IrDA, and includes an
8-word receive FIFO. Also included is a parity-bit inter-
rupt useful in 9-bit address recognition.
The RS-485/RS-422 transceiver has a true fail-safe
receiver and allows up to 256 transceivers on the bus.
Other features include pin-selectable full/half-duplex
operation and a phase control to correct for twisted-
pair reversal. The slew rate of the RS-485/RS-422 trans-
ceiver is selectable, limiting the maximum data rate to
115kbps, 500kbps, or 10Mbps. The RS-485/RS-422 dri-
vers are output short-circuit current limited, and thermal
shutdown circuitry protects the RS-485/RS-422 drivers
against excessive power dissipation.
The UART and RS-485/RS422 functions can be used
together or independently since the two functions only
share supply and ground connections. This part oper-
ates from a single +5V supply.
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