参数资料
型号: MAX3140CEI+T
厂商: Maxim Integrated Products
文件页数: 6/36页
文件大小: 0K
描述: IC UART W/RS485 28-QSOP
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 2,500
特点: 收发器
FIFO's: 8 字节
规程: RS232,RS485
电源电压: 4.75 V ~ 5.25 V
带IrDA 编码器/解码器:
带故障启动位检测功能:
带CMOS:
安装类型: 表面贴装
封装/外壳: 28-QSOP
供应商设备封装: 28-QSOP
包装: 带卷 (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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