参数资料
| 型号： | MAX3140EEI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 16/36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： | 50 |
| 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： | 是 |
| 带故障启动位检测功能： | 是 |
| 带CMOS： | 是 |
| 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： | 管件 |
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MAX3140
SPI/MICROWIRE-Compatible UART with Integrated
True Fail-Safe RS-485/RS-422 Transceivers
______________________________________________________________________________________
23
IRQ
N
RM MASK
TM MASK
PM MASK
TRANSITION ON RX
SHUTDOWN
RAM MASK
FRAMING ERROR
SHUTDOWN
RAM MASK
R
S
Q
NEW DATA AVAILABLE
DATA READ
TRANSMIT BUFFER EMPTY
DATA READ
PE = 1 AND RECEIVED PARITY BIT = 1
PE = 0 OR RECEIVED PARITY BIT = 0
R
S
Q
R
S
Q
Figure 15. Functional Diagram for Interrupt Sources and Mask Blocks
Table 7. Interrupt Sources and Masks—Bit Descriptions
Transmit buffer is
empty
T
MEANING
WHEN SET
TM
The T bit is set when the transmit buffer is ready to accept data. IRQ is asserted
low if TM = 1 and the transmit buffer becomes empty. This source is cleared on
the rising edge of SCLK‘s 16th pulse when using a READ DATA or WRITE DATA
operation. Although the interrupt is cleared, poll T to determine transmit-buffer
status.
DESCRIPTION
Received parity bit = 1
Transition on RX when
in shutdown; framing
error when not in
shutdown
RA/FE
RAM
This is the RA (RX-transition) bit in shutdown, and the FE (framing-error) bit in
operating mode. RA is set if there has been a transition on RX since entering
shutdown. RA is cleared when the MAX3140 exits shutdown. IRQ is asserted
when RA is set and RAM = 1.
FE is determined solely by the currently received data, and is not stored in FIFO.
The FE bit is set if a zero is received when the first stop bit is expected. FE is
cleared upon receipt of the next properly framed character. IRQ is asserted
when FE is set and RAM = 1.
MASK
BIT
Pr
PM
The Pr bit reflects the value in the word currently in the receive-buffer register
(oldest data available). The Pr bit is set when parity is enabled (PE = 1) and the
received parity bit is 1. The Pr bit is cleared either when parity is not enabled (PE
= 0), or when parity is enabled and the received bit is 0. An interrupt is issued
based on the oldest Pr value in the receiver FIFO. The oldest Pr value is the next
value read by a READ DATA operation.
BIT
NAME
Data available
R
RM
The R bit is set when new data is available to be read or when data is being read
from the receive register/FIFO. FIFO is cleared when all data has been read. An
interrupt is asserted as long as R = 1 and RM = 1.
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相关代理商/技术参数 |
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| MAX3140EEI+ | 功能描述:UART 接口集成电路 SPI/uWire Compatible RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
| MAX3140EEI+T | 功能描述:UART 接口集成电路 SPI/uWire Compatible RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
| MAX3140EEI-T | 功能描述:UART 接口集成电路 RoHS:否 制造商:Texas Instruments 通道数量:2 数据速率:3 Mbps 电源电压-最大:3.6 V 电源电压-最小:2.7 V 电源电流:20 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:LQFP-48 封装:Reel |
| MAX3147NC SPL | 制造商:Toshiba America Electronic Components 功能描述:NORTEL HDD - Bulk |
| MAX314C/D | 功能描述:模拟开关 IC 10Ohm Quad SPST CMOS Analog Switches RoHS:否 制造商:Texas Instruments 开关数量:2 开关配置:SPDT 开启电阻（最大值）:0.1 Ohms 切换电压（最大）: 开启时间（最大值）: 关闭时间（最大值）: 工作电源电压:2.7 V to 4.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:DSBGA-16 |
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