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| 型号： | MAX3238ECAI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/14页 |
| 文件大小： | 0K |
| 描述： | IC TXRX RS232 250KBPS 28-SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 46 |
| 类型： | 线路收发器 |
| 驱动器/接收器数： | 5/3 |
| 规程： | RS232 |
| 电源电压： | 3 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 28-SSOP |
| 包装： | 管件 |
| 产品目录页面： | 1406 (CN2011-ZH PDF) |
MAX3238E/MAX3248E
+3.0V to +5.5V, 10nA, 250kbps RS-232 Transceivers
with ±15kV ESD-Protected I/O and Logic Pins
_______________________________________________________________________________________
7
AutoShutdown Plus Mode
A 10nA supply current is achieved with Maxim’s
AutoShutdown Plus feature, which operates when
FORCEOFF is low and FORCEON is high. When the
MAX3238E/MAX3248E sense no valid signal transitions
on all receiver and transmitter inputs for 30s, the on-
board power supply and drivers are shut off, reducing
supply current to 1A. If the receiver inputs are in the
invalid range (-0.3V < R_IN < +0.3V) and the transmit-
ter inputs are at GND or VCC, supply current is further
reduced to 10nA. This occurs if the RS-232 cable is
disconnected or if the connected peripheral transmit-
ters are turned off. The system turns on again when a
valid transition is applied to any RS-232 receiver or
transmitter input. As a result, the system saves power
without changes to the existing BIOS or operating sys-
tem. The INVALID output is high when the receivers are
active. Since INVALID indicates the receiver inputs’
condition, it can be used in any mode (Figure 3).
MAX3238E/
MAX3248E
I/O
CHIP
WITH
UART
CPU
RS-232
POWER
MANAGEMENT
UNIT OR
KEYBOARD
CONTROLLER
FORCEOFF
FORCEON
INVALID
T1
T2
T3
T4
T5
R1
R2
R3
Figure 1. Interface Under Control of PMU
MAX3238E
MAX3248E
T1OUT
R1OUTB
Tx
5k
UART
VCC
T1IN
THREE-STATED
LOGIC
TRANSITION
DETECTOR
R1IN
PROTECTION
DIODE
R1OUT
FORCEOFF = GND
VCC
TO
P
Rx
PREVIOUS
RS-232
Tx
UART
SHDN = GND
VCC
GND
Rx
5k
a) OLDER RS-232: POWERED-DOWN UART DRAWS CURRENT FROM ACTIVE
RECEIVER OUTPUT IN SHUTDOWN.
b) NEW MAX3238E/MAX3248E: IN SHUTDOWN, R1OUTB IS USED TO MONITOR
EXTERNAL DEVICES AND R1OUT IS THREE STATED, ELIMINATING A CURRENT
PATH THROUGH THE UART'S PROTECTION DIODE.
GND
PROTECTION
DIODE
I
Figure 2. MAX3238E/MAX3248E detect RS-232 activity when
the UART and interface are shut down.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX3238ECAI+ | 功能描述:RS-232接口集成电路 3-5.5V 250kbps Transceiver RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| MAX3238ECAI+T | 功能描述:RS-232接口集成电路 3-5.5V 250kbps Transceiver RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| MAX3238ECAI-T | 功能描述:RS-232接口集成电路 RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| MAX3238ECDB | 功能描述:RS-232接口集成电路 3 to 5V Multichannel RS-232 Line Drv/Rcvr RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| MAX3238ECDBG4 | 功能描述:RS-232接口集成电路 3-5.5V Multich RS- 232 Line Drvr/Rcvr RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
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