max3221, max3223, max3243 1µa电源电流、+3v至+5.5v、真rs-232收发器,带有autoshutdown
max3221, max3223, max3243概述
the max3221/max3223/max3243 achieve 1µa supply current with maxim's revolutionary autoshutdown™ feature. when the max3221/max3223/max3243 do not sense a valid signal level on their receiver inputs, the on-board power supply and drivers shut down. this occurs if the rs-232 cable is disconnected or if the transmitters of the connected peripheral are turned off. the system turns on again when a valid level is applied to any rs-232 receiver input. as a result, the system saves power without changes to the existing bios or operating system.
the max3221/max3223/max3243 transceivers are 3v-powered eia/tia-232 and v.28/v.24 communications interfaces intended for notebook computer applications. a proprietary, high-efficiency, dual charge-pump power supply and a low-dropout transmitter combine to deliver true rs-232 performance from a single +3.0v to +5.5v supply. a guaranteed data rate of 120kbps provides compatibility with popular software for communicating with personal computers.
the max3221/max3223/max3243 require only 0.1µf capacitors in 3.3v operation, and can operate from input voltages ranging from +3.0v to +5.5v. they are ideal for 3.3v-only systems, mixed 3.3v and 5.0v systems, or 5.0v-only systems that require true rs-232 performance.
the max3221 is a 1-driver/1-receiver 16-pin ssop version of the 20-pin max3223 (2-driver/2-receiver). the max3243 3-driver/5-receiver, complete serial port is ideal for notebook or subnotebook computers. the max3243 includes one complementary always-active receiver. this receiver can monitor an external device (such as a modem) in shutdown, without forward biasing the protection diodes in a uart that may have vcc completely removed.
max3221, max3223, max3243关键特性
for space-constrained applications: max3228/max3229: +2.5v to +5.5v rs-232 transceivers in ucsp™
for integrated esd protection: max3222e/max3232e/max3237e/max3241e*/ max3246e: ±15kv esd-protected, down to 10na, 3.0v to 5.5v, up to 1mbps, true rs-232 transceivers (max3246e available in ucsp package)
for low-voltage or data cable applications: max3380e/max3381e: +2.5v to +5.5v, 1µa, 2 tx/2 rx rs-232 transceivers with ±15kv esd-protected i/o and logic pins
max3221, max3223, max3243应用/使用
电池供电设备
手持式装置
笔记本电脑、亚笔记本电脑与掌上电脑
外设
打印机
max3221, max3223, max3243应用电路
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