UM3243EEASR英联UNION一级代理-恩优科技ENYO

Key Specifications

Product Description

 The UM3243 series are 3-driver/5-receiver 3V-5.5V powered RS-232 transceivers featuring Auto Power-Off and low supply current, when no valid RS-232 level signal is sensed on any receiver inputs, the charge pump circuit and drivers will be powered off. Disconnection of the RS-232 cable or poweroff of the transmitters of the attaching peripherals will lead to Power-Off mode. When a valid level is applied to any RS-232 receiver inputs, the chip will turn on again. The Auto Power-Off mode helps to save power without changing the existing system.

The UM3243 transceivers have a regulated discontinuous mode dual charge pump power supply and low-dropout transmitters, which combine to deliver true RS-232 performance from a single +3V to +5.5V supply. Data rate of 250kbps is guaranteed.

The UM3243 needs only four 0.1μF capacitors in 3.3V operation, and can operate from input voltages ranging from +2.7V 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 or EIA/TIA-562 levels of ±3.7V with supply voltages as low as 2.7V.

The UM3243 includes one complementary always-active receiver. This receiver can monitor an external device (such as a modem) in Power-Off. The UM3243 also includes an always-active INVALID_________________ output which indicates valid RS-232 signal levels on any receiver inputs. It is usually used in UART wakeup. The UM3243 also features enhanced ESD protection with ±15kV for human body mode and ±8kV for IEC61000-4-2 contact discharge mode.

 Features

 - Meets True EIA/TIA-232-F Standards from a +3.0V to +5.5V Power Supply

- Meets EIA/TIA-562 Levels of ±3.7V with Supply Voltages as Low as 2.7V

- Auto Power-Off Feature to Disable Driver Outputs when No Valid RS-232 Signal is Sensed

- 250kbps Minimum Transmission Rate

- 0.1μA (Typ) Low Power-Off Current

- Accepts 5V Logic Input with 3.3V Supply

- Latch-Up Performance Exceeds 200mA

- Enhanced ESD Specifications for RS-232 Pins:

  ±15kV Human Body Mode

  ±8kV IEC61000-4-2 Contact Discharge Mode
- Available in SSOP28, TSSOP28, SOP28 and QFN32 Packages

 Pin Configurations  

                       SSOP28

Function Tables

Table 1. Each Transmitter (Note 1)

Note 1: H=high level, L=low level, X=irrelevant, Z=high impedance

 Table 2. Each Receiver (Note 2)

  Table 3. ROUT2B and Outputs INVALID________________ (Note 2)

Note 2: H=high level, L=low level, X=irrelevant, Z=high impedance (off), Open=input disconnected or connected driver off.

 Ordering Information

       深圳市恩优科技有限公司（ENYO恩优）一直致力于智能电子产品方案设计，以及国际半导体厂家产品在国内的推广、销售。建立了卓越的全球采购渠道，在深圳、香港均自设有仓储物流中心。并取得了上海英联（UNION）、复旦微（FM）、芯天下（XTX）、正基（AMPAK）的代理资格。产品类别包括双路、四路、八路电平转换芯片、RS232和RS485串口芯片、LDO、ESD保护、EEPROM、NOR FLASH、NAND FLASH、射频读卡芯片、漏电保护器件等。产品广泛应用于消费类平板电子、汽车电子、安防、Pos机、网络通信、工控电脑、电力电表等行业的应用。

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