MAXIM MAX3228/3229 说明书
The MAX3228/MAX3229 are +2.5V to +5.5V powered EIA/TIA-232 and V.28/V.24 communications interfaces with low power requirements, and high data-rate capa- bilities, in a chip-scale package (UCSP™). The MAX3228/MAX3229 achieve a 1µA supply current with Maxim’s AutoShutdown™ feature. They save power without changes to existing BIOS or operating systems by entering low-power shutdown mode when the RS-232 cable is disconnected, or when the trans- mitters of the connected peripherals are off. The transceivers have a proprietary low-dropout trans- mitter output stage, delivering RS-232 compliant perfor- mance from a +3.1V to +5.5V supply, and RS-232 compatible performance with a supply voltage as low as +2.5V. The dual charge pump requires only four small 0.1µF capacitors for operation from a +3.0V sup- ply. Each device is guaranteed to run at data rates of 250kbps while maintaining RS-232 output levels. The MAX3228/MAX3229 offer a separate power-supply input for the logic interface, allowing configurable logic levels on the receiver outputs and transmitter inputs. Operating over a +1.65V to VCC range, VL provides the MAX3228/MAX3229 compatibility with multiple logic families. The MAX3229 contains one receiver and one transmit- ter. The MAX3228 contains two receivers and two transmitters. The MAX3228/MAX3229 are available in tiny chip-scale packaging and are specified across the extended industrial temperature range of -40°C to +85°C.