MAXIM MAX3189EUT

The MAX3188/MAX3189 single RS-232 transmitters in a SOT23-6 package are for space- and cost-constrained applications requiring minimal RS-232 communications. These devices consume only 150µA of supply current from ±4.5V to ±6V supplies. RS-232 data transmission is guaranteed up to 250kbps with the MAX3188 and up to 1Mbps with the MAX3189. The MAX3188/MAX3189 transmitters are inverting level translators that convert CMOS-logic levels to 5V EIA/TIA-232 levels. They feature a shutdown input that reduces current consumption to only 1µA and forces the transmitter output into a high-impedance state. The MAX3188/MAX3189 transmitters have a standard inverting output. The transmitter is an inverting level translator that converts CMOS-logic levels to 5V EIA/TIA-232 levels. The MAX3188 guarantees a 250kbps data rate, and the MAX3189 guarantees a 1Mbps data rate with worst-case loads of 3kΩ in parallel with 1000pF. The transmitter input does not have a pull-up resistor and should be connected to GND if unused. The MAX3188/MAX3189 feature a shutdown input. Drive SHDN low to reduce the supply current to 1µA (max). Shutdown also forces TOUT into a high-impedance state that allows the signal line to be safely controlled by other transmitters. Drive SHDN high for normal operation. The MAX3188/MAX3189 require ±4.5V to ±6V dual supplies. For applications where these supply voltages are not present, a DC-DC converter must be added. Due to the devices’ low current consumption, a charge pump can provide the proper supply voltages and requires a minimal amount of board space and cost.

• Small 6-Pin SOT23 Package
• 150µA Supply Current
• Shutdown Reduces Supply Current to 1µA
• Guaranteed Data Rate 1Mbps (MAX3189) 250kbps (MAX3188)
• Three-State RS-232 Transmitter Output
• No External Components Required

• Diagnostic Ports
• Telecommunications Networking Equipment
• Set-Top Boxes
• Digital Cameras
• Hand-Held Equipment