TRS3122ERGER

The TRS3122E is a two-driver and two-receiver RS232 interface device, with split supply pins for mixed-voltage operation. All RS-232 inputs and outputs are protected to ±15 kV using the IEC 61000-4-2 Air-Gap Discharge method, ±8 kV using the IEC 61000-4-2 Contact Discharge method, and ±15 kV using the Human-Body Model. The charge pump requires five small 0.1-μF capacitors for operation from as low as a 1.8-V supply. The TRS3122E is capable of running at data rates up to 1000 kbps, while maintaining RS-232-compatible output levels. The TRS3122E has a unique VL pin that allows operation in mixed-logic voltage systems. Both driver in (DIN) and receiver out (ROUT) logic levels are pin programmable through the VL pin. This eliminates the need for additional voltage level shifter while interfacing with low-voltage microcontrollers or UARTs. Auto Powerdown Plus automatically places the device in a low power mode when the device has not received or transmitted data for more than 30 seconds. This feature makes this device a very attractive option for battery powered or other power-sensitive applications.

Applications

• Remote Radio Unit (RRU)
• Base Band Unit (BBU)
• Electronic Point of Sale (EPOS)
• Diagnostics & Data Transmission
• Battery-Powered Equipment

Key features

• Extended VCC operating nodes: 1.8 V, 3.3 V, or 5.0 V
• Unique Tripler Charge Pump Architecture Enables Low VCC of 1.8V While Maintaining Compatibility with 3.3 V and 5 V Supplies
• Integrated Level-Shifting Functionality Eliminates the Need for External Power or Additional Level Shifter While Interfacing with Low-Voltage MCUs
• Enhanced ESD Protection on RIN Inputs and DOUT Outputs
• ±15 kV IEC 61000-4-2 Air-Gap Discharge ±8 kV IEC 61000-4-2 Contact Discharge ±15 kV Human-Body Model
• Specified 1000-kbps Data Rate
• Auto Powerdown Plus Feature
• Low 0.5uA Shutdown Supply Current
• Meets or Exceeds Compatibility Requirements of RS-232 Interface