TRS3122E Datasheet, PDF (1/28 Pages) Texas Instruments – 1.8 V Low Power Dual RS-232 Transceiver

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TRS3122E
SLLSET7C – MAY 2016 – REVISED MAY 2016
TRS3122E 1.8 V Low Power Dual RS-232 Transceiver
1 Features
•1 Extended V_CC operating nodes: 1.8 V, 3.3 V, or
5.0 V
– Unique Tripler Charge Pump Architecture
Enables Low V_CC 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
• For 2.5 V Single Supply Applications, Consider
TRS3318E as an Optimized Solution
2 Applications
• Remote Radio Unit (RRU)
• Base Band Unit (BBU)
• Electronic Point of Sale (EPOS)
• Diagnostics & Data Transmission
• Battery-Powered Equipment
3 Description
The TRS3122E is a two-driver and two-receiver RS-
232 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 V_L pin that allows
operation in mixed-logic voltage systems. Both driver
in (DIN) and receiver out (ROUT) logic levels are pin
programmable through the V_L 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.
Device Information⁽¹⁾
PART NUMBER
PACKAGE (PINS) BODY SIZE (NOM)
TRS3122ERGER
RGE (24)
4.00 mm × 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Feature Diagram
Logic Supply
VL
1.8V, 3.3V, 5V
POWER
FORCEON
FORCEOFF
AUTO-
POWERDOWN
PLUS
DIN ²
2
ROUT
TX
2 _DOUT
RS232
1000 kb/s
RX
2
RIN
RS232
INVALID
STATUS
Copyright © 2016, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.