TRS3253E_10 Datasheet, PDF (1/17 Pages) Texas Instruments – RS-232 TRANSCEIVER WITH SPLIT SUPPLY PIN FOR LOGIC SIDE

TRS3253E
www.ti.com
SLLS850B – JANUARY 2008 – REVISED NOVEMBER 2009
RS-232 TRANSCEIVER WITH SPLIT SUPPLY PIN FOR LOGIC SIDE
Check for Samples: TRS3253E
FEATURES
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• V_L Pin for Compatibility With Mixed-Voltage
Systems Down to 1.8 V on Logic Side
• Enhanced ESD Protection on RIN Inputs and
DOUT Outputs
– ±8 kV IEC 61000-4-2 Air-Gap Discharge
– ±8 kV IEC 61000-4-2 Contact Discharge
– ±15 kV Human-Body Model
• Low 300-μA Supply Current
• Specified 1000-kbps Data Rate
• Auto Powerdown Plus Feature
APPLICATIONS
• Hand-Held Equipment
• PDAs
• Cell Phones
• Battery-Powered Equipment
• Data Cables
RSM PACKAGE
(TOP VIEW)
32 31 30 29 28 27 26 25
C2+ 1
C2– 2
V– 3
DIN1 4
DIN2 5
INVALID 6
DIN3 7
NC 8
24 NC
23 DOUT2
22 DOUT3
21 RIN1
20 RIN2
19 RIN3
18 RIN4
17 RIN5
9 10 11 12 13 14 15 16
NC – No internal connection
DESCRIPTION/ORDERING INFORMATION
The TRS3253E is a three-driver and five-receiver RS-232 interface device, with split supply pins for mixed-signal
operations. All RS-232 inputs and outputs are protected to ±8 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 only four small 0.1-μF capacitors for operation from a 3.3-V supply. The TRS3253E is
capable of running at data rates up to 1000 kbps, while maintaining RS-232-compliant output levels.
The TRS3253E 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 microcontroller or UARTs. The TRS3253E is
available in a space-saving QFN package (4 mm × 4 mm RSM).
Auto-powerdown plus can be disabled when FORCEON and FORCEOFF are high. With auto-powerdown plus
enabled, the device activates automatically when a valid signal is applied to any receiver or driver input. INVALID
is high (valid data) if any receiver input voltage is greater than 2.7 V or less than –2.7 V, or has been between
–0.3 V and 0.3 V for less than 30 μs. INVALID is low (invalid data) if all receiver input voltages are between –0.3
V and 0.3 V for more than 30 μs. Refer to Figure 5 for receiver input levels.
T_A
–40°C to 85°C
PACKAGE^{(1) (2)}
QFN – RSM
ORDERING INFORMATION
ORDERABLE PART NUMBER
TRS3253EIRSMR
TOP-SIDE MARKING
RS53EI
(1) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
(2) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
website at www.ti.com.
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008–2009, Texas Instruments Incorporated