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  • TRS3253E RS-232 Transceiver With Split Supply Pin for Logic Side

    • SLLS850D January   2008  – March 2017 TRS3253E

      PRODUCTION DATA.  

  • CONTENTS
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  • TRS3253E RS-232 Transceiver With Split Supply Pin for Logic Side
  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  ESD Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  Electrical Characteristics—Power
    6. 6.6  Electrical Characteristics—Driver
    7. 6.7  Electrical Characteristics—Receiver
    8. 6.8  Electrical Characteristics—Status
    9. 6.9  Switching Characteristics—Driver
    10. 6.10 Switching Characteristics—Receiver
    11. 6.11 Switching Characteristics—Power and Status
    12. 6.12 Typical Characteristics
  7. 7 Parameter Measurement Information
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Power
      2. 8.3.2 RS232 Driver
      3. 8.3.3 RS232 Receiver
      4. 8.3.4 RS232 Status
    4. 8.4 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
      3. 9.2.3 Application Curve
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Receiving Notification of Documentation Updates
    2. 12.2 Community Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information
  14. IMPORTANT NOTICE

Package Options

Mechanical Data (Package|Pins)
  • RSM|32
    • MPQF195B
Thermal pad, mechanical data (Package|Pins)
  • RSM|32
    • QFND112H
Orderable Information
  • slls850d_oa
  • slls850d_pm
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DATA SHEET

TRS3253E RS-232 Transceiver With Split Supply Pin for Logic Side

1 Features

  • VL Pin for Compatibility With Mixed-Voltage Systems Down to 1.8 V on Logic Side
  • 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
  • Low 300-μA Supply Current
  • Specified 1000-kbps Data Rate
  • Auto Powerdown Plus Feature

2 Applications

  • Hand-Held Equipment
  • Cell Phones
  • Battery-Powered Equipment
  • Data Cables
  • POS Equipment
  • HDMI Switch Matrix
  • Debug Ports

3 Description

The TRS3253E device is a three-driver and five-receiver RS-232 interface device, with split supply pins for mixed-signal operations without needing an external voltage translator. 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 only four capacitors for operation from a single 3.3-V or 5-V supply. The TRS3253E is capable of running at data rates up to 1000 kbps, while maintaining RS-232 compliant output levels.

The TRS3253E is available in a space-saving VQFN package (4-mm × 4-mm RSM).

Auto-powerdown-plus automatically powers down drivers to reduce power after 30 seconds of inactivity. In powerdown state supply current is 10 μA maximum.

Receiver input voltage status is available on INVALID logic output even when the device is in powerdown state.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
TRS3253ERSM VQFN (32) 2.80 mm × 2.80 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Simplified Diagram

TRS3253E trs3253e_mini2.gif

4 Revision History

Changes from C Revision (June 2015) to D Revision

  • Changed "IEC61000-4-2, Contact Discharge" from "8 kV" to "15 kV" in Features, Description, Overview and ESD RatingsGo

Changes from B Revision (December 2013) to C Revision

  • Added Device Information table, Pin Functions table, ESD Ratings table, Thermal Information table, Typical Characteristics, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section.Go

5 Pin Configuration and Functions

RSM Package
32-Pin VQFN
Top View
TRS3253E ponn_lls850.gif
Power pad can be connected to GND or floating.
NC – No internal connection.

Pin Functions

PIN I/O DESCRIPTION
NAME NO.
C1+ 29 — Positive terminals of the voltage-doubler charge-pump capacitors
C2+ 1
C1– 31 — Negative terminals of the voltage-doubler charge-pump capacitors
C2– 2
DIN1 4 I Driver inputs
DIN2 5
DIN3 7
DOUT1 25 O RS-232 driver outputs
DOUT2 23
DOUT3 22
FORCEOFF 28 I Auto-powerdown-plus control input
FORCEON 9 I Auto-powerdown-plus control input
GND 26 — Ground
INVALID 6 O Invalid output pin. Active low when all RIN inputs are unpowered
NC 8 — No connect pins (do not connect to these pins)
16
24
32
RIN1 21 I RS-232 receiver inputs
RIN2 20
RIN3 19
RIN4 18
RIN5 17
ROUT1 14 O Receiver outputs. Swing between 0 and VL
ROUT2 13
ROUT3 12
ROUT4 11
ROUT5 10
VCC 27 — 3-V to 5.5-V supply voltage
VL 15 — Logic-level supply. All CMOS inputs and outputs are referenced to this supply
V+ 30 O 5.5-V supply generated by the charge pump
V– 3 O –5.5-V supply generated by the charge pump

6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)(1)
MIN MAX UNIT
VCC to GND –0.3 6 V
VL to GND –0.3 VCC + 0.3
V+ to GND –0.3 7
V– to GND 0.3 –7
V+ + |V–|(2) 13
VI Input voltage DIN, FORCEOFF, and FORCEON to GND –0.3 6 V
RIN to GND ±25
VO Output voltage DOUT to GND ±13.2 V
ROUT to GND –0.3 VL + 0.3
Continuous power dissipation TA = 85°C, 32-pin RSM (RθJA = 37.2°C/W)(3) 1747 mW
TJ Junction temperature 150 °C
Tstg Storage temperature –65 150 °C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability..
(2) V+ and V– can have maximum magnitudes of 7 V, but their absolute difference cannot exceed 13 V.
(3) Maximum power dissipation is a function of TJ(max), RθJA, and TA. The maximum allowable power dissipation at any allowable ambient temperature is PD = (TJ(max) – TA) / RθJA. Operating at the absolute maximum TJ of 150°C can affect reliability.

6.2 ESD Ratings

VALUE UNIT
V(ESD) Electrostatic discharge Human body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) All pins except 17 to 23 and 25 ±2000 V
Pins 17 to 23 and 25 ±15000
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) All pins ±1500
IEC61000-4-2, Contact discharge Pins 17 to 23 and 25 ±8000
IEC61000-4-2, Air-gap discharge Pins 17 to 23 and 25 ±15000
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

6.3 Recommended Operating Conditions

MIN MAX UNIT
VCC Supply voltage 3 5.5 V
VL Supply voltage 1.65 VCC V
Input logic low DIN, FORCEOFF, FORCEON VL = 3 V or 5.5 V 0 0.8 V
VL = 2.3 V 0 0.6
VL = 1.65 V 0 0.5
Input logic high DIN, FORCEOFF, FORCEON VL = 5.5 V 2.4 VL V
VL = 3 V 2 VL
VL = 2.7 V 1.4 VL
VL = 1.95 V 1.25 VL
Operating temperature TRS3253EIRSMR –40 85 °C
Receiver input voltage –25 25 V

6.4 Thermal Information

THERMAL METRIC(1) TRS3253E UNIT
RSM (VQFN)
32 PINS
RθJA Junction-to-ambient thermal resistance 37.2 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 30.1 °C/W
RθJB Junction-to-board thermal resistance 7.8 °C/W
ψJT Junction-to-top characterization parameter 0.4 °C/W
ψJB Junction-to-board characterization parameter 7.6 °C/W
RθJC(bot) Junction-to-case (bottom) thermal resistance 2.4 °C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report.

6.5 Electrical Characteristics—Power

over operating free-air temperature range, VCC = VL = 3 V to 5.5 V, C1–C4 = 0.1 μF (tested at 3.3 V ± 10%), C1 = 0.047 μF, C2–C4 = 0.33 μF (tested at 5 V ± 10%) (unless otherwise noted)(1)
PARAMETER TEST CONDITIONS MIN TYP(2) MAX UNIT
II Input leakage current FORCEOFF, FORCEON ±0.01 ±1 μA
ICC Supply current
(TA = 25°C)		 Auto-powerdown plus disabled No load,
FORCEOFF and FORCEON at VCC 		0.5 1 mA
Powered off No load, FORCEOFF at GND 1 10 μA
Auto-powerdown plus active No load, FORCEOFF at VCC,
FORCEON at GND,
All RIN are open or grounded		 1 10
(1) Testing supply conditions are C1–C4 = 0.1 μF at VCC = 3.3 V ± 0.15 V; C1–C4 = 0.22 μF at VCC = 3.3 V ± 0.3 V; and C1 = 0.047 μF and C2–C4 = 0.33 μF at VCC = 5 V ± 0.5 V. (See Figure 8)
(2) All typical values are at VCC = 3.3 V or VCC = 5 V, and TA = 25°C.

6.6 Electrical Characteristics—Driver

over operating free-air temperature range, VCC = VL = 3 V to 5.5 V, C1–C4 = 0.1 μF (tested at 3.3 V ± 10%), C1 = 0.047 μF, C2–C4 = 0.33 μF (tested at 5 V ± 10%), TA = TMIN to TMAX (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP(1) MAX UNIT
VOH Output voltage swing All driver outputs loaded with 3 kΩ to ground, VCC= 3.1V to 5.5V ±5 ±5.4 V
rO Output resistance VCC = V+ = V–  = 0, Driver output = ±2 V 300 10M Ω
IOS Output short-circuit current VT_OUT = 0 ±60 mA
IOZ Output leakage current VT_OUT = ±12 V, FORCEOFF = GND,
VCC = 3 V to 3.6 V		 ±25 μA
VT_OUT = ±12 V, FORCEOFF = GND,
VCC = 4.5 V to 5.5 V
Driver input hysteresis 0.5 V
Input leakage current DIN, FORCEOFF, FORCEON ±0.01 ±1 μA
(1) Typical values are at VCC = VL = 3.3 V, TA = 25°C

6.7 Electrical Characteristics—Receiver

over operating free-air temperature range, VCC = VL = 3 V to 5.5 V, C1–C4 = 0.1 μF (tested at 3.3 V ± 10%), C1 = 0.047 μF, C2–C4 = 0.33 μF (tested at 5 V ± 10%), TA = TMIN to TMAX (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP(1) MAX UNIT
Ioff Output leakage current ROUT, receivers disabled ±0.05 ±10 μA
VOL Output voltage low IOUT = 1.6 mA 0.4 V
VOH Output voltage high IOUT = –1 mA VL – 0.6 VL – 0.1 V
VIT– Input threshold low TA = 25°C VL = 5 V 0.8 1.2 V
VL = 3.3 V 0.6 1.5
VIT+ Input threshold high TA = 25°C VL = 5 V 1.8 2.4 V
VL = 3.3 V 1.5 2.4
Vhys Input hysteresis 0.5 V
Input resistance TA = 25°C 3 5 7 kΩ
(1) Typical values are at VCC = VL = 3.3 V, TA = 25°C

6.8 Electrical Characteristics—Status

over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN MAX UNIT
VIT+(valid) Receiver input threshold
for INVALID high-level output voltage		 FORCEON = GND, FORCEOFF = VL 2.7 V
VIT–(valid) Receiver input threshold
for INVALID high-level output voltage		 FORCEON = GND, FORCEOFF = VL –2.7 V
VT(invalid) Receiver input threshold
for INVALID low-level output voltage		 FORCEON = GND, FORCEOFF = VL –0.3 0.3 V
VOH INVALID high-level output voltage IOH = –1 mA, FORCEON = GND,
FORCEOFF = VL 		VL – 0.6 V
VOL INVALID low-level output voltage IOL = 1.6 mA, FORCEON = GND,
FORCEOFF = VL 		0.4 V

6.9 Switching Characteristics—Driver

over operating free-air temperature range, VCC = VL = 3 V to 5.5 V, C1–C4 = 0.1 μF (tested at 3.3 V ± 10%), C1 = 0.047 μF, C2–C4 = 0.33 μF (tested at 5 V ± 10%), TA = TMIN to TMAX (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP(1) MAX UNIT
Maximum data rate RL = 3 kΩ, CL = 200 pF, one driver switching 1000 kbps
Time-to-exit powerdown |VT_OUT| > 3.7 V 100 μs
|tPHL – tPLH| Driver skew(2) 100 ns
Transition-region
slew rate		 VCC = 3.3 V,
TA = 25°C,
RL = 3 kΩ to 7 kΩ,
Measured from 3 V
to –3 V or –3 V to 3 V 		CL = 150 pF to 1000 pF 15 150 V/μs
(1) Typical values are at VCC = VL = 3.3 V, TA = 25°C.
(2) Driver skew is measured at the driver zero crosspoint.

6.10 Switching Characteristics—Receiver

over operating free-air temperature range, VCC = VL = 3 V to 5.5 V, C1–C4 = 0.1 μF (tested at 3.3 V ± 10%), C1 = 0.047 μF, C2–C4 = 0.33 μF (tested at 5 V ± 10%), TA = TMIN to TMAX (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP(1) MAX UNIT
tPHL Receiver propagation delay Receiver input to receiver output, CL = 150 pF 0.15 μs
tPLH 0.15
tPHL – tPLH Receiver skew 50 ns
ten Receiver output enable time From FORCEOFF 200
tdis Receiver output disable time From FORCEOFF 200
(1) Typical values are at VCC = VL = 3.3 V, TA = 25°C.

6.11 Switching Characteristics—Power and Status

over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) (see Figure 7)
PARAMETER MIN TYP(1) MAX UNIT
tvalid Propagation delay time, low- to high-level output 0.1 μs
tinvalid Propagation delay time, high- to low-level output 50
ten Supply enable time 25
tdis Receiver or driver edge to auto-powerdown plus 15 30 60 s
(1) All typical values are at VCC = VL = 3.3 V and TA = 25°C.

6.12 Typical Characteristics

VCC = 3.3 V
TRS3253E C001_VOH.png
Figure 1. DOUT VOH vs Load Current
Other Drivers 3-kΩ Load
TRS3253E C001_VOL.png
Figure 2. DOUT VOL vs Load Current
Other Drivers 3-kΩ Load

7 Parameter Measurement Information

TRS3253E pmi1_lls797.gif
A. CL includes probe and jig capacitance.
B. The pulse generator has the following characteristics: PRR = 250 kbit/s, ZO = 50 Ω, 50% duty cycle, tr  ≤ 10 ns,
tf  ≤ 10 ns.
Figure 3. Driver Slew Rate
TRS3253E pmi2_lls797.gif
A. CL includes probe and jig capacitance.
B. The pulse generator has the following characteristics: PRR = 250 kbit/s, ZO = 50 Ω, 50% duty cycle, tr  ≤ 10 ns,
tf  ≤ 10 ns.
Figure 4. Driver Pulse Skew
TRS3253E pmi3_lls797.gif
A. CL includes probe and jig capacitance.
B. The pulse generator has the following characteristics: ZO = 50 Ω, 50% duty cycle, tr  ≤ 10 ns, tf  ≤ 10 ns.
Figure 5. Receiver Propagation Delay Times
TRS3253E pmi4_lls797.gif
A. CL includes probe and jig capacitance.
B. The pulse generator has the following characteristics: ZO = 50 Ω, 50% duty cycle, tr  ≤ 10 ns, tf  ≤ 10 ns.
C. tPLZ and tPHZ are the same as tdis.
D. tPZL and tPZH are the same as ten.
Figure 6. Receiver Enable and Disable Times
TRS3253E pmi5_lls797.gif Figure 7. INVALID Propagation-Delay Times and Supply-Enabling Time

 
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