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Product details

Parameters

Drivers per package 3 Receivers per package 5 Logic voltage (Min) (V) 3.3 Data rate (Max) (kbps) 600 Main supply voltage (Nom) (V) 3.3, 5 Features Auto-Powerdown ESD HBM (kV) 15 Rating Catalog Operating temperature range (C) -40 to 85, 0 to 70 open-in-new Find other RS-232 transceivers

Package | Pins | Size

SOIC (DW) 28 184 mm² 17.9 x 10.3 SSOP (DB) 28 54 mm² 5.3 x 10.2 TSSOP (PW) 28 62 mm² 9.7 x 6.4 VQFN (RHB) 32 25 mm² 5.0 x 5.0 open-in-new Find other RS-232 transceivers

Features

  • Single-Chip and Single-Supply Interface for IBM PC/AT Serial Port
  • ESD Protection for RS-232 Bus Pins
    • ±15-kV Human-Body Model (HBM)
    • ±8-kV IEC61000-4-2, Contact Discharge
    • ±15-kV IEC61000-4-2, Air-Gap Discharge
  • Meets or Exceeds Requirements of TIA/EIA-232-F and ITU v.28 Standards
  • Operates With 3-V to 5.5-V VCC Supply
  • Always-Active Noninverting Receiver Output (ROUT2B)
  • Designed to Transmit at a Data Rate up to 500 kbit/s
  • Low Standby Current . . . 1 µA Typ
  • External Capacitors . . . 4 × 0.1 µF
  • Accepts 5-V Logic Input With 3.3-V Supply
  • Designed to Be Interchangeable With Industry Standard '3243E Devices
  • Serial-Mouse Driveability
  • Auto-Powerdown Feature to Disable Driver Outputs When No Valid RS-232 Signal Is Sensed
  • Package Options Include Plastic Small-Outline (DW), Shrink Small-Outline (DB),
    and Thin Shrink Small-Outline (PW) Packages
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Description

The TRS3243E device consists of three line drivers, five line receivers, and a dual charge-pump circuit with ±15-kV ESD (HBM and IEC61000-4-2, Air-Gap Discharge) and ±8-kV ESD (IEC61000-4-2, Contact Discharge) protection on serial-port connection pins. The device meets the requirements of TIA/EIA-232-F and provides the electrical interface between an asynchronous communication controller and the serial-port connector. This combination of drivers and receivers matches that needed for the typical serial port used in an IBM PC/AT, or compatible. The charge pump and four small external capacitors allow operation from a single 3-V to 5.5-V supply. In addition, the device includes an always-active noninverting output (ROUT2B), which allows applications using the ring indicator to transmit data while the device is powered down. The device operates at data signaling rates up to 250 kbit/s and a maximum of 30-V/µs driver output slew rate.

Flexible control options for power management are available when the serial port is inactive. The auto-powerdown feature functions when FORCEON is low and FORCEOFF is high. During this mode of operation, if the device does not sense a valid RS-232 signal, the driver outputs are disabled. If FORCEOFF is set low, both drivers and receivers (except ROUT2B) are shut off, and the supply current is reduced to 1 µA. Disconnecting the serial port or turning off the peripheral drivers causes the auto-powerdown condition to occur.

Auto-powerdown can be disabled when FORCEON and FORCEOFF are high, and should be done when driving a serial mouse. With auto-powerdown enabled, the device is activated automatically when a valid signal is applied to any receiver input. The INVALID output is used to notify the user if an RS-232 signal is present at any receiver 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.

The TRS3243EC is characterized for operation from 0°C to 70°C. The TRS3243EI is characterized for operation from –40°C to 85°C.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 8
Type Title Date
* Datasheet 3-V to 5.5-V Multichannel RS-232 Line Driver/Receiver, TRS3243E datasheet (Rev. C) Oct. 09, 2011
Technical articles How the RS-232 transceiver’s regulated charge-pump circuitry works Jun. 28, 2018
Application note AN-438 Low Power RS-232C Driver and Receiver in CMOS (Rev. B) Apr. 26, 2013
Application note Understanding Power Requirements in RS-232 Applications (Rev. B) Apr. 26, 2013
Application note Removing Ground Noise in Data Transmission Systems Oct. 05, 2007
More literature RS-232 IEC ESD-Protected Devices From TI (Rev. A) Jul. 27, 2007
Application note Interface Circuits for TIA/EIA-232-F (Rev. A) Sep. 19, 2002
Application note Low-Voltage, Single-Supply 232-Standard Interface Solutions (Rev. A) Sep. 19, 2000

Design & development

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Design tools & simulation

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Reference designs

REFERENCE DESIGNS Download
Reference Design for Converting RS-232 Signaling to RS-485 Signaling
TIDA-060008 — This reference design provides a circuit of converting RS-232 signaling to RS-485 signaling. This allows for long-distance communication, since the range supported by RS-232 is normally less than 50 feet while the range for RS-485's can exceed 1000 feet. The design implements bidirectional (...)
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REFERENCE DESIGNS Download
RS-232 Modem Interface Module for Protection Relay, IED, and Substation Automation Reference Design
TIDA-00557 The TIDA-00557 reference design provides an interface for a true RS-232 (eight signal + ground) physical layer interface for data terminal equipment (DTE) using a DB-9 plug-type connector with a provision for a data communication equipment (DCE) interface. This is intended for smart grid (...)
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REFERENCE DESIGNS Download
RS-485 / RS-232 Multiprotocol Transceiver Reference Design
TIDA-00540 This design (TIDA-00540) allows for communication over RS-485 or RS-232 data buses without requiring separate wiring for each.  Data lines are shared between two different transceiver types, and a single control signal is used to determine which protocol is to be used.
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CAD/CAE symbols

Package Pins Download
SOIC (DW) 28 View options
SSOP (DB) 28 View options
TSSOP (PW) 28 View options
VQFN (RHB) 32 View options

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