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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) 1000 Main supply voltage (Nom) (V) 3.3, 5 Features Auto-Powerdown ESD HBM (kV) 15 Rating Catalog Operating temperature range (C) -40 to 85 Vout (Typ) (V) 5.4 open-in-new Find other RS-232 transceivers

Package | Pins | Size

SSOP (DB) 28 54 mm² 5.3 x 10.2 TSSOP (PW) 28 62 mm² 9.7 x 6.4 open-in-new Find other RS-232 transceivers

Features

  • Operates With 3-V to 5.5-V VCC Supply
  • Always-Active Noninverting Receiver Output (ROUT2B)
  • Low Standby Current . . . 1 µA Typ
  • External Capacitors . . . 4 × 0.1 µF
  • Accepts 5-V Logic Input With 3.3-V Supply
  • Inter-Operable With SN65C3238, SN75C3238
  • Supports Operation From 250 kbit/s to
    1 Mbit/s
  • RS-232 Bus-Pin ESD Protection Exceeds
    ±15 kV Using Human-Body Model (HBM)
  • Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
  • APPLICATIONS
    • Battery-Powered Systems
    • PDAs
    • Notebooks
    • Laptops
    • Palmtop PCs
    • Hand-Held Equipment

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Description

The TRSF3243 consists of three line drivers, five line receivers, and a dual charge-pump circuit with ±15-kV ESD protection pin to pin (serial-port connection pins, including GND). This device provides the electrical interface between an asynchronous communication controller and the serial-port connector. The charge pump and four small external capacitors allow operation from a single 3-V to 5.5-V supply. In addition, this 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 1 Mbit/s and an increased slew-rate range of 24 V/µs to 150 V/µs.

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.

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Technical documentation

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Type Title Date
* Data sheet 3-V to 5.5-V Multichannel RS-232 Compatible Line Driver/Receiver datasheet (Rev. A) Sep. 16, 2008
* Errata Datasheet Errata for SN65/75C3223 SN65/75C3232 SN65/75C3243 TRSF3223/3232/3243 Nov. 13, 2008

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SSOP (DB) 28 View options
TSSOP (PW) 28 View options

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