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2.5-V 460-Kbps RS-232 Transceiver With +/-15-kV ESD Protection


Package | PIN: PW | 20
Temp: C (0 to 70)
Carrier: Partial Tube
Qty Price
1-9 $2.69
10-24 $2.43
25-99 $2.26
100-249 $1.98
250-499 $1.86
500-749 $1.58
750-999 $1.33
1000+ $1.27


  • ESD Protection for RS-232 I/O Pins
    • ±15 kV (Human-Body Model)
    • ±8 kV (IEC 61000-4-2, Contact Discharge)
    • ±15 kV (IEC 61000-4-2, Air-Gap Discharge)
  • 300-µA Operating Supply Current
  • 1-µA Low-Power Standby Mode (With Receivers Active)
  • Designed to Transmit at a Data Rate of
    460 kbps
  • Auto-Powerdown Plus Option Features Flexible Power-Saving Mode
  • Operates From a Single 2.25-V to 3-V VCC Supply
  • Designed to be Interchangeable With Industry Standard '3318 Devices

Texas Instruments  TRS3318ECPW

The TRS3318E is a dual-driver, dual-receiver, RS-232-compatible transceiver. The device features auto-powerdown plus and enhanced electrostatic discharge (ESD) protection integrated into the chip. Driver output and receiver input 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 (HBM).

The device operates at a data rate of 460 kbps. The transceiver has a proprietary low-dropout driver output stage, enabling RS-232-compatible operation from a 2.25-V to 3-V supply with a dual charge pump. The charge pump requires only four 0.1-µF capacitors and features a logic-level output (READY) that asserts when the charge pump is regulating and the device is ready to begin transmitting.

The TRS3318E achieves a 1-µA supply current using the auto-powerdown feature. This device automatically enters a low-power power-down mode when the RS-232 cable is disconnected or the drivers of the connected peripherals are inactive for more than 30 s. The device turns on again when it senses a valid transition at any driver or receiver input. Auto-powerdown saves power without changes to the existing BIOS or operating system.

This device is available in two space-saving packages: 20-pin SSOP and 20-pin TSSOP.