3-V to 5.5-V Single-Channel RS-232 Line Driver/Receiver With +/-15-kV ESD Protection - TRS3221

TRS3221 (ACTIVE)

3-V to 5.5-V Single-Channel RS-232 Line Driver/Receiver With +/-15-kV ESD Protection

Features

  • RS-232 Bus-Pin ESD Protection Exceeds ±15 kV Using Human-Body Model (HBM)
  • Meets or Exceeds the Requirements ofTIA/EIA-232-F and ITU v.28 Standards
  • Operates With 3-V to 5.5-V VCC Supply
  • Operates Up To 250 kbit/s
  • One Driver and One Receiver
  • Low Standby Current . . . 1 µA Typical
  • External Capacitors . . . 4 × 0.1 µF
  • Accepts 5-V Logic Input With 3.3-V Supply
  • Alternative High-Speed Pin-Compatible Device (1 Mbit/s)
    • TRSF3221
  • Auto-Powerdown Feature Automatically Disables Drivers for Power Savings
  • APPLICATIONS
    • Battery-Powered, Hand-Held, and Portable Equipment
    • PDAs and Palmtop PCs
    • Notebooks, Subnotebooks, and Laptops
    • Digital Cameras
    • Mobile Phones and Wireless Devices

DESCRIPTION/ORDERING INFORMATION

The TRS3221 consists of one line driver, one line receiver, and a dual charge-pump circuit with ±15-kV ESD protection pin to pin (serial-port connection pins, including GND). 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. The charge pump and four small external capacitors allow operation from a single 3-V to 5.5-V supply. These devices operate 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 on the receiver input, the driver output is disabled. If FORCEOFF is set low and EN is high, both the driver and receiver 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. With auto-powerdown enabled, the device is activated automatically when a valid signal is applied to the receiver input. The INVALID output notifies the user if an RS-232 signal is present at the receiver input. INVALID is high (valid data) if the 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 the receiver input voltage is between -0.3 V and 0.3 V for more than 30 µs.

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Parametrics Compare all products in RS-232 Transceivers

 
Drivers Per Package
Receivers Per Package
ESD HBM (kV)
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
Rating
Power Saving Feature
IEC-61000-4-2 SUPPORT
TRS3221 TRS3221E TRS3222 TRS3222E
1     1     2     2    
1     1     2     2    
15     15     15     15    
-40 to 85
0 to 70    
-40 to 85
0 to 70    
0 to 70     -40 to 85
0 to 70    
16SSOP
16TSSOP    
16SSOP
16TSSOP    
20SSOP     20SOIC
20SSOP
20TSSOP    
0.88 | 1ku     0.88 | 1ku     1.28 | 1ku     1.28 | 1ku    
Catalog     Catalog     Catalog     Catalog    
Auto-Powerdown     Auto-Powerdown     Powerdown     Powerdown    
       
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