Packaging information
| Package | Pins SSOP (DB) | 20 |
| Operating temperature range (°C) -40 to 85 |
| Package qty | Carrier 2,000 | LARGE T&R |
Features for the TRSF3223E
- ESD protection for RS-232 bus pins
- ±15-kV Human-body model (HBM)
- ±8-kV IEC 61000-4-2, contact discharge
- ±15-kV IEC 61000-4-2, Air-gap discharge
- Meets or exceeds the requirements of TIA/EIA-232-F and ITU v.28 standards
- Operates with 3-V to 5.5-V V CC supply
- Operates up to 1000 kbit/s
- Two drivers and two receivers
- Low standby current: 1 µA Typical
- External capacitors: 4 × 0.1 µF
- Accepts 5-V logic input with 3.3-V supply
Description for the TRSF3223E
The TRSF3223E consists of two line drivers, two line receivers, and a dual charge-pump circuit with ±15-kV ESD protection pin to pin (serial-port connection pins, including GND). This 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. The TRSF3223E operates at typical data signaling rates up to 1000 kbits.
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 and EN is high, both drivers and receivers are shut off, and the supply current is reduced to 1 mA. Disconnecting the serial port or turning off the peripheral drivers causes auto-powerdown to occur. Auto-powerdown can be disabled when FORCEON and FORCEOFF are high. With auto-powerdown enabled, the device is automatically activated 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 the receiver input voltage is between –0.3 V and 0.3 V for more than 30 µs. Refer to for receiver input levels.