TRSF3221 Datasheet | Texas Instruments

.ti. TRSF3221 3-V TO 5.5-V SINGLE-CHANNEL RS-232 PATIBLE LINE DRIVER/RECEIVER SLLS857 - AUGUST 2007 Features - Operates With 3-V to 5.5-V VCC Supply - Operates up to 1 Mbit/s - Low Standby Current . . . 1 μA Typ - External Capacitors . . . 4 × 0.1 μF - Accepts 5-V Logic Input With 3.3-V Supply - RS-232 Bus-Pin ESD Protection Exceeds ±15 k V Using Human-Body Model (HBM) - Auto-Powerdown Feature Automatically Disables Drivers for Power Savings APPLICATIONS - Battery-Powered, Hand-Held, and Portable Equipment - PDAs and Palmtop PCs - Notebooks, Sub-Notebooks, and Laptops - Digital Cameras - Mobile Phones and Wireless Devices DB OR PW PACKAGE (TOP VIEW) EN 1 C1+ 2 V+ 3 C1- 4 C2+ 5 C2- 6 V- 7 RIN 8 16 FORCEOFF 15 VCC 14 GND 13 DOUT 12 FORCEON 11 DIN 10 INVALID 9 ROUT DESCRIPTION/ORDERING INFORMATION The TRSF3221 consists of one line driver, one line receiver, and a dual charge-pump circuit with ±15-k V IEC ESD protection pin-to-pin (serial-port connection pins, including GND). The TRSF3221 provides the electrical interface between an asynchronous munication 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 TRSF3221 operates at data signaling rates up to 1 Mbit/s and a driver output slew rate 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 TRSF3221 does not sense a valid RS-232 signal on the receiver input, the driver output is disabled. If FORCEOFF is set low and the enable (EN) input 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...