TRSF3238E Series

3- to 5.5-V multichannel 1Mbps RS-232 line driver/receiver with +/-15-kV IEC-ESD protection

Catalog

3- to 5.5-V multichannel 1Mbps RS-232 line driver/receiver with +/-15-kV IEC-ESD protection

Part	Receiver Hysteresis	Protocol	Supplier Device Package	Duplex	Type	Data Rate	Voltage - Supply [Max]	Voltage - Supply [Min]	Mounting Type	Number of Drivers/Receivers [custom]	Number of Drivers/Receivers [custom]	Package / Case [custom]	Package / Case	Package / Case [custom]	Operating Temperature [Max]	Operating Temperature [Min]
Texas Instruments TRSF3238ECDBR	300 mV	RS232	28-SSOP	Full	Transceiver	1 Mbps	5.5 V	3 V	Surface Mount	5	3	0.209 in	28-SSOP	5.3 mm	70 °C	0 °C
Texas Instruments TRSF3238EIDBR	300 mV	RS232	28-SSOP	Full	Transceiver	1 Mbps	5.5 V	3 V	Surface Mount	5	3	0.209 in	28-SSOP	5.3 mm	85 °C	-40 °C

Catalog

3- to 5.5-V multichannel 1Mbps RS-232 line driver/receiver with +/-15-kV IEC-ESD protection

Key Features

• RS-232 Bus-Pin ESD Protection Exceeds ±15 kV Using Human-Body Model (HBM)Meets or Exceeds the Requirements of TIA/EIA-232-F and ITU v.28 StandardsOperates With 3-V to 5.5-V VCCSupplyOperates up to 1000 kbit/sFive Drivers and Three ReceiversAuto-Powerdown Plus Feature Enables Flexible Power-Down ModeLow Standby Current . . . 1 µA TypicalExternal Capacitors . . . 4 × 0.1 µFAccept 5-V Logic Input With 3.3-V SupplyAlways-Active Noninverting Receiver Output (ROUT1B)ESD Protection for RS-232 Interface Pins±15-kV Human-Body Model (HBM)±8-kV IEC61000-4-2, Contact Discharge±15-kV IEC61000-4-2, Air-Gap DischargeAPPLICATIONSBattery-Powered SystemsPDAsNotebooksSubnotebooksLaptopsPalmtop PCsHand-Held EquipmentModemsPrintersRS-232 Bus-Pin ESD Protection Exceeds ±15 kV Using Human-Body Model (HBM)Meets or Exceeds the Requirements of TIA/EIA-232-F and ITU v.28 StandardsOperates With 3-V to 5.5-V VCCSupplyOperates up to 1000 kbit/sFive Drivers and Three ReceiversAuto-Powerdown Plus Feature Enables Flexible Power-Down ModeLow Standby Current . . . 1 µA TypicalExternal Capacitors . . . 4 × 0.1 µFAccept 5-V Logic Input With 3.3-V SupplyAlways-Active Noninverting Receiver Output (ROUT1B)ESD Protection for RS-232 Interface Pins±15-kV Human-Body Model (HBM)±8-kV IEC61000-4-2, Contact Discharge±15-kV IEC61000-4-2, Air-Gap DischargeAPPLICATIONSBattery-Powered SystemsPDAsNotebooksSubnotebooksLaptopsPalmtop PCsHand-Held EquipmentModemsPrinters

Description

The TRSF3238E consists of five line drivers, three line receivers, and a dual charge-pump circuit with ±15-kV ESD (HBM) protection on the driver output (DOUT) and receiver input (RIN) terminals. The device meets the requirements of TIA/EIA-232-F and provides the electrical interface between notebook and subnotebook computer applications. The charge pump and four small external capacitors allow operation from a single 3-V to 5.5-V supply. In addition, the device includes an always-active noninverting output (ROUT1B), which allows applications using the ring indicator to transmit data while the device is powered down. The TRSF3238E operates at data signaling rates up to 1000 kbit/s. Flexible control options for power management are featured when the serial port and driver inputs are inactive. The auto-powerdown plus feature functions when FORCEON is low andFORCEOFFis high. During this mode of operation, if the device does not sense valid signal transitions on all receiver and driver inputs for approximately 30 s, the built-in charge pump and drivers are powered down, reducing the supply current to 1 µA. By disconnecting the serial port or placing the peripheral drivers off, auto-powerdown plus occurs if there is no activity in the logic levels for the driver inputs. Auto-powerdown plus can be disabled when FORCEON andFORCEOFFare high. With auto-powerdown plus enabled, the device activates automatically when a valid signal is applied to any receiver or driver input.INVALIDis 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.INVALIDis low (invalid data) if all receiver input voltages are between -0.3 V and 0.3 V for more than 30 µs. The TRSF3238E consists of five line drivers, three line receivers, and a dual charge-pump circuit with ±15-kV ESD (HBM) protection on the driver output (DOUT) and receiver input (RIN) terminals. The device meets the requirements of TIA/EIA-232-F and provides the electrical interface between notebook and subnotebook computer applications. The charge pump and four small external capacitors allow operation from a single 3-V to 5.5-V supply. In addition, the device includes an always-active noninverting output (ROUT1B), which allows applications using the ring indicator to transmit data while the device is powered down. The TRSF3238E operates at data signaling rates up to 1000 kbit/s. Flexible control options for power management are featured when the serial port and driver inputs are inactive. The auto-powerdown plus feature functions when FORCEON is low andFORCEOFFis high. During this mode of operation, if the device does not sense valid signal transitions on all receiver and driver inputs for approximately 30 s, the built-in charge pump and drivers are powered down, reducing the supply current to 1 µA. By disconnecting the serial port or placing the peripheral drivers off, auto-powerdown plus occurs if there is no activity in the logic levels for the driver inputs. Auto-powerdown plus can be disabled when FORCEON andFORCEOFFare high. With auto-powerdown plus enabled, the device activates automatically when a valid signal is applied to any receiver or driver input.INVALIDis 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.INVALIDis low (invalid data) if all receiver input voltages are between -0.3 V and 0.3 V for more than 30 µs.