TRSF3243E Series
Multichannel RS-232 compatible line driver/receiver (3T/5R) with 15-kV IEC ESD protection
Manufacturer: Texas Instruments
Catalog
Multichannel RS-232 compatible line driver/receiver (3T/5R) with 15-kV IEC ESD protection
Key Features
• ESD protection for RS-232 bus pins±15-kV Human-body model (HBM)±8-kV IEC61000-4-2, Contact discharge±15-kV IEC61000-4-2, Air-gap dischargeOperates with single 3-V to 5.5-V VCCsupplyAlways-active noninverting receiver output (ROUT2B)Low standby current: 1 µA typicalExternal capacitors: 4 × 0.1 µFAccepts 5-V logic input with 3.3-V supplySerial-mouse driveabilitySupports operation up to 1 Mbit/sAuto-powerdown feature to disable driver outputs when no valid RS-232 signal is sensedAvailable in space-saving RHB (5 mm x 5 mm QFN-32) packageESD protection for RS-232 bus pins±15-kV Human-body model (HBM)±8-kV IEC61000-4-2, Contact discharge±15-kV IEC61000-4-2, Air-gap dischargeOperates with single 3-V to 5.5-V VCCsupplyAlways-active noninverting receiver output (ROUT2B)Low standby current: 1 µA typicalExternal capacitors: 4 × 0.1 µFAccepts 5-V logic input with 3.3-V supplySerial-mouse driveabilitySupports operation up to 1 Mbit/sAuto-powerdown feature to disable driver outputs when no valid RS-232 signal is sensedAvailable in space-saving RHB (5 mm x 5 mm QFN-32) package
Description
AI
The TRSF3243E consists of three line drivers, five line receivers, and a dual charge-pump circuit with ±15-kV ESD (HBM and IEC61000-4-2, Air-Gap Discharge) and ±8-kV ESD (IEC61000-4-2, Contact Discharge) protection on serial-port connection pins. This device 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. In addition, this device includes an always-active noninverting output (ROUT2B), which allows applications using the ring indicator to transmit data while the device is powered down. The device operates at data signaling rates up to 1 Mbit/s and an increased slew-rate range of 18 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 andFORCEOFFis high. During this mode of operation, if the device does not sense a valid RS-232 signal, the driver outputs are disabled. IfFORCEOFFis set low, both drivers and receivers (except ROUT2B) 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.
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The TRSF3243E consists of three line drivers, five line receivers, and a dual charge-pump circuit with ±15-kV ESD (HBM and IEC61000-4-2, Air-Gap Discharge) and ±8-kV ESD (IEC61000-4-2, Contact Discharge) protection on serial-port connection pins. This device 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. In addition, this device includes an always-active noninverting output (ROUT2B), which allows applications using the ring indicator to transmit data while the device is powered down. The device operates at data signaling rates up to 1 Mbit/s and an increased slew-rate range of 18 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 andFORCEOFFis high. During this mode of operation, if the device does not sense a valid RS-232 signal, the driver outputs are disabled. IfFORCEOFFis set low, both drivers and receivers (except ROUT2B) 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.
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