描述 Description

The F81435 is programmable, monolithic multi-protocol transceiver device that contains RS-232 and RS-485/RS-422 drivers and receivers. The F81435 can be reconfigured into eight operating modes including three set of 1T/1R RS-422 full duplex, one set of 3T/5R RS-232, three set of 1T/1R RS-485 half duplex, and ccTalk with SINN as open drain output. The RS-485 / RS-422 modes could be in both half and full duplex configurations. Termination and bias resistors can be selected whenever you need by changing the logic state of pin 31 (INT_R_EN) and pin 32 (EXT_R_EN) selection pins.(1)The extra charge pumps deliver true RS-232 driver output voltage from a single power supply at either 3.3V or 5V. I/O power (minimum 1.62V) is for the controller side’s power. The F81435 requires only four 0.1μF capacitors for the charge pump. This item converts the 5 V input power to the ±10 V (nominal) required for RS-232 output levels. The F81435 meets the EIA-232-E V0.28 specification while using a single digital 3.3V or 5 V supply and particularly suites for those applications where ±12V is not available. A slew rate control pin configures driver outputs for either high data rate or slew-controlled data rates. Slew-controlled outputs minimize the problems that caused by the reflections and ringing on long or un-terminated cables.(1)(1)

特性 Features

3.0V ~ 5.5V Single Supply OperationSupport I/O power voltage from 1.62V to 5.5V on logic sideRS-232 Data Rate 3Mbps (Max. Load 100pF)RS-422/RS-485 Data Rate 20Mbps (Max. Load 47pF)RS-422/RS-485 Advance Failsafe for Open, Short or TerminatedAdjustable Slew Rate for Minimize EMI ErrorFlexible 8 Operation Modes Selected by 3 Configuration Pins for F81435i.????? 1T/1R RS-422 full duplex (Multi master). TX enable high active.
ii.???? 3T/5R Pure RS-232.
iii.??? 1T/1R RS-485 half duplex. TX enable high active.
iv.??? ccTalk with SINN as open drain output.
v.???? 1T/1R RS-422 full duplex (Multi master). TX enable low active.
vi.??? 1T/1R RS-485 half duplex. TX enable low active with auto sensing (also mean auto direction control).
vii.?? 1T/1R RS-485 half duplex. TX enable low active
viii.? 1T/1R RS-422 full duplex (Multi master). TX enable low active with auto sensing (also mean auto direction control).
Nominal ±10V Driving Output Swing for +5V input±16.5V Receiver Input Voltage RangePackage in 40 QFN (5mm x 5mm)Robust ESD Protection: ±8kV IEC 61000-4-2 (contact)40 QFN (5mm x 5mm)