SP3244E-SP3245E 3.3V or 5V RS-232 Transceivers with Auto On-Line Plus FEATURES Contains 3-Drivers and 5-Receivers Single-chip DTE (PC or terminal) serial port transceiver Auto On-Line Plus C2+ 28C1+ 1 SP3244E slew-controlled to 250kbps under load SP3245E 1Mbps data rate for high-speed RS-232 C2- 2 27V+ Meets true EIA/TIA-232-F and ITU V.28 standards from a +3.0V to +5.5V power supply V- 26VCC 3 Adheres to EIA/TIA-562 for interoperability R1IN GND 25 with EIA/TIA-232 down to a +2.7V supply voltage 4 Regulated charge pump yields stable RS-232 24 R2IN 5 C1- outputs regardless of VCC variations ESD Specifications: SP3244E 6 23ONLINE R3IN 15KV Human Body Model SP3245E SHUTDOWN 22 R4IN 7 STATUS R5IN 21 8 20R2OUT T1OUT 9 APPLICATIONS R1OUT T2OUT 10 19 Portable RS-232 Laptops and handheld PCs and PDA 18R2OUT T3OUT11 Cellular telephones, datacables, charging- cradles T3IN 17R3OUT 12 Diagnostic/upload ports on embedded applica- 16 T2IN13 R4OUT tions Use in conjunction with low-voltage UART or T1IN 15R5OUT 14 microcontroller SP3244 is cross-compatible with MAX3244, ICL3244 SP3245 is cross-compatible with MAX3245, ICL3245 DESCRIPTION The SP3244E/3245E is a 3-driver/5-receiver device ideal for mobile phone, consumer and PDA applications. These devices use an internal high-efficiency, charge-pump power supply that requires only 0.1F capacitors for 3.3V single-supply operation. This charge pump and Exars driver archi- tecture allow the SP3244E/3245E to deliver compliant RS-232 performance from a power supply ranging from +3.0V to +5.5V. At voltages between +2.7V and +3.0V the driver outputs are compliant with RS-562 and can interface to RS-232 in portable applications. The Auto On-Line Plus feature allows the device to automatically enter a low power shutdown mode if all receiver and driver inputs have been idle for 30 seconds. The device will wake-up from this automatic shutdown state upon detecting activity. This power saving feature functions without system intervention or modifications to software or drivers. SP3244E supports serial data rates of 250kbps minimum under full load and while maintaining slew rates of less than 30V/s. SP3245E is capable of high speed communication of up to 1Mbps. Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-70 7 www .exar.com SP3244E SP3245E 00 2 509 PIN ASSIgNENTSm PIN NUMBER NAME FUNCTION (T)SSOP QFN C2+ Positive terminal of the inverting charge pump capacitor. 29 C2- Negative terminal of the inverting charge pump capacitor. 2 30 V- Regulated -5.5V output generated by the charge pump. 3 3 RIN RS-232 receiver input. 4 R2IN RS-232 receiver input. 5 2 R3IN RS-232 receiver input. 6 3 R4IN RS-232 receiver input. 7 4 R5IN RS-232 receiver input. 8 5 T OUT RS-232 driver output. 9 6 T2OUT RS-232 driver output. 0 7 T3OUT RS-232 driver output. 8 T3IN TTL/CMOS driver input. 2 0 T2IN TTL/CMOS driver input. 3 T IN TTL/CMOS driver input. 4 2 R5OUT TTL/CMOS receiver output. 5 3 R4OUT TTL/CMOS receiver output. 6 4 R3OUT TTL/CMOS receiver output. 7 5 R2OUT TTL/CMOS receiver output. 8 7 ROUT TTL/CMOS receiver output. 9 8 R2OUT Non-inverting receiver 2 output active in shutdown. 20 9 STATUS Status output. 2 20 Forced SHUTDOWN input. Drive low to shut down drivers, receivers SHUTDOWN and charge pump. Will override Auto On-Line Plus. Do not leave 22 2 this pin open. Auto On-line Plus input. Active low enabled automatic power saving ONLINE feature. Equivalent to competitor s FORCEON pin. Do not leave this 23 22 pin open. C - Negative terminal of the voltage doubler charge pump capacitor. 24 23 GND Ground connection. 25 24 VCC Device power supply pin (3.0V to 5.5V). 26 26 V+ Regulated +5.5V output generated by the charge pump. 27 27 C+ Positive terminal of the voltage doubler charge pump capacitor. 28 28 NC No connection. - 9, 6, 25, 32 Exar Corporation 48720 Kato Road, Fremont CA, 94538 50-668-70 7 www .exar.com SP3244E SP3245E 00 2 509 2