ST3243B, ST3243C 15 kV ESD protected 3 to 5.5 V, 400 kbps, RS-232 transceiver with auto-power-down Datasheet - production data All transmitter outputs and receiver inputs are protected to 8 kV using IEC61000-4-2 contact discharge and 15 kV IEC61000-4-2 air discharge. The receiver R2 is always active to implement a wake-up feature for the serial port. SSOP-28 The ST3243B/ST3243C devices have a proprietary low-dropout transmitter output stage enabling true RS-232 performance from a 3.0 V to 5.5 V supply with a dual charge pump. The Features devices are guaranteed to run at data rates of ESD protection for RS-232 I/O pins 250 kbps while maintaining RS-232 output levels. 8 kV IEC61000-4-2 contact discharge The auto-power-down feature functions when 15 kV IEC61000-4-2 air discharge FORCEON is low and FORCEOFF is high. During this mode of operation, if the device does not 1 A supply current achieved when in auto- sense a valid RS-232 signal, the driver outputs power-down are disabled. If FORCEOFF is set low, both 250 kbps minimum guaranteed data rate drivers and receivers (expert R2B) are shut off, Guaranteed 6 V/s slew rate range and supply current is reduced to 1 A. Disconnecting the serial port or turning off the Guaranteed mouse drive ability peripheral drives causes the auto-power-down 0.1 F external capacitors condition to occur. Meet EIA/TIA-232 specifications down to 3 V Auto-power-down can be disabled when Available in SSOP-28 package FORCEON and FORCEOFF are high, and should be done when driving a serial mouse. With auto- power-down enabled, the device is activated Description automatically when a valid signal is applied to any The ST3243B/ST3243C devices consist of 3 receiver input. drivers, 5 receivers and a dual charge pump Typical application are in notebook, subnotebook, circuit. The devices meet the requirements of palmtop computers, battery-powered equipment, EIA/TIA and V.28/V.24 communication standards hand-held equipment, peripherals, and printers. providing high data rate capability and enhanced electrostatic discharge (ESD) protection. Table 1. Device summary Order code Temperature range Package Packaging ST3243CPR 0 to 70 C SSOP-28 (tape and reel) 1350 parts per reel Note: For new designs, we recommend the use of the ST3243EB and ST3243EC which have a temperature range of -40 to 85 C and 0 to 70 C respectively. October 2014 DocID7539 Rev 12 1/18 This is information on a product in full production. www.st.comContents ST3243B, ST3243C Contents 1 Pin configuration 3 2 Maximum ratings . 6 3 Electrical characteristics . 7 4 Application 10 5 Typical performance characteristics . 12 6 Package mechanical data 14 7 Revision history . 17 2/18 DocID7539 Rev 12