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MAX3243ECDWG4 Datasheet(PDF) 2 Page - Texas Instruments |
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MAX3243ECDWG4 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 26 page DESCRIPTION MAX3243E SLLS657C – APRIL 2005 – REVISED FEBRUARY 2009................................................................................................................................................... www.ti.com The MAX3243E device 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. The device meets the requirements of TIA/EIA-232-F and provides the electrical interface between an asynchronous communication controller and the serial-port connector. This combination of drivers and receivers matches that needed for the typical serial port used in an IBM PC/AT, or compatible. 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 (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 250 kbit/s and a maximum of 30-V/ µs driver output slew rate. Flexible control options for power management are available when the serial port is inactive. The auto-powerdown feature functions when FORCEON is low and FORCEOFF is high. During this mode of operation, if the device does not sense a valid RS-232 signal, the driver outputs are disabled. If FORCEOFF is 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. Auto-powerdown can be disabled when FORCEON and FORCEOFF are high, and should be done when driving a serial mouse. With auto-powerdown enabled, the device is activated automatically when a valid signal is applied to any receiver input. The INVALID output is used to notify the user if an RS-232 signal is present at any receiver input. INVALID is 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. INVALID is low (invalid data) if all receiver input voltages are between –0.3 V and 0.3 V for more than 30 µs. Refer to Figure 5 for receiver input levels. The MAX3243EC is characterized for operation from 0°C to 70°C. The MAX3243EI is characterized for operation from –40°C to 85°C. ORDERING INFORMATION TA PACKAGE(1)(2) ORDERABLE PART NUMBER TOP-SIDE MARKING MAX3243ECDW SOIC – DW Tape and reel MAX3243EC MAX3243ECDWR MAX3243ECDB SSOP – DB Tape and reel MAX3243EC 0°C to 70°C MAX3243ECDBR MAX3243ECPW TSSOP – PW Tape and reel MP243EC MAX3243ECPWR QFN – RHB Tape and reel MAX3243ECRHBR MP243E MAX3243EIDB SSOP – DB Tape and reel MAX3243EI MAX3243EIDBR MAX3243EIDW SOIC – DW Tape and reel MAX3243EI –40°C to 85°C MAX3243EIDWR MAX3243EIPW TSSOP – PW Tape and reel MP243EI MAX3243EIPWR QFN – RHB Tape and reel MAX3243EIRHBR MR243E (1) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging. (2) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI website at www.ti.com. 2 Submit Documentation Feedback Copyright © 2005–2009, Texas Instruments Incorporated Product Folder Link(s): MAX3243E |
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