MAX3238CDBG4

  
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      SLLS349J − JUNE 1999 − REVISED MARCH 2004 D RS-232 Bus-Pin ESD Protection Exceeds D D D D D D D D D D DB OR PW PACKAGE (TOP VIEW) ±15 kV Using Human-Body Model (HBM) Meets or Exceeds the Requirements of TIA/EIA-232-F and ITU v.28 Standards Operates With 3-V to 5.5-V VCC Supply Operates Up To 250 kbit/s Five Drivers and Three Receivers Low Standby Current . . . 1 µA Typical External Capacitors . . . 4 × 0.1 µF Accepts 5-V Logic Input With 3.3-V Supply Always-Active Noninverting Receiver Output (ROUT1B) Alternative High-Speed Pin-Compatible Device (1 Mbit/s) − SNx5C3238 Applications − Battery-Powered Systems, PDAs, Notebooks, Subnotebooks, Laptops, Palmtop PCs, Hand-Held Equipment, Modems, and Printers C2 + GND C2− V− DOUT1 DOUT2 DOUT3 RIN1 RIN2 DOUT4 RIN3 DOUT5 FORCEON FORCEOFF 1 28 2 27 3 26 4 25 5 24 6 23 7 22 8 21 9 20 10 19 11 18 12 17 13 16 14 15 C1+ V+ VCC C1− DIN1 DIN2 DIN3 ROUT1 ROUT2 DIN4 ROUT3 DIN5 ROUT1B INVALID description/ordering information The MAX3238 consists of five line drivers, three line receivers, and a dual charge-pump circuit with ±15-kV ESD (HBM) protection pin to pin (serial-port connection pins, including GND). The device meets the requirements of TIA/EIA-232-F and provides the electrical interface between notebook and subnotebook computer applications. 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 (ROUT1B), which allows applications using the ring indicator to transmit data while the device is powered down. These devices operate at data signaling rates up to 250 kbit/s and a maximum of 30-V/µs driver output slew rate. ORDERING INFORMATION ORDERABLE PART NUMBER PACKAGE† TA SSOP (DB) −0°C to 70°C TSSOP (PW) SSOP (DB) −40°C to 85°C TSSOP (PW) Tube of 50 MAX3238CDB Reel of 2000 MAX3238CDBR Tube of 50 MAX3238CPW Reel of 2000 MAX3238CPWR Tube of 50 MAX3238IDB Reel of 2000 MAX3238IDBR Tube of 50 MAX3238IPW Reel of 2000 MAX3238IPWR TOP-SIDE MARKING MAX3238C MA3238C MAX3238I MB3238I † Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. Copyright  2004, Texas Instruments Incorporated        !"#$%&'(!$" !) *+%%,"( ') $# -+./!*'(!$" 0'(, %$0+*() *$"#$%& ($ )-,*!#!*'(!$") -,% (1, (,%&) $# ,2') ")(%+&,"() )('"0'%0 3'%%'"(4 %$0+*(!$" -%$*,))!"5 0$,) "$( ",*,))'%!/4 !"*/+0, (,)(!"5 $# '// -'%'&,(,%) POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 1 
  
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      SLLS349J − JUNE 1999 − REVISED MARCH 2004 description/ordering information (continued) Flexible control options for power management are featured when the serial port and driver inputs are inactive. The auto-powerdown plus feature functions when FORCEON is low and FORCEOFF is high. During this mode of operation, if the device does not sense valid signal transitions on all receiver and driver inputs for approximately 30 s, the built-in charge pump and drivers are powered down, reducing the supply current to 1 µA. By disconnecting the serial port or placing the peripheral drivers off, auto-powerdown plus occurs if there is no activity in the logic levels for the driver inputs. Auto-powerdown plus can be disabled when FORCEON and FORCEOFF are high. With auto-powerdown plus enabled, the device activates automatically when a valid signal is applied to any receiver or driver 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. Function Tables EACH DRIVER INPUTS OUTPUT DOUT DRIVER STATUS X Z Powered off Normal operation with auto-powerdown plus disabled DIN FORCEON FORCEOFF TIME ELAPSED SINCE LAST RIN OR DIN TRANSITION X X L L H H X H H H H X L L L H 30 s Z Normal operation with auto-powerdown plus enabled Powered off by auto-powerdown plus feature H = high level, L = low level, X = irrelevant, Z = high impedance EACH RECEIVER INPUTS RIN1 RIN2−RIN3 FORCEOFF OUTPUTS TIME ELAPSED SINCE LAST RIN OR DIN TRANSITION ROUT1B ROUT L X L X L Z H X L X H Z L L H