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SN75C3243 Datasheet(PDF) 1 Page - Texas Instruments |
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SN75C3243 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 21 page 1 FEATURES APPLICATIONS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 C2+ C2− V− RIN1 RIN2 RIN3 RIN4 RIN5 DOUT1 DOUT2 DOUT3 DIN3 DIN2 DIN1 C1+ V+ VCC GND C1− FORCEON FORCEOFF INVALID ROUT2B ROUT1 ROUT2 ROUT3 ROUT4 ROUT5 DB, DW, OR PW PACKAGE (TOP VIEW) DESCRIPTION/ORDERING INFORMATION SN65C3243 , SN75C3243 www.ti.com ................................................................................................................................................. SLLS353H – JUNE 1999 – REVISED SEPTEMBER 2008 3-V TO 5.5-V MULTICHANNEL RS-232 COMPATIBLE LINE DRIVER/RECEIVER • Operates With 3-V to 5.5-V V CC Supply • Always-Active Noninverting Receiver Output (ROUT2B) • Low Standby Current . . . 1 µA Typ • External Capacitors . . . 4 × 0.1 µF • Accepts 5-V Logic Input With 3.3-V Supply • Inter-Operable With SN65C3238, SN75C3238 • Supports Operation From 250 kbit/s to 1 Mbit/s • RS-232 Bus-Pin ESD Protection Exceeds ±15 kV Using Human-Body Model (HBM) • Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II • Battery-Powered Systems • PDAs • Notebooks • Laptops • Palmtop PCs • Hand-Held Equipment The SN65C3243 and SN75C3243 consist of three line drivers, five line receivers, and a dual charge-pump circuit with ±15-kV ESD protection pin to pin (serial-port connection pins, including GND). This device provides the electrical interface between an asynchronous communication controller and the serial-port connector. The charge pump and four small external capacitors allow operation from a single 3-V to 5.5-V supply. In addition, this 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 1 Mbit/s and an increased slew-rate range of 24 V/ µs to 150 V/µs. 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. 1 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. PRODUCTION DATA information is current as of publication date. Copyright © 1999–2008, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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