SN75C3243DW Integrated Circuit Chip linear digital integrated circuits

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SN65C3243, SN75C3243

3V TO 5.5V MULTICHANNEL COMPATIBLE RS232 LINE DRIVERS/RECEIVERS

• Operate With 3-V to 5.5-V VCC Supply
• Always-Active Noninverting Receiver Output (ROUT2B)
• Low Standby Current . . . 1 µA Typical
• External Capacitors . . . 4 × 0.1 µF
• Accept 5-V Logic Input With 3.3-V Supply

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• Inter-Operable With SN65C3238, SN75C3238
• Support 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
• Applications
  • − Battery-Powered Systems, PDAs, Notebooks, Laptops, Palmtop PCs, and Hand-Held Equipment

description

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). These devices provide 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, these devices include an always-active noninverting output (ROUT2B), which allows applications using the ring indicator to transmit data while the devices are powered down. The devices operate 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 devices do 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.

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†

Supply voltage range, V_CC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.3 V to 6 V

Positive output supply voltage range, V+ (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . −0.3 V to 7 V

Negative output supply voltage range, V− (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to −7 V

Supply voltage difference, V+ − V− (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 V

Input voltage range, V_I : Driver (FORCEOFF, FORCEON) . . . . . . . . . . . . . . . . . . . . . −0.3 V to 6 V

Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −25 V to 25 V

Output voltage range, V_O: Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −13.2 V to 13.2 V

Package thermal impedance, θ_JA (see Notes 2 and 3): DB package . . . . . . . . . . . . . . . . . . 62°C/W

DW package . . . . . . . . . . . . . . . . . . 46°C/W

PW package . . . . . . . . . . . . . . . . . . 62°C/W

Operating virtual junction temperature, T_J . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150°C

Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65°C to 150°C

† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTES:

1. All voltages are with respect to network GND.

2. Maximum power dissipation is a function of TJ(max), θJA, and TA. The maximum allowable power dissipation at any allowable ambient temperature is PD = (TJ(max) − TA)/θJA. Operating at the absolute maximum TJ of 150°C can affect reliability.

3. The package thermal impedance is calculated in accordance with JESD 51-7.

DB, DW, OR PW PACKAGE (TOP VIEW)

logic diagram (positive logic)

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