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LT1332CG Datasheet(PDF) 6 Page - Linear Technology |
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LT1332CG Datasheet(HTML) 6 Page - Linear Technology |
6 / 8 page 6 LT1332 PI FU CTIO S capacitors work well in this application. When V– is powered from an external supply, the filter capacitor can be considerably smaller (C ≥ 0.1µF). Ceramic capacitors work well under these conditions. V– should be greater than –13.2V and less than – 6.5V. C–: Commutating Capacitor Input. When the LT1332 is used with a switching regulator, a charge pump capacitor should be connected from the regulator’s switch pin to the C– pin. Make the external capacitor 1 µF or larger with low effective series resistance to maintain good charge pump efficiency. Low ESR tantalum capacitors (ESR < 2 Ω) work well in this application. The C– pin should be left open when V– is powered from an external supply. DRIVER IN: RS232 Driver Input Pins. Inputs are TTL/ CMOS compatible, with threshold set to 1.2V. Unused inputs should not float; tie them to VCC. DRIVER OUT: Driver Outputs at RS232 Voltage Levels. Outputs are in a high impedance state when in SHUT- DOWN mode, or VCC = 0V. Outputs are fully short-circuit protected from V– + 30V to V+ – 30V with the power on, off or SHUTDOWN. Typical breakdowns are ±45V. Applying higher voltages will not damage the device if the overdrive is moderately current limited. Although the outputs are protected, short circuits on one output can load the power supply generator and may disrupt the signal levels of the other outputs. The driver outputs are protected against ESD to ±10kV for human body model discharges. RX IN: Receiver Inputs. These pins accept RS232 level signals ( ±5V to ±30V) into a protected 5k terminating resistor. The receiver inputs are protected against ESD to ±10kV for human body model discharges. Each receiver provides 0.4V of hysteresis for noise immunity. The re- ceiver thresholds are specified at VCC = 3V. When VCC varies from 2V to 6V, the lower threshold increases about 3V. Regardless of these shifts, the device provides accurate data from valid RS232 input signals. A graph in the performance characteristics section shows typical changes in the thresholds. The active receiver (RXA, Pin 10, S Package) remains functional in SHUTDOWN. RX OUT: Receiver Outputs with TTL/CMOS Voltage Lev- els. Outputs are in a high impedance stage when in SHUTDOWN mode to allow data line sharing. Outputs are fully short-circuit protected to ground or VCC with the power on, off or in SHUTDOWN mode. The active receiver (RXA, Pin 15, S Package) remains functional in SHUT- DOWN. ESD PROTECTIO ESD Test Circuit The RS232 line inputs of the LT1332 have on-chip protec- tion from ESD transients up to ±10kV. The protection structures act to divert the static discharge safely to system ground. In order for the ESD protection to function effectively, the power supply and ground pins of the LT1332 must be connected to ground through low imped- ances. The power supply decoupling capacitors and charge pump storage capacitors provide this low impedance in normal applications of the circuit. The only constraint is that low ESR capacitors must be used for bypassing and charge storage. ESD testing must be done with pins VCC, V +, V – and GND shorted to ground or connected with low ESR capacitors. LT1332 • TC LT1332 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 –12V 0.1 µF 0.1 µF 3V RS232 LINE PINS PROTECTED TO ±10kV C– DRIVER OUT RX IN DRIVER OUT RX IN RX IN RX IN DRIVER OUT RXA IN NC V– GND GND DRIVER IN RX OUT DRIVER IN RX OUT RX OUT RX OUT DRIVER IN RXA OUT RS232 ON/OFF V+ 3V VCC 0.1 µF 12V |
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