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LT1330CJW Datasheet(PDF) 6 Page - Linear Technology |
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LT1330CJW Datasheet(HTML) 6 Page - Linear Technology |
6 / 8 page 6 LT1330 PI FU CTIO S to reduce supply ripple. The ratio of the capacitors on V+ and V – should be greater than 5 to 1. V–: Negative Supply Output. V – ≈ –(2VCC–2.5V).Thispin requires an external charge storage capacitor, C ≥ 0.1µF. See the Applications Information section for guidance in choosing filter capacitors for V+ and V –. C1+, C1–, C2+, C2–: Commutating Capacitor Inputs re- quire two external capacitors, C ≥ 0.2µF: one from C1+ to C1–, and another from C2+ to C2–. The capacitor’s effec- tive series resistance should be less than 2 Ω. For C ≥ 1µF, low ESR tantalum capacitors work well, although ceramic capacitors may be used with a minimal reduction in charge pump compliance. DRIVER IN: RS232 Driver Input Pins. These inputs are TTL/CMOS compatible. Unused inputs should be con- nected to VCC. DRIVER OUT: Driver Outputs at RS232 Voltage Levels. Driver output swing meets RS232 levels for loads up to 3k. Slew rates are controlled for lightly loaded lines. Output current capability is sufficient for load conditions up to 2500pF. Outputs are in a high impedance state when in shutdown mode, VCC = 0V, or when the DRIVER DISABLE pin is active. Outputs are fully short-circuit protected from V – + 30V to V+ – 30V. Applying higher voltages will not damage the device if the overdrive is moderately current limited. 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 ( ±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. Open receiver inputs assume a logic low state. RX OUT: Receiver Outputs with TTL/CMOS Voltage Lev- els. Outputs are in a high impedance state when in shut- down mode to allow data line sharing. Outputs, including LOW-Q RX OUT, are fully short-circuit protected to ground or VCC with the power on, off, or in shutdown mode. LOW Q-CURRENT RX IN: Low Power Receiver Input. This special receiver remains active when the part is in shut- down mode, consuming typically 60 µA. This receiver has the same 5k input impedance and ±10kV ESD protection characteristics as the other receivers. LOW Q-CURRENT RX OUT: Low Power Receiver Output. This pin produces the same TTL/CMOS output voltage levels as receivers RX1, RX2, RX3, and RX4 with slightly decreased speed and short-circuit current. Data rates to 120kbaud are supported by this receiver. The RS232 line inputs of the LT1330 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 LT1330 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 application 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, VL, V+, V –, and GND shorted to ground or connected with low ESR capacitors. ESD PROTECTIO 1330 TC01 5V VCC 1 µF 0.2 µF 0.1 µF RS232 LINE PINS PROTECTED TO ±10kV LT1330 1 2 3 4 5 6 7 8 9 10 11 12 13 14 DRIVER 1 OUT RX1 IN DRIVER 2 OUT RX2 IN RX3 IN RX4 IN DRIVER 3 OUT RX5 IN (LOW-Q) ON/OFF 3V VL 28 27 26 25 24 23 22 21 20 19 18 17 16 15 0.2 µF DRIVER 1 IN RX1 OUT DRIVER 2 IN RX2 OUT RX3 OUT RX4 OUT DRIVER 3 IN RX5 OUT (LOW-Q) V– V+ 0.1 µF GND DRIVER DISABLE 0.1 µF ESD Test Circuit |
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