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LTC1382CSW Datasheet(PDF) 5 Page - Linear Technology |
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LTC1382CSW Datasheet(HTML) 5 Page - Linear Technology |
5 / 8 page 5 LTC1382 1382fa VCC: 5V Input Supply Pin. This pin should be decoupled with a 0.1µF ceramic capacitor. GND: Ground Pin. ON/OFF: TTL/CMOS Compatible Shutdown Pin. A logic low puts the device in the Shutdown mode. Both driver outputs are forced into three-state and the supply current is 0.2µA. V+: Positive Supply Output (RS232 Drivers). V+ ≅ 2VCC – 2V. This pin requires an external capacitor C = 0.1µF for charge storage. The capacitor may be tied to ground or VCC. With multiple devices, the V + and V – pins may share a common capacitor. For large numbers of devices, in- creasing the size of the shared common storage capaci- tors is recommended to reduce ripple. V–: Negative Supply Output (RS232 Drivers). V – ≅ – (2VCC – 2V). This pin requires an external capacitor C = 0.1µF for charge storage. C1+, C1–, C2+, C2–: Commutating Capacitor Inputs. These pins require two external capacitors C = 0.1µF: one from C1+ to C1– and another from C2+ to C2 –. To maintain charge pump efficiency, the capacitor’s effective series resistance should be less than 2Ω. TR IN: RS232 Driver Input Pins. Inputs are TTL/CMOS compatible. The inputs of unused drivers can be left unconnected since 300k input pull-up resistors to VCC are included on chip. To minimize power consumption, the internal driver pull-up resistors are disconnected from VCC in the Shutdown mode. TR OUT: Driver Outputs at RS232 Voltage Levels. Outputs are in a high impedance state when in the Shutdown or VCC = 0V. The driver outputs are protected against ESD to ±10kV for human body model discharges. RX IN: Receiver Inputs. These pins can be forced to ±25V without damage. The receiver inputs are protected against ESD to ±10kV for human body model discharges. Each receiver provides 0.4V of hysteresis for noise immunity. RX OUT: Receiver Outputs with TTL/CMOS Voltage Lev- els. Outputs are in a high impedance state when in the Shutdown mode. Figure 1. Driver Propagation Delay Timing Figure 2. Receiver Propagation Delay Timing SWITCHI G TI E WAVEFOR S 1.4V 0V VCC 0V V+ V– 0V DRIVER INPUT DRIVER OUTPUT 1.4V tHLD tLHD LTC1382 • F01 0.8V VCC 0V 2.4V RX INPUT RX OUTPUT 1.3V tHLR 1.7V tLHR LTC1382 • F02 VCC 0V PI FU CTIO S |
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