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LTC1384 Datasheet(PDF) 5 Page - Linear Technology |
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LTC1384 Datasheet(HTML) 5 Page - Linear Technology |
5 / 8 page 5 LTC1384 1384fa 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 independent of the RX EN pin. The supply current of the device drops to 35µA (two receivers alive) and both driver outputs are forced into three-state. RX EN: TTL/CMOS Compatible Receiver Enable Pin. A logic high forces the receiver outputs into three-state. A logic low enables the receiver outputs. 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. Figure 1. Driver Propagation Delay Timing Figure 2. Receiver Propagation Delay Timing 1.4V 0V VCC 0V V+ V– 0V DRIVER INPUT DRIVER OUTPUT 1.4V tHLD tLHD LTC1384 • F01 0.8V VCC 0V 2.4V RX INPUT RX OUTPUT 1.3V tHLR 1.7V tLHR LTC1384 • F02 VCC 0V SWITCHI G TI E WAVEFOR S 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. A logic high at RX EN puts the outputs into three-state. PI FU CTIO S |
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