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LT1342 Datasheet(PDF) 5 Page - Linear Technology |
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LT1342 Datasheet(HTML) 5 Page - Linear Technology |
5 / 8 page 5 LT1342 CC HARA TERISTICS A TYPICALPERFOR CE Receiver Output Waveforms Receiver Short-Circuit Current Driver Output Waveforms DRIVER OUTPUT RL = 3k CL = 2500pF INPUT DRIVER OUTPUT RL = 3k PI FU CTIO S VCC: 5V Input Supply Pin. This pin should be decoupled with a 0.1 µF ceramic capacitor close to the package pin. Insufficient supply bypassing can result in low output drive levels and erratic charge pump operation. VL: 3V Logic Supply Pin. Provides power to the receiver outputs. Decouple with a 0.1 µF ceramic capacitor. GND: Ground Pin. ON/OFF: A TTL/CMOS Compatible Operating Mode Con- trol. A logic low puts the device in the low power shutdown mode. Drivers and receivers assume a high impedance state in shutdown. The transceiver consumes almost no supply current while in shutdown. A logic high fully enables the transceiver. An ON/OFF logic low signal super- sedes the state of the DRIVER DISABLE pin. DRIVER DISABLE: This pin provides an alternate control for the charge pump and RS232 drivers. A logic high on this pin shuts down the charge pump and places all drivers in a high impedance state. All five receivers remain active under these conditions. Floating the DRIVER DISABLE pin or driving it to a logic low level fully enables the trans- ceiver. A logic low on the ON/OFF pin supersedes the state of the DRIVER DISABLE pin. Supply current drops to 3mA when in driver disable mode. V+: Positive Supply Output (RS232 Drivers). V+ ≈ 2VCC – 1.5V. This pin requires an external charge storage capaci- tor C ≥ 0.1µF, tied to ground or VCC. With multiple transceivers, the V + and V – pins may be paralleled into common charge storage capacitors. Larger value capaci- tors may be used to reduce supply ripple. LT1342 • TPC13 Driver Short-Circuit Current RX5 OUTPUT CL = 50pF RX1 TO RX4 OUTPUT CL = 50pF INPUT LT1342 • TPC12 VL = 3V TEMPERATURE ( °C) –55 20 25 30 25 75 LT1342 • TPC10 15 10 –25 0 50 100 125 5 0 ISC + ISC – TEMPERATURE ( °C) –55 0 20 50 0 50 75 LT1342 • TPC11 10 40 30 –25 25 100 125 RX1 TO RX4 ISC + RX1 TO RX4 ISC – RX5 ISC – RX5 ISC + |
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