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LTC1349I Datasheet(PDF) 4 Page - Linear Technology |
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LTC1349I Datasheet(HTML) 4 Page - Linear Technology |
4 / 8 page 4 LTC1349 VCC: 5V Input Supply Pin. Supply current is typically 35µA in the SHUTDOWN mode. This pin should be decoupled with a 0.1 µF ceramic capacitor. GND: Ground Pin. ON/OFF: TTL/CMOS Compatible SHUTDOWN Pin. A logic low puts the device in SHUTDOWN mode, with receivers 4 and 5 kept alive and the supply current equal to 35 µA. All driver outputs and other receiver outputs are in high impedance state. This pin can not float. V+: Positive Supply Output (RS232 Drivers). V+ ≅ 2VCC – 1V. This pin requires an external capacitor C = 0.1 µF for charge storage. The capacitor may be tied to ground or 5V. TYPICAL PERFOR A CE CHARACTERISTICS VCC Supply Current Driver Short-Circuit Current Driver Leakage in SHUTDOWN TEMPERATURE (°C) 0 60 20 16 14 12 10 8 6 4 2 0 LTC1349 • TPC04 20 70 10 30 40 50 3 DRIVERS LOADED RL = 3k 1 DRIVER LOADED RL = 3k TEMPERATURE (°C) 0 60 45 40 35 30 25 20 15 10 5 0 LTC1349 • TPC05 20 70 10 30 40 50 VOUT = –20V VOUT = 20V TEMPERATURE (°C) –40 0 4 8 10 12 40 20 LTC1349 • TPC06 6 080 14 16 18 –20 60 20 100 ISC + ISC – Receiver Short-Circuit Current Receiver Output Waveforms Driver Output Waveforms TEMPERATURE (°C) –40 10 30 60 0 40 60 LTC1349 • TPC07 20 50 40 –20 20 80 100 ISC – ISC + DRIVER OUTPUT RL = 3k DRIVER OUTPUT RL = 3k CL = 2500pF INPUT RECEIVER OUTPUT CL = 2500pF INPUT LTC1349 • TPC08 LTC1349 • TPC09 PI FU CTIO S With multiple devices, the V + and V – pins may be paral- leled into common capacitors. For large numbers of de- vices, increasing the size of the shared common storage capacitors is recommended to reduce ripple. V–: Negative Supply Output (RS232 Drivers). V – ≅ 2VCC – 1.5V. This pin requires an external capacitor C = 0.1 µF for charge storage. C1+, C1–, C2+, C2–: Commutating Capacitor Inputs. These pins require two external capacitors C = 0.1 µF: 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 20 Ω. |
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