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LTC1337CG Datasheet(PDF) 5 Page - Linear Technology |
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LTC1337CG Datasheet(HTML) 5 Page - Linear Technology |
5 / 8 page 5 LTC1337 1337fa PI FU CTIO S DRIVER IN: RS232 Driver Input Pins. Inputs are TTL/ CMOS compatible. Inputs should not be allowed to float. Tie unused inputs to VCC. DRIVER OUT: Driver Outputs at RS232 Voltage Levels. Outputs are in a high impedance state when in Shutdown mode 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 Levels. Outputs are in a high impedance state when in Shutdown mode to allow data line sharing. TEST CIRCUITS DRIVER DRIVER INPUT 3k 51pF DRIVER OUTPUT 1337 F03 Figure 3. Driver Timing Test Load ESD Test Circuit 1337 TC01 VCC C1 0.1µF LTC1337 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 ON/OFF 28 27 26 25 24 23 22 21 20 19 18 17 16 15 C3 0.1µF DRIVER 1 IN RX1 OUT DRIVER 2 IN RX2 OUT RX3 OUT RX4 OUT DRIVER 3 IN RX5 OUT V– V+ C2 0.1µF C4 0.1µF GND RS232 LINE PINS PROTECTED TO ±10kV RX RX IN 51pF RX OUTPUT 1337 F04 Figure 4. Receiver Timing Test Load Figure 1. Driver Propagation Delay Timing 0.8V VCC 0V 0V RX IN RX OUTPUT 1.3V tHLR 1.7V tLHR 1337 F02 VCC 0V 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 1337 F01 |
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