LTC1545 LINER [Linear Technology], LTC1545 Datasheet
LTC1545
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LTC1545 Summary of contents
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... X.21 protocols. Cable termination may be implemented using the LTC1344A software-selectable cable termination chip or by using existing discrete designs. The LTC1545 runs from a 5V supply and the charge pump on the LTC1543. The part is available in a 36-lead SSOP surface mount package. , LTC and LT are registered trademarks of Linear Technology Corporation. ...
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... Receiver Output .......................................... Indefinite V .................................................................. 30 sec EE Operating Temperature Range LTC1545C .............................................. LTC1545I ........................................... – Storage Temperature Range ................ – 150 C Lead Temperature (Soldering, 10 sec)................. 300 C ELECTRICAL CHARACTERISTICS The denotes specifications which apply over the full operating temperature range, otherwise specifications are at T ...
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... Input to Output PLH t Input to Output PHL t Input to Output Difference, t – t PLH CONDITIONS D1, D2, D3, D4, D5 M0, M1, M2, DCE, D4ENB, R4EN = GND (LTC1545C) M0, M1, M2, DCE, D4ENB, R4EN = GND (LTC1545I) M0, M1, M2, DCE, D4ENB, R4EN = – 4mA 4mA ...
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... LTC1545 ELECTRICAL CHARACTERISTICS The denotes specifications which apply over the full operating temperature range, otherwise specifications are 5V 8V – 7V for V.28, – 5.5V for V.10, V.11 (Notes SYMBOL PARAMETER V.10 Driver V Output Voltage O V Output Voltage T I Short-Circuit Current SS I Output Leakage Current ...
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... D2 A (Pin 32): Driver 2 Inverting Output (Pin 33): Driver 1 Noninverting Output (Pin 34): Driver 1 Inverting Output. GND (Pin 35): Ground. V (Pin 36): Negative Supply Voltage. Connect LTC1543. Connect capacitor to ground 1545 F01 Figure 2. V.11 Driver/Receiver AC Test Circuit LTC1545 100pF 100 ...
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... LTC1545 TEST CIRCUITS Figure 3. V.10/V.28 Driver Test Circuit W U ODE SELECTIO LTC1545 MODE NAME M2 M1 Not Used (Default V.11 RS530A 0 0 RS530 RS449/V. V.28/RS232 1 1 D4ENB = 1, R4EN = Note 1: Driver 3 and Receiver 1 are enabled (and disabled) by DCE/DTE (Pin 14) ...
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... A complete DCE-to-DTE interface operating in EIA530 mode is shown in Figure 9. The LTC1543 of each port is used to generate the clock and data signals. The LTC1545 is used to generate the control signals along with LL (Local Loop-Back), RL (Remote Loop-Back), TM (Test Mode) and RI (Ring Indicate). The LTC1344A cable termination chip is used only for the clock and data signals because they must support V ...
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... LTC1543/ LTC1545 and the LTC1344A enter the no-cable mode when the cable is removed. In the no-cable mode the LTC1543/LTC1545 supply current drops to less than 200 A and all LTC1543/LTC1545 driver outputs and LTC1344A resistive terminations are forced into a high impedance state. 8 ...
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... CONNECTOR 10k The V.10 receiver configuration in the LTC1545 is shown in Figure 13. In V.10 mode switch S3 inside the LTC1545 is turned off. The noninverting input is disconnected inside the LTC1545 receiver and connected to ground.The cable termination is then the 30k input impedance to ground of the LTC1545 V.10 receiver. V.11 (RS422) Interface A typical V ...
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... LTC1543/LTC1545 which connects a 6k (R8) impedance to ground in parallel with 20k (R5) plus 10k (R6) for a combined impedance shown in Figure 17. The 1545 F13 noninverting input is disconnected inside the LTC1543/ LTC1545 receiver and connected to a TTL level reference voltage for a 1.4V receiver trip point. BALANCED INTERCONNECTING CABLE ...
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... Figure 20. R7 10k ' A 1545 F17 R1 51 51.5 LOAD CABLE ' B RECEIVER TERMINATION ' 125 1545 F18 ' connected to B. The LTC1545 ' ' ) and ground C must be 150 15 . For the A LTC1344A R5 R8 20k 6k R6 10k 124 R7 R4 10k 20k B GND Figure 19. V.35 Receiver Configuration LTC1344A 51 ...
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... U DTE vs DCE Operation The DCE/DTE pin acts as an enable for Driver 3/Receiver 1 in the LTC1543, and Driver 3/Receiver 1 in the LTC1545. The LTC1543/LTC1545 can be configured for either DTE or DCE operation in one of two ways: a dedicated DTE or DCE port with a connector of appropriate gender port ...
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... V EE C11 35 GND D4ENB 16 R4EN NC LTC1545 12 13 LTC1344A 21 LATCH TXD A (103) 14 TXD B 24 SCTE A (113) 11 SCTE B 15 TXC A (114) 12 TXC B 17 RXC A (115) 9 RXC B 3 RXD A (104) ...
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... TXD DCE/DTE C10 1, 2, CTS D1 4 DSR LTC1545 6 R1 DCD 7 R2 DTR 8 RTS DCE/DTE Figure 23. Controller-Selectable DCE Port with DB-25 Connector ...
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... LTC1545 D4ENB 16 R4EN NC LTC1545 C8 100pF LTC1344A 21 LATCH DTE 2 TXD A 14 TXD B 24 SCTE A 11 SCTE B 15 TXC A 12 TXC B 17 RXC A ...
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... Data and Clock Signals Perfect for Terminating the LTC1543 3-Driver/3-Receiver for Data and Clock Signals 3-Driver/3-Receiver for Data and Clock Signals Companion to LTC1544/LTC1545 for Data and Clock Signals 4-Driver/4-Receiver for Control Signals Two RS232 Driver/Receiver Pairs or One RS485 Driver/Receiver Pair 12.67 – 12.93* (0.499 – ...