LTC1687 LINER [Linear Technology], LTC1687 Datasheet
LTC1687
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LTC1687 Summary of contents
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... Receiver input resistance remains 22k when the device is unpowered or disabled. The LTC1686/LTC1687 operate from a single 5V supply and draw only 7mA of supply current. , LTC and LT are registered trademarks of Linear Technology Corporation. ...
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... 5.25V – 12V – 4mA 300mV OUT ID ) ........................................ Indefinite DD TOP VIEW ORDER PART 14 V NUMBER LTC1687CS PACKAGE = 125 MIN TYP MAX V DD 2 0.2 2 0.8 – 1 ...
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... S2 Closed, Figures 15pF, S1 Closed, Figures 15pF, S2 Closed, Figures (Note 15pF, Same Temperature (Note (Note (Note (Note 4) DD LTC1686/LTC1687 MIN TYP MAX 0.4 – – 200 200 500 3.2 3.3 3.4 ...
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... LTC1686/LTC1687 ELECTRICAL CHARACTERISTICS The denotes specifications which apply over the full operating temperature range. Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: All currents into the device pins are positive; all currents out of the device pins are negative ...
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... NC (Pins 1, 8, 13): No Connection. R (Pin 2): Receiver Output 300mV, then R will be high 300mV, then R will be low. RE (Pin 3): Receiver Enable low enables the receiver high forces receiver output into high impedance state. Do not float. LTC1686/LTC1687 Driver Propagation Delay vs Temperature ...
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... DE = low will force the driver output into a high impedance state. Do not float. D (Pin 5): Driver Input. Controls the states of the Y and Z outputs when DE = high. Do not float. GND (Pins 6, 7): Ground. Y (Pin 9): Noninverting Driver Output CTIO TABLES (LTC1687) Transmitting INPUTS LINE CONDITION X ...
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... PHL 0V INPUT Figure 7. Receiver Propagation Delays 1. 1MHz, t 3ns, t 3ns 2.5V OUTPUT NORMALLY LOW OUTPUT NORMALLY HIGH 2. Figure 8. Receiver Enable and Disable Times LTC1686/LTC1687 1.5V 1 PHL t SKEW 90% 10% 1686/87 F05 0.5V 0. 1686/87 F06 2.5V t PLH 1686/87 F07 1 ...
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... FAIL-SAFE FEATURES The LTC1686/LTC1687 have a fail-safe feature that guar- antees the receiver output logic HIGH state when the inputs are either shorted or left open (note that when inputs are left open, large external leakage currents might override the fail-safe circuitry) ...
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... Cable Termination The recommended cable termination for the LTC1686/ LTC1687 is a single resistor across the two wires at each end of the twisted-pair line (see Figure 10). The LTC1687 can also be used with cable terminations with a DC bias (such as Fast-20 and Fast-40 differential SCSI termina- tors) ...
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... Figure 14b. 4000 Feet of Category 5 UTP 1Mbps Square Wave 1.6Mbps Over 8000 Feet (1.5 Miles) Category 5 UTP Using Repeaters The LTC1686/LTC1687 can be used as repeaters to extend the effective length of a high speed twisted-pair line. Figure 15a shows a three repeater configuration using 2000 feet segments of category 5 UTP ...
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... Figure 16 show the signal at the end of each of the first three 2000 feet sections of category 5 UTP. Notice how the LTC1687 repeaters are able to regenerate the signal with little loss. This implies that we can cascade more repeater networks and potentially achieve 1Mbps ...
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... LTC1686/LTC1687 U U APPLICATIONS INFORMATION Long traces bounded and/or GND planes can add DD substantial parasitic capacitance. Parasitic capacitances on the receiver/driver outputs can also unduly slow down both the propagation delay and the rise/fall times. PACKAGE DESCRIPTION 0.010 – 0.020 45 (0.254 – 0.508) 0.008 – ...