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LTC1520 Dataheets PDF



Part Number LTC1520
Manufacturers Linear Technology
Logo Linear Technology
Description 50Mbps Precision Quad Line Receiver
Datasheet LTC1520 DatasheetLTC1520 Datasheet (PDF)

Final Electrical Specifications LTC1520 50Mbps Precision Quad Line Receiver FEATURES s s s s s s s s s s s s DESCRIPTION May 1996 U APPLICATIONS s s s s s s Precision Propagation Delay: 18ns ± 3ns Over Temperature Data Rate: 50Mbps Low tPLH/tPHL Skew: 500ps Typ Low Channel-to-Channel Skew: 400ps Typ Rail-to-Rail Input Common Mode Range High Input Resistance: ≥ 18k, Even When Unpowered Hot Swap Capable Can Withstand Input DC Levels of ± 10V Short-Circuit Protected Single 5V Supply LVDS Comp.

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Final Electrical Specifications LTC1520 50Mbps Precision Quad Line Receiver FEATURES s s s s s s s s s s s s DESCRIPTION May 1996 U APPLICATIONS s s s s s s Precision Propagation Delay: 18ns ± 3ns Over Temperature Data Rate: 50Mbps Low tPLH/tPHL Skew: 500ps Typ Low Channel-to-Channel Skew: 400ps Typ Rail-to-Rail Input Common Mode Range High Input Resistance: ≥ 18k, Even When Unpowered Hot Swap Capable Can Withstand Input DC Levels of ± 10V Short-Circuit Protected Single 5V Supply LVDS Compatible Will Not Oscillate with Slow Input Signals The LTC®1520 is a high speed, precision differential line receiver that can operate at data rates as high as 50Mbps. A unique architecture provides very stable propagation delays and low skew over a wide input common mode, input overdrive and ambient temperature range. Propagation delay is 18ns ± 3ns, while typically tPLH/tPHL skew is 500ps and channel-to-channel skew is 400ps. Each receiver translates differential input levels (VID ≥ 100mV) into valid CMOS and TTL output levels. Its high input resistance (≥ 18k) allows many receivers to be connected to the same driver. The receiver outputs go into a high impedance state when disabled. Protection features include thermal shutdown and a controlled maximum short-circuit current (50mA max) that does not oscillate in and out of short-circuit mode. Input resistance remains ≥ 18k when the device is unpowered or disabled, thus allowing the LTC1520 to be hot swapped into a backplane without loading the data lines. The LTC1520 operates from a single 5V supply and draws 12mA of supply current. The part is available in a 16-lead narrow SO package. High Speed Backplane Interface Line Collision Detector PECL and LVDS Line Receivers Level Translator Ring Oscillator Tapped Delay Line , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATION High Speed Backplane Receiver LTC1520 Propagation Delay Guaranteed to Fall Within Shaded Area (± 3ns) + + – – RECEIVER INPUT VID = 500mV RECEIVER OUTPUT VDD = 5V VIN = 1V/DIV VOUT = 5V/DIV + – + – 5V 3.3k 0.01µF LTC1520 TA01 –5 0 5 3.3k Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. U U 10 15 20 25 30 35 40 45 TIME (ns) LTC1520 TA02 1 LTC1520 ABSOLUTE (Note 1) AXI U RATI GS PACKAGE/ORDER I FOR ATIO TOP VIEW B1 1 A1 2 OUT 1 3 ENABLE 4 OUT 2 5 A2 6 B2 7 GND 8 16 VDD 15 B4 14 A4 13 OUT 4 12 NC 11 OUT 3 10 A3 9 B3 Supply Voltage ....................................................... 10V Digital Input Currents ..................... – 100mA to 100mA Digital Input Voltages ............................... – 0.5V to 10V Receiver Input Voltages ........................................ ± 10V Receiver Output Voltages ............. – 0.5V to VDD + 0.5V Short-Circuit Duration .................................... Indefinite Operating Temperature Range .................... 0°C to 70°C Storage Temperature Range ................ – 65°C to 150°C Lead Temperature (Soldering, 10 sec)................. 300°C ORDER PART NUMBER LTC1520CS S PACKAGE 16-LEAD PLASTIC SO TJMAX = 150°C, θJA = 90°C/ W Consult factory for Industrial and Military grade parts. DC ELECTRICAL CHARACTERISTICS VDD = 5V (Notes 2, 3) per receiver, unless otherwise noted. SYMBOL VCM VIH VIL IIN1 IIN2 RIN CIN VOC VID(MIN) dVID VOH VOL IOZR IDD IOSR CMRR PARAMETER Input Common Mode Voltage Input High Voltage Input Low Voltage Input Current Input Current (A, B) Input Resistance (Figure 5) A, B Input Capacitance Open-Circuit Input Voltage (Figure 5) Differential Input Threshold Voltage Input Hysteresis Output High Voltage Output Low Voltage Three-State Output Current Total Supply Current All 4 Receivers Short-Circuit Current Common Mode Rejection Ratio VDD = 5V (Note 4) – 0.2V < VCM < VDD + 0.2V VCM = 2.5V IOUT = – 4mA, VID = 0.1V, VDD = 5V IOUT = 4mA, VID = 0.1V, VDD = 5V 0V ≤ VOUT ≤ 5V VID ≥ 0.1V, No Load, Enable = 5V VOUT = 0V, VOUT = 5V VCM = 2.5V, f = 25MHz q q q q q q q q CONDITIONS A, B Inputs Enable Input Enable Input Enable Input VA, VB = 5V VA, VB = 0 – 0.2V ≤ VCM ≤ VDD + 0.2V q q q q q q q MIN – 0.2 2 TYP MAX VDD + 0.2 0.8 UNITS V V V µA µA µA kΩ pF –1 – 250 18 3 3.2 – 0.1 20 4.6 3.3 1 250 3.4 0.1 0.4 – 10 12 – 50 45 10 20 50 2 U V V mV V V µA mA mA dB W U U W W W LTC1520 U W SWITCHI G TI E CHARACTERISTICS VDD = 5V (Notes 2, 3) VID = 500mV, VCM = 2.5V, unless otherwise noted. SYMBOL tPLH, tPHL tr, tf tSKD tZL tZH tLZ tHZ tCH-CH tPKG-PKG PARAMETER Input-to-Output Propagation Delay Rise/Fall Times tPLH – tPHL Skew CONDITIONS CL = 15pF (Figure 1) CL = 15pF CL = 15pF, Same Receiver (Note 5) CL = 15pF (Figure 2) CL = 15pF (Figure 2) CL = 15pF (Figure 2) CL = 15pF (Figure 2) CL = 15pF (Figure 3) (Note 6) CL = 15pF, S.


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