PDF LTC1520CS Data sheet ( Hoja de datos )

Número de pieza	LTC1520CS
Descripción	50Mbps Precision Quad Line Receiver
Fabricantes	Linear Technology
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No Preview Available ! FEATURES s Precision Propagation Delay: 18ns ±3ns Over Temperature s Data Rate: 50Mbps s Low tPLH/tPHL Skew: 500ps Typ s Low Channel-to-Channel Skew: 400ps Typ s Rail-to-Rail Input Common Mode Range s High Input Resistance: ≥ 18k, Even When Unpowered s Hot Swap Capable s Can Withstand Input DC Levels of ±10V s Short-Circuit Protected s Single 5V Supply s LVDS Compatible s Will Not Oscillate with Slow Input Signals U APPLICATIONS s High Speed Backplane Interface s Line Collision Detector s PECL and LVDS Line Receivers s Level Translator s Ring Oscillator s Tapped Delay Line , LTC and LT are registered trademarks of Linear Technology Corporation. Final Electrical Specifications LTC1520 50Mbps Precision Quad Line Receiver DESCRIPTION May 1996 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. Propaga- tion 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 con- nected to the same driver. The receiver outputs go into a high impedance state when disabled. Protection features include thermal shutdown and a con- trolled 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. TYPICAL APPLICATION High Speed Backplane Receiver LTC1520 + +– –+ – + Propagation Delay Guaranteed to Fall Within Shaded Area (±3ns) VIN = 1V/DIV VOUT = 5V/DIV RECEIVER OUTPUT VDD = 5V RECEIVER INPUT VID = 500mV – 5V – 5 0 5 10 15 20 25 30 35 40 45 3.3k TIME (ns) LTC1520 TA02 3.3k 0.01µF LTC1520 TA01 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 represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 1 1 page UW W SWITCHI G TI E WAVEFOR S 3V ENABLE 0V 5V OUT 1 VOL VOH OUT 1 0V 1.5V t ZL OUTPUT 1.5V NORMALLY LOW 1.5V t LZ 0.2V 1.5V OUTPUT NORMALLY HIGH t ZH t HZ 0.2V RECEIVER OUTPUT S1 CL 1k S2 1k VDD 1520 F02 Figure 2. Receiver Enable and Disable Timing Test Circuit and Waveforms LTC1520 INPUT A1, A2 3V B1, B2 = 2.5V 2V CH1 OUT tCH-CH VDD/2 VDD/2 tCH-CH CH2 OUT VDD/2 VDD/2 1520 F03 Figure 3. Any Channel to Any Channel Skew, Same Package INPUT A1, B1 VID = 500mV SAME INPUT FOR BOTH PACKAGES PACKAGE 1 OUT 1 PACKAGE 2 OUT 1 tPKG-PKG tPKG-PKG 1520 F04 Figure 4. Package-to-Package Propagation Delay Skew UU EQUIVALE T I PUT NETWORKS ≥18k A 3.3V ≥18k B 3.3V ≥18k A ≥18k B RECEIVER ENABLED, VDD = 5V RECEIVER DISABLED OR VDD = 0V 1520 F05 Figure 5. Input Thevenin Equivalent APPLICATIONS INFORMATION Theory of Operation Unlike typical line receivers whose propagation delay can vary by as much as 500% from package to package and show significant temperature drift, the LTC1520 employs a novel architecture that produces a tightly controlled and temperature compensated propagation delay. The differ- ential timing skew is also minimized between rising and falling output edges, and the propagation delays of any two receivers within a package are very tightly matched. The precision timing features of the LTC1520 reduce overall system timing constraints by providing a narrow 6ns window during which valid data appears at the re- ceiver output. This output timing window applies to all receivers in all packages over all operating temperatures 5 5 Page

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