LTC1518/LTC1519 52Mbps Precision Delay RS485 Quad Line Receivers FEATURES DESCRIPTIO n Precision Propagation Delay: 18.5ns 3.5ns Over The LTC 1518/LTC1519 are high speed, precision delay 0 C to 70 C Temperature Range differential quad bus/line receivers that can operate at data n High Data Rate: 52Mbps rates as high as 52Mbps. They are pin compatible with the n Low t /t Skew: 500ps Typ LTC488/LTC489 RS485 line receivers and operate over the PLH PHL n Low Channel-to-Channel Skew: 500ps Typ entire 7V to 12V common mode range. A unique architec- n Guaranteed Fail-Safe Operation over the Entire ture provides very stable propagation delays and low skew Common Mode Range over wide input common mode, input overdrive and ambi- n 7V to 12V RS485 Input Common Mode Range ent temperature ranges. Propagation delay is 18.5ns 3.5ns n Input Resistance 22k, Even When Unpowered over the commercial temperature range. Typical t /t PLH PHL TM n Hot Swap Capable and channel-to-channel skew is 500ps. n High Common Mode Rejection to 26MHz Each receiver translates differential input levels ( V ID n Short-Circuit Protection: 10mA Typ Output Current 300mV) into valid CMOS and TTL output levels. Its high for an Indefinite Short input resistance ( 22k) allows many receivers to be con- n Three-State Output Capability nected to the same driver. The receiver outputs go into a n Will Not Oscillate with Slow Moving Input Signals high impedance state when disabled. n Single 5V Supply n The receivers have a fail-safe feature that guarantees a high Pin Compatible with LTC488, LTC489 output state when the inputs are shorted or left floating. U Other protection features include thermal shutdown and a APPLICATIO S controlled maximum short-circuit current (50mA Max). n High Speed RS485/RS422 Receivers Input resistance remains 22k when the device is n STS-1/OC-1 Data Receivers unpowered or disabled, thus allowing hot swapping with- n PECL Line Receivers out loading the data lines. n Level Translators The LTC1518/LTC1519 operate from a single 5V supply n Fast-20/Fast-40 SCSI Receiver and draw 12mA of supply current. , LTC and LT are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. Propagation Delay Guaranteed to Fall TYPICAL APPLICATIO Within Shaded Area ( 3.5ns) T = 0C TO 70C A 52Mbps Data Communication over Twisted Pair RECEIVER RE RE INPUT V = IN V = 1.5V 2 2 ID 3V/DIV 1 1 RO RO RECEIVER OUTPUT V = 7 7 OUT V = 5V DD 4 4 5V/DIV 100W 100W DI DI 6 6 3 3 A 1 2 B DE DE 4 EN LTC1685 1/4 LTC1518 LTC1685 EN 12 3 RO 1518/19 F08 50 51021503250435045 TIME (ns) 1518/19 TA02 1 U ULTC1518/LTC1519 ABSOLUTE AXI U RATI GS (Note 1) Supply Voltage ....................................................... 10V Short-Circuit Duration .................................... Indefinite Digital Input Currents ..................... 100mA to 100mA Operating Temperature Range Digital Input Voltages ............................... 0.5V to 10V LTC1518C/LTC1519C ............................. 0 C to 70 C Receiver Input Voltages ........................................ 14V LTC1518I/LTC1519I .......................... 40 C to 85 C Receiver Output Voltages ............. 0.5V to V + 0.5V Storage Temperature Range ................ 65 C to 150 C DD Receiver Input Differential ....................................... 10V Lead Temperature (Soldering, 10 sec)................. 300 C UUW PACKAGE/ORDER I FOR ATIO TOP VIEW TOP VIEW ORDER PART ORDER PART NUMBER NUMBER 1 16 B1 1 16 V B1 V DD DD 2 15 A1 2 15 B4 A1 B4 LTC1518CS LTC1519CS 3 14 OUT 1 3 14 A4 OUT 1 A4 LTC1519IS LTC1518IS 4 13 EN12 4 13 OUT 4 EN OUT 4 5 12 OUT 2 5 12 EN34 OUT 2 EN 6 11 A2 6 11 OUT 3 A2 OUT 3 7 10 B2 7 10 A3 B2 A3 8 9 GND 8 9 B3 GND B3 S PACKAGE S PACKAGE 16-LEAD PLASTIC SO 16-LEAD PLASTIC SO T = 150 C, q = 90 C/ W T = 150 C, q = 90 C/ W JMAX JA JMAX JA Consult factory for Military grade parts. DC ELECTRICAL CHARACTERISTICS The l denotes specifications which apply over the full operating temperature range, otherwise specifications are at T = 25 C. V = 5V 5% (Notes 2, 3) per receiver, unless otherwise noted. A DD SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Input Common Mode Voltage A, B Inputs l 7 12 V CM V Input High Voltage EN, EN, EN12, EN34 l2V IH V Input Low Voltage EN, EN, EN12, EN34 l 0.8 V IL I Input Current EN, EN, EN12, EN34 l 1 1 m A IN1 I Input Current (A, B) V , V = 12V l 500 m A IN2 A B V , V = 7V l 500 m A A B R Input Resistance 7V V 12V (Figure 5) l 22 kW IN CM C Input Capacitance (Note 4) 3 pF IN V Open-Circuit Input Voltage V = 5V (Note 4) (Figure 5) l 3.2 3.3 3.4 V OC DD V Differential Input Threshold Voltage 7V V 12V l 0.3 0.3 V ID(MIN) CM dV Input Hysteresis V = 2.5V 25 mV ID CM V Output High Voltage I = 4mA, V = 0.3V, V = 5V l 4.6 V OH OUT ID DD V Output Low Voltage I = 4mA, V = 0.3V, V = 5V l 0.4 V OL OUT ID DD I Three-State Output Current 0V < V < 5V l 10 10 m A OZR OUT I Total Supply Current All 4 Receivers V > 0.3V, No Load, Device Enabled l 12 20 mA DD ID I Short-Circuit Current V = 0V, V = 5V (Note 7) l 50 50 mA OSR OUT OUT 2 U WWW