LT1394 7ns, Low Power, Single Supply, Ground-Sensing Comparator FEATURES DESCRIPTIO TM n UltraFast : 7ns The LT 1394 is an UltraFast(7ns) comparator with comple- n Low Power: 6mA mentary outputs and latch. The input common mode range n Low Offset Voltage: 0.8mV extends from 1.5V below the positive supply down to the n Operates Off Single 5V or Dual 5V Supplies negative supply rail. Like the LT1016, LT1116 and LT1671, n Input Common Mode Extends to Negative Supply this comparator has complementary outputs designed to n No Minimum Input Slew Rate Requirement interface directly to TTL or CMOS logic. The LT1394 may n Complementary TTL Outputs operate from either a single 5V supply or dual 5V supplies. n Inputs Can Exceed Supplies without Phase Reversal Low offset voltage specifications and high gain allow the n Pin Compatible with LT1016, LT1116 and LT1671 LT1394 to be used in precision applications. n Output Latch Capability The LT1394 is designed for improved speed and stability for n Available in 8-Lead MSOP and SO Packages a wide range of operating conditions. The output stage U provides active drive in both directions for maximum speed APPLICATIO S into TTL, CMOS or passive loads with minimal cross-conduc- tion current. Unlike other fast comparators, the LT1394 n High Speed A/D Converters remains stable even for slow transitions through the active n Zero-Crossing Detectors region, which eliminates the need to specify a minimum input n Current Sense for Switching Regulators slew rate. n Extended Range V/F Coverters n Fast Pulse Height/Width Discriminators The LT1394 has an internal, TTL/CMOS compatible latch for n High Speed Triggers retaining data at the outputs. The latch holds data as long as n Line Receivers the LATCH pin is held high. Device parameters such as gain, n High Speed Sampling Circuits offset and negative power supply current are not significantly affected by variations in negative supply voltage. , LTC and LT are registered trademarks of Linear Technology Corporation. UltraFast is a trademark of Linear Technology Corporation. TYPICAL APPLICATIO 45MHz Single Supply Adaptive Trigger Propagation Delay vs Input Overdrive 5V 2k 12 6 T = 25C 3 A 1 5 V = 100mV STEP Q1 Q2 10 V = 5V S 5V 3M 4 2 8 5V 500pF + 0.005F t A1 + PDLH 6 LT1227 t A2 PDHL 0.005F LT1006 Q1, Q2, Q3, Q4 = CA3096 ARRAY: 4 TIE SUBSTRATE (PIN 16) TO GROUND 13 3M 10 = 1N4148 2k 750 510 12 14 5V Q4 Q3 2 36 11 15 470 0 + + 0 10 20 30 40 50 2k 10F 0.1F 0.1F 100F OVERDRIVE (mV) + TRIGGER 0.1F LT1394 OUT 1394 TA02 470 INPUT 1394 F18 1 TIME (ns) U ULT1394 ABSOLUTE MAXIMUM RATINGS (Note 1) + Total Supply Voltage (V to V ) ............................... 12V Operating Temperature Range ................ 40 C to 85 C Positive Supply Voltage ............................................. 7V Specified Temperature Range (Note 3) ... 40 C to 85 C Negative Supply Voltage .......................................... 7V Junction Temperature........................................... 150 C Differential Input Voltage ....................................... 12V Storage Temperature Range ................. 65 C to 150 C Input and Latch Current (Note 2) ........................ 10mA Lead Temperature (Soldering, 10 sec).................. 300 C Output Current (Continuous)(Note 2) ................. 20mA PACKAGE/ORDER INFORMATION ORDER PART ORDER PART TOP VIEW TOP VIEW NUMBER NUMBER + + V 1 8 Q OUT V 1 8 Q OUT + +IN 2 7 Q OUT +IN 2 7 Q OUT LT1394CS8 LT1394CMS8 IN 3 6 GND 5 IN 3 6 GND LT1394IS8 V 4 LATCH ENABLE LATCH V 4 5 MS8 PACKAGE ENABLE MS8 PART MARKING S8 PART MARKING 8-LEAD PLASTIC MSOP S8 PACKAGE 8-LEAD PLASTIC SO T = 150 C, q = 250 C/ W JMAX JA LTBH 1394 T = 150 C, q = 190 C/ W JMAX JA 1394I Consult factory for Military grade parts. ELECTRICAL CHARACTERISTICS The l denotes specifications which apply over the full operating temperature range, otherwise specifications are T = 25 C. A + V = 5V, V = 5V, V (Q) = 1.4V, V = V = 0V unless otherwise noted. OUT LATCH CM SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Input Offset Voltage R 100W (Note 4) 0.8 2.5 mV OS S l 4.0 mV D V Input Offset Voltage Drift l 4 m V/ C OS D T I Input Offset Current 0.1 0.5 m A OS l 0.8 m A I Input Bias Current (Note 5) 2 4.5 m A B l 7.0 m A V Input Voltage Range (Note 6) l 5 3.5 V CMR Single 5V Supply l 0 3.5 V CMRR Common Mode Rejection Ratio 5V V 3.5V, T > 0 C 55 100 dB CM A 5V V 3.3V, T 0 C55 dB CM A Single 5V Supply 0V V 3.5V, T > 0 C 55 100 dB CM A 0V V 3.3V, T 0 C55 dB CM A + PSRR Power Supply Rejection Ratio 4.6V V 5.4V l 50 65 dB 7V V 2V l 65 100 dB A Small Signal Voltage Gain 1V V 2V 750 1600 V/V V OUT + V Output Voltage Swing High V 4.6V, I = 1mA l 2.7 3.1 V OH OUT + V 4.6V, I = 4mA l 2.4 3.0 V OUT 2 U W U W U WW