LT1711/LT1712 Single/Dual 4.5ns, 3V/5V/ 5V, Rail-to-Rail Comparators FEATURES DESCRIPTIO TM n Ultrafast: 4.5ns at 20mV Overdrive The LT 1711/LT1712 are UltraFast 4.5ns comparators 5.5ns at 5mV Overdrive featuring rail-to-rail inputs, rail-to-rail complementary out- n Rail-to-Rail Inputs puts and an output latch. Optimized for 3V and 5V power n Rail-to-Rail Complementary Outputs (TTL/CMOS supplies, they operate over a single supply voltage range Compatible) from 2.4V to 12V or from 2.4V to 6V dual supplies. n Specified at 2.7V, 5V and 5V Supplies The LT1711/LT1712 are designed for ease of use in a n Output Latch variety of systems. In addition to wide supply voltage n Inputs Can Exceed Supplies Without Phase Reversal flexibility, rail-to-rail input common mode range extends n LT1711: 8-Lead MSOP Package 100mV beyond both supply rails, and the outputs are n LT1712: 16-Lead Narrow SSOP Package protected against phase reversal for inputs extending U further beyond the rails. Also, the rail-to-rail inputs may be APPLICATIO S taken to opposite rails with no significant increase in input current. The rail-to-rail matched complementary outputs n High Speed Automatic Test Equipment interface directly to TTL or CMOS logic and can sink 10mA n Current Sense for Switching Regulators + to within 0.5V of GND or source 10mA to within 0.7V of V . n Crystal Oscillator Circuits n High Speed Sampling Circuits The LT1711/LT1712 have internal TTL/CMOS compatible n High Speed A/D Converters latches for retaining data at the outputs. Each latch holds n Pulse Width Modulators data as long as the latch pin is held high. Latch pin n Window Comparators hysteresis provides protection against slow moving or n Extended Range V/F Converters noisy latch signals. The LT1711 is available in the 8-pin n Fast Pulse Height/Width Discriminators MSOP package. The LT1712 is available in the 16-pin n Line Receivers narrow SSOP package. n High Speed Triggers , LTC and LT are registered trademarks of Linear Technology Corporation. UltraFast is a trademark of Linear Technology Corporation. TYPICAL APPLICATIO A 4 NTSC Subcarrier Voltage-Tunable Crystal Oscillator 5V LT1711/LT1712 Propagation Delay 47k* vs Input Overdrive LT1004-2.5 1N4148 3.9k* V IN 0V TO 5V 6.0 T = 25C 1M A 1M* 1k* + V = 5V 5.5 V = 0V MV-209 5V V = 100mV STEP VARACTOR 1M 0.047F DIODE 1M C SELECT 5.0 2k + (CHOOSE FOR CORRECT t PD 100pF PLL LOOP RESPONSE) 4.5 390W Y1** 15pF 100pF t PD 4.0 + LT1711 3.5 FREQUENCY OUTPUT 171112 TA01 2k 3.0 0 10 20 40 50 60 30 200pF INPUT OVERDRIVE (mV) * 1% FILM RESISTOR 171112 TA02 ** NORTHERN ENGINEERING LABS C-2350N-14.31818MHz 1 PROPAGATION DELAY (ns) U ULT1711/LT1712 ABSOLUTE AXI U RATI GS (Note 1) Supply Voltage Output Current (Continuous) .............................. 20mA + V to V ............................................................ 12.6V Operating Temperature Range ................ 40 C to 85 C + V to GND ........................................................ 12.6V Specified Temperature Range (Note 2) ... 40 C to 85 C V to GND .............................................10V to 0.3V Junction Temperature.......................................... 150 C Differential Input Voltage ................................... 12.6V Storage Temperature Range ................. 65 C to 150 C Latch Pin Voltage...................................................... 7V Lead Temperature (Soldering, 10 sec).................. 300 C Input and Latch Current ..................................... 10mA UUW PACKAGE/ORDER I FOR ATIO TOP VIEW ORDER PART ORDER PART LATCH NUMBER NUMBER IN A 1 16 ENABLE A +IN A 2 15 GND TOP VIEW LT1711CMS8 LT1712CGN V 3 14 Q A + V 1 8 Q LT1711IMS8 LT1712IGN + V 4 13 Q A 7 Q +IN 2 + IN 3 6 GND V 5 12 Q B 5 LATCH V 4 V 6 11 Q B ENABLE MS8 PACKAGE MS8 PART MARKING GN PART MARKING +IN B 7 10 GND 8-LEAD PLASTIC MSOP LATCH IN B 8 9 T = 150 C, q = 250 C/ W (NOTE 12) ENABLE B JMAX JA LTTC 1712 GN PACKAGE LTTD 1712I 16-LEAD PLASTIC SSOP T = 150 C, q = 120 C/ W (NOTE 12) JMAX JA Consult factory for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The l denotes specifications which apply over the full operating temperature range, otherwise specifications are at T = 25 C. A + + + V = 2.7V or V = 5V, V = 0V, V = V /2, V = 0.8V, C = 10pF, V = 20mV, unless otherwise specified. CM LATCH LOAD OVERDRIVE SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS + V Positive Supply Voltage Range l 2.4 7 V + V Input Offset Voltage (Note 4) R = 50W , V = V /2 0.5 5.0 mV OS S CM + R = 50W , V = V /2 l 6.0 mV S CM R = 50W , V = 0V 0.7 mV S CM + R = 50W , V = V 1mV S CM D V /D T Input Offset Voltage Drift l 10 m V/ C OS I Input Offset Current 0.2 3 m A OS l 6 m A I Input Bias Current (Note 5) 18 5 5 m A B l 35 10 m A + V Input Voltage Range (Note 9) l 0.1 V + 0.1 V CM + CMRR Common Mode Rejection Ratio V = 5V, 0V V 5V 56 65 dB CM + V = 5V, 0V V 5V l 53 dB CM + V = 2.7V, 0V V 2.7V 54 65 dB CM + V = 2.7V, 0V V 2.7V l 50 dB CM + + PSRR Positive Power Supply Rejection Ratio 2.4V V 7V, V = 0V 58 75 dB CM l 56 dB 2 U WWW