LT1671 60ns, Low Power, Single Supply, Ground-Sensing Comparator FEATURES DESCRIPTIO n Low Power: 450m A The LT 1671 is a low power 60ns comparator with comple- n Fast: 60ns at 20mV Overdrive mentary outputs and latch. The input common mode 85ns at 5mV Overdrive range extends from 1.5V below the positive supply down n Low Offset Voltage: 0.8mV to the negative supply rail. Like the LT1394, LT1016 and n Operates Off Single 5V or Dual 5V Supplies LT1116, this comparator has complementary outputs n Input Common Mode Extends to Negative Supply designed to interface directly to TTL or CMOS logic. The n No Minimum Input Slew Rate Requirement LT1671 may operate from either a single 5V supply or dual n Complementary TTL Outputs 5V supplies. Low offset voltage specifications and high n Inputs Can Exceed Supplies without Phase Reversal gain allow the LT1671 to be used in precision applications. n Pin Compatible with LT1394, LT1016 and LT1116 The LT1671 is designed for improved speed and stability n Output Latch Capability for a wide range of operating conditions. The output stage n Available in 8-Lead MSOP and SO Packages provides active drive in both directions for maximum speed into TTL, CMOS or passive loads with minimal U cross-conduction current. Unlike other fast comparators, APPLICATIO S the LT1671 remains stable even for slow transitions n High Speed A/D Converters through the active region, which eliminates the need to n Zero-Crossing Detectors specify a minimum input slew rate. n Current Sense for Switching Regulators The LT1671 has an internal, TTL/CMOS compatible latch n Extended Range V/F Coverters for retaining data at the outputs. The latch holds data as n Fast Pulse Height/Width Discriminators long as the LATCH pin is held high. Device parameters n High Speed Triggers such as gain, offset and negative power supply current are n Line Receivers not significantly affected by variations in negative supply n High Speed Sampling Circuits voltage. , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO Propagation Delay vs Overdrive 140 1MHz Crystal Oscillator V = 5V S V = 100mV STEP 5V 120 T = 25C A R = 1M L 1MHz CRYSTAL 2k (AT-CUT) 100 80 + FALLING EDGE (t ) PDHL 60 LT1671 OUTPUT 2k 40 2k RISING EDGE (t ) PDLH 0.068F 20 0 10 20 30 40 50 1671 TA01 1671 TA01 OVERDRIVE (mV) 1671 TA02 1 TIME (ns) U ULT1671 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 NUMBER NUMBER TOP VIEW + V 1 8 Q OUT + V 1 8 Q OUT + +IN 2 7 Q OUT LT1671CS8 +IN 2 7 Q OUT LT1671CMS8 IN 3 6 GND IN 3 6 GND LT1671IS8 V 4 5 LATCH LATCH ENABLE V 4 5 ENABLE MS8 PACKAGE MS8 PART MARKING S8 PART MARKING 8-LEAD PLASTIC MSOP S8 PACKAGE 8-LEAD PLASTIC SO 1671 LTCT T = 150 C, q = 250 C/ W JMAX JA T = 150 C, q = 190 C/ W JMAX JA 1671I 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 10 100 nA OS l 150 nA I Input Bias Current (Note 5) 120 280 nA B l 350 nA 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 85 dB 7V V 2V l 60 90 dB A Small Signal Voltage Gain 1V V 2V 2500 5000 V/V V OUT 2 U W U W U WW