High Speed Comparators High toggle rate, nanosecond propagation delay and tiny packages are the hallmarks of Linear Technology’s high speed comparators. Packed with innovative features, our complete family of high speed comparators allows your signal conditioning, timing and clock circuit designs to push the performance envelope. Part Number # Prop Comps Delay Toggle Rate Adj Hyst Latch Separate Shut Comp Supply Down Outputs LTC6752 1 2.9ns 280MHz LTC6752-1 1 2.9ns 280MHz l l LTC6752-2 1 2.9ns 280MHz l l l l LTC6752-3 1 2.9ns 280MHz l l l l l CMOS Output Logic 5V 3.3V 2.5V 1.8V Packages l l SOT-23 l l SC70 l l l l MSOP8 l l l l 9mm2 QFN l l l l SC70 l l l SOT-23, SO8 l l l MSOP8 l l LTC6752-4 1 2.9ns 280MHz l LT1719 1 4.2ns 70MHz l LT1711 1 4.5ns 100MHz LT1715 2 4ns 150MHz LT1712 2 4.5ns 100MHz l l LT1720 2 4.5ns 70MHz l l 9mm2 DFN, MSOP8, SO8 LT1721 4 4.5ns 70MHz l l SSOP16, SO16 l l l l l l l l MSOP10 l SSOP16 Featured High Speed Comparators: LTC6752 Family The LTC6752 is a family of 5 comparators, offered in different packages with a variety of features. These extremely fast CMOS output comparators can swing to within 200mV of the rail with up to 8mA of load current. Propagation delay is only 2.9ns and these comparators can support a toggle rate up to 280MHz. They exhibit only 4.5ps of jitter for a 100mVP-P 100MHz sinusoidal input. The CMOS outputs can support logic levels from 1.8V to 3.3V, and the inputs extend beyond both rails. 3.3V INPUT 50mV TO 3.3V PULSE MINIMUM PULSE WIDTH 10ns 3.3V 1.82k VCC VDD LTC6752-2 REF – VEE LE/HYST SHDN 200Ω Several of the LTC6752 options include an internal latch function. The internal latch retains the output state when the LE/HYST pin is within 300mV of the negative supply. This feature is ideal for detecting short pulses, as shown in this simple fast event capture circuit. Once a fast event occurs, this circuit will hold the output until a reset occurs, allowing the interface (such as a microprocessor) to acknowledge the event. + 1000pF RESET Fast Event Capture Circuit L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. OUT OUTPUT 3.3V OUT Low Power Comparators With supply currents starting at only 300nA, Linear Technology offers a broad line of ultralow power comparators. To achieve the lowest possible power and footprint, most of our low power comparators include an integrated precision voltage reference. For added design flexibility, the LTC1541 and LTC1542 also include a micropower, unity-gain stable op amp. Part Number # Voltage Supply Includes Comps Reference Current Op Amp Adj Hyst Dual Supply Supply Voltage Output* CMOS 9mm2 DFN, MSOP8, SO8 Packages LTC1540 1 1.182V 0.3μA l l 2V to 11V LTC1440 1 1.182V 2.1μA l l 2V to 11V CMOS 9mm2 DFN, MSOP8, SO8, PDIP8 LTC1542 1 NONE 5μA l 2.5V to 12.6V CMOS 9mm2 DFN, MSOP8, SO8 LTC1541 1 1.2V 5μA l 2.5V to 12.6V CMOS 9mm2 DFN, MSOP8, SO8 LT6703 1 400mV 6.5μA 1.4V to 18V OC ≤ 18V 4mm2 DFN, SOT-23 LT6703HV 1 400mV 6.5μA 1.4V to 18V OC ≤ 36V 4mm2 DFN, SOT-23 LTC1441 2 NONE 3.5μA 2V to 11V CMOS SO-8, PDIP8 LTC1442 2 1.182V 3.5μA 2V to 11V CMOS SO-8, PDIP8 LT6700 2 400mV 6.5μA 1.4V to 18V OC ≤ 18V 6mm2 DFN, SOT-23 LT6700HV 2 400mV 6.5μA 1.4V to 18V OC ≤ 36V 6mm2 DFN, SOT-23 LTC1443 4 1.182V 5μA 2V to 11V CMOS 20mm2 DFN, SO16, PDIP16 LTC1444 4 1.221V 5μA l 2V to 11V CMOS 20mm2 DFN, SO16, PDIP16 LTC1445 4 1.221V 5μA l 2V to 11V CMOS 20mm2 DFN, SO16, PDIP16 l l OC = Open-Collector output. Requires an external pull-up resistor. Featured Low Power Comparators: LT6700 Family The LT6700 combines two micropower comparators with a 400mV reference. Various options of the LT6700 offer unique combinations of input polarity. The opencollector outputs can be pulled up to 18V or 36V (depending on the option), and can sink more than 5mA over temperature. The LT6700 is an ideal choice for a micropower “gas gauge” with <2% total threshold error over temperature, as shown in this micropower battery monitor circuit. This example shows a simple 2-threshold “alkaline-cell” battery monitor: the bottom comparator goes low when battery voltage falls below 2V (1V per cell). The top comparator output goes low when the pack voltage falls below 1.6V (0.8V per cell), indicating that the battery pack has reached its end-oflife voltage. VBATT 1.4V (MIN) 3V (NOM) 5 R3 1M ALKALINE AA CELLS + + R4 1M LT6700-3 4 R2 63.4k + COMP B 6 – R1 261k VBATT > 1.6V – VR = 400mV REFERENCE 3 R5 1M VS COMP A 1 + VBATT > 2V C1 0.1μF 2 Micropower Battery Monitor www.linear.com/6752 n 1-800-4-LINEAR 0115A