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LTC6752-2 Datasheet(PDF) 18 Page - Linear Technology |
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LTC6752-2 Datasheet(HTML) 18 Page - Linear Technology |
18 / 30 page ![]() LTC6752/LTC6752-1/ LTC6752-2/LTC6752-3/ LTC6752-4 18 6752fc For more information www.linear.com/LTC6752 applicaTions inForMaTion Input Protection The input stage is protected against damage from condi- tions where the voltage on either pin exceeds the supply voltage (VCC to VEE) without external protection. External input protection circuitry is only needed if input currents can exceed the absolute maximum rating. For example, if an input is taken beyond 300mV of either the positive or negative supply, an internal ESD protection diode will conduct and an external resistor should be used to limit the current to less than 10mA. Outputs The LTC6752 family has excellent drive capability. The comparators can deliver typically ±22mA output current for an output supply of 2.5V, and ±39mA output current for a 3.3V output supply. Attention must be paid to keep the junction temperature of the IC below 150°C should the output have a continuous short-circuit condition. Logic Drive Capability The LTC6752 family has been designed to drive CMOS logic with a supply of 3.3V, 2.5V and 1.8V. For device reli- ability,theoutputpowersupply(VDD)shouldnotbehigher than 3.6V above the negative supply. When VDD is 3V or higher the CMOS outputs of the LTC6752 family provide valid TTL logic threshold levels and can easily interface with TTL logic devices operating with a 5V supply. This is possiblebecauseallofthethresholdlevelsassociatedwith TTL logic (VIH/VIL/VOH/VOL) are less than or equal to 2.4V Capacitive Loads The LTC6752 family can drive capacitive loads. Transient performance parameters in the Electrical Characteristics Tables and Typical Characteristics section are for a load of 5pF, corresponding to a standard TTL/CMOS load. The devices are fully functional for larger capacitive loads, howeverspeedperformancewilldegrade.Thegraphstitled Propagation Delay vs Capacitive Load and Toggle Rate vs CapacitiveLoadillustratetheimpactofchangestothetotal capacitive load. For optimal speed performance, output load capacitance should be reduced as much as possible. ESD The LTC6752 family members have reverse-biased ESD protection diodes on pins as shown in Figure 1. There are additional clamps between the positive and negative supplies that further protect the device during ESD strikes. Hot-plugging of the device into a powered socketisnotrecommendedsincethiscantriggertheclamp resultinginlargecurrentsflowingbetweenthesupplypins. Hysteresis Comparators have very high open-loop gain. With slow input signals that are close to each other, input noise can cause the output voltage to switch randomly. This can be addressed by hysteresis which is positive feedback that increases the trip point in the direction of the input signal transition when the output switches. This pulls the inputs away from each other, and prevents continuous switching back and forth. The addition of positive feedback also has theeffectofmakingthesmallsignalgaininfinitearoundthe trip points. Hysteresis is designed into most comparators and the LTC6752 family has adjustable hysteresis with a default hysteresis of 5mV. The input-output transfer characteristic is illustrated in Figure 3 showing the definitions of VOS and HYST based upon the two measurable trip points. In some cases, additional noise immunity is required above what is provided by the nominal 5mV hysteresis. Figure 3 VOH VOL 0 VOS = 6752 F03 VOUT VOS VTRIP+ VHYST (= VTRIP+ – VTRIP–) ∆VIN = VIN+ – VIN– VTRIP+ + VTRIP– 2 VTRIP– FOR VTRIP+ = 3mV, VTRIP– = –2mV, VOS = 0.5mV, VHYST = 5mV |
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