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MAX961 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX961 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 14 page Single/Dual/Quad, Ultra-High-Speed, +3V/+5V, Beyond-the-Rails Comparators _______________________________________________________________________________________ 9 Output Stage Circuitry The MAX961–MAX964/MAX997/MAX999 contain a cur- rent-driven output stage, as shown in Figure 4. During an output transition, ISOURCE or ISINK is pushed or pulled to the output pin. The output source or sink current is high during the transition, creating a rapid slew rate. Once the output voltage reaches VOH or VOL, the source or sink current decreases to a small value, capable of maintain- ing the VOH or VOL in static condition. This decrease in current conserves power after an output transition has occurred. One consequence of a current-driven output stage is a linear dependence between the slew rate and the load capacitance. A heavy capacitive load slows down the voltage output transition. Shutdown Mode When SHDN is high, the MAX961/MAX963/MAX964/ MAX997 shut down. When shut down, the supply cur- rent drops to 270µA per comparator, and the outputs become high impedance. SHDN has a high input impedance. Connect SHDN to GND for normal opera- tion. Exit shutdown with LE low; otherwise, the output is indeterminate. __________Applications Information Circuit Layout and Bypassing The MAX961–MAX964/MAX997/MAX999’s high band- width requires a high-speed layout. Follow these layout guidelines: 1) Use a PCB with a good, unbroken, low-inductance ground plane. 2) Place a decoupling capacitor (a 0.1µF ceramic sur- face-mount capacitor is a good choice) as close to VCC as possible. 3) On the inputs and outputs, keep lead lengths short to avoid unwanted parasitic feedback around the comparators. Keep inputs away from outputs. Keep impedance between the inputs low. 4) Solder the device directly to the printed circuit board rather than using a socket. 5) Refer to Figure 5 for a recommended circuit layout. 6) For slow-moving input signals, take care to prevent parasitic feedback. A small capacitor (1000pF or less) placed between the inputs can help eliminate oscillations in the transition region. This capacitor causes negligible degradation to tPD when the source impedance is low. Figure 4. Output Stage Circuitry MAX961-MAX964 MAX997 MAX999 ISOURCE Q, Q VCC GND ISINK Figure 5. MAX961 PCB Layout |
Similar Part No. - MAX961 |
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Similar Description - MAX961 |
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