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LTC2906 Datasheet(PDF) 6 Page - Linear Technology |
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LTC2906 Datasheet(HTML) 6 Page - Linear Technology |
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6 / 16 page  LTC2906/LTC2907 6 29067f PI FU CTIO S VCC (Pin 1/Pin 4): Optional Power Supply Pin. VCC powers and maintains the correct operation of the RST and RST pins in the complete absence of V1. If V1 is present, the greater of VCC or V1 (VMAX) powers the internal circuitry and the reset outputs. Bypass this pin to ground with a 0.1 µF (or greater) capacitor. Tie to V1 when no optional power is available. RST (Pin 2/Pin 3): (LTC2906 Only) Reset Logic Output. When all voltage inputs are above the reset threshold for at least the programmed delay time, this pin pulls low. This pin has a weak pull up to VMAX and may be pulled above VMAX using an external pull-up. TMR (Pin 2/Pin 3): (LTC2907 Only) Reset Delay Time Programming Pin. Attach an external capacitor (CTMR) to GND to set a reset delay time of 9ms/nF. Leaving the pin open generates a minimum delay of approximately 200 µs. A 22nF capacitor will generate a 200ms reset delay time. RST (Pin 3/Pin 2): Inverted Reset Logic Output. Pulls low when either V1 or VADJ is below the reset threshold and holds low for programmed delay time after all voltage inputs are above threshold. This pin has a weak pull up to VMAX and may be pulled above VMAX using an external pull-up. GND (Pin 4/Pin 1 and Pin 9): Ground. TOL (Pin 5/Pin 8): Three-State Input for Supply Tolerance Selection (5%, 7.5% or 10%). Refer to Applications Infor- mation for tolerance selection chart (Table 3). S1 (Pin 6/Pin 7): The Voltage Threshold Select Three- State Input. Connect to V1, GND or leave unconnected in open state to select one of three possible input threshold levels (refer to Table 1). VADJ (Pin 7/Pin 6): Adjustable Voltage Input. Bypass this pin to ground with a 0.1 µF (or greater) capacitor in a noisy environment. V1 (Pin 8/Pin 1): Voltage Input 1. Select from 5V, 3.3V or 2.5V. Refer to Table 1 for details. The greater of (V1, VCC) is also the internal VCC (VMAX). Bypass this pin to ground with a 0.1 µF (or greater) capacitor. (TS8 Package/DDB8 Package) TYPICAL PERFOR A CE CHARACTERISTICS TEMPERATURE ( °C) –20 –19 –18 –17 –16 –15 –14 –13 –12 –11 –10 29067 G22 –50 100 25 75 –25 0 50 S1 = TOL = GND V1 = 3.3V IS1, ITOL vs Temperature Specifications are at TA = 25°C unless otherwise noted. |
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Similar Description - LTC2906 |
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