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LTC2905CTS8TRPBF Datasheet(PDF) 7 Page - Linear Technology |
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LTC2905CTS8TRPBF Datasheet(HTML) 7 Page - Linear Technology |
7 / 16 page LTC2904/LTC2905 7 29045fd PIN FUNCTIONS V2 (Pin 1/Pin 4): Voltage Input 2. Input for V2 monitor. Select from 3.3V, 2.5V, 1.8V, 1.5V, 1.2V or 1.0V. Refer to Table 1 for details. The greater of V1, V2 is also the internal supply voltage, VCC. Bypass this pin to ground with a 0.1μF (or greater) capacitor. RST (Pin 2/Pin 3): (LTC2904 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 VCC and may be pulled above VCC using an external pull-up. TMR (Pin 2/Pin 3): (LTC2905 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 200μs. A 22nF capacitor will generate a 200ms reset delay time. RST (Pin 3/Pin 2): Inverted Reset Logic Output. Pulls low when any voltage input is below the reset threshold and is held low for programmed delay time after all voltage inputs are above threshold. This pin has a weak pull-up to VCC and may be pulled above VCC using an external pull-up. GND (Pin 4/Pin 1, Pin 9): Ground. TOL (Pin 5/Pin 8): Three-state Input for Supply Tolerance Selection (5%, 7.5% or 10%). See the Applications Infor- mation section for tolerance selection chart (Table 2). S1 (Pin 6/Pin 7): Voltage Threshold Select Three-State Input. Connect to V1, GND or leave unconnected in open state (See Table 1). S2 (Pin 7/Pin 6): The Second Voltage Threshold Select Three-State Input. Connect to V1, GND or leave uncon- nected in open state (See Table 1). V1 (Pin 8/Pin 5): Voltage Input 1. Input for V1 monitor. Select from 5V, 3.3V, or 2.5V. See Table 1 for details. The greater of V1, V2 is also the internal supply voltage, VCC. Bypass this pin to ground with a 0.1μF (or greater) capacitor. (TS8/DDB8) TEMPERATURE ( C) 20 19 18 17 16 15 14 13 12 11 10 29045 G25 –50 100 25 75 –25 0 50 S1 = S2 = TOL = 3.3V TEMPERATURE ( C) –20 –19 –18 –17 –16 –15 –14 –13 –12 –11 –10 29045 G26 –50 100 25 75 –25 0 50 S1 = S2 = TOL = GND IS1, IS2, ITOL vs Temperature IS1, IS2, ITOL vs Temperature TYPICAL PERFORMANCE CHARACTERISTICS Specifications are at TA = 25°C unless otherwise noted. |
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