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LTC2904CDDBTRMPBF Datasheet(PDF) 7 Page - Linear Technology

Part # LTC2904CDDBTRMPBF
Description  Precision Dual Supply Monitors with Pin-Selectable Thresholds
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC2904CDDBTRMPBF Datasheet(HTML) 7 Page - Linear Technology

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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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