LTC2902 Просмотр технического описания (PDF) - Linear Technology
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LTC2902
Linear Technology
LTC2902 Datasheet PDF : 16 Pages
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LTC2902
TYPICAL PERFOR A CE CHARACTERISTICS
COMPX Pull-Up Current
vs V2 (COMPX Held at 0V)
20
TA = 25°C
18
16
14
12
10
8
6
4
2
0
1 1.5 2 2.5 3 3.5 4
V2 (V)
4.5 5
2902 G21
RST Pull-Up Current vs V2
(LTC2902-1)
20 TA = 25°C
18
16
14
12
10
8
6
VRT33
4
VRT30
VRT25
2
0
2 2.5 3 3.5 4 4.5 5
V2 (V)
2902 G23
COMPX Propagation Delay vs
Input Overdrive Above Threshold
250
TA = 25°C
200
150
100
V1, V2
50
V3, V4
0
10
100
1000
INPUT OVERDRIVE ABOVE THRESHOLD (mV)
2902 G22
RST Pull-Up Current vs V2
(LTC2902-2)
6
TA = 25°C
5
4
3
2
VRT33
VRT30
VRT25
1
0
2 2.5 3 3.5 4 4.5 5
V2 (V)
2902 G24
PI FU CTIO S
COMP3 (Pin 1): Comparator Output 3. Nondelayed, active
high logic output with weak pull-up to V2. Pulls high when
V3 is above reset threshold. May be pulled greater than V2
using external pull-up.
COMP1 (Pin 2): Comparator Output 1. Nondelayed, active
high logic output with weak pull-up to V2. Pulls high when
V1 is above reset threshold. May be pulled greater than V2
using external pull-up.
V3 (Pin 3): Voltage Input 3. Select from 2.5V, 1.8V, 1.5V
or ADJ. See Table 1 for details.
V1 (Pin 4): Voltage Input 1. Select from 5V or 3.3V. See
Table 1 for details. The greater of (V1, V2) is also VCC for
the chip. Bypass this pin to ground with a 0.1µF (or
greater) capacitor.
CRT (Pin 5): Reset Delay Time Programming Pin. Attach
an external capacitor (CRT) to GND to set a reset delay time
of 4.6ms/nF. Leaving the pin open generates a minimum
delay of approximately 50µs. A 47nF capacitor will gener-
ate a 216ms reset delay time.
2902f
7
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