Datasheet

13
LTC1326/LTC1326-2.5
132625fc
TYPICAL APPLICATIONS N
U
Monitoring a Negative Supply
1
2
3
4
8
7
6
5
V
CC3
V
CC5
V
CCA
GND
PBR
SRST
RST
RST
LTC1326
5V
–5V
3.3V
C2
0.1µF
SYSTEM RESET
1326/2.5 TA12
R1
150k
1%
R3
100k
1%
V
CCA
R2
150k
1%
R4
392k
1%
C1
0.1µF
Q1
2N3906
Q3
2N3904
Q2
2N3906
R4 ≈ (100k)(0.98)(V
TRIP
+ 0.55)(–1)
1
2
3
4
8
7
6
5
V
CC3
V
CC25
V
CCA
GND
PBR
SRST
RST
RST
LTC1326-2.5
2.5V
SYSTEM RESET
R2
1326/2.5 TA13
R1
ADJUSTABLE
SUPPLY
3.3V
100k
Reset Valid for V
CC3
Down to 0V
V
CC3
(V)
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
RST OUTPUT VOLTAGE (V)
1326/2.5 TA13a
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
V
CC3
= V
CC25
= V
CCA
T
A
= 25°C
RST OUTPUT WITH
100k PULL-UP TO V
CC3
RST OUTPUT
WITHOUT
100k PULL-UP.
10M LOAD TO GND
SUPPLY V
TRIP
R4
– 5V – 4.6V 392k
–3.3V – 3V 237k
–12V –10.8V 1M