ltc2900-2ims-trpbf Linear Technology Corporation, ltc2900-2ims-trpbf Datasheet - Page 12

• Manufacturer Part Number: ltc2900-2ims-trpbf
• Description: Programmable Quad Supply Monitor With Adjustable Reset Timer
• Manufacturer: Linear Technology Corporation

APPLICATIO S I FOR ATIO
LTC2900
Ensuring Reset Valid for V
Some applications require the reset output (RST) to be
valid with V
handle this requirement with the addition of an external
resistor from RST to ground. The resistor will provide a
path for stray charge and/or leakage currents, preventing
the RST output from floating to undetermined voltages
TYPICAL APPLICATIO S
12
CC
down to 0V. The LTC2900-2 is designed to
U
U
CC
Down to 0V (LTC2900-2)
U
W
Quad Supply Monitor with Push-Button Reset
5V, – 5V Monitor and Unused V2, V3 Inputs
SYSTEM
SYSTEM
C
RESET
RT
RESET
C
RT
5V
1.8V
Pulled Above Trip Thresholds
5V
U
5V, 3V, 1.8V, 12V (ADJ)
NORMALLY
OPEN
1
2
3
4
5
1
2
3
4
5
V3
V1
CRT
RST
PBR
V3
V1
CRT
RST
PBR
LTC2900
LTC2900
V
GND
V
V
GND
when connected to high impedance (such as CMOS logic
inputs). The resistor value should be small enough to
provide effective pull-down without excessively loading
the active pull-up circuitry. Too large a value may not pull
down well enough. A 100k resistor from RST to ground is
satisfactory for most applications.
REF
V
V2
V4
PG
REF
V2
V4
PG
10
9
8
7
6
10
9
8
7
6
2900 TA02
3V
2900 TA03
R4
100k
1%
R1
16.2k
1%
R2
86.6k
1%
2.15M
1%
R3
121k
1%
R4
12V
V
TRIP
464k
1%
R3
= 11.25V
–5V
V
TRIP
= –4.64V
2900f