LTC2900 View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LTC2900 Datasheet PDF : 16 Pages
| |||
LTC2900
APPLICATIO S I FOR ATIO
Ensuring Reset Valid for VCC Down to 0V (LTC2900-2)
Some applications require the reset output (RST) to be
valid with VCC down to 0V. The LTC2900-2 is designed to
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
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.
TYPICAL APPLICATIO S
Quad Supply Monitor with Push-Button Reset
5V, 3V, 1.8V, 12V (ADJ)
1.8V
5V
SYSTEM
RESET
CRT
1
V3
V2 10
2 V1
9
V4
3 LTC2900 8
CRT
VREF
4
RST
7
VPG
5
6
PBR
GND
NORMALLY
OPEN
3V
R3
2.15M
1%
R4
100k
1%
12V
VTRIP = 11.25V
2900 TA02
5V, – 5V Monitor and Unused V2, V3 Inputs
Pulled Above Trip Thresholds
5V
SYSTEM
RESET
CRT
1
V3
V2 10
2 V1
V4 9
3 LTC2900 8
CRT
VREF
4
RST
7
VPG
5
6
PBR
GND
R3
464k
1%
R1 R4
16.2k 121k
1% 1%
–5V
VTRIP = –4.64V
R2
86.6k
1%
2900 TA03
2900f
12
Share Link: 