LTC1985-1.8_15 Datasheet, PDF (1/8 Pages) Linear Technology – Micropower Precision Triple Supply Monitor with Push-Pull Reset Output in a 5-Lead SOT-23 Package

LTC1985-1.8
Micropower Precision
Triple Supply Monitor
with Push-Pull Reset Output
in a 5-Lead SOT-23 Package
FEATURES
s _{Monitors Three Inputs Simultaneously:}
3V, 1.8V and Adjustable
s _{±1.5% Threshold Accuracy Over Temperature}
s _{Very Low Supply Current: 10µA Typ}
s _{200ms Reset Time Delay}
s _{Power Supply Glitch Immunity}
s _{Guaranteed RESET for VCC3 ≥ 1V or VCC18 ≥ 1V}
s _{3V Active-Low Push-Pull Reset Output}
s _{5-Lead SOT-23 Package}
U
APPLICATIO S
s _{Desktop Computers}
s _{Notebook Computers}
s _{Intelligent Instruments}
s _{Portable Battery-Powered Equipment}
s _{Network Servers}
DESCRIPTIO
The LTC^®1985-1.8 is a triple supply monitor intended for
systems with multiple supply voltages. The reset output
remains low until all three supplies have been in compli-
ance for 200ms. Tight 1.5% accuracy specifications and
glitch immunity ensure reliable reset operation without
false triggering.
The RST output is guaranteed to be in the correct state for
V_CC18 or V_CC3 down to 1V. The LTC1985 may also be
configured to monitor any one or two V_CC inputs instead
of three, depending on system requirements.
Very low (10µA typical) supply current makes the LTC1985
ideal for power conscious systems.
The LTC1985 is available in a 5-lead SOT-23 package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
3V
DC/DC 1.8V
CONVERTER _2.5V
0.1µF
0.1µF
SYSTEM
LOGIC
1
5
RST
V_CC3
LTC1985-1.8
4
R1
V_CC18
130k
1% 3
R2
V_CCA
100k
GND
1%
2
1985-1.8 TA01
1