LTC1326 Datasheet, PDF (1/16 Pages) Linear Technology – Micropower Precision Triple Supply Monitors

FEATURES
s _{Simultaneously Monitors Three Supplies}
LTC1326: 5V, 3.3V and ADJ
LTC1326-2.5: 2.5V, 3.3V and ADJ
s _{Guaranteed Threshold Accuracy: ±0.75%}
s _{Low Supply Current: 20µA}
s _{Internal Reset Time Delay: 200ms}
s _{Manual Push-Button Reset Input}
s _{Active Low and Active High Reset Outputs}
s _{Active Low “Soft” Reset Output}
s _{Power Supply Glitch Immunity}
s _{Guaranteed RESET for VCC3 ≥ 1V or VCC5 ≥ 1V}
or V_CC25 ≥ 1V
s _{8-Pin SO and MSOP Packages}
U
APPLICATIO S
s _{Desktop Computers}
s _{Notebook Computers}
s _{Intelligent Instruments}
s _{Portable Battery-Powered Equipment}
LTC1326/LTC1326-2.5
Micropower Precision
Triple Supply Monitors
DESCRIPTIO
The LTC^®1326/LTC1326-2.5 are triple supply monitors
intended for systems with multiple supply voltages. They
provide micropower operation, small size and high accu-
racy supply monitoring.
Tight 0.75% threshold accuracy and glitch immunity
ensure reliable reset operation without false triggering.
The 20µA typical supply current makes the LTC1326/
LTC1326-2.5 ideal for power-conscious systems.
The RST output is guaranteed to be in the correct state for
V_CC3, V_CC5 or V_CC25 down to 1V. The LTC1326/LTC1326-2.5
can be configured to monitor one, two or three inputs,
depending on system requirements.
A manual push-button reset input provides the ability to
generate a very narrow “soft” reset pulse (100µs typ) or a
200ms reset pulse equivalent to a power-on reset. Both
SRST and RST outputs are open-drain and can be OR-tied
with other reset sources.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
DC/DC
CONVERTER
2.5V
3.3V
V_CORE
0.1µF
PUSH-BUTTON
RESET
V_CC25 V_CC3 V_CCA
LTC1326-2.5
RST
PBR
SRST
GND
SYSTEM
LOGIC
1326/2.5 TA01
RST Output Voltage vs Supply Voltage (LTC1326-2.5)
3.5
V_CC25 = V_CCA = V_CC3
3.0 4.7k PULL-UP FROM RST TO V_CC3
T_A = 25°C
2.5
2.0
1.5
1.0
0.5
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
V_CC3 (V)
1326/2.5 TA02
1