LTC1326-2.5_15 Datasheet, PDF (1/16 Pages) Linear Technology – Micropower Precision Triple Supply Monitors

FEATURES
■ _{Simultaneously Monitors Three Supplies}
LTC1326: 5V, 3.3V and ADJ
LTC1326-2.5: 2.5V, 3.3V and ADJ
■ _{Guaranteed Threshold Accuracy: ±0.75%}
■ _{Low Supply Current: 20µA}
■ _{Internal Reset Time Delay: 200ms}
■ _{Manual Push-Button Reset Input}
■ _{Active Low and Active High Reset Outputs}
■ _{Active Low “Soft” Reset Output}
■ _{Power Supply Glitch Immunity}
■ _{Guaranteed RESET for VCC3 ≥ 1V or VCC5 ≥ 1V}
or V_CC25 ≥ 1V
■ _{8-Pin SO and MSOP Packages}
U
APPLICATIO S
■ _{Desktop Computers}
■ _{Notebook Computers}
■ _{Intelligent Instruments}
■ _{Portable Battery-Powered Equipment}
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 _GND SRST
SYSTEM
LOGIC
1326/2.5 TA01
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.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 4843302.
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
132625fc
1