LTC2906 Datasheet, PDF (1/16 Pages) Linear Technology – Precision Dual Supply Monitors with One Pin-Selectable Threshold and One Adjustable Input

LTC2906/LTC2907
Precision Dual Supply Monitors
with One Pin-Selectable Threshold
and One Adjustable Input
FEATURES
s _{Monitors Two Inputs Simultaneously}
s _{Three Threshold Selections for 5V, 3.3V or 2.5V}
Supplies
s _{Low Voltage Adjustable Input (0.5V)}
s _{Three Supply Tolerances (5%, 7.5%, 10%)}
s _{Guaranteed Threshold Accuracy: ±1.5% of}
Monitored Voltage Over Temperature
s _{Internal VCC Auto Select}
s _{Power Supply Glitch Immunity}
s _{200ms Reset Time Delay (LTC2906 Only)}
s _{Adjustable Reset Time Delay (LTC2907 Only)}
s _{Open Drain RST Output}
s _{Guaranteed RST for V1 ≥ 1V or VCC ≥ 1V}
s _{Low Profile (1mm) SOT-23 (ThinSOT}^TM_{) and}
Plastic (3mm × 2_Umm) DFN Packages
APPLICATIO S
s _{Desktop and Notebook Computers}
s _{Handheld Devices}
s _{Network Servers}
s _{Core, I/O Monitor}
, LTC and LT are registered trademarks of Linear Technology Corporation.
DESCRIPTIO
The LTC^®2906/LTC2907 are dual supply monitors in-
tended for systems with multiple supply voltages. The
dual supply monitors have a common reset output with
delay (200ms for the LTC2906 and adjustable using an
external capacitor for the LTC2907). These products pro-
vide a precise, space-conscious and micropower solution
for supply monitoring.
The LTC2906/LTC2907 feature a tight 1.5% threshold
accuracy over the whole operating temperature range
and glitch immunity to ensure reliable reset operation
without false triggering. The open drain RST output state
is guaranteed to be in the correct state for V1 and/or V_CC
down to 1V.
The LTC2906/LTC2907 also feature one adjustable input
with a nominal threshold level at 0.5V, another input with
three possible input threshold levels, and three supply
tolerances for possible margining. These features provide
versatility for any kind of system requiring dual supply
monitors. Two three-state input pins program the thresh-
old and tolerance level without requiring any external
components.
TYPICAL APPLICATIO
Dual Supply Monitor with Adjustable Tolerance (2.5V, 0.8V)
DC/DC
CONVERTER
0.1µF
TOLERANCE = 10%
2.5V
0.8V
V1
V_ADJ
LTC2907
V_CC
TMR
S1
GND
0.1µF
22nF
TOL
RST
SYSTEM
LOGIC
49.9k
100k
29067 TA01
Supply Selection Programming
V1
S1
5.0
V1
3.3
OPEN
2.5
GND
Tolerance Programming
TOLERANCE
TOL
5%
V1
7.5%
OPEN
10%
GND
29067f
1