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LTC1326IMS8#PBF

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LTC1326/LTC1326-2.5
132625fc
TYPICAL APPLICATIO
U
APPLICATIO S
U
FEATURES
DESCRIPTIO
U
Micropower Precision
Triple Supply Monitors
RST Output Voltage vs Supply Voltage (LTC1326-2.5)
■
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 V
CC3
≥ 1V or V
CC5
≥ 1V
or V
CC25
≥ 1V
■
8-Pin SO and MSOP Packages
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.
■
Desktop Computers
■
Notebook Computers
■
Intelligent Instruments
■
Portable Battery-Powered Equipment
V
CC3
(V)
0
2.0
2.5
3.5
1.5 2.5
1326/2.5 TA02
1.5
1.0
0.5 1.0
2.0 3.0 3.5
0.5
0
3.0
RST OUTPUT VOLTAGE (V)
V
CC25
= V
CCA
= V
CC3
4.7k PULL-UP FROM RST TO V
CC3
T
A
= 25°C
PUSH-BUTTON
RESET
1326/2.5 TA01
V
CC3
V
CC25
0.1µF
V
CCA
GND
RST
PBR
SRST
LTC1326-2.5
V
CORE
3.3V
2.5V
DC/DC
CONVERTER
SYSTEM
LOGIC
, 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.
2
LTC1326/LTC1326-2.5
132625fc
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
Terminal Voltage
V
CC3
, V
CC5
, V
CC25
, V
CCA
......................... – 0.5V to 7V
RST, SRST ............................................ – 0.5V to 7V
RST ...................................... –0.5V to (V
CC3
+ 0.3V)
PBR .......................................................... –7V to 7V
Operating Temperature Range
LTC1326C/LTC1326C-2.5....................... 0°C to 70°C
LTC1326I/LTC1326I-2.5 ..................... – 40°C to 85°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
WU
U
PACKAGE
/
O
RDER I FOR ATIO
ORDER PART NUMBER
1326
1326I
LTBA
LTUH
LTC1326CS8
LTC1326IS8
LTC1326CMS8
LTC1326IMS8
MS8 PART NUMBER
LTC1326CS8-2.5
LTC1326IS8-2.5
LTC1326CMS8-2.5
LTC1326IMS8-2.5
132625
326I25
LTEK
LTUJ
Consult factory for parts specified with wider operating temperature ranges.
1
2
3
4
8
7
6
5
TOP VIEW
S8 PACKAGE
8-LEAD PLASTIC SO
V
CC3
V
CC5
V
CCA
GND
PBR
SRST
RST
RST
T
JMAX
= 125°C, θ
JA
= 150°C/W
1
2
3
4
V
CC3
V
CC5
V
CCA
GND
8
7
6
5
PBR
SRST
RST
RST
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 125°C, θ
JA
= 250°C/W
1
2
3
4
8
7
6
5
TOP VIEW
S8 PACKAGE
8-LEAD PLASTIC SO
V
CC3
V
CC25
V
CCA
GND
PBR
SRST
RST
RST
T
JMAX
= 125°C, θ
JA
= 150°C/W
1
2
3
4
V
CC3
V
CC25
V
CCA
GND
8
7
6
5
PBR
SRST
RST
RST
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
T
JMAX
= 125°C, θ
JA
= 250°C/W
ORDER PART NUMBER S8 PART NUMBER
ORDER PART NUMBER
MS8 PART NUMBER ORDER PART NUMBER S8 PART NUMBER
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
(Notes 1, 2)
3
LTC1326/LTC1326-2.5
132625fc
V
RT3
Reset Threshold V
CC3
0°C ≤ T
A
≤ 70°C ● 3.094 3.118 3.135 V
–40°C ≤ T
A
≤ 85°C ● 3.052 3.118 3.143 V
V
RT5
Reset Threshold V
CC5
(LTC1326) 0°C ≤ T
A
≤ 70°C ● 4.687 4.725 4.750 V
–40°C ≤ T
A
≤ 85°C ● 4.625 4.725 4.762 V
V
RT25
Reset Threshold V
CC25
(LTC1326-2.5) 0°C ≤ T
A
≤ 70°C ● 2.344 2.363 2.375 V
–40°C ≤ T
A
≤ 85°C ● 2.312 2.363 2.381 V
V
RTA
Reset Threshold V
CCA
0°C ≤ T
A
≤ 70°C ● 0.992 1.000 1.007 V
–40°C ≤ T
A
≤ 85°C ● 0.980 1.000 1.007 V
V
CC
V
CC3
Operating Voltage RST in Correct Logic State ● 17V
I
VCC3
V
CC3
Supply Current PBR = V
CC3
● 20 40 µA
I
VCC5
V
CC5
Input Current (LTC1326) V
CC5
= 5V ● 410 µA
I
VCC25
V
CC25
Input Current (LTC1326-2.5) V
CC25
= 2.5V ● 2.8 7 µA
I
VCCA
V
CCA
Input Current V
CCA
= 1V ● –15 0 15 nA
t
RST
Reset Pulse Width RST Low with 10kΩ Pull-Up to V
CC3
0°C ≤ T
A
≤ 70°C ● 140 200 280 ms
–40°C ≤ T
A
≤ 85°C ● 140 200 300 ms
t
SRST
Soft Reset Pulse Width SRST Low with 10kΩ Pull-Up to V
CC3
● 50 100 200 µs
t
UV
V
CC
Undervoltage Detect to RST V
CC25
, V
CC3
or V
CCA
Less Than Reset 13 µs
Threshold V
RT
by More Than 1%
I
PBR
PBR Pull-Up Current PBR = 0V
0°C ≤ T
A
≤ 70°C ● 3710 µA
–40°C ≤ T
A
≤ 85°C ● 3715 µA
V
IL
PBR, RST Input Low Voltage ● 0.8 V
V
IH
PBR, RST Input High Voltage ● 2V
t
PW
PBR Min Pulse Width ● 40 ns
t
DB
PBR Debounce Deassertion of PBR Input to SRST ● 20 35 ms
Output (PBR Pulse Width = 1µs)
t
PB
PBR Assertion Time for Transition PBR Held Less Than V
IL
from Soft to Hard Reset Mode 0°C ≤ T
A
≤ 70°C ● 1.4 2.0 2.8 s
–40°C ≤ T
A
≤ 85°C ● 1.4 2.0 3.0 s
V
OL
RST Output Voltage Low I
SINK
= 5mA ● 0.15 0.4 V
I
SINK
= 100µA, V
CC3
= 1V, V
CC5
= 0V ● 0.05 0.4 V
0°C ≤ T
A
≤ 70°CV
CC3
= 0V, V
CC5
= 1V ● 0.05 0.4 V
V
CC3
= 1V, V
CC5
= 1V ● 0.05 0.4 V
I
SINK
= 100µA, V
CC3
= 1.1V, V
CC5
= 0V ● 0.05 0.4 V
–40°C ≤ T
A
≤ 85°CV
CC3
= 0V, V
CC5
= 1.1V ● 0.05 0.4 V
V
CC3
= 1.1V, V
CC5
= 1.1V ● 0.05 0.4 V
I
SINK
= 100µA, V
CC3
= 1V, V
CC25
= 0V ● 0.05 0.4 V
0°C ≤ T
A
≤ 70°CV
CC3
= 0V, V
CC25
= 1V ● 0.05 0.4 V
V
CC3
= 1V, V
CC25
= 1V ● 0.05 0.4 V
I
SINK
= 100µA, V
CC3
= 1.1V, V
CC25
= 0V ● 0.05 0.4 V
–40°C ≤ T
A
≤ 85°CV
CC3
= 0V, V
CC25
= 1.1V ● 0.05 0.4 V
V
CC3
= 1.1V, V
CC25
= 1.1V ● 0.05 0.4 V
SRST Output Voltage Low I
SINK
= 2.5mA ● 0.15 0.4 V
RST Output Voltage Low I
SINK
= 2.5mA ● 0.15 0.4 V
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC3
= 3.3V, V
CC5
= 5V (for LTC1326),V
CC25
= 2.5V (for LTC1326-2.5),
V
CCA
= V
CC3
, T
A
= 25°C unless otherwise noted.
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LTC1326IMS8#PBF

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Manufacturer:
Analog Devices Inc.
Description:
Supervisory Circuits uP Precision Triple Supply Monitor
Lifecycle:
New from this manufacturer.
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