LTC1326/LTC1326-2.5
Micropower Precision
Triple Supply Monitors
FEATURES
DESCRIPTIO
Simultaneously Monitors Three Supplies The LTC 1326/LTC1326-2.5 are triple supply monitors
LTC1326: 5V, 3.3V and ADJ intended for systems with multiple supply voltages. They
LTC1326-2.5: 2.5V, 3.3V and ADJ provide micropower operation, small size and high accu-
Guaranteed Threshold Accuracy: 0.75% racy supply monitoring.
Low Supply Current: 20A
Tight 0.75% threshold accuracy and glitch immunity
Internal Reset Time Delay: 200ms
ensure reliable reset operation without false triggering.
Manual Push-Button Reset Input
The 20A typical supply current makes the LTC1326/
Active Low and Active High Reset Outputs
LTC1326-2.5 ideal for power-conscious systems.
Active Low Soft Reset Output
The RST output is guaranteed to be in the correct state for
Power Supply Glitch Immunity
V ,V or V down to 1V. The LTC1326/LTC1326-2.5
Guaranteed RESET for V 1V or V 1V
CC3 CC5 CC25
CC3 CC5
can be configured to monitor one, two or three inputs,
or V 1V
CC25
depending on system requirements.
8-Pin SO and MSOP Packages
A manual push-button reset input provides the ability to
U
generate a very narrow soft reset pulse (100s typ) or a
APPLICATIO S
200ms reset pulse equivalent to a power-on reset. Both
SRST and RST outputs are open-drain and can be OR-tied
Desktop Computers
Notebook Computers with other reset sources.
Intelligent Instruments , LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Portable Battery-Powered Equipment
Protected by U.S. Patents, including 4843302.
TYPICAL APPLICATIO
RST Output Voltage vs Supply Voltage (LTC1326-2.5)
2.5V
3.5
3.3V V = V = V
DC/DC SYSTEM
CC25 CCA CC3
CONVERTER LOGIC
V 3.0 4.7k PULL-UP FROM RST TO V
CORE
CC3
T = 25C
A
2.5
0.1F
2.0
1.5
V V V
CC25 CC3 CCA
1.0
LTC1326-2.5
0.5
RST
0
PBR SRST
GND 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
PUSH-BUTTON
V (V)
CC3
RESET
1326/2.5 TA02
1326/2.5 TA01
132625fc
1
RST OUTPUT VOLTAGE (V)
U
ULTC1326/LTC1326-2.5
(Notes 1, 2)
ABSOLUTEXAI U RATI GS
Terminal Voltage
Operating Temperature Range
V , V , V , V ......................... 0.5V to 7V
CC3 CC5 CC25 CCA
LTC1326C/LTC1326C-2.5....................... 0C to 70C
RST, SRST ............................................ 0.5V to 7V
LTC1326I/LTC1326I-2.5 ..................... 40C to 85C
RST ...................................... 0.5V to (V + 0.3V)
CC3
Storage Temperature Range ................ 65C to 150C
PBR .......................................................... 7V to 7V
Lead Temperature (Soldering, 10 sec)................. 300C
/
PACKAGE ORDER I FOR ATIO
TOP VIEW
TOP VIEW
V 1 8 PBR
CC3
V 1 8 PBR
CC3
V 2 7 SRST
V 2 7 SRST CC5
CC5
V 3 6 RST
CCA
V 3 6 RST
CCA
GND 4 5 RST
GND 4 5 RST
MS8 PACKAGE
8-LEAD PLASTIC MSOP
S8 PACKAGE
T = 125C, = 250C/W
JMAX JA
8-LEAD PLASTIC SO
T = 125C, = 150C/W
JMAX JA
ORDER PART NUMBER MS8 PART NUMBER ORDER PART NUMBER S8 PART NUMBER
LTBA LTC1326CS8 1326
LTC1326CMS8
LTUH LTC1326IS8 1326I
LTC1326IMS8
TOP VIEW
TOP VIEW
V 1 8 PBR
CC3
V 1 8 PBR
CC3
V 2 7 SRST
V 2 7 SRST CC25
CC25
V 3 6 RST
CCA
V 3 6 RST
CCA
GND 4 5 RST
GND 4 5 RST
MS8 PACKAGE
8-LEAD PLASTIC MSOP
S8 PACKAGE
T = 125C, = 250C/W
JMAX JA
8-LEAD PLASTIC SO
T = 125C, = 150C/W
JMAX JA
ORDER PART NUMBER MS8 PART NUMBER ORDER PART NUMBER S8 PART NUMBER
LTC1326CMS8-2.5 LTEK LTC1326CS8-2.5 132625
LTC1326IMS8-2.5 LTUJ LTC1326IS8-2.5 326I25
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: