LTC1326-2.5 Linear Technology, LTC1326-2.5 Datasheet

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LTC1326-2.5

Manufacturer Part Number
LTC1326-2.5
Description
Micropower Precision Triple Supply Monitors
Manufacturer
Linear Technology
Datasheet
FEATURES
APPLICATIO S
TYPICAL APPLICATIO
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: 20 A
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
or V
8-Pin SO and MSOP Packages
Desktop Computers
Notebook Computers
Intelligent Instruments
Portable Battery-Powered Equipment
PUSH-BUTTON
CC25
CONVERTER
RESET
DC/DC
1V
V
PBR
CC25
U
LTC1326-2.5
V
GND
CC3
V
SRST
CC3
RST
2.5V
3.3V
V
CCA
CORE
0.1 F
1V or V
U
CC5
1326/2.5 TA01
SYSTEM
LOGIC
1V
DESCRIPTIO
The LTC
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 20 A 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
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 (100 s 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.
CC3
, LTC and LT are registered trademarks of Linear Technology Corporation.
, V
RST Output Voltage vs Supply Voltage (LTC1326-2.5)
CC5
®
1326/LTC1326-2.5 are triple supply monitors
or V
Micropower Precision
Triple Supply Monitors
3.5
3.0
2.0
1.5
1.0
2.5
0.5
0
CC25
0
V
4.7k PULL-UP FROM RST TO V
T
LTC1326/LTC1326-2.5
CC25
A
0.5
= 25 C
down to 1V. The LTC1326/LTC1326-2.5
U
= V
1.0
CCA
= V
1.5
V
CC3
CC3
2.0
(V)
2.5
CC3
1326/2.5 TA02
3.0
3.5
1

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LTC1326-2.5 Summary of contents

Page 1

... 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. RST Output Voltage vs Supply Voltage (LTC1326-2.5) 3.5 SYSTEM LOGIC 3.0 2 ...

Page 2

... JMAX ORDER PART NUMBER V 1 CC3 V 2 LTC1326CMS8-2.5 CC25 V 3 CCA GND 4 MS8 PART MARKING 8-LEAD PLASTIC SO LTEK T JMAX = 2.5V (for LTC1326-2.5 CCA CC3 CONDITIONS – – – ...

Page 3

... RST Output Voltage High (Note 3) OH SRST Output Voltage High (Note 3) RST Output Voltage High t Prop Delay RST to RST PHL High Input to Low Output t Prop Delay RST to RST PLH Low Input to High Output = 2.5V (for LTC1326-2.5 CCA CC3 CONDITIONS CC5 V = 2.5V CC25 ...

Page 4

... I vs Temperature VCC25 (LTC1326-2.5) 3.00 2.95 2.90 2.85 2.80 2.75 2.70 2.65 2.60 2.55 2.50 100 – 60 – 40 – TEMPERATURE ( C) V Transient Immunity CC25 (LTC1326-2.5) 45 RESET OCCURS 40 ABOVE CURVE 0.001 0.01 0.1 V RESET COMPARATOR OVERDRIVE (V) CC25 UNITS V 80 100 1326/2.5 G03 1 1326/2 ...

Page 5

... ABOVE CURVE 0.001 0.01 0.1 V RESET COMPARATOR OVERDRIVE (V) CCA 1326/2.5 G07 V Threshold Voltage CC25 vs Temperature (LTC1326-2.5) 2.375 2.370 2.365 2.360 2.355 2.350 – – 40 – TEMPERATURE ( C) 1326/2.5 G10 Reset Pulse Width vs Temperature 225 220 215 ...

Page 6

... If unused, it can be tied to CC5 V (see Dual and Single Supply Monitor Operation in CC3 the Applications Information section). V (Pin 2) (LTC1326-2.5): 2.5V Sense Input. Used as CC25 gate drive for RST output FET when the voltage less than the voltage unused it can be tied CC25 to V ...

Page 7

... RESET + GENERATOR – + REF LTC1326-2.5 SOFT RESET PBR TIMER RESET TO POWER DETECT – 200ms RESET GENERATOR + – + – + REF LTC1326/LTC1326-2.5 V CC3 SRST V CC3 V CC3 RST POWER DETECT/ GATE DRIVE V CC5 V CC3 5 RST 1326 BD V CC3 SRST ...

Page 8

... V their thresholds. On power-down, once any of the V its threshold, RST is held at a logic low. A logic low of 0.4V is guaranteed until V and V on the LTC1326 or V CC3 CC5 and V on the LTC1326-2.5 drop below 1V. CC25 8 PBR t < RST RST 1326/2.5 TD01 SRST ...

Page 9

... V inputs may be individually CC3 CC5 CCA disabled by the following override techniques which allow the LTC1326 or LTC1326-2 used as a dual or single supply monitor. LTC1326 Override Functions The V pin, if unused, can be tied to either V CCA This is an obvious solution since the trip points for V ...

Page 10

... V (V) CC5 Figure 4. RST Output Voltage Characteristics of the Circuit in Figure LTC1326-2.5 Override Functions The V pin, if unused, can be tied to either V CCA This is an obvious solution since the trip points for V and V CC25 V . Likewise, the V CCA V must always be used. Tying V ...

Page 11

... THE APPLICATIONS INFORMATION SECTION. Dual Supply Monitor (3.3V Plus Adj) 3.3V LTC1326-2 PBR CC3 2 V SRST CC25 R1 3 ADJUSTABLE V RST CCA SUPPLY 4 R2 GND RST LTC1326/LTC1326-2 SYSTEM RESET 5 1326/2.5 TA03 Input) CCA 1326/2.5 TA05 4.7k SYSTEM RESET 1326/2.5 F01 8 4. SYSTEM RESET 5 1326/2.5 TA07 11 ...

Page 12

... V PBR V CC3 OSENSE 2 2. SRST CC5 RST CCA 4 22.1k GND RST ADJUSTABLE 1% RESET TRIP 1326/2.5 TA09 to Initiate Hard Reset LTC1326-2 3.3V V PBR CC3 2 7 2.5V V SRST CC25 RST RESET CCA 4 5 GND RST PBR 20ms RST 200ms 1326/2.5 TA11 4.7k RESET 1326/2 ...

Page 13

... TRIP 1% Q3 SUPPLY V TRIP R4 – 5V – 4.6V 392k – 3.3V – – 12V – 10.8V Reset Valid for V Down to 0V CC3 8 100k SYSTEM RESET 1326/2.5 TA13 LTC1326/LTC1326-2.5 8 PBR 7 SRST 6 RST SYSTEM RESET 5 RST + 0.55)(–1) R4 392k 237k 1M 1326/2.5 TA12 3 CC3 CC25 CCA 3.0 T ...

Page 14

... LTC1326/LTC1326-2.5 PACKAGE DESCRIPTIO 0.007 (0.18) * DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ...

Page 15

... TYP 0.014 – 0.019 (0.355 – 0.483) LTC1326/LTC1326-2 0.150 – 0.157** (3.810 – 3.988 0.004 – 0.010 (0.101 – 0.254) 0.050 (1 ...

Page 16

... LTC1326/LTC1326-2.5 U TYPICAL APPLICATIO Triple Supply Monitor with 3.3V and 5V System Resets ADJUSTABLE SUPPLY OR DC/DC FEEDBACK RELATED PARTS PART NUMBER DESCRIPTION LTC690 5V Supply Monitor, Watchdog Timer and Battery Backup LTC694-3.3 3.3V Supply Monitor, Watchdog Timer and Battery Backup LTC699 5V Supply Monitor and Watchdog Timer LTC1232 ...

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