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PDF LTC1326IS8 Data sheet ( Hoja de datos )
| Número de pieza | LTC1326IS8 | |
| Descripción | Micropower Precision Triple Supply Monitors | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
s Simultaneously Monitors Three Supplies
LTC1326: 5V, 3.3V and ADJ
LTC1326-2.5: 2.5V, 3.3V and ADJ
s Guaranteed Threshold Accuracy: ±0.75%
s Low Supply Current: 20µA
s Internal Reset Time Delay: 200ms
s Manual Push-Button Reset Input
s Active Low and Active High Reset Outputs
s Active Low “Soft” Reset Output
s Power Supply Glitch Immunity
s Guaranteed RESET for VCC3 ≥ 1V or VCC5 ≥ 1V
or VCC25 ≥ 1V
s 8-Pin SO and MSOP Packages
U
APPLICATIO S
s Desktop Computers
s Notebook Computers
s Intelligent Instruments
s Portable Battery-Powered Equipment
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
VCC3,VCC5 or VCC25 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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
DC/DC
CONVERTER
2.5V
3.3V
VCORE
0.1µF
PUSH-BUTTON
RESET
VCC25 VCC3 VCCA
LTC1326-2.5
RST
PBR SRST
GND
SYSTEM
LOGIC
1326/2.5 TA01
RST Output Voltage vs Supply Voltage (LTC1326-2.5)
3.5
VCC25 = VCCA = VCC3
3.0 4.7k PULL-UP FROM RST TO VCC3
TA = 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
VCC3 (V)
1326/2.5 TA02
1
1 page  
LTC1326/LTC1326-2.5
TYPICAL PERFOR A CE CHARACTERISTICS
VCCA Transient Immunity
40
RESET OCCURS
35 ABOVE CURVE
TA = 25°C
30
25
20
15
10
5
0
0.001
0.01
0.1
1
VCCA RESET COMPARATOR OVERDRIVE (V)
1326/2.5 G07
VCC25 Threshold Voltage
vs Temperature (LTC1326-2.5)
2.375
2.370
2.365
2.360
2.355
2.350
– 60 – 40 – 20 0 20 40 60 80 100
TEMPERATURE (°C)
1326/2.5 G10
Reset Pulse Width
vs Temperature
225
220
215
210
205
200
195
190
– 60 – 40 – 20 0 20 40 60
TEMPERATURE (°C)
80 100
1326/2.5 G13
VCC3 Transient Immunity
40
RESET OCCURS
35 ABOVE CURVE
TA = 25°C
30
25
20
15
10
5
0
0.001
0.01
0.1
1
VCC3 RESET COMPARATOR OVERDRIVE (V)
1326/2.5 G08
VCC3 Threshold Voltage
vs Temperature
3.135
3.130
3.125
3.120
3.115
3.110
3.105
3.100
– 60 – 40 – 20 0 20 40 60 80 100
TEMPERATURE (°C)
1326/2.5 G11
“Soft” Reset Pulse Width
vs Temperature
112.5
110.0
107.5
105.0
102.5
100.0
97.5
95.0
– 60 – 40 – 20 0 20 40 60 80 100
TEMPERATURE (°C)
1326/2.5 G14
VCC5 Threshold Voltage
vs Temperature (LTC1326)
4.750
4.745
4.740
4.735
4.730
4.725
4.720
4.715
4.710
4.705
4.700
– 60 – 40 – 20 0 20 40 60 80 100
TEMPERATURE (°C)
1326/2.5 G09
VCCA Threshold Voltage
vs Temperature
1.005
1.004
1.003
1.002
1.001
1.000
0.999
0.998
0.997
0.996
0.995
– 60 – 40 – 20 0 20 40 60 80 100
TEMPERATURE (°C)
1326/2.5 G12
PBR Assertion Time to Reset
vs Temperature
2.25
2.20
2.15
2.10
2.05
2.00
1.95
1.90
– 60 – 40 – 20 0 20 40 60 80 100
TEMPERATURE (°C)
1326/2.5 G15
5
5 Page 
TYPICAL APPLICATIONS N
LTC1326/LTC1326-2.5
Triple Supply Monitor (3.3V, 5V and Adjustable)
ADJUSTABLE SUPPLY
OR DC/DC FEEDBACK
DIVIDER
3.3V
5V
R1
R2
LTC1326
1
VCC3
2
VCC5
3
VCCA
4
GND
PBR
SRST
RST
RST
8
7
6
5
SYSTEM RESET
1326/2.5 TA03
Dual Supply Monitor (3.3V and 5V, Defeat VCCA Input)
LTC1326
18
3.3V VCC3 PBR
27
5V VCC5 SRST
36
VCCA RST
45
GND RST
SYSTEM RESET
1326/2.5 TA05
Dual Supply Monitor (3.3V or 5V Plus Adj)
3.3V OR
5V
ADJUSTABLE
SUPPLY
R1
R2
LTC1326
1
VCC3
2
VCC5
3
VCCA
4
GND
PBR
SRST
RST
RST
8
7
6
5
4.7k
SYSTEM RESET
REFER TO LTC1326 OVERRIDE FUNCTIONS IN
THE APPLICATIONS INFORMATION SECTION.
1326/2.5 F01
Dual Supply Monitor (3.3V Plus Adj)
3.3V
ADJUSTABLE
SUPPLY
R1
R2
LTC1326-2.5
1
VCC3
2
VCC25
3
VCCA
4
GND
PBR
SRST
RST
RST
8
7
6
5
4.7k
SYSTEM RESET
1326/2.5 TA07
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LTC1326IS8.PDF ] | |
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