LTC2901 반도체 회로 부품 판매점
Programmable Quad Supply Monitor with Adjustable Reset and Watchdog Timers
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 Linear Technology |
Final Electrical Specifications
LTC2901
Programmable Quad Supply
Monitor with Adjustable Reset
and Watchdog Timers
June 2002
FEATURES
DESCRIPTIO
s Simultaneously Monitors Four Supplies
s 16 User Selectable Combinations of 5V, 3.3V, 3V,
2.5V, 1.8V, 1.5V and/or ±Adjustable Voltage
Thresholds
s Guaranteed Threshold Accuracy: ±1.5% of
Monitored Voltage Over Temperature
s Low Supply Current: 43µA Typ
s Adjustable Reset Time
s Adjustable Watchdog Time
s Open-Drain RST Output (LTC2901-1)
s Push-Pull RST Output (LTC2901-2)
s Individual Nondelayed Monitor Output for Each Supply
s Power Supply Glitch Immunity
s Guaranteed RST for VCC ≥ 1V
U
APPLICATIO S
s Desktop and Notebook Computers
s Multivoltage Systems
s Telecom Equipment
s Portable Battery-Powered Equipment
s Network Servers
The LTC®2901 is a programmable supply monitor for
systems with up to four supply voltages. One of 16 preset
or adjustable voltage monitor combinations can be se-
lected using an external resistor divider connected to the
program pin. The preset voltage thresholds are accurate
to 1.5% over temperature. All four voltage comparator
outputs are connected to separate pins for individual
supply monitoring.
The reset and watchdog delay times are adjustable using
external capacitors. Tight voltage threshold accuracy and
glitch immunity ensure reliable reset operation without
false triggering. The RST output is guaranteed to be in the
correct state for VCC down to 1V. The LTC2901-1 features
an open-drain RST output, while the LTC2901-2 has a
push-pull RST output.
The 43µA supply current makes the LTC2901 ideal for
power conscious systems and it may be configured to
monitor less than four inputs. The parts are available in
the 16-lead narrow SSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Quadruple Supply Monitor (5V, 3.3V, 2.5V, 1.8V)
DC/DC
CONVERTER
5V
3.3V
2.5V
1.8V
C1
0.1µF
SYSTEM
LOGIC
C2
0.1µF
R1
59k
1%
R2
40.2k
1%
3 13
R3
4 V3 V4
V1
10k
2
COMP1
16
COMP2
14 LTC2901-2 1
V2 COMP3
15
COMP4
12
VREF
8
WDI
7
WDO
11
VPG
6
RST
GND CRT
CWT
10 5 CRT
9 CWT
47nF 47nF
POWER
GOOD
2901 TA01
tRST = 216ms
tWD = 940ms
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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LTC2901
ABSOLUTE AXI U RATI GS
(Notes 1, 2, 3)
V1, V2, V3, V4, VPG ..................................... – 0.3V to 7V
RST (LTC2901-1)........................................ – 0.3V to 7V
RST (LTC2901-2).......................... – 0.3V to (V2 + 0.3V)
COMPX ....................................................... – 0.3V to 7V
CWT, WDO .................................................. – 0.3V to 7V
VREF, CRT, WDI ............................ – 0.3V to (VCC + 0.3V)
Reference Load Current (IVREF) ............................ ±1mA
V4 Input Current (–ADJ Mode) ............................. –1mA
Operating Temperature Range
LTC2901-1C/LTC2901-2C ....................... 0°C to 70°C
LTC2901-1I/LTC2901-2I .................... –40°C to 85°C
Storage Temperature Range .................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................... 300°C
UW U
PACKAGE/ORDER I FOR ATIO
COMP3 1
COMP1 2
V3 3
V1 4
CRT 5
RST 6
WDO 7
WDI 8
TOP VIEW
16 COMP2
15 COMP4
14 V2
13 V4
12 VREF
11 VPG
10 GND
9 CWT
GN PACKAGE
16-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 130°C/W
ORDER PART
NUMBER
LTC2901-1CGN
LTC2901-2CGN
LTC2901-1IGN
LTC2901-2IGN
GN16 PART MARKING
29011
29012
29011I
29012I
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 5V, unless otherwise noted. (Note 3)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VRT50
VRT33
VRT30
VRT25
VRT18
VRT15
VRTA
VRTAN
VCC
VCCMINP
VCCMINC
VREF
VPG
IVPG
IV1
IV2
IV3
5V, 5% Reset Threshold
3.3V, 5% Reset Threshold
3V, 5% Reset Threshold
2.5V, 5% Reset Threshold
1.8V, 5% Reset Threshold
1.5V, 5% Reset Threshold
ADJ Reset Threshold
– ADJ Reset Threshold
Minimum Internal Operating Voltage
Minimum Required for Programming
Minimum Required for Comparators
Reference Voltage
Programming Voltage Range
VPG Input Current
V1 Input Current
V2 Input Current
V3 Input Current
V1 Input Threshold
V1, V2 Input Threshold
V2 Input Threshold
V2, V3 Input Threshold
V3, V4 Input Threshold
V3, V4 Input Threshold
V3, V4 Input Threshold
V4 Input Threshold
RST, COMPX in Correct Logic State;
VCC Rising Prior to Program
VCC Rising
VCC Falling
VCC ≥ 2.3V, IVREF = ±1mA, CREF ≤ 1000pF
VCC ≥ VCCMINP
VPG = VREF
V1 = 5V, IVREF = 12µA, (Note 4)
V2 = 3.3V
V3 = 2.5V
V3 = 0.55V (ADJ Mode)
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
q
4.600
3.036
2.760
2.300
1.656
1.380
0.492
– 18
4.675
3.086
2.805
2.338
1.683
1.403
0.500
0
4.750
3.135
2.850
2.375
1.710
1.425
0.508
18
1
1.192
0
–15
1.210
43
0.8
0.52
2.42
2.32
1.228
VREF
±20
75
2
1.2
15
V
V
V
V
V
V
V
mV
V
V
V
V
V
nA
µA
µA
µA
nA
IV4 V4 Input Current
V4 = 1.8V
V4 = 0.55V (ADJ Mode)
V4 = –0.05V (–ADJ Mode)
q 0.34 0.8
q –15
15
q –15
15
µA
nA
ICRT(UP)
ICRT(DN)
tRST
CRT Pull-Up Current
CRT Pull-Down Current
Reset Time-Out Period
VCRT = 0V
VCRT = 1.3V
CRT = 1500pF
q –1.4 –2 –2.6
q 10 20 30
q 4.9 6.9 8.9
µA
µA
ms
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전화번호 : 051-319-2877
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