C-Grade ................................................... 0°C to 70°C
I-Grade.................................................–40°C to 85°C
H-Grade ............................................. –40°C to 125°C
Storage Temperature Range ......................–65 to 150°C
PIN CONFIGURATION
LTC2962
LTC2963
TOP VIEW
V1
V2
V3
V4
20 19 18 17
RDIS
1
16 REF
15 PG1
21
14 PG2
13 PG3
12 PG4
11 RT
7
WD0
8
WDI
9 10
WDS
WT
RDIS
1
MR
2
DV
CC
3
V
CC
4
RST
5
GND 6
7
OUT1
8
OUT2
9 10
OUT3
OUT4
21
LTC2964
TOP VIEW
V1
V2
V3
20 19 18 17
16 REF
15 PG1
14 PG2
13 PG3
12 PG4
11 RT
V4
TOP VIEW
V1
V2
V3
16 15 14 13
RDIS
1
MR
2
DV
CC
3
V
CC
4
5
RST
6
GND
7
RT
8
PG4
17
12 REF
11 PG1
10 PG2
9 PG3
V4
MR
2
DV
CC
3
V
CC
4
RST
5
GND 6
UD PACKAGE
16-LEAD (3mm
×
3mm) PLASTIC QFN
T
JMAX
= 125°C,
JA
= 68°C/W,
JC
= 7.5°C/W
EXPOSED PAD (PIN 17) PCB GND CONNECTION OPTIONAL
UDC PACKAGE
20-LEAD (3mm
×
4mm) PLASTIC QFN
T
JMAX
= 125°C,
JA
= 52°C/W,
JC
= 6.8°C/W
EXPOSED PAD (PIN 21) PCB GND CONNECTION OPTIONAL
UDC PACKAGE
20-LEAD (3mm
×
4mm) PLASTIC QFN
T
JMAX
= 125°C,
JA
= 52°C/W,
JC
= 6.8°C/W
EXPOSED PAD (PIN 21) PCB GND CONNECTION OPTIONAL
ORDER INFORMATION
TUBE
LTC2962CUD#PBF
LTC2962IUD#PBF
LTC2962HUD#PBF
LTC2963CUDC-1#PBF
LTC2963IUDC-1#PBF
LTC2963HUDC-1#PBF
LTC2964CUDC#PBF
LTC2964IUDC#PBF
LTC2964HUDC#PBF
TAPE AND REEL
LTC2962CUD#TRPBF
LTC2962IUD#TRPBF
LTC2962HUD#TRPBF
LTC2963CUDC-1#TRPBF
LTC2963IUDC-1#TRPBF
LTC2963HUDC-1#TRPBF
LTC2964CUDC#TRPBF
LTC2964IUDC#TRPBF
LTC2964HUDC#TRPBF
PART MARKING*
LGZZ
LGZZ
LGZZ
LHBC
LHBC
LHBC
LHBB
LHBB
LHBB
PACKAGE DESCRIPTION
16-Lead (3mm × 3mm) Plastic QFN
16-Lead (3mm × 3mm) Plastic QFN
16-Lead (3mm × 3mm) Plastic QFN
20-Lead (3mm × 4mm) Plastic QFN
20-Lead (3mm × 4mm) Plastic QFN
20-Lead (3mm × 4mm) Plastic QFN
20-Lead (3mm × 4mm) Plastic QFN
20-Lead (3mm × 4mm) Plastic QFN
20-Lead (3mm × 4mm) Plastic QFN
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Tape and reel specifications.
Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
Rev 0
2
For more information
www.analog.com
LTC2962/LTC2963/LTC2964
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 3.3V, DV
CC
= 0V,
MR
=
RDIS
= V
CC
, unless otherwise specified.
(Note 2)
SYMBOL PARAMETER
V
CC
Operating Range
Guaranteed
RST
Output Low
V
CCMINC
I
VCC
Minimum Required for Configuration
V
CC
Input Supply Current
DV
CC
Operating Range
DV
CC
Input Supply Current
V
RT50
V
RT33
V
RT25
V
RT18
V
RT15
V
RT12
V
RT10
V
RTA
V
REF
V
PG
I
MON
R
MON
t
UV
5V, –4% Reset Threshold
5V, –6% Reset Threshold
3.3V, –4% Reset Threshold
3.3V, –6% Reset Threshold
2.5V, –4% Reset Threshold
2.5V, –6% Reset Threshold
1.8V, –4% Reset Threshold
1.8V, –6% Reset Threshold
1.5V, –4% Reset Threshold
1.5V, –6% Reset Threshold
1.2V, –4% Reset Threshold
1.2V, –6% Reset Threshold
1.0V, –4% Reset Threshold
1.0V, –6% Reset Threshold
±ADJ Reset Threshold
Reference Voltage
PG1 to PG4 Configuration Voltage Range
Monitor Input Current for V1 - V4
Monitor Input Resistance for V1 - V4
Comparator Propagation Delay to
RST
or OUTn Falling Edge
RT and WT Pull-Up Current
RT and WT Pull-Down Current
t
RST
Reset Timeout Period
Internal Timer Select Level (WT and RT)
V
CC
-Detect Current in Internal Timer Mode (WT and RT) V = V
CC
LTC2963 Watchdog
t
WDU
t
WD(INIT)
V
WDS
Watchdog Upper Timeout Period
Initial Watchdog Timeout Period
C
WT
= 1500pF
WT Tied to V
CC
WDS = Logic Low
WDS = Open
WDS = Logic High
Logic Low
Open
Logic High
l
l
l
l
l
l
l
l
ELECTRICAL CHARACTERISTICS
CONDITIONS
l
MIN
2.25
l
l
l
l
TYP
MAX
5.5
1
2.2
UNITS
V
V
V
µA
V
nA
V
V
V
V
V
V
V
V
V
V
V
V
V
V
mV
V
V
nA
MΩ
µs
µA
µA
ms
ms
V
µA
ms
s
V
CC
Rising
V
CC
Rising
80
1.6
140
25
210
5.5
500
4.825
4.725
3.185
3.119
2.413
2.363
1.737
1.701
1.448
1.418
1.158
1.134
0.965
0.945
502.5
1.207
V
REF
±15
I
RST
= 0, I
WDO
= 0
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
4.775
4.675
3.152
3.087
2.388
2.338
1.719
1.683
1.433
1.403
1.146
1.122
0.955
0.935
497.5
1.183
0
0.8
4.8
4.7
3.168
3.102
2.4
2.35
1.728
1.692
1.44
1.41
1.152
1.128
0.96
0.94
500
1.195
V
CC
= 2.25V to 5.5V, I
REF
= ±1mA,
l
C
REF
≤ 1000pF
V
CC
> V
CCMINC
±ADJ Modes (Vn = 0.5V)
All Modes Except ±ADJ
Overdrive = 10%
V = GND
V = 1.3V
C
RT
= 1500pF
V
RT
= V
CC
l
l
l
l
l
l
l
l
l
1.2
20
1.6
40
–2.5
2.5
24
240
2
200
2
–1.5
1.5
12
160
V
CC
– 0.1
–2
2
18
200
1
100
1.3
150
1.6
t
WDU
8 • t
WDU
64 • t
WDU
WDS Input Level
(V
CC
= 2.25 to 5.5V)
0.7
V
CC
– 0.3
1.3
0.4
V
CC
– 0.7
V
V
V
Rev 0
For more information
www.analog.com
3
LTC2962/LTC2963/LTC2964
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 3.3V, DV
CC
= 0V,
MR
=
RDIS
= V
CC
, unless otherwise specified.
(Note 2)
I
WDS
I
WDS(HZ)
t
WDI,MAX
t
WP
t
WD
Logic I/O
V
OL
Voltage Output Low
RST, WDO
(Note 3)
RST
Only
Voltage Output Low OUTn (LTC2964, Note 4)
V
OH
I
OH
I
OPU
V
IL
V
IH
I
IL
t
MP
t
MD
Voltage Output High
RST, WDO
(Note 3)
Voltage Output High, OUTn (LTC2964, Note 4)
RST, WDO
Output Voltage High Leakage
RST, WDO
and OUTn Internal Pull-Up Current
RDIS, MR
and
WDI
Input Level Low
RDIS, MR
and
WDI
Input Level High
RDIS, MR
and
WDI
Internal Pull-up Current
MR
Input Pulse Width
MR
Input Propagation Delay
MR
Falling to
RST
Falling
I
SINK
= 3mA, V
CC
= 2.25V to 5.5V
I
SINK
= 100µA, V
CC
= 1.1V
I
SINK
= 5mA, V
CC
= 2.25V to 5.5V
I
SOURCE
= –200µA; DV
CC
= 3.3V
I
SOURCE
= –1µA
V = 5.5V, V
CC
= 5.5V or
V
CC
= GND
V = GND
V
CC
= 2.25 to 5.5V
V
CC
= 2.25 to 5.5V
V = GND
l
l
l
l
l
l
l
l
l
l
l
l
ELECTRICAL CHARACTERISTICS
WDS Input Current
Allowable WDS Leakage in Open State
Rise/Fall Time of WDI Edge
WDI Input Pulse Width
WDI to WDO Propagation Delay
V
WDS
= GND
V
WDS
= V
CC
l
l
l
–4
–2.6
2.6
4
±1
2
µA
µA
µA
µs
µs
µs
mV
mV
mV
V
V
V
CC
= 2.25V to 5.5V
l
l
2
0.5
40
10
50
0.7 • DV
CC
V
CC
– 1
100
–4
0.4
1.6
–16
150
0.1
1
–10
–4
–6
-10
150
60
300
nA
µA
V
V
µA
ns
µs
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
All currents into pins are positive; all voltages are referenced to
GND unless otherwise noted.
Note 3:
The
RST
and
WDO
pins are push-pull outputs that swing to DV
CC
when DV
CC
is greater than 1.6V.
Note 4:
The output pins, OUT1 - OUT4, have internal pull-ups to V
CC
of
typically 6µA. However, external pull-up resistors may be used when faster
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