MAX6364HUT44 [MAXIM]
SOT23, Low-Power レP Supervisory Circuits with Battery Backup; SOT23封装，低功耗レP监控电路，带有备用电池
| 型号： | MAX6364HUT44 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | SOT23, Low-Power レP Supervisory Circuits with Battery Backup |
| 文件： | 总8页 (文件大小：105K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1615; Rev 0; 1/00
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
General Description
Features
The MAX6361/MAX6363/MAX6364 supervisory circuits
reduce the complexity and number of components
required for power-supply monitoring and battery control
functions in microprocessor (µP) systems. The circuits sig-
nificantly improve system reliability and accuracy com-
pared to that obtainable with separate ICs or discrete
components. Their functions include µP reset, backup-
battery switchover, and power failure warning.
ꢀ Low +1.2V Operating Supply Voltage
(V
CC
or V
)
BATT
ꢀ Precision Monitoring of +5.0V, +3.3V, +3.0V, and
+2.5V Power-Supply Voltages
ꢀ Debounced Manual Reset Input (MAX6361)
ꢀ Battery-On Output Indicator (MAX6363)
ꢀ Auxiliary User-Adjustable RESET IN (MAX6364)
ꢀ Three Available Output Structures
Push-Pull RESET, Open-Drain RESET,
Push-Pull RESET
ꢀ RESET/RESET Valid Down to 1.2V Guaranteed
The MAX6361/MAX6363/MAX6364 operate from supply
voltages as low as +1.2V. The factory preset reset
threshold voltage ranges from 2.32V to 4.63V (see
Ordering Information). These devices provide a manual
reset input (MAX6361), battery-on output (MAX6363),
and an auxiliary adjustable reset input (MAX6364). In
addition, each part type is offered in three reset output
versions: an active-low push-pull reset, an active-low
open-drain reset, and an active-high push-pull reset
(see Selector Guide at end of data sheet).
(V
CC
or V
)
BATT
ꢀ Power-Supply Transient Immunity
ꢀ 150ms (min) Reset Timeout Period
ꢀ Small 6-Pin SOT23 Package
Ordering Information
Applications
Computers
Fax Machines
PART
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
MAX6361LUT_ _-T
MAX6361PUT_ _-T
MAX6361HUT_ _-T
MAX6363LUT_ _-T
MAX6363PUT_ _-T
MAX6363HUT_ _-T
MAX6364LUT_ _-T
MAX6364PUT_ _-T
MAX6364HUT_ _-T
Controllers
Industrial Control
POS Equipment
Intelligent Instruments
Critical µP/µC
Power Monitoring
Portable/Battery-Powered
Equipment
Pin Configurations
TOP VIEW
Note: These parts offer a choice of reset threshold voltages.
From Table 1, select the suffix corresponding to the desired
threshold voltage and insert it into the part number to complete
it. When ordering from the factory, there is a 2500-piece mini-
mum on the SOT package (tape-and-reel only).
RESET, RESET
1
2
3
6
5
4
BATT
OUT
MAX6361
GND
MR
V
CC
SOT23-6
Pin Configurations continued at end of data sheet.
Selector Guide appears at end of data sheet.
Typical Operating Circuit appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
ABSOLUTE MAXIMUM RATINGS
Terminal Voltages (with respect to GND)
Output Current
V
CC
, BATT, OUT...................................................-0.3V to +6V
OUT................................Short-Circuit Protection for up to 10s
RESET (open drain)..............................................-0.3V to +6V
RESET, RESET, BATT ON ..............................................20mA
Continuous Power Dissipation (T = +70°C)
A
6-Pin SOT23 (derate 8.70mW/°C above +70°C) .........696mW
Operating Temperature Range
BATT ON, MR, RESET IN .....................-0.3V to (V
RESET, RESET......................................-0.3V to (V
Input Current
+ 0.3V)
+ 0.3V)
OUT
OUT
MAX636_ .........................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
V
V
Peak ............................................................................1A
Continuous ............................................................250mA
CC
CC
BATT Peak ....................................................................250mA
BATT Continuous ............................................................40mA
GND ................................................................................75mA
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
= +2.4V to +5.5V, V
= 3V, T = -40°C to +85°C, reset not asserted, typical values are at T = +25°C, unless otherwise
CC
BATT
A
A
noted.) (Note 1)
PARAMETER
Operating Voltage Range,
or V
SYMBOL
CONDITIONS
No load (Note 2)
MIN
TYP
MAX
UNITS
V
CC
,
0
5.5
V
V
CC
V
BATT
BATT
V
CC
V
CC
V
CC
= 2.8V
= 3.6V
= 5.5V
10
11
15
30
35
Supply Current
(excluding I
I
No load, V
> V
TH
µA
CC
CC
)
OUT
50
T
T
T
T
= +25°C
1
A
A
A
A
I
in Battery-Backup
V
= 2.8V,
BATT
SUPPLY
I
µA
µA
SUPPLY
Mode (excluding I
)
V
CC
= 0
OUT
= -40°C to +85°C
= +25°C
3
-0.1
-1.0
0.02
0.02
1.25
2.25
4.6
5.5V > V
(V
>
CC
BATT Standby Current
I
BATT
+ 0.2V)
BATT
= -40°C to +85°C
V
CC
V
CC
V
CC
= 4.75V, I
= 3.15V, I
= 2.38V, I
≤ 150mA
≤ 65mA
≤ 25mA
≤ 20mA
≤ 10mA
OUT
OUT
OUT
V
to OUT On-Resistance
R
ON
Ω
CC
V
= 4.5V, I
V
- 0.2
BATT
BATT
BATT
OUT
OUT
BATT
V
in Battery-Backup Mode
V
= 3.0V, I
V
- 0.15
- 0.15
V
OUT
BATT
BATT
V
V
= 2.25V, I
≤ 5mA
OUT
V
Power-up
Power-down
20
Battery-Switchover Threshold
(V - V
< V
mV
CC
TH
)
BATT
CC
-20
MAX636_UT46
MAX636_UT44
MAX636_UT31
MAX636_UT29
MAX636_UT26
MAX636_UT23
4.50
4.25
3.00
2.85
2.55
2.25
4.63
4.38
3.08
2.93
2.63
2.32
35
4.75
4.50
3.15
3.00
2.70
2.38
Reset Threshold
V
TH
V
V
CC
Falling Reset Delay
V
CC
falling at 10V/ms
µs
Reset-Active Timeout Period
t
RP
150
280
ms
2
_______________________________________________________________________________________
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
ELECTRICAL CHARACTERISTICS (continued)
(V
= +2.4V to +5.5V, V
= 3V, T = -40°C to +85°C, reset not asserted, typical values are at T = +25°C, unless otherwise
CC
BATT
A
A
noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
I
V
= 1.6mA,
≥ 2.1V
SINK
CC
0.3
Reset asserted,
= 0
V
OL
V
BATT
I
V
= 100µA,
≥ 1.2V
SINK
CC
0.4
V
RESET Output Voltage
Reset not asserted
(MAX636_L only)
I
V
= 500µA,
≥ V
TH(MAX)
SOURCE
CC
V
0.8 · V
OH
OH
CC
I
V
= 200µA,
SOURCE
0.7 · V
0.8 · V
CC
≥ 1.2V
CC
Reset asserted,
V
V
BATT
= 0
I
= 1mA,
≥ 1.8V
SOURCE
RESET Output Voltage
V
CC
V
CC
I
V
= 1.6mA,
SINK
CC
V
I
Reset not asserted
MAX636_P only
0.3
1
OL
≥ V
TH(MAX)
µA
RESET Output Leakage Current
LK
MANUAL RESET (MAX6361 only)
V
V
0.3 · V
IL
CC
MR Input Voltage
V
IH
0.7 · V
CC
Pull-Up Resistance
Minimum Pulse Width
Glitch Immunity
20
kΩ
µs
ns
ns
1
V
V
= 3.3V
= 3.3V
100
120
CC
MR to Reset Delay
BATT ON (MAX6363 only)
Output Voltage
CC
V
OL
I
= 3.2mA, V = 2.1V
BATT
0.4
V
SINK
Sink current, V
= 5V
60
30
mA
µA
CC
Output Short-Circuit Current
Source current, V
≥ 2V
10
100
BATT
RESET IN (MAX6364 only)
Input Threshold
1.185
1.235 1.285
V
RESET IN Leakage Current
RESET IN to Reset Delay
0.01
1.5
25
nA
µs
Overdrive voltage = 50mV, RESET IN falling
Note 1: Overtemperature limits are guaranteed by design and not production tested.
Note 2: V can be 0 anytime or V can go down to 0 if V is active (except at startup).
BATT
CC
BATT
_______________________________________________________________________________________
3
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
Typical Operating Characteristics
(T = +25°C, unless otherwise noted.)
A
SUPPLY CURRENT vs. TEMPERATURE
BATTERY SUPPLY CURRENT
(BACKUP MODE) vs. TEMPERATURE
BATTERY TO OUT ON-RESISTANCE
vs. TEMPERATURE
(NO LOAD)
20
1.2
1.0
0.8
0.6
0.4
0.2
0
7
6
5
4
3
2
1
0
V
CC
= 0
V
= 2.8V
BATT
18
16
14
V
= 2.0V
BATT
V
= 2.8V
BATT
V
= 2.0V
BATT
V
= 5.0V
20
BATT
0
I
= 25mA
= 0
OUT
V
V
= 0
BATT
V
CC
= 5.0V
CC
12
-40 -20
0
20
40
60
80
-40 -20
0
20
40
60
80
-40 -20
40
60
80
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
V
TO OUT ON-RESISTANCE
vs. TEMPERATURE
RESET TIMEOUT PERIOD
vs. TEMPERATURE
V
TO RESET PROPAGATION DELAY
vs. TEMPERATURE
CC
CC
1.2
0.9
0.6
0.3
0
210
205
200
195
190
135
120
105
90
75
60
45
30
15
0
V
OUT
= 2.3V
CC
V
FALLING
CC
I
= 25mA
0.25V/ms
V
OUT
= 3.0V
CC
I
= 65mA
V
OUT
= 4.5V
= 150mA
CC
I
1V/ms
20
10V/ms
0
-40 -20
0
20
40
60
80
-40 -20
0
20
40
60
80
-40 -20
40
60
80
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
RESET THRESHOLD
vs. TEMPERATURE
BATTERY SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
10
9
8
7
6
5
4
3
2
1
0
5.0
400
350
300
250
200
150
100
50
MAX636_46
V
TH
= 2.93V
4.5
4.0
3.5
3.0
2.5
2.0
V
= 2.8V
BATT
MAX636_46
V
= 2.5V
BATT
RESET OCCURS
ABOVE CURVE
MAX636_26
MAX636_26
V
= 2.3V
BATT
1
0
-40 -20
0
20
40
60
80
1
10
100
1k
10k
0
2
3
4
TEMPERATURE (°C)
RESET THRESHOLD OVERDRIVE V - V (mV)
V
(V)
TH CC
CC
4
_______________________________________________________________________________________
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
Typical Operating Characteristics (continued)
(T = +25°C, unless otherwise noted.)
A
MAX6364
MAX6364
RESET IN THRESHOLD
vs. TEMPERATURE
RESET IN TO RESET PROPAGATION DELAY
vs. TEMPERATURE
1.236
1.235
1.234
V
= 50mV
OD
2.8
2.5
2.2
1.9
1.6
1.3
1.0
-40 -20
0
20
40
60
80
-40 -20
0
20
40
60
80
TEMPERATURE (°C)
TEMPERATURE (°C)
Pin Description
PIN
NAME
FUNCTION
Active-High Reset Output (for H versions). RESET remains high while V
is below the reset threshold
CC
RESET
and for at least 150ms (t ) after V
rises above the reset threshold. RESET also asserts when MR or
RP
CC
RESET IN is low.
1
2
Active-Low Reset Output (for L and P versions). RESET remains low while V
old and for at least 150ms (t ) after V
or RESET IN is low.
Ground
is below the reset thresh-
rises above the reset threshold. RESET also asserts when MR
CC
RESET
GND
MR
RP
CC
MAX6361 Manual-Reset Input. Maintaining logic low on MR asserts a reset. Reset output remains assert-
ed for at least 150ms (t ) after MR transitions from low to high. Leave unconnected or connected to V
RP
CC
if not used.
3
BATT ON
RESET IN
MAX6363 Battery-On Output. BATT ON goes high in battery backup mode.
MAX6364 Reset Input. When RESET IN falls below 1.235V, reset is asserted. Reset output remains
asserted as long as RESET IN is low and for at least 150ms (t ) after RESET IN goes high.
RP
Supply Voltage. Reset is asserted when V
drops below the reset threshold voltage (V ). Reset
TH
CC
4
5
V
CC
remains asserted until V
rises above V and for at least 150ms after V
rises above V
.
CC
TH
CC
TH
Output. OUT sources from V
when it is above the reset threshold (V ), and from the greater of V
or
CC
CC
TH
OUT
BATT when V
is below V
.
CC
TH
Backup-Battery Input. When V
falls below the reset threshold, BATT switches to OUT if V
is 20mV
CC
BATT
6
BATT
greater than V . When V
rises 20mV above V , V
BATT CC
switches to OUT. The 40mV hysteresis
CC
CC
prevents repeated switching if V
falls slowly.
CC
to 150mA from V . When V
is higher than V
, the
CC
CC
BATT
is lower
Detailed Description
The Typical Operating Circuit shows a typical connec-
tion for the MAX6361/MAX6363/MAX6364 family. OUT
powers the static random-access memory (SRAM). OUT
BATT ON (MAX6363) output is low. When V
CC
than V , an internal MOSFET connects the backup
BATT
battery to OUT. The on-resistance of the MOSFET is a
function of backup-battery voltage and is shown in the
Battery to Out On-Resistance vs. Temperature graph in
the Typical Operating Characteristics section.
is internally connected to V
if V
is greater than the
CC
CC
reset threshold, or to the greater of V
or V
when
CC
BATT
V
CC
is less than the reset threshold. OUT can supply up
_______________________________________________________________________________________
5
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
Backup-Battery Switchover
Applications Information
In a brownout or power failure, it may be necessary to
preserve the contents of the RAM. With a backup bat-
tery installed at BATT, the MAX6361/MAX6363/
MAX6364 automatically switch the RAM to backup
Operation Without a Backup
Power Source
The MAX6361/MAX6363/MAX6364 were designed for
battery-backed applications. If a backup battery is not
power when V
falls. The MAX6363 has a BATT ON
CC
used, connect V
to OUT and connect BATT to GND.
output that goes high when in battery-backup mode.
These devices require two conditions before switching
to battery-backup mode:
CC
Replacing the Backup Battery
If BATT is decoupled with a 0.1µF capacitor to ground,
the backup power source can be removed while V
1) V
2) V
must be below the reset threshold.
CC
CC
remains valid without danger of triggering a reset pulse.
The device does not enter battery-backup mode when
must be below V
. Table 2 lists the status
CC
BATT
of the inputs and outputs in battery-backup mode.
The device will not power up if the only voltage
source is on BATT. OUT will only power up from
V
stays above the reset threshold voltage.
CC
Negative-Going V
CC
Transients
V
CC
at startup.
These supervisors are relatively immune to short-dura-
tion, negative-going V transients. Resetting the µP
Manual Reset Input (MAX6361 only)
CC
when V
desirable.
experiences only small glitches is usually not
Many µP-based products require manual reset capabili-
ty, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. For the MAX6361, a logic
low on MR asserts reset. Reset remains asserted while
CC
The Typical Operating Characteristics section shows a
graph of Maximum Transient Duration vs. Reset
Threshold Overdrive for which reset is not asserted.
MR is low, and for a minimum of 150ms (t ) after it
RP
returns high. MR has an internal 20kΩ pull-up resistor.
This input can be driven with TTL/CMOS logic levels or
with open-drain/collector outputs. Connect a normally
open momentary switch from MR to GND to create a
manual reset function; external debounce circuitry is not
required. If MR is driven from long cables or the device
is used in a noisy environment, connect a 0.1µF capaci-
tor from MR to GND to provide additional noise immunity.
The graph was produced using negative-going V
CC
pulses, starting at V
and ending below the reset
CC
threshold by the magnitude indicated (reset threshold
overdrive). The graph shows the maximum pulse width
Table 1. Reset Threshold Ranges
RESET THRESHOLD RANGES (V)
SUFFIX
MIN
4.50
4.25
3.00
2.85
2.55
2.25
TYP
4.63
4.38
3.08
2.93
2.63
2.32
MAX
4.75
4.50
3.15
3.00
2.70
2.38
Reset In (MAX6364 only)
RESET IN is compared to an internal 1.235V reference.
If the voltage at RESET IN is less than 1.235V, reset is
asserted. The RESET IN comparator may be used as
an undervoltage detector to signal a failing power sup-
ply. It can also be used as a secondary power-supply
reset monitor.
46
44
31
29
26
23
Reset Output
A µP’s reset input starts the µP in a known state. The
MAX6361/MAX6363/MAX6364 µP supervisory circuits
assert a reset to prevent code-execution errors during
power-up, power-down, and brownout conditions.
RESET is guaranteed to be a logic low or high depend-
ing on the device chosen (see Ordering Information).
Table 2. Input and Output Status in
Battery-Backup Mode
PIN
STATUS
Disconnected from OUT
Connected to BATT
V
CC
OUT
RESET or RESET asserts when V
is below the reset
CC
Connected to OUT. Current drawn from
threshold and for at least 150ms (t ) after V
rises
CC
RP
BATT
the battery is less than 1µA (at V
=
BATT
= 0.
above the reset threshold. RESET or RESET also
asserts when MR is low (MAX6361) and when RESET
IN is less than 1.235V (MAX6364).
2.8V, excluding I
) when V
OUT
CC
Asserted
RESET/RESET
BATT ON
High state
Inputs ignored
MR, RESET IN
6
_______________________________________________________________________________________
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
Selector Guide
MANUAL RESET INPUT,
BATT
ON
RESET
IN
RESET
PUSH-PULL
RESET
PUSH-PULL
RESET
OPEN-DRAIN
PART
MR
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
MAX6361LUT_ _
MAX6361PUT_ _
MAX6361HUT_ _
MAX6363LUT_ _
MAX6363PUT_ _
MAX6363HUT_ _
MAX6364LUT_ _
MAX6364PUT_ _
MAX6364HUT_ _
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
Device Marking Codes
PART
TOP MARK
PART
TOP MARK
PART
TOP MARK
AAGK
AAGJ
MAX6361LUT23
MAX6361LUT26
MAX6361LUT29*
MAX6361LUT31
MAX6361LUT44
MAX6361LUT46*
MAX6361PUT23
MAX6361PUT26
MAX6361PUT29*
MAX6361PUT31
MAX6361PUT44
MAX6361PUT46*
MAX6361HUT23
MAX6361HUT26
MAX6361HUT29
MAX6361HUT31
MAX6361HUT44
MAX6361HUT46*
AAEI
AAEH
AAEG
AAEF
AAEE
AAED
AAEO
AAEN
AAEM
AAEL
AAEK
AAEJ
AAEU
AAET
AAES
AAER
AAEQ
AAEP
MAX6363LUT23
MAX6363LUT26
MAX6363LUT29*
MAX6363LUT31
MAX6363LUT44
MAX6363LUT46*
MAX6363PUT23
MAX6363PUT26
MAX6363PUT29*
MAX6363PUT31
MAX6363PUT44
MAX6363PUT46*
MAX6363HUT23
MAX6363HUT26
MAX6363HUT29
MAX6363HUT31
MAX6363HUT44
MAX6363HUT46*
AAFS
AAFR
AAFQ
AAFP
AAFO
AAFN
AAFY
AAFX
AAFW
AAFV
AAFU
AAFT
AAGE
AAGD
AAGC
AAGB
AAGA
AAFZ
MAX6364LUT23
MAX6364LUT26
MAX6364LUT29*
MAX6364LUT31
MAX6364LUT44
MAX6364LUT46*
MAX6364PUT23
MAX6364PUT26
MAX6364PUT29*
MAX6364PUT31
MAX6364PUT44
MAX6364PUT46*
MAX6364HUT23
MAX6364HUT26
MAX6364HUT29
MAX6364HUT31
MAX6364HUT44
MAX6364HUT46*
AAGI
AAGH
AAGG
AAGF
AAGQ
AAGP
AAGO
AAGN
AAGM
AAGL
AAGW
AAGV
AAGU
AAGT
AAGS
AAGR
*Sample stock generally held on standard versions only. Contact factory for availability of nonstandard versions.
that a negative-going V
transient can typically have
A 0.1µF bypass capacitor mounted close to the V
pin provides additional transient immunity.
CC
CC
without triggering a reset pulse. As the amplitude of the
transient increases (i.e., goes further below the reset
threshold), the maximum allowable pulse width
decreases. Typically, a V
transient that goes 100mV
CC
below the reset threshold and lasts for 30µs will not
trigger a reset pulse.
_______________________________________________________________________________________
7
SOT23, Low-Power µP Supervisory Circuits
with Battery Backup
Pin Configurations (continued)
Typical Operating Circuit
2.4V TO 5.5V
TOP VIEW
UNREGULATED
DC VOLTAGE
RESET, RESET
GND
1
2
3
6
5
4
BATT
OUT
V
CC
0.1µF
V
CC
R1
MAX6363
RESET
OUT
RESET
µP
RESET IN
GND
R2
MAX6364
BATT ON
V
CC
SOT23-6
BATT
V
3.6V Li+
CC
BATTERY
SRAM
GND
GND
0.1µF
RESET, RESET
GND
1
2
3
6
5
4
BATT
OUT
MAX6364
Chip Information
RESET IN
V
CC
TRANSISTOR COUNT: 720
SOT23-6
Package Information
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2000 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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