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參數(shù)資料
| 型號： | MAX6364LUT31 |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | SOT23, Low-Power レP Supervisory Circuits with Battery Backup |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封裝： | SOT-23, 6 PIN |
| 文件頁數(shù)： | 6/8頁 |
| 文件大小： | 104K |
| 代理商： | MAX6364LUT31 |
M
Backup-Battery Switchover
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
power when V
CC
falls. The MAX6363 has a BATT ON
output that goes high when in battery-backup mode.
These devices require two conditions before switching
to battery-backup mode:
1) V
CC
must be below the reset threshold.
2) V
CC
must be below V
BATT
. Table 2 lists the status
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
CC
at startup.
Manual Reset Input (MAX6361 only)
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
MR
is low, and for a minimum of 150ms (t
RP
) after it
returns high.
MR
has an internal 20k
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.
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.
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
).
RESET or
RESET
asserts when V
CC
is below the reset
threshold and for at least 150ms (t
RP
) after V
CC
rises
above the reset threshold. RESET or
RESET
also
asserts when
MR
is low (MAX6361) and when RESET
IN is less than 1.235V (MAX6364).
Applications Information
Operation Without a Backup
Power Source
The MAX6361/MAX6363/MAX6364 were designed for
battery-backed applications. If a backup battery is not
used, connect V
CC
to OUT and connect BATT to GND.
Replacing the Backup Battery
If BATT is decoupled with a 0.1μF capacitor to ground,
the backup power source can be removed while V
CC
remains valid without danger of triggering a reset pulse.
The device does not enter battery-backup mode when
V
CC
stays above the reset threshold voltage.
Negative-Going V
CC
Transients
These supervisors are relatively immune to short-dura-
tion, negative-going V
CC
transients. Resetting the μP
when V
CC
experiences only small glitches is usually not
desirable.
The
Typical Operating Characteristics
section shows a
graph of Maximum Transient Duration vs. Reset
Threshold Overdrive for which reset is not asserted.
The graph was produced using negative-going V
CC
pulses, starting at V
CC
and ending below the reset
threshold by the magnitude indicated (reset threshold
overdrive). The graph shows the maximum pulse width
SOT23, Low-Power μP Supervisory Circuits
with Battery Backup
6
_______________________________________________________________________________________
PIN
V
CC
OUT
STATUS
Disconnected from OUT
Connected to BATT
Connected to OUT. Current drawn from
the battery is less than 1μA (at V
BATT
=
2.8V, excluding I
OUT
) when V
CC
= 0.
Asserted
High state
Inputs ignored
BATT
RESET/
RESET
BATT ON
MR
, RESET IN
Table 2. Input and Output Status in
Battery-Backup Mode
SUFFIX
46
44
31
29
26
4.50
4.25
3.00
2.85
2.55
4.63
4.38
3.08
2.93
2.63
4.75
4.50
3.15
3.00
2.70
23
2.25
2.32
2.38
RESET THRESHOLD RANGES (V)
MIN
TYP
Table 1. Reset Threshold Ranges
MAX
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PDF描述 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6364LUT31+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 3.08V 15UA 6PIN SOT-23 - Rail/Tube |
| MAX6364LUT31+T | 功能描述:監(jiān)控電路 Low-Power MPU Supervisor RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX6364LUT31-T | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX6364LUT44 | 制造商:Maxim Integrated Products 功能描述:SOT23 LOW-POWER UP SUPERVISORY CIR - Cut Tape Product |
| MAX6364LUT44-T | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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