- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄385551 > MAX807MCUE (MAXIM INTEGRATED PRODUCTS INC) Full-Featured uP Supervisory Circuit with +/-1.5% Reset Accuracy PDF資料下載
參數(shù)資料
| 型號： | MAX807MCUE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | Full-Featured uP Supervisory Circuit with +/-1.5% Reset Accuracy |
| 中文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO16 |
| 封裝： | TSSOP-16 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 196K |
| 代理商： | MAX807MCUE |
Battery-Backup Mode
Battery backup preserves the contents of RAM in the
event of a brownout or power failure. With a backup
battery installed at BATT, the MAX807 automatically
switches RAM to backup power when V
CC
falls. Two
conditions are required for switchover to battery-back-
up mode: 1) V
CC
must be below the reset threshold; 2)
V
CC
must be below V
BATT
. Table 1 lists the status of
inputs and outputs during battery-backup mode.
Backup-Battery Input
The BATT input is similar to V
CC
, except the PMOS
switch is much smaller. This input is designed to con-
duct up to 20mA to OUT during battery backup. The
on-resistance of the PMOS switch is approximately
13
. Figure 12 shows the two series pass elements
between the BATT input and OUT that facilitate UL
approval. V
BATT
can exceed V
CC
during normal opera-
tion without causing a reset.
Output Supply Voltage
The output supply (OUT) transfers power from V
CC
or
BATT to the μP, RAM, and other external circuitry. At
the maximum source current of 250mA, V
OUT
will typi-
cally be 260mV below V
CC
. Decouple this terminal with
a 0.1μF capacitor.
BATT ON Output
The battery on (BATT ON) output indicates the status of
the internal battery switchover comparator, which con-
trols the internal V
CC
and BATT switches. For V
CC
greater than V
BATT
(ignoring the small hysteresis
effect), BATT ON typically sinks 3.2mA at 0.4V. In bat-
tery-backup mode, this output sources approximately
5mA. Use BATT ON to indicate battery switchover sta-
tus, or to supply gate or base drive for an external pass
transistor for higher current applications (see the
Typical Operating Circuit
).
M
Full-Featured μP Supervisory Circuit with
±1.5% Reset Accuracy
______________________________________________________________________________________
13
Figure 12. V
CC
and BATT-to-OUT Switch
MAX807
P
P
P
OUT
V
CC
BATT
0.1
μ
F
CONTROL
CIRCUITRY
Table 1. Input and Output Status in Battery-Backup Mode
The power-fail comparator remains active in battery-backup mode for V
CC
≥
4V. Below 4V, PFO is forced low.
Battery switchover comparator monitors V
CC
for active switchover.
PFO
V
CC
2
3
WDI is ignored and goes high impedance
WDI
4
MR is ignored
Logic low
MR
6
7
Logic high; the open-circuit output voltage is equal to V
CC
.
Logic low
RESET
RESET
8
9
LOW LINE
Ground—0V reference for all signals
GND
5
Logic high. The open-circuit output voltage is equal to V
CC
.
Logic high. The open-circuit output voltage is equal to V
BATT
.
WDO
CE OUT
10
11
High impedance
Logic high. The open-circuit output voltage is equal to V
BATT
.
CE IN
BATT ON
12
13
Supply current is 1μA maximum for V
BATT
≤
2.8V.
Logic high when V
BATT
exceeds 2.285V. Valid for V
CC
≥
4V. Below 4V, BATT OK is forced low.
BATT
BATT OK
14
15
PIN
1
OUT is connected to BATT through two internal PMOS switches in series.
OUT
16
The power-fail comparator remains active in battery-backup mode for V
CC
≥
4V.
PFI
FUNCTION
NAME
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX810 | 3-Pin Microprocessor Reset Circuits(3管腳微處理器復(fù)位監(jiān)視器) |
| MAX809 | 3-Pin Microprocessor Reset Circuits(3管腳微處理器復(fù)位監(jiān)視器) |
| MAX811 | 4-Pin μP Reset Monitor(3腳μP監(jiān)控電路復(fù)位監(jiān)視器（低電平復(fù)位）) |
| MAX812 | 4-Pin μP Reset Monitor(3腳μP監(jiān)控電路復(fù)位監(jiān)視器（高電平復(fù)位）) |
| MAX812_EUS-T | 4-Pin レP Voltage Monitors with Manual Reset Input |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX807MCUE+ | 功能描述:監(jiān)控電路 Full-Featured uPower 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 |
| MAX807MCUE+T | 功能描述:監(jiān)控電路 Full-Featured uPower 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 |
| MAX807MCUE-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 |
| MAX807MCWE | 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 |
| MAX807MCWE+ | 功能描述:監(jiān)控電路 Full-Featured uPower 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。