- 您現(xiàn)在的位置：買賣IC網 > PDF目錄296469 > MAX690RESA-T (MAXIM INTEGRATED PRODUCTS INC) 3.0V/3.3V Microprocessor Supervisory Circuits PDF資料下載
參數(shù)資料
| 型號： | MAX690RESA-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 3.0V/3.3V Microprocessor Supervisory Circuits |
| 中文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 281K |
| 代理商： | MAX690RESA-T |
Watchdog Input
(MAX690_/802_/804_/805_)
The watchdog circuit monitors the P’s activity. If the P
does not toggle the watchdog input (WDI) within 1.6sec,
a reset pulse is triggered. The internal 1.6sec timer is
cleared by either a reset pulse or by a transition (low-to-
high or high-to-low) at WDI. If WDI is tied high or low, a
–
R
—
E
—
S
—
E
—
T
–
pulse is triggered every 1.8sec (tWD plus tRS).
As long as reset is asserted, the timer remains cleared
and does not count. As soon as reset is deasserted,
the timer starts counting. Unlike the 5V MAX690 family,
the watchdog function cannot be disabled.
Power-Fail Comparator
The PFI input is compared to an internal reference. If
PFI is less than VPFT,
–
P
—
F
—
O
–
goes low. The power-fail
comparator is intended for use as an undervoltage
detector to signal a failing power supply. However, the
comparator does not need to be dedicated to this
function because it is completely separate from the rest
of the circuitry.
The power-fail comparator turns off and
–
P
—
F
—
O
–
goes low
when VCC falls below VSW on power-down. The power-
fail comparator turns on as VCC crosses VSW on
power-up. If the comparator is not used, connect PFI to
ground and leave
–
P
—
F
—
O
–
unconnected.
–
P
—
F
—
O
–
may be
connected to
–
M
—
R
–
on the MAX704_/MAX806_ so that a
low voltage on PFI will generate a reset (Figure 5b).
MAX690T/S/R,
704T/S/R,
802T/S/R,
804–806T/S/R
3.0V/3.3V Microprocessor Supervisory Circuits
_______________________________________________________________________________________
7
V
BATT
RESET
(RESET)
WDI
VCC
MR
BATTERY
SWITCHOVER
COMPARATOR
RESET
COMPARATOR
RESET
GENERATOR
WATCHDOG
TIMER
BATTERY
SWITCHOVER
CIRCUITRY
MAX690T/S/R
MAX704T/S/R
MAX802T/S/R
MAX804T/S/R
MAX805T/S/R
MAX806T/S/R
PFO
VOUT
PFI
VPFT
1.237V
**
*
POWER-FAIL
COMPARATOR
* MAX690T/S/R, MAX802T/S/R, MAX804T/S/R, MAX805T/S/R ONLY
** MAX704T/S/R, MAX806T/S/R ONLY
( ) MAX804T/S/R, MAX805T/S/R ONLY
VBATT = 3.6V
3.0V OR 3.3V
VSW
tWP
RESET
PFO
VCC
( ) MAX804T/S/R, MAX805T/S/R ONLY, RESET EXTERNALLY PULLED UP TO VCC
VOUT
VSW
(RESET)
3.0V OR 3.3V
0V
VRST
V
BATT = PFI = 3.6V
IOUT = 0mA
Figure 1. Block Diagram
Figure 2. Timing Diagram
相關PDF資料 |
PDF描述 |
|---|---|
| MAX690SCSA-T | 3.0V/3.3V Microprocessor Supervisory Circuits |
| MAX690SESA-T | 3.0V/3.3V Microprocessor Supervisory Circuits |
| MAX690TCSA-T | 3.0V/3.3V Microprocessor Supervisory Circuits |
| MAX690TESA-T | 3.0V/3.3V Microprocessor Supervisory Circuits |
| MAX691ACSE-T | Microprocessor Supervisory Circuits |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX690RMJA | 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 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX690SC/D | 功能描述:監(jiān)控電路 3.0V/3.3V Microprocessor Supervisory Circuit with Reset Threshold of 2.925V 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 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX690SCPA | 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 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX690SCPA+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX690SCSA | 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 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（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。