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參數(shù)資料
| 型號(hào)： | MAX691A |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Microprocessor Supervisory Circuits(帶看門(mén)狗復(fù)位、片選和支持備用電池的復(fù)位器) |
| 中文描述： | 微處理器監(jiān)控電路 |
| 文件頁(yè)數(shù)： | 13/16頁(yè) |
| 文件大小： | 164K |
| 代理商： | MAX691A |
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Using S eparate Power S upplies
for V BAT T and V
If using separate power supplies for V
CC
and VBATT,
VBATT must be less than 0.3V above V
when V
is
above the reset threshold. As described in the previ-
ous section, if VBATT exceeds this limit and power is
lost at V
, current flows continuously from VBATT to
V
via the VBATT-to-V
diode and the V
OUT
-to-V
CC
switch until the circuit is broken (Figure 8).
Alternative Chip-Enable Gating
Using memory devices with both CE and –—–inputs
allows the CE loop to be bypassed. To do this, con-
connect –—–OUT to the –—–input of each m, and
device (Figure 10). The CE input of each part then
connects directly to the chip-select logic, which does
not have to be gated.
Adding Hysteresis to the
Power-Fail Comparator
Hysteresis adds a noise margin to the power-fail com-
V
is near the power-fail comparator trip point. Figure
11 shows how to add hysteresis to the power-fail com-
M
Mic roproc essor S upervisory Circ uits
______________________________________________________________________________________
13
MAX691A
MAX693A
MAX800L
MAX800M
V
OUT
GND
CE IN
CE
CE
CE OUT
CE
CE
CE
CE
CE
CE
*MAXIMUM Rp VALUE DEPENDS ON
THE NUMBER OF RAMS.
MINIMUM Rp VALUE IS 1k
.
ACTIVE-HIGH
CE LINES
FROM LOGIC
RAM 1
RAM 2
RAM 3
RAM 4
Rp*
MAX691A
MAX693A
MAX800L
MAX800M
V
CC
GND
PFI
*OPTIONAL
R2
R3
R1
V
IN
+5V
C1*
TO
μ
P
PFO
TRIP
= 1.25 R1 + R2
V
H
= 1.25/ R2 I I R3 V
L
- 1.25 + 5 - 1.25 = 1.25
V
PFO
5V
0V
0V
V
H
V
TRIP
V
IN
V
L
MAX691A
MAX693A
MAX800L
MAX800M
V
CC
GND
PFI
R2
R1
5V
PFO
PFO
5V
0V
NOTE
: V
TRIP
IS NEGATIVE
0V
V
TRIP
V-
TRIP
5 - 1.25 = 1.25 - V
V-
Figure 10. Alternate CE Gating
Figure 12. Monitoring a Negative Voltage
Figure 11. Adding Hysteresis to the Power-Fail Comparator
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| MAX691AC/D | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)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 |
| MAX691ACPE | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)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 |
| MAX691ACPE+ | 功能描述:監(jiān)控電路 MPU Supervisor RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)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 |
| MAX691ACSE | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)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 |
| MAX691ACSE+ | 功能描述:監(jiān)控電路 MPU Supervisor RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)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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