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參數(shù)資料
| 型號(hào)： | ADM708RAR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 電源管理 |
| 英文描述： | +3 V, Voltage Monitoring uP Supervisory Circuits |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁(yè)數(shù)： | 6/8頁(yè) |
| 文件大?。?/td> | 129K |
| 代理商： | ADM708RAR |
REV. A
–6–
ADM706P/R/S/T, ADM708R/S/T
V
MID
1.25
R
1
+
R
2
R
2
Valid RESET Below 1 V V
CC
The ADM70x family of products are guaranteed to provide a
valid reset level with V
CC
as low as 1 V. Please refer to the Typi-
cal Performance Characteristics. As V
CC
drops below 1 V, the
internal transistor will not have sufficient drive to hold it ON so
the voltage on
RESET
will no longer be held at 0 V. A pull-
down resistor as shown in Figure 7 may be connected externally
to hold the line low if it is required.
ADM70x
GND
RESET
R1
Figure 7.
RESET
Valid Below 1 V
Power-Fail Comparator
The power-fail comparator is an independent comparator which
may be used to monitor the input power supply. The compara-
tor’s inverting input is internally connected to a 1.25 V reference
voltage. The noninverting input is available at the PFI input.
This input may be used to monitor the input power supply via a
resistive divider network. When the voltage on the PFI input drops
below 1.25 V, the comparator output (
PFO
) goes low indicating
a power failure. For early warning of power failure the compara-
tor may be used to monitor the preregulator input simply by
choosing an appropriate resistive divider network. The
PFO
output
can be used to interrupt the processor so that a shutdown proce-
dure is implemented before the power is lost.
INPUT
POWER
R1
R2
POWER-FAIL
INPUT
1.25V
PFI
PFO
ADM70x
POWER-FAIL
OUTPUT
Figure 5. Power-Fail Comparator
Adding Hysteresis to the Power-Fail Comparator
For increased noise immunity, hysteresis may be added to the
power-fail comparator. Since the comparator circuit is nonin-
verting, hysteresis can be added simply by connecting a resistor
between the
PFO
output and the PFI input as shown in Figure
6. When
PFO
is low, resistor R3 sinks current from the sum-
ming junction at the PFI pin. When
PFO
is high, resistor R3
sources current into the PFI summing junction. This results in
differing trip levels for the comparator. Further noise immunity
may be achieved by connecting a capacitor between PFI and GND.
INPUT
POWER
R1
R2
1.25V
PFI
PFO
TO
m
P NMI
ADM70x
R3
ADM663A
+3.3V
V
CC
3.3V
PFO
0V
0V
V
L
V
IN
V
H
Figure 6. Adding Hysteresis to the Power-Fail
Comparator
V
H
=
1.25 1
+
R
2
+
R
3
R
2
×
R
3
R
1
V
L
=
1.25
+
R
1
1.25
R
2
–
V
CC
– 1.25
R
3
V
CC
RESET
400ms/DIV
Figure 8. ADM706/ADM708
RESET
Output Voltage vs.
Supply Voltage
V
CC
RESET
400ms/DIV
Figure 9. RESET Output Voltage vs. Supply Voltage
Typical Performance Characteristics
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADM708SAN | +3 V, Voltage Monitoring uP Supervisory Circuits |
| ADM708SAR | +3 V, Voltage Monitoring uP Supervisory Circuits |
| ADM708T | Analog Switch / Multiplexer (Mux) IC; On-Resistance, Rds(on):100ohm; Analog Switch Function:SPST; No. of Channels:4; Leakage Current:1nA; Supply Voltage Max:44V; Package/Case:16-DIP; Leaded Process Compatible:No RoHS Compliant: No |
| ADM708TAN | +3 V, Voltage Monitoring uP Supervisory Circuits |
| ADM708TAR | Analog Switch / Multiplexer (Mux) IC; Analog Switch Function:SPST; Package/Case:16-SOIC; Leaded Process Compatible:No; Leakage Current:1nA; No. of Channels:4; On Resistance, Rds(on):100ohm; Peak Reflow Compatible (260 C):No RoHS Compliant: No |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADM708RAR-REEL | 功能描述:IC SUPERVISOR MPU 2.63V WD 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:400 系列:- 類型:備用電池電路 監(jiān)視電壓數(shù)目:1 輸出:開(kāi)路漏極，推挽式 復(fù)位:高有效/低有效 復(fù)位超時(shí):最小為 35 ms 電壓 - 閥值:4.65V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC W 包裝:帶卷 (TR) 其它名稱:ADM691ARZ-REEL7TR |
| ADM708RARZ | 功能描述:IC SUPERVISOR MPU 2.63V WD 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 其它有關(guān)文件:STM6717 View All Specifications 標(biāo)準(zhǔn)包裝:1 系列:- 類型:多壓監(jiān)控器 監(jiān)視電壓數(shù)目:2 輸出:開(kāi)路漏極或開(kāi)路集電極 復(fù)位:低有效 復(fù)位超時(shí):最小為 600 ms 電壓 - 閥值:1.11V，3.075V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:Digi-Reel® 產(chǎn)品目錄頁(yè)面:1194 (CN2011-ZH PDF) 其它名稱:497-7019-6 |
| ADM708RARZ-REEL | 功能描述:IC SUPERVISOR MPU 2.63V WD 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:400 系列:- 類型:備用電池電路 監(jiān)視電壓數(shù)目:1 輸出:開(kāi)路漏極，推挽式 復(fù)位:高有效/低有效 復(fù)位超時(shí):最小為 35 ms 電壓 - 閥值:4.65V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC W 包裝:帶卷 (TR) 其它名稱:ADM691ARZ-REEL7TR |
| ADM708S | 制造商:AD 制造商全稱:Analog Devices 功能描述:3 V, Voltage Monitoring Microprocessor Supervisory Circuits |
| ADM708SAN | 制造商:Analog Devices 功能描述:Processor Supervisor 2.93V 2.93V 8-Pin PDIP 制造商:Analog Devices 功能描述:PROCESSOR SUPERVISOR 2.93V 350UA 8PDIP - Rail/Tube 制造商:Rochester Electronics LLC 功能描述:RESET GENERATOR I.C. - Bulk |
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