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參數(shù)資料
| 型號： | LM3722IM5-4.63/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁數(shù)： | 10/12頁 |
| 文件大小： | 290K |
| 代理商： | LM3722IM5-4.63/NOPB |
Timing Diagram
20014412
Circuit Information
RESET OUTPUT
The reset input of a P initializes the device into a known
state. The LM3722/LM3723/LM3724 microprocessor voltage
monitoring circuits assert a forced reset output to prevent
code execution errors during power-up, power-down, and
brownout conditions.
RESET is guaranteed valid for V
CC ≥ 1V. Once VCC exceeds
the reset threshold, an internal timer maintains the output for
the reset timeout period. After this interval, reset goes high
and the microprocessor initializes itself into a known state.
The LM3722 and LM3724 offer an active-low RESET; the
LM3723 offers an active-high RESET.
As V
CC drops below the reset threshold (such as during a
brownout), the reset activates (see the Negative-Going V
CC
Transients section). When V
CC again rises above the reset
threshold, the internal timer starts. Reset holds until V
CC ex-
ceeds the reset threshold for longer than the reset timeout
period. After this time, reset releases.
Additionally, the Manual Reset input (MR) will initiate a forced
reset. See the Manual Reset Input section.
The LM3722/LM3723/LM3724 reset outputs ignore short du-
ration glitches on V
CC and MR. See the Applications Informa-
tion section for details.
RESET THRESHOLD
The LM3722/LM3723/LM3724 are available with reset volt-
ages of 4.63V, 3.08V, and 2.32V which are suitable for mon-
itoring 5.0V, 3.3V, and 2.5V supplies respectively. Other reset
thresholds in the 2.20V to 5.0V range, in 10 mV steps, are
available; contact National Semiconductor for details.
MANUAL RESET INPUT (MR)
Many P-based products require a manual reset capability,
allowing the operator to initiate a reset. The MR input is fully
debounced and provides an internal 22 k
pull-up. When the
MR input is pulled below V
IL (0.25VCC) for more than 100 ns,
reset is asserted after a typical delay of 2 s. Reset remains
active as long as MR is held low, and releases after MR rises
above V
IH and the reset timeout period expires. Use MR with
digital logic to assert reset or to daisy chain supervisory cir-
cuits.
Applications Information
BENEFITS OF PRECISION RESET THRESHOLDS
A microprocessor supply supervisor must provide a reset out-
put within a predictable range of the supply voltage. A com-
mon threshold range is between 5% and 10% below the
nominal supply voltage. The 4.63V, 3.08V and 2.32V options
of the LM3722/LM3723/LM3724 use highly accurate circuitry
to ensure that the reset threshold occurs only within this range
(for 5.0V, 3.3V and 2.5V supplies). Table 1 shows how the
standard reset thresholds apply to 5.0V, 3.3V, and 2.5V nom-
inal supply voltages.
7
www.national.com
LM3722/LM3723/LM3724
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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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| LM3722IM5X-2.32/NOPB | 功能描述:IC MPU SUPERVISR 2.32V SOT23-5 RoHS:是 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:簡單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:推挽式，圖騰柱 復(fù)位:低有效 復(fù)位超時:最小 145 ms 電壓 - 閥值:2.64V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:16-TQFN-EP（4x4） 包裝:帶卷 (TR) |
| LM3722IM5X-3.08/NOPB | 功能描述:IC MPU SUPERVISR 3.08V SOT23-5 RoHS:是 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:簡單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:推挽式，圖騰柱 復(fù)位:低有效 復(fù)位超時:最小 145 ms 電壓 - 閥值:2.64V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:16-TQFN-EP（4x4） 包裝:帶卷 (TR) |
| LM3722IM5X-4.63/NOPB | 功能描述:IC MPU SUPERVISR 4.63V SOT23-5 RoHS:是 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:簡單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:推挽式，圖騰柱 復(fù)位:低有效 復(fù)位超時:最小 145 ms 電壓 - 閥值:2.64V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:16-TQFN-EP（4x4） 包裝:帶卷 (TR) |
| LM3723A-3.08 WAF | 制造商:Texas Instruments 功能描述: |
| LM3723A-4.63 WAF | 制造商:Texas Instruments 功能描述: |
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