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參數資料
| 型號： | PT7M7809ZTE |
| 廠商： | PERICOM SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO3 |
| 封裝： | LEAD FREE, TO-236AB, SOT-23, 3 PIN |
| 文件頁數： | 2/17頁 |
| 文件大小： | 259K |
| 代理商： | PT7M7809ZTE |
10
Data Sheet
PT7M7803/7809-7812/7823-7825/7342-7345
P Supervisor Circuits
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PT0109L(09/07)
Ver:12
Functional Description
Reset Output
A microprocessor (
P) reset input starts the P in a known
state. Whenever the
P is in an unknown state, it should be
held in reset. The supervisory circuits assert reset during power-
up and prevent code execution errors during power-down or
brownout conditions.
On power-up, once Vcc reaches about 1.0V, RESET is a
guaranteed logic low of 0.4V or less. As Vcc rises, RESET stays
low. When Vcc rises above the reset threshold, an internal timer
releases RESET after about 200ms. RESET pulses low whenever
Vcc drops below the reset threshold, i.e. brownout condition. If
brownout occurs in the middle of a previously initiated reset
pulse, the pulse continues for at least another 200ms. On power-
down, once Vcc falls below the reset threshold, RESET stays
low and is guaranteed to be 0.4V or less until Vcc drops below
1.0V. Watchdog Timing Diagram shows the timing relationship.
The active-high RESET output is simply the inverse of the
RESET output, and is guaranteed to be valid with Vcc down to
1.0V.
Watchdog Timer
The PT7M7xxx watchdog circuit monitors the
Pactivity. If the
P does not toggle the watch-dog input (WDI) within 1.6s,
reset asserts. As long as reset is asserted or the WDI input is
toggled, the watchdog timer will stay clear and will not count.
As soon as reset is released, the timer will start counting. WDI
input pulses as short as 50ns can be detected.
Disable the watchdog function by leaving WDI unconnected
or by three-stating driver connected to WDI.
Manual Reset
The manual-reset input (MR) allows reset to be triggered by a
push button switch. MR has an internal pullup resistor, so it
can be left open when not used.
Power-Fail Comparator
The power-fail comparator can be used for various purposes
because its output and noninverting input are not internally
connected. The inverting input is internally connected to a 1.25V
reference.
Typical Application Circuit
DC Linear
Regulator
Vcc
Supervisory
PFI
Circuit
WDI
P
Vcc
RESET
I/O Line
Interrupt
IN
RESET
PFO
MR
P
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| PT7M7345ZTAE | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| PT7M7809ZTEX | 功能描述:IC SUPERVISOR 2.32V SOT23-3 RoHS:是 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 其它有關文件:STM6905 View All Specifications 標準包裝:1 系列:- 類型:多壓監(jiān)控器 監(jiān)視電壓數目:5 輸出:開路漏極或開路集電極 復位:低有效 復位超時:最小為 140 ms 電壓 - 閥值:2.188V，2.955V，可調，可調，可調 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:8-TSSOP 包裝:Digi-Reel® 產品目錄頁面:1197 (CN2011-ZH PDF) 其它名稱:497-8728-6 |
| PT7M7810STEX | 制造商:Pericom Semiconductor Corporation 功能描述:RESET IC |
| PT7M7811RTBEX | 制造商:Pericom Semiconductor Corporation 功能描述:RESET IC |
| PT7M7811STAEX | 制造商:Pericom Semiconductor Corporation 功能描述:MICROPROCESSOR SUPERVISORY(WATCH DOG,MANUAL RESET,VOLTAGE MO - Tape and Reel |
| PT7M7811STBEX | 功能描述:IC SUPERVISOR 2.93V SOT143-4 RoHS:是 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 其它有關文件:STM6905 View All Specifications 標準包裝:1 系列:- 類型:多壓監(jiān)控器 監(jiān)視電壓數目:5 輸出:開路漏極或開路集電極 復位:低有效 復位超時:最小為 140 ms 電壓 - 閥值:2.188V，2.955V，可調，可調，可調 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:8-TSSOP 包裝:Digi-Reel® 產品目錄頁面:1197 (CN2011-ZH PDF) 其它名稱:497-8728-6 |
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