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參數(shù)資料
| 型號(hào)： | PI4S809LW |
| 廠商： | PERICOM SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO3 |
| 封裝： | TO-236AB, SOT-23, 3 PIN |
| 文件頁數(shù)： | 2/5頁 |
| 文件大?。?/td> | 463K |
| 代理商： | PI4S809LW |
2
P-0.2
02/24/05
PI4S809/803
P Supervisor Circuits
ADVANCE INFORMATION, COMPANY CONFIDENTIAL
Pin Name
Type
Description
VCC
Power
Power Supply: Reset is asserted when VCC drops below the Reset Threshold Voltage (VRST). Reset
remains asserted until VCC rises abouv VRES and keep asserted for the duration for the Reset Timeout
Period (tRS) once VCC rises above (VRST).
GND
Ground
Ground Reference for all signals
RESET
O
Active-Low Reset Output (Push-Pull or Open-Drain). It goes low when VCC is below the reset
threshold. It remains low for about 200ms after one of the following occurs: VCC rises above the reset
threshold (VRST), the watchdog triggers a reset, or MR goes from low to high.
Pin Description (Table 2.)
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. Figure 4 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.
Storage Temperature ......................................................... -65oC to +150oC
Ambient Temperature with Power Applied ........................ -40oC to +85oC
Supply Voltage to Ground Potential (VCC to GND)............-0.3V to +7.0V
DC Input Voltage (All inputs except VCC and GND) .............-0.3V to VCC+0.3V
DC Output Current (All outputs) ........................................................20mA
Power Dissipation (Depends on package) ..................................... 320mW
Absolute Maximum Ratings
Note:
Stresses greater than those listed under MAXIMUM
RATINGS may cause permanent damage to the device.
This is a stress rating only and functional operation of
the device at these or any other conditions above those
indicated in the operational sections of this specification
is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect reliability.
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