- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383508 > MAX810R (Maxim Integrated Products, Inc.) AC/DC CAPACITANCE=3 VOLT=2000 RoHS Compliant: Yes PDF資料下載
參數(shù)資料
| 型號： | MAX810R |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | AC/DC CAPACITANCE=3 VOLT=2000 RoHS Compliant: Yes |
| 中文描述： | 3引腳微處理器復(fù)位電路 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 136K |
| 代理商： | MAX810R |
M
_______________________________________________________________________________________
5
Detailed Description
A microprocessor’s (μP’s) reset input starts the μP in a
known state. The MAX803/MAX809/MAX810 assert
reset to prevent code-execution errors during power-
up, power-down, or brownout conditions. They assert a
reset signal whenever the V
CC
supply voltage declines
below a preset threshold, keeping it asserted for at
least 140ms after V
CC
has risen above the reset thresh-
old. The MAX803 uses an open-drain output, and the
MAX809/MAX810 have a push-pull output stage.
Connect a pull-up resistor on the MAX803’s
RESET
out-
put to any supply between 0 and 6V.
Applications Information
Negative-Going V
CC
Transients
In addition to issuing a reset to the μP during power-up,
power-down, and brownout conditions, the MAX803/
MAX809/MAX810 are relatively immune to short-duration
negative-going V
CC
transients (glitches).
Figure 1 shows typical transient duration vs. reset com-
parator overdrive, for which the MAX803/MAX809/
MAX810 do
not
generate a reset pulse. The graph was
generated using a negative-going pulse applied to V
CC
,
starting 0.5V above the actual reset threshold and end-
ing below it by the magnitude indicated (reset compara-
tor overdrive). The graph indicates the maximum pulse
width a negative-going V
CC
transient can have without
causing a reset pulse. As the magnitude of the transient
increases (goes farther below the reset threshold), the
maximum allowable pulse width decreases. Typically, for
the MAX8__L and MAX8__M, a V
CC
transient that goes
100mV below the reset threshold and lasts 20μs or less
will not cause a reset pulse. A 0.1μF bypass capacitor
mounted as close as possible to the V
CC
pin provides
additional transient immunity.
Ensuring a Valid Reset Output
Down to V
CC
= 0
When V
CC
falls below 1V, the MAX809
RESET
output
no longer sinks current—it becomes an open circuit.
Therefore, high-impedance CMOS logic inputs con-
nected to
RESET
can drift to undetermined voltages.
This presents no problem in most applications since
most μP and other circuitry is inoperative with V
CC
below 1V. However, in applications where
RESET
must
be valid down to 0V, adding a pull-down resistor to
RESET
causes any stray leakage currents to flow to
3-Pin Microprocessor Reset Circuits
R1
100k
V
CC
GND
MAX809
RESET
Figure 2.
RESET
Valid to V
CC
= Ground Circuit
2
RESET
(MAX803/
MAX809)
RESET
Output remains low while V
CC
is below the reset threshold, and for at
least 140ms after V
CC
rises above the
reset threshold.
1
GND
Ground
PIN
NAME
FUNCTION
RESET
(MAX810)
RESET Output remains high while V
CC
is below the reset threshold, and for at
least 140ms after V
CC
rises above the
reset threshold.
_____________________Pin Description
400
320
0
1
100
1000
160
80
240
RESET COMPARATOR OVERDRIVE, V
TH
- V
CC
(mV)
M
μ
s
10
T
A
= +25
°
C
MAX8_ _J/L/M
MAX8_ _R/S/T/Z
Figure 1. Maximum Transient Duration Without Causing a
Reset Pulse vs. Reset Comparator Overdrive
3
V
CC
Supply Voltage (+5V, +3.3V, +3.0V, or
+2.5V)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX810REUR-T | 3-Pin Microprocessor Reset Circuits |
| MAX810REUR-T10 | 3-Pin Microprocessor Reset Circuits |
| MAX810REXR-T | 3-Pin Microprocessor Reset Circuits |
| MAX810REXR-T10 | 3-Pin Microprocessor Reset Circuits |
| MAX810TEXR-T | 3-Pin Microprocessor Reset Circuits |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX810RCPA | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Voltage Detector |
| MAX810RCUR | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Voltage Detector |
| MAX810RD | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:3-pin microprocessor resets |
| MAX810REUR | 制造商:Maxim Integrated Products 功能描述:3-PIN MICROPROCESSOR RESET CIRCUIT - Rail/Tube |
| MAX810REUR+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 2.63V 17UA 3PIN SOT-23 - Rail/Tube 制造商:Maxim Integrated Products 功能描述:Processor Supervisor 2.63V 17uA 3-Pin SOT-23 制造商:Maxim Integrated Products 功能描述:Processor Supervisor 2.63V 17uA 3-Pin SOT-23 Bulk |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。