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參數(shù)資料
| 型號(hào)： | MAX6307UK31D3-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 5-Pin, Multiple-Input, Programmable Reset ICs |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封裝： | MO-178AA, SOT-23, 5 PIN |
| 文件頁數(shù)： | 7/16頁 |
| 文件大小： | 104K |
| 代理商： | MAX6307UK31D3-T |
M
5-Pin, Multiple-Input,
Programmable Reset ICs
_______________________________________________________________________________________
7
The ±25nA max input leakage current allows resistors on
the order of megohms. Choose the pull-up resistor in the
divider to minimize the error due to the input leakage cur-
rent. The error term in the calculated threshold is simply:
±25nA x R1
If you choose R1 to be 1M
, the resulting error is
±25 x 10
-9
x 1 x 10
6
= ±25mV.
Like the V
CC
voltage monitors on the MAX6306/MAX6307/
MAX6309/MAX6310/MAX6312/MAX6313, the RST IN_
inputs (when used with a voltage divider) are designed to
ignore fast voltage transients. Increase the noise immunity
by connecting a capacitor on the order of 0.1μF between
RST IN and GND (Figure 2). This creates a single-pole
lowpass filter with a corner frequency given by:
f = (1/2
π
) / (R1 + R2)(R1 x R2 x C)
For example, if R1 = 1M
and R2 = 1.6M
, adding a
0.1μF capacitor from RST IN_ to ground results in a
lowpass corner frequency of f = 2.59Hz. Note that
adding capacitance to RST IN slows the circuit’s overall
response time.
__________Applic ations Information
Interfac ing to μPs with
Bidirec tional Reset Pins
Since the
RESET
output on the MAX6305/MAX6306/
MAX6307 is open drain, these devices interface easily
with μPs that have bidirectional reset pins, such as the
Motorola 68HC11. Connecting the μP supervisor’s
RESET
output directly to the microcontroller’s
RESET
pin with a single pull-up resistor allows either device to
assert reset (Figure 3).
Negative-Going V
CC
T ransients
In addition to issuing a reset to the μP during power-up,
power-down, and brownout conditions, these devices
are relatively immune to short-duration, negative-going
V
CC
transients (glitches).
The Typical Operating Characteristics show the
Maximum Transient Duration vs. V
CC
Reset Threshold
Overdrive, for which reset pulses are not generated.
The graph was produced using negative-going pulses,
starting at V
TH
max, and ending below the pro-
grammed reset threshold by the magnitude indicated
(reset threshold overdrive). The graph shows the maxi-
mum pulse width that a negative-going V
CC
transient
may typically have without causing a reset pulse to be
issued. As the amplitude of the transient increases (i.e.,
goes farther below the reset threshold), the maximum
allowable pulse width decreases.
RST IN_/OVRST IN are also immune to negative/positive-
going transients (see Typical Operating Characteristics).
A 0.1μF bypass capacitor mounted close to the RST IN_,
OVRST IN, and/or the V
CC
pin provides additional tran-
sient immunity.
Ensuring a V alid
RESET
/RES ET
Output Down to V
CC
= 0V
When V
CC
falls below 1V, push/pull structured
RESET
/
RESET current sinking (or sourcing) capabilities
decrease drastically. High-impedance CMOS-logic
inputs connected to
RESET
can drift to undetermined
voltages. This presents no problem in most applica-
tions, since most μPs and other circuitry do not operate
with V
CC
below 1V. In those applications where
RESET
must be valid down to 0V, adding a pull-down resistor
between
RESET
and ground sinks any stray leakage
Figure 2. Increasing Noise Immunity
MAX6305–
MAX6313
RST IN_
C*
V
IN
R1
R2
GND
*FOR ADDITIONAL NOISE IMMUNITY
V
CC
V
TH
=
(
)
V
RSTH
R3
R1 + R2
*
C
=
(
)
R1
x
R2
x
C
R1 + R2
1
2
π
Figure 3. Interfacing to μPs with Bidirectional Reset I/O
MAX6305
MAX6306
MAX6307
RESET
GENERATOR
GND
GND
V
CC
V
CC
RESET
RESET
μ
P
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6307UK31D4 | 制造商:Maxim Integrated Products 功能描述:5-PIN MULTIPLE-INPUT PROGRAMMABLE - Rail/Tube |
| MAX6307UK31D4+T | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX6307UK31D4T | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Voltage Detector |
| MAX6307UK31D4-T | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX6307UK32D1 | 制造商:Maxim Integrated Products 功能描述:5-PIN MULTIPLE-INPUT PROGRAMMABLE - Rail/Tube |
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