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參數(shù)資料
| 型號： | MAX6392KA46 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Dual-Voltage uP Supervisory Circuits with Sequenced Reset Outputs |
| 中文描述： | 雙電壓監(jiān)控電路的連續(xù)復(fù)位輸出 |
| 文件頁數(shù)： | 7/9頁 |
| 文件大?。?/td> | 170K |
| 代理商： | MAX6392KA46 |
M
Dual-Voltage μP Supervisory Circuits
with Sequenced Reset Outputs
_______________________________________________________________________________________
7
Applications Information
Selecting the Reset Timeout Capacitor
The
RESET2
delay may be adjusted by the user with an
external capacitor connected from the CSRT pin to
ground. The MAX6391 includes a 600nA current source
that is switched to C
CSRT
to create a voltage ramp. The
voltage ramp is compared to the internal 1.25V refer-
ence to set the
RESET2
delay period. The period is cal-
culated by:
t = C
V/I
where
V = 1.25V, I = 600nA, and C is the external
capacitor.
Simplifying,
t
RP
= 2.08
10
6
s / F
C
CSRT
For C
CSRT
= 1500pF, t
RP
= 3.1ms
A fixed internal 140ms (min) reset delay time for
RESET2
may be chosen by connecting the CSRT pin to
V
CC
. The V
CC
to CSRT connection disables the voltage
ramp and enables a separate fixed delay counter
chain. The MAX6391 internally determines the CSRT
connection and provides the proper timing setup.
In all cases, RESET IN2 acts as the slave supply. V
CC
can assert the
RESET2
output but RESET IN2 will have
no effect on the
RESET1
output.
Monitoring Voltages Other Than V
CC
An external resistive-divider network is required at
RESET IN2 for most applications. The divider resistors,
R3 and R4, may be calculated by the following formula:
V
RST
= V
TH2
(R3 + R4)/R4
where V
TH2
= 625mV (internal reference voltage) and
V
RST
is the desired reset threshold voltage. R4 may be
set to a conveniently high value (500k
for example, to
minimize current consumption) and the equation may
be solved for R3 by:
R3 = R4
(V
RST
/V
TH2
- 1)
For single-supply operations requiring two reset out-
puts (
RESET1
before
RESET2
), connect RESET IN2
directly to V
CC
and adjust
RESET2
timeout delay with
C
CRST
as desired.
Pullup Resistors
The MAX6391 includes open-drain outputs for both
RESET1
and
RESET2
. Two internal resistors, R1 and
R2, of 47k
each are provided with internal connec-
tions to
RESET1
and
RESET2
. These resistors may be
connected to the appropriate external voltage for inde-
pendent V
OH
drive with no additional component
requirements.
The MAX6392 includes a manual reset option,
MR
, that
replaces the R1 pullup resistor. The active-low manual
reset input forces both
RESET1
and
RESET2
low.
RESET2
is driven active before
RESET1
in all cases
(10μs typ). The resets follow standard reset timing
specifications after the manual reset is released. The
manual reset is internally pulled up to V
CC
through a
47k
resistor.
Negative-Going V
CC
Transients
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
or RESET IN2 transients (glitches). The
Typical
Operating Characteristics
show the Maximum Transient
Duration vs. Reset Comparator Overdrive graph. The
graph shows the maximum pulse width that a negative-
going V
CC
transient may typically have without issuing
a reset signal. As the amplitude of the transient increas-
es, the maximum allowable pulse width decreases.
PART NUMBER
NOMINAL
THRESHOLD (V)
TOP MARK
MAX6391KA
46
MAX6391KA44
MAX6391KA31
MAX6391KA
29
MAX6391KA26
MAX6391KA
23
MAX6391KA22
MAX6391KA17
MAX6391KA
16
MAX6392KA
46
MAX6392KA44
MAX6392KA31
MAX6392KA
29
MAX6392KA26
MAX6392KA
23
MAX6392KA22
MAX6392KA17
MAX6392KA
16
Standard versions in bold face. Samples are typically available
for standard versions. Contact factory for availability.
4.63
4.38
3.08
2.93
2.63
2.32
2.19
1.67
1.58
4.63
4.38
3.08
2.93
2.63
2.32
2.19
1.67
1.58
AAHJ
AAHK
AAHL
AAHM
AAHN
AAHO
AAHP
AAHQ
AAHR
AAHS
AAHT
AAHU
AAHV
AAHW
AAHX
AAHY
AAHZ
AAIA
Selector Guide
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX6391KA16 | Dual-Voltage uP Supervisory Circuits with Sequenced Reset Outputs |
| MAX6391KA17 | Dual-Voltage uP Supervisory Circuits with Sequenced Reset Outputs |
| MAX6391KA22 | Dual-Voltage uP Supervisory Circuits with Sequenced Reset Outputs |
| MAX6391KA23 | Dual-Voltage uP Supervisory Circuits with Sequenced Reset Outputs |
| MAX6391KA26 | Dual-Voltage uP Supervisory Circuits with Sequenced Reset Outputs |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6392KA46+ | 制造商:Maxim Integrated Products 功能描述:MAXIM MAX6392KA46+ PROCESSOR SUPERVISORS - Tape and Reel 制造商:Maxim Integrated Products 功能描述:Maxim MAX6392KA46+ Processor Supervisors |
| MAX6392KA46+T | 功能描述:監(jiān)控電路 Dual uPower Reset Circuit RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 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 |
| MAX6392KA46-T | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 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 |
| MAX6394US240D1+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX6394US240D1+T | 功能描述:監(jiān)控電路 MPU Reset Circuit 2.4V RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 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 |
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