- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384695 > MAX6840XSD3 (Maxim Integrated Products, Inc.) Ultra-Low-Voltage SC70 Voltage Detectors and レP Reset Circuits PDF資料下載
參數(shù)資料
| 型號： | MAX6840XSD3 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Ultra-Low-Voltage SC70 Voltage Detectors and レP Reset Circuits |
| 中文描述： | 超低電壓SC70封裝電壓檢測器和レP復(fù)位電路 |
| 文件頁數(shù)： | 7/11頁 |
| 文件大小： | 197K |
| 代理商： | MAX6840XSD3 |
at RESET-IN allows for relatively large-value resistors to
be used, which reduce power consumption. For exam-
ple, for a 0.6V monitored trip level, if R2 = 200k
, then
R1 = 70.3k
. Note that the minimum V
CC
of 1.1V is
required to guarantee the RESET-IN threshold accura-
cy (see
Electrical Characteristics
table).
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 MAX6832
–
MAX6840 are relatively immune to short-duration nega-
tive-going V
CC
transients (glitches).
Figure 2 shows typical transient duration vs. reset com-
parator overdrive, for which the MAX6832
–
MAX6840 do
not
generate a reset pulse. The graph was generated
using a negative-going pulse applied to V
CC
, starting
0.1V above the actual reset threshold and ending
below it by the magnitude indicated (reset comparator
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 tran-
sient increases (goes farther below the reset threshold),
the maximum allowable pulse width decreases. 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 0.55V, the MAX6832/MAX6835/
MAX6838 push-pull
RESET
output no longer sinks cur-
rent
—
it becomes an open circuit. Therefore, high-
impedance CMOS logic inputs connected to
RESET
can drift to undetermined voltages. This presents no
problem in most applications since most μP and other
circuitry are inoperative with V
CC
lower than 0.55V.
However, in applications where
RESET
must be valid
down to 0, adding a pulldown resistor to
RESET
causes
any stray leakage currents to flow to ground, holding
RESET
low (Figure 3). R3
’
s value is not critical; 100k
is large enough not to load
RESET
and small enough to
pull
RESET
to ground.
A 100k
pullup resistor to V
CC
is also recommended
for the MAX6833/MAX6836/MAX6839 if RESET is
required to remain valid for V
CC
< 0.85V.
Interfacing to μPs with Bidirectional
Reset Pins
Since the
RESET
output on the MAX6834/MAX6837/
MAX6840 is open-drain, these devices interface easily
with μPs that have bidirectional reset pins. Connecting
the μP supervisor
’
s
RESET
output directly to the μP
’
s
RESET
pin with a single pullup resistor allows either
device to assert a reset (Figure 4).
M
Ultra-Low-Voltage SC70 Voltage Detectors
and μP Reset Circuits
_______________________________________________________________________________________
7
0
200
300
400
500
600
700
800
900
1
10
100
MAXIMUM TRANSIENT DURATION
vs. OVERDRIVE
OVERDRIVE V
TH
- V
CC
(mV)
M
μ
s
100
RESET OCCURS
ABOVE THIS
LINE
Figure 2. Maximum Transient Duration Without Causing a
Reset Pulse vs. Reset Comparator Overdrive
R3
100k
V
CC
GND
MAX6832
MAX6835
MAX6838
RESET
Figure 3.
RESET
Valid to V
CC
= Ground Circuit
RESET
GND
RESET
INPUT
MAX6834
MAX6837
MAX6840
BIDIRECTIONAL
μ
P
GND
V
CC
V
CC
V
CC
Figure 4. Interfacing to μPs with Bidirectional Reset I/O
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX6840XSD3-T | Ultra-Low-Voltage SC70 Voltage Detectors and レP Reset Circuits |
| MAX6877ETG | Dual-/Triple-Voltage, Power-Supply Trackers/Sequencers/Supervisors |
| MAX6878 | 4-Bit Bistable Latches 16-CDIP -55 to 125 |
| MAX6878ETG* | Dual-/Triple-Voltage, Power-Supply Trackers/Sequencers/Supervisors |
| MAX6879 | Dual-/Triple-Voltage, Power-Supply Trackers/Sequencers/Supervisors |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6840XSD3+ | 制造商:Maxim Integrated Products 功能描述:MAXIM INTEGRATED PRODUCTS MAX6840XSD3+ SUPERVISORS - Tape and Reel 制造商:Maxim Integrated Products 功能描述:Maxim Integrated Products MAX6840XSD3+ Supervisors |
| MAX6840XSD3+T | 功能描述:監(jiān)控電路 Single 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 |
| MAX6840XSD3-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 |
| MAX6840XSD4 | 制造商:Maxim Integrated Products 功能描述:ULTRA-LOW-VOLTAGE SC70 VOLTAGE DET - Cut Tape Product |
| MAX6840XSD4+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR ADJV 16UA 4PIN SC-70 - Cut Tape Product |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。