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參數(shù)資料
| 型號(hào)： | MAX6806 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Octal Buffers And Line Drivers With 3-State Outputs 20-CDIP -55 to 125 |
| 中文描述： | 電壓檢測器 |
| 文件頁數(shù)： | 4/12頁 |
| 文件大?。?/td> | 168K |
| 代理商： | MAX6806 |
M
Voltage Detec tors
4
_______________________________________________________________________________________
_______________Detailed Desc ription
Reset Output
The MAX6806 voltage detector features an active-low,
push-pull
RESET
output, while the MAX6807 features
an active-high, push-pull RESET output. Unlike micro-
processor (μP) supervisory circuits that offer a reset
timeout period, the MAX6806 and MAX6807
RESET
goes high and RESET goes low virtually immediately
once V
CC
exceeds the reset threshold. If a brownout
occurs (V
CC
falls below the reset threshold),
RESET
goes low and RESET goes high.
RESET
is guaranteed
to be a logic low for V
CC
≥
1V and RESET is guaran-
teed to be a logic high for V
CC
≥
1.2V.
The MAX6808 features an active-low, open-drain
RESET
output. The output sinks current when V
CC
falls below
the reset threshold. Connect a pull-up resistor from
RESET
to any supply voltage up to 6V (Figure 1). Select
a resistor value large enough to provide a logic low and
small enough to provide a logic high while supplying all
input and leakage currents connected to the
RESET
line. A 100k
resistor is sufficient in applications driving
high-impedance loads.
The manual reset input (MR, 4-pin SOT143 package)
can also initiate a reset (see Manual Reset Input sec-
tion).
Manual Reset Input
Many applications require manual-reset capabilities,
allowing an operator, a test technician, or external logic
circuitry to initiate a reset. A logic high on MR asserts a
reset and remains asserted while MR is high. This input
has an 80k
pull-down resistor, so the input may be left
unconnected if not used. Connect a normally open
momentary switch from MR to V
CC
to create a manual-
reset function. If MR is driven from long cables or if the
device is used in a noisy environment, connecting a
0.1μF capacitor from MR to ground provides noise
immunity.
Hysteresis
The MAX6806/MAX6807/MAX6808 feature internal hys-
teresis that creates two trip points: one for the rising
supply voltage and one for the falling supply voltage
(Figure 2). The hysteresis prevents the output from oscil-
lating (chattering) when V
CC
is near the reset threshold.
Reset T hreshold Ac c urac y
The MAX6806/MAX6807/MAX6808 are ideal for sys-
tems using a 5V ±5%, 3V ±5%, or 2.5V ±5% power
supply with ICs specified for 5V ±10%, 3V ±10%, or
2.5V ±10%, respectively. The reset is guaranteed to
assert after the power supply falls out of regulation, but
before power drops below the minimum specified oper-
ating voltage range for the system ICs.
MAX6808
V
CC
V
CC
GND
+3.3V
GND
+5.0V
100k
5V SYSTEM
RESET
Figure 1. The MAX6808 open-drain
RESET
output allows use
with multiple supplies.
V
TH+
HYST
RESET
(MAX6806/MAX6808)
RESET
(MAX6807)
V
HYST
= V
TH+
- V
TH-
V
OH
V
OL
V
OH
V
OL
V
TH-
Figure 2. Input and Output Waveforms with V
CC
Varied
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX6806-MAX6808 | Voltage Detectors |
| MAX6806UR23-T | Voltage Detectors |
| MAX6806UR26-T | Octal Buffers And Line Drivers With 3-State Outputs 20-CDIP -55 to 125 |
| MAX6806UR46-T | Octal Buffers And Line Drivers With 3-State Outputs 20-CFP -55 to 125 |
| MAX6808 | Voltage Detectors |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6806SA23 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX6806SA26 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX6806SA46 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX6806UA23 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX6806UA26 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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