|
|
PDF MAX6418UK22-T Data sheet ( Hoja de datos )
| Número de pieza | MAX6418UK22-T | |
| Descripción | Low-Power / Single/Dual-Voltage uP Reset Circuits with Capacitor-Adjustable Reset Timeout Delay | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MAX6418UK22-T (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
|
No Preview Available !
19-2336; Rev 1; 8/03
Low-Power, Single/Dual-Voltage µP Reset Circuits
with Capacitor-Adjustable Reset Timeout Delay
General Description
The MAX6412–MAX6420 low-power microprocessor
supervisor circuits monitor system voltages from 1.6V to
5V. These devices are designed to assert a reset signal
whenever the VCC supply voltage or RESET IN falls below
its reset threshold or the manual reset input is asserted.
The reset output remains asserted for the reset timeout
period after VCC and RESET IN rise above the reset
threshold and the manual reset input is deasserted. The
reset timeout is externally set by a capacitor to provide
more flexibility.
The MAX6412/MAX6413/MAX6414 feature fixed thresholds
from 1.575V to 5V in approximately 100mV increments and
a manual reset input. The MAX6415/MAX6416/MAX6417
are offered with an adjustable reset input that can monitor
voltages down to 1.26V and the MAX6418/MAX6419/
MAX6420 are offered with one fixed input and one
adjustable input to monitor dual-voltage systems.
The MAX6412/MAX6415/MAX6418 have an active-low,
push-pull reset output. The MAX6413/MAX6416/
MAX6419 have an active-high, push-pull reset output
and the MAX6414/MAX6417/MAX6420 have an active-
low, open-drain reset output. All of these devices are
offered in a SOT23-5 package and are fully specified
from -40°C to +125°C.
Applications
Automotive
Medical Equipment
Intelligent Instruments
Portable Equipment
Battery-Powered Computers/Controllers
Embedded Controllers
Critical µP Monitoring
Set-Top Boxes
Computers
Pin Configuration
TOP VIEW
RESET/RESET 1
5 VCC
MAX6412–
GND 2 MAX6420
RESET IN (MR) 3
4 SRT
SOT23-5
( ) FOR THE MAX6412/MAX6413/MAX6414.
Features
o Monitor System Voltages from 1.6V to 5V
o Capacitor-Adjustable Reset Timeout Period
o Manual Reset Input (MAX6412/MAX6413/MAX6414)
o Adjustable Reset Input Option
(MAX6415–MAX6420)
o Dual-Voltage Monitoring
(MAX6418/MAX6419/MAX6420)
o Low Quiescent Current (1.7µA, typ)
o 3 RESET Output Options
Push-Pull RESET
Push-Pull RESET
Open-Drain RESET
o Guaranteed Reset Valid to VCC = 1V
o Power-Supply Transient Immunity
o Small SOT23-5 Packages
Ordering Information
PART
MAX6412UK_ _-T
MAX6413UK_ _-T
MAX6414UK_ _-T
MAX6415UK-T
MAX6416UK-T
MAX6417UK-T
MAX6418UK_ _-T
MAX6419UK_ _-T
MAX6420UK_ _-T
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
5 SOT23-5
5 SOT23-5
5 SOT23-5
5 SOT23-5
5 SOT23-5
5 SOT23-5
5 SOT23-5
5 SOT23-5
5 SOT23-5
Note: The MAX6412/MAX6413/MAX6414 and MAX6418/
MAX6419/MAX6420 are available with factory-set VCC reset
thresholds from 1.575V to 5.0V in approximately 0.1V incre-
ments. Insert the desired nominal reset threshold suffix (from
Table 1) into the blanks following the letters UK. There are 33
standard versions with a required order increment of 2500
pieces. Sample stock is generally held on standard versions
only (see Standard Versions Table). Required order increment is
10,000 pieces for nonstandard versions. Contact factory for
availability. All devices are available in tape-and-reel only.
Typical Operating Circuit appears at end of data sheet.
Selector Guide appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
Low-Power, Single/Dual-Voltage µP Reset Circuits
with Capacitor-Adjustable Reset Timeout Delay
MAX6412/
MAX6413/
MAX6414
PIN
MAX6415/
MAX6416/
MAX6417
MAX6418/
MAX6419/
MAX6420
111
22
—3
2
3
3 ——
444
555
NAME
RESET
RESET
GND
RESET
IN
MR
SRT
VCC
Pin Description
FUNCTION
RESET changes from high to low whenever VCC or RESET IN drops below
the selected reset threshold voltage (VTH or VRESET IN, respectively) or
manual reset is pulled low. RESET remains low for the reset timeout period
after all reset conditions are deasserted and then goes high.
RESET changes from low to high whenever the VCC or RESET IN drops
below the selected reset threshold voltage (VTH or VRESET IN) or manual
reset is pulled low. RESET remains high for the reset timeout period after all
reset conditions are deasserted and then goes low.
Ground
Reset Input. High-impedance input to the adjustable reset comparator.
Connect RESET IN to the center point of an external resistor-divider
network to set the threshold of the externally monitored voltage. See Reset
Threshold section.
Manual Reset Input. Pull this pin low to manually reset the device. Reset
remains asserted for the reset timeout period after MR is released.
Set Reset Timeout Input. Connect a capacitor between SRT and ground to
set the timeout period. Determine the period as follows:
tRP = (2.73 x 106) ✕ CSRT + 275µs with tRP in seconds and CSRT in Farads.
Supply Voltage and Input for Fixed-Threshold VCC Monitor
Detailed Description
The MAX6412–MAX6420 low-power microprocessor
(µP) supervisory circuits provide maximum adjustability
for supply-voltage monitoring and reset functionality. In
addition, the MAX6412–MAX6420 reset timeout period
is adjustable using an external capacitor.
The MAX6412/MAX6413/MAX6414 have factory-
trimmed reset threshold voltages in approximately
100mV increments from 1.575V to 5.0V with a manual
reset input. The MAX6415/MAX6416/MAX6417 contain
a reset threshold that can be adjusted to any voltage
above 1.26V using external resistors. The MAX6418/
MAX6419/MAX6420 offer both a factory-trimmed reset
threshold and an adjustable reset threshold input for
dual-voltage monitoring.
A reset signal is asserted when VCC and/or RESET IN
falls below the preset values or when MR is asserted.
The reset remains asserted for an externally pro-
grammed interval after VCC and/or RESET IN has risen
above the reset threshold or MR is deasserted.
Reset Output
The reset output is typically connected to the reset
input of a µP. A µP’s reset input starts or restarts the µP
in a known state. The MAX6412–MAX6420 µP supervi-
sory circuits provide the reset logic to prevent code-
execution errors during power-up, power-down, and
brownout conditions (see Typical Operating Circuit).
For the MAX6413, MAX6416, and MAX6419, RESET
changes from low to high whenever VCC or RESET IN
drops below the reset threshold voltages. Once RESET
IN and VCC exceed their respective reset threshold volt-
age(s), RESET remains high for the reset timeout period,
then goes low.
On power-up, once VCC reaches 1V, RESET is guaran-
teed to be a logic high. For applications requiring valid
reset logic when VCC is less than 1V, see the section
Ensuring a Valid RESET/RESET Output Down to VCC = 0.
The active-low RESET output of the remaining supervi-
sors is the inverse of the MAX6413, MAX6416, and
MAX6419 active-high RESET output and is guaranteed
valid for VCC ≥ 1V.
Reset Threshold
The MAX6415–MAX6420 monitor the voltage on RESET
IN with an external resistor voltage-divider (Figure 1).
_______________________________________________________________________________________ 5
5 Page 
Low-Power, Single/Dual-Voltage µP Reset Circuits
with Capacitor-Adjustable Reset Timeout Delay
PART
MAX6412
MAX6413
MAX6414
MAX6415
MAX6416
MAX6417
MAX6418
MAX6419
MAX6420
FIXED
VTH
✔
✔
✔
—
—
—
✔
✔
✔
MANUAL
RESET
✔
✔
✔
—
—
—
—
—
—
RESET IN
—
—
—
✔
✔
✔
✔
✔
✔
PUSH-PULL
RESET
✔
—
—
✔
—
—
✔
—
—
Selector Guide
PUSH-PULL
RESET
—
✔
—
—
✔
—
—
✔
—
OPEN-DRAIN
RESET
—
—
✔
—
—
✔
—
—
✔
Typical Operating Circuit
VCC
VCC
RESET/RESET
RESET/RESET
MAX6412
MAX6413
MR MAX6414
GND SRT
µP
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX6418UK22-T.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MAX6418UK22-T | Low-Power / Single/Dual-Voltage uP Reset Circuits with Capacitor-Adjustable Reset Timeout Delay | Maxim Integrated |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |