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PDF MAX6405 Data sheet ( Hoja de datos )
| Número de pieza | MAX6405 | |
| Descripción | P Supervisory Circuits in 4-Bump (2 x 2) Chip-Scale Package | |
| Fabricantes | Maxim Integrated | |
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19-2043; Rev 1; 8/01
µP Supervisory Circuits in 4-Bump (2 ✕ 2)
Chip-Scale Package
General Description
The MAX6400–MAX6405 is a family of ultra-low power
microprocessor (µP) supervisory circuits used for moni-
toring battery, power-supply, and regulated system
voltages. Each device contains a precision bandgap
reference comparator and is trimmed to specified trip
threshold voltages. These devices provide excellent cir-
cuit reliability and low cost by eliminating external com-
ponents and adjustments when monitoring system
voltages from 2.5V to 5.0V. A manual reset input is also
included.
The MAX6400–MAX6405 assert a reset signal whenev-
er the VCC supply voltage falls below a preset thresh-
old. These devices are differentiated by their output
logic configurations and preset threshold voltages. The
MAX6400/MAX6403 (push-pull) and the MAX6402/
MAX6405 (open-drain) have an active-low reset (RESET
is logic low when VCC is below VTH). The MAX6401/
MAX6404 have an active-high push-pull output (RESET
is logic high when VCC is below VTH). All parts are
guaranteed to be in the correct output logic state for
VCC down to 1V. The reset circuit is designed to ignore
fast transients on VCC. The MAX6400/MAX6401/
MAX6402 have voltage thresholds between 2.20V and
3.08V in approximately 100mV increments. The
MAX6403/MAX6404/MAX6405 have voltage thresholds
between 3.30V and 4.63V in approximately 100mV
increments.
Ultra-low supply current of 500nA (MAX6400/MAX6401/
MAX6402) makes these parts ideal for use in portable
equipment. These devices are available in 4-bump
chip-scale packages (UCSP™)
Applications
Portable/Battery-Powered Equipment
Cell Phones
PDAs
MP3 Players
Pagers
Selector Guide
____________________________Features
o Ultra-Small 4-Bump (2 ✕ 2) Chip-Scale Package,
(Package Pending Full Qualification—Expected
Completion Date 6/30/01. See UCSP Reliability
Section for More Details.)
o 70% Smaller Than SC70 Package
o Ultra-Low 500nA (typ) Supply Current
(MAX6400/MAX6401/MAX6402)
o Factory-Trimmed Reset Thresholds from 2.20V to
4.63V in Approximately 100mV Increments
o ±2.5% Threshold Accuracy -40°C to +85°C
o Factory-Set 100ms (min) Reset Timeout Period
o Manual Reset Input
o Guaranteed Reset Valid to VCC = 1.0V
o Three Reset Output Logic Options: Active-Low
Push-Pull, Active-High Push-Pull, and Active-Low
Open-Drain.
o Immune to Short VCC Transients
o No External Components
Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
MAX6400BS_ _-T -40oC to +85oC
UCSP-4
MAX6401BS_ _-T -40oC to +85oC
UCSP-4
MAX6402BS_ _-T -40oC to +85oC
UCSP-4
MAX6403BS_ _-T -40oC to +85oC
UCSP-4
MAX6404BS_ _-T -40oC to +85oC
UCSP-4
MAX6405BS_ _-T -40oC to +85oC
UCSP-4
The MAX6400–MAX6405 are available in factory-set VCC reset
thresholds from 2.20V to 4.63V, in approximately 0.1V incre-
ments. Choose the desired reset-threshold suffix from Table 1
and insert it in the blank space following “S”. There are 21 stan-
dard versions with a required order increment of 2500 pieces.
Sample stock is generally held on the standard versions only
(Table 1). Required order increment is 10,000 pieces for non-
standard versions (Table 2). Contact factory for availability. All
devices available in tape-and-reel only.
PART
MAX6400
MAX6401
MAX6402
MAX6403
MAX6404
MAX6405
NOMINAL
VTH (V)
2.20 to 3.08
2.20 to 3.08
2.20 to 3.08
3.30 to 4.63
3.30 to 4.63
3.30 to 4.63
RESET/RESET
OUTPUT TYPE
Push-Pull, Active-Low
Push-Pull, Active-High
Open-Drain, Active-Low
Push-Pull, Active-Low
Push-Pull, Active-High
Open-Drain, Active-Low
UCSP reliability is integrally linked to the user’s assembly
methods, circuit board material, and environment. Refer to the
UCSP Reliability Notice in the UCSP Reliability section of this
data sheet for more information.
Pin Configuration appears at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________ 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  
µP Supervisory Circuits in 4-Bump (2 ✕ 2)
Chip-Scale Package
PIN
MAX6400/MAX6402
MAX6403/MAX6405
MAX6401/MAX6404
A1 A1
B1 —
— B1
B2 B2
A2 A2
NAME
GND
RESET
RESET
MR
VCC
Pin Description
FUNCTION
Ground
Active-Low Reset Output, (Open-Drain or Push-Pull). RESET
is asserted low when the VCC input is below the selected
reset threshold. RESET remains low for the reset timeout
period after VCC exceeds the device reset threshold. Open-
drain outputs require an external pullup resistor.
Active-High Reset Output. RESET remains high while VCC is
below the reset threshold and for at least 100ms after VCC
rises above the reset threshold.
Active-Low Manual Reset. Internal 50kΩ pullup to VCC. Pull
low to assert a reset. Reset remains asserted as long as MR
is low and for the reset timeout period after MR goes high.
Leave unconnected or connect to VCC if unused.
Supply Voltage and Input for the Reset Threshold Monitor
Detailed Description
Reset Output
A microprocessor’s (µP’s) reset input starts the µP in a
known state. These µP supervisory circuits assert reset
to prevent code execution errors during power-up,
power-down, or brownout conditions.
RESET is guaranteed to be a logic low for VCC down to
1V. Once VCC exceeds the reset threshold, an internal
timer keeps RESET low for the reset timeout period;
after this interval, RESET goes high.
If a brownout condition occurs (VCC dips below the
reset threshold), RESET goes low. Any time VCC goes
below the reset threshold, the internal timer resets to
zero, and RESET goes low. The internal timer starts
after VCC returns above the reset threshold, and RESET
remains low for the reset timeout period.
The manual reset input (MR) can also initiate a reset,
see the Manual Reset Input section. The MAX6401/
MAX6404 have active-high RESET outputs that are the
inverse of the MAX6400/MAX6402/MAX6403/MAX6405
outputs (Figure 1).
Manual Reset Input
Many µP-based products require manual reset capabil-
ity, allowing the operator, a test technician, or external
logic circuit to initiate a reset. A logic low on MR asserts
reset. Reset remains asserted while MR is low, and for
the reset active timeout period (tRP) after MR returns
high. This input has an internal 50kΩ pullup resistor, so
it can be left open if it is not used. MR can be driven
with TTL or CMOS logic levels, or with open-drain/col-
lector outputs. Connect a normally open momentary
switch from MR to GND to create a manual reset func-
tion; external debouncing circuitry is not required. If MR
is driven from long cables or if the device is used in a
noisy environment, connect a 0.1µF capacitor from MR
to ground to provide additional noise immunity (see
Figure 1).
Applications Information
Interfacing to µP with Bidirectional
Reset Pins
Since the RESET output on the MAX6402/MAX6405 is
open-drain, these devices interface easily with (µPs)
that have bidirectional reset pins. Connecting the µP
supervisor’s RESET output directly to the microcon-
troller’s (µC’s) RESET pin with a single pullup resistor
allows either device to assert reset (Figure 2).
Negative-Going VCC Transients
These devices are relatively immune to short-duration,
negative-going VCC transients (glitches).
The Typical Operating Characteristics show the
Maximum Transient Duration vs. Reset Threshold
Overdrive graph, for which reset pulses are not gener-
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet MAX6405.PDF ] | |
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