19-2043; Rev 1; 8/01
µP Supervisory Circuits in 4-Bump (2 ✕ 2)
Chip-Scale Package
General Description
____________________________Features
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.
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
The MAX6400–MAX6405 assert a reset signal whenev-
o
2.5% Threshold Accuracy -40ꢀC to ꢁ+5ꢀC
er the V
supply voltage falls below a preset thresh-
CC
o Factory-Set 100ms (min) Reset Timeout Period
o Manual Reset Input
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
o Guaranteed Reset Valid to V
= 1.0V
CC
o Three Reset Output Logic Options: Active-Low
Push-Pull, Active-High Push-Pull, and Active-Low
Open-Drain.
is logic low when V
is below V ). The MAX6401/
TH
CC
MAX6404 have an active-high push-pull output (RESET
is logic high when V is below V ). All parts are
CC
TH
guaranteed to be in the correct output logic state for
o Immune to Short V
Transients
CC
V
down to 1V. The reset circuit is designed to ignore
CC
o No External Components
fast transients on V . The MAX6400/MAX6401/
CC
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.
Ordering Information
PART
TEMP. RANGE
-40oC to +85oC
-40oC to +85oC
-40oC to +85oC
-40oC to +85oC
-40oC to +85oC
-40oC to +85oC
PIN-PACKAGE
MAX6400BS_ _-T
MAX6401BS_ _-T
MAX6402BS_ _-T
MAX6403BS_ _-T
MAX6404BS_ _-T
MAX6405BS_ _-T
UCSP-4
UCSP-4
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™)
UCSP-4
UCSP-4
UCSP-4
UCSP-4
Applications
Portable/Battery-Powered Equipment
The MAX6400–MAX6405 are available in factory-set V reset
CC
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.
Cell Phones
PDAs
MP3 Players
Pagers
Selector Guide
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.
NOMINAL
(V)
RESET/RESET
OUTPUT TYPE
PART
V
TH
MAX6400
MAX6401
MAX6402
MAX6403
MAX6404
MAX6405
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
Push-Pull, Active-Low
Push-Pull, Active-High
Open-Drain, Active-Low
Push-Pull, Active-Low
Push-Pull, Active-High
Open-Drain, Active-Low
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.
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