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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 V
CC
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 V
CC
is below V
TH
). The MAX6401/
MAX6404 have an active-high push-pull output (RESET
is logic high when V
CC
is below V
TH
). All parts are
guaranteed to be in the correct output logic state for
V
CC
down to 1V. The reset circuit is designed to ignore
fast transients on V
CC
. 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™)
____________________________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 V
CC
= 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 V
CC
Transients
o
No External Components
MAX6400–MAX6405
Ordering Information
PART
MAX6400BS_
_-T
MAX6401BS_
_-T
MAX6402BS_
_-T
MAX6403BS_
_-T
MAX6404BS_
_-T
MAX6405BS_
_-T
TEMP. RANGE
-40 C to +85 C
-40
o
C to +85
o
C
-40 C to +85 C
-40 C to +85 C
-40
o
C to +85
o
C
-40 C to +85 C
o
o
o
o
o
o
o
o
PIN-PACKAGE
UCSP-4
UCSP-4
UCSP-4
UCSP-4
UCSP-4
UCSP-4
Applications
Portable/Battery-Powered Equipment
Cell Phones
PDAs
MP3 Players
Pagers
Selector Guide
PART
MAX6400
MAX6401
MAX6402
MAX6403
MAX6404
MAX6405
NOMINAL
V
TH
(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
The MAX6400–MAX6405 are available in factory-set V
CC
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.
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.
1
________________________________________________________________
Maxim Integrated Products
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.
µP Supervisory Circuits in 4-Bump (2
✕
2)
Chip-Scale Package
MAX6400–MAX6405
ABSOLUTE MAXIMUM RATINGS
All voltages measured with respect to GND, unless otherwise noted.
V
CC
...........................................................................-0.3V to +6V
RESET,
RESET
(push-pull) .........................-0.3V to (V
CC
+ 0.3V)
RESET
(open-drain)..................................................-0.3V to +6V
MR
..............................................................-0.3V to (V
CC
+ 0.3V)
Input/Output into Any Pin ....................................................20mA
Continuous Power Dissipation (T
A
= +70°C)
4-Bump UCSP (derate 3.8mW/°C above +70°C).........303mW
Operating Temperature Range ..........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range ............................-65°C to +150°C
Bump Reflow Temperature .............................................+235°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
CC
= 1.0V to 5.5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
CC
= 3.0V and T
A
= +25°C.) (Note 1)
PARAMETER
Supply Voltage Range
SYMBOL
V
CC
CONDITIONS
T
A
= 0°C to +70°C
T
A
= -40°C to +85°C
MAX6400/MAX6401/MAX6402
V
CC
= 3.0V for V
TH
≤
2.93V,
V
CC
= 3.2V for V
TH
≥
2.93V, no load
V
CC
= 5.5V, no load
Reset Threshold
Reset Threshold Hysteresis
Reset Threshold Tempco
V
CC
to Reset Delay
Reset Active Timeout Period
∆V
TH
/°C
t
RD
t
RP
V
IL
MR
Input
V
IH
V
IL
V
IH
MR
Minimum Input Pulse Width
MR
Glitch Rejection
MR
to Reset Delay Time
MR
Pullup Resistance
25
t
MD
V
TH
> 4.0V
V
TH
≤
4.0V
V
CC
= (V
TH
+100mV) to (V
TH
- 100mV)
100
2.0
0.2 x V
CC
0.7 x V
CC
1
100
200
50
75
µs
ns
ns
kΩ
V
TH
Table 1
T
A
= +25°C
T
A
= -40°C to +85°C
MIN
1.0
1.2
0.5
1.0
TYP
MAX
5.5
5.5
1.0
1.75
V
mV
ppm/°C
µs
280
0.8
V
ms
UNITS
V
Supply Current
I
CC
µA
V
TH
- 1.5% V
TH
V
TH
+ 1.5%
V
TH
- 2.5% V
TH
V
TH
+ 2.5%
6.3
9.5
40
20
185
MAX6400/MAX6401/MAX6402
MAX6403/MAX6404/MAX6405
2
_______________________________________________________________________________________
µP Supervisory Circuits in 4-Bump (2
✕
2)
Chip-Scale Package
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 1.0V to 5.5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
CC
= 3.0V and T
A
= +25°C.) (Note 1)
PARAMETER
RESET
Output Voltage Low
(MAX6400/MAX6402/MAX6403/
MAX6405)
SYMBOL
V
OL
CONDITIONS
I
SINK
= 1.6mA, V
CC
≥
2.1V, reset asserted
I
SINK
= 100µA, V
CC
≥
1.2V, reset asserted
I
SOURCE
= 500µA, V
CC
= 3.2V, MAX6400,
only, reset not asserted
RESET
Output Voltage High
(MAX6400/MAX6403)
V
OH
I
SOURCE
= 800µA, V
CC
= 4.5V,
V
TH
≤
4.38V, reset not asserted
I
SOURCE
= 800µA, V
CC
= V
TH
(max),
V
TH
≥
4.5V, reset not asserted
I
SOURCE
= 500µA, V
CC
≥
2.1V, reset
asserted
V
OH
I
SOURCE
= 50µA, V
CC
≥
1.2V, reset
asserted
I
SINK
= 1.2mA, V
CC
≥
3.2V, reset not
asserted, MAX6401 only
V
OL
I
SINK
= 3.2mA, V
CC
≥
4.5V, reset not
asserted, V
TH
≤
4.38V
I
SINK
= 3.2mA, V
CC
= V
TH
(max),
V
TH
≥
4.5V, reset not asserted
Open-Drain
RESET
Output
Leakage Current (Note 2)
RESET
not asserted
0.8 x V
CC
0.8 x V
CC
0.8 x V
CC
0.8 x V
CC
0.8 x V
CC
0.3
0.4
0.4
0.1
µA
V
V
MIN
TYP
MAX
0.3
V
0.4
UNITS
MAX6400–MAX6405
RESET Output Voltage
(MAX6401/MAX6404)
Note 1:
Production testing done at +25°C only. Overtemperature limits are guaranteed by design and not production tested.
Note 2:
Guaranteed by design.
_______________________________________________________________________________________
3
µP Supervisory Circuits in 4-Bump (2
✕
2)
Chip-Scale Package
MAX6400–MAX6405
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
MAX6400-05 toc01
POWER-DOWN RESET DELAY
vs. TEMPERATURE
V
OD
= OVERDRIVE VOLTAGE
200
RESET DELAY (µs)
MAX6400-05 toc02
250
1.4
1.2
SUPPLY CURRENT (µA)
V
CC
= 5V
1.0
0.8
0.6
0.4
0.2
0
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
V
CC
= 1.2V
V
CC
= 3.3V
150
V
OD
= 10mV
100
V
OD
= 20mV
50
V
OD
= 100mV
V
OD
= 200mV
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
0
POWER-UP RESET TIMEOUT
vs. TEMPERATURE
MAX6400-05 toc03
MAXIMUM TRANSIENT DURATION
vs. THRESHOLD OVERDRIVE
MAXIMUM TRANSIENT DURATION (µs)
MAX6400-05 toc04
210
POWER-UP RESET TIMEOUT (ms)
200
190
180
170
160
150
140
130
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
500
400
300
RESET/RESET IS
ASSERTED
ABOVE LINE
200
100
0
1
10
100
1000
THRESHOLD OVERDRIVE V
TH
- V
CC
(mV)
4
_______________________________________________________________________________________
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