19-2043; Rev 1; 8/01
µP Supervisory Circuits in 4-Bump (2 ✕ 2)
Chip-Scale Package
The MAX6400–MAX6405 is a family of ultra-low power
microprocessor (µP) supervisory circuits used for monitoring 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 circuit reliability and low cost by eliminating external components 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 whenever the VCC supply voltage falls below a preset threshold. 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 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™)
Applications
Portable/Battery-Powered Equipment
Cell Phones
PDAs
MP3 Players
Pagers
Selector Guide
PART
NOMINAL
VTH (V)
MAX6400
2.20 to 3.08
Push-Pull, Active-Low
MAX6401
2.20 to 3.08
Push-Pull, Active-High
MAX6402
2.20 to 3.08
Open-Drain, Active-Low
MAX6403
3.30 to 4.63
Push-Pull, Active-Low
MAX6404
3.30 to 4.63
Push-Pull, Active-High
MAX6405
3.30 to 4.63
Open-Drain, Active-Low
RESET/RESET
OUTPUT TYPE
____________________________Features
♦ 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.)
♦ 70% Smaller Than SC70 Package
♦ Ultra-Low 500nA (typ) Supply Current
(MAX6400/MAX6401/MAX6402)
♦ Factory-Trimmed Reset Thresholds from 2.20V to
4.63V in Approximately 100mV Increments
♦ ±2.5% Threshold Accuracy -40°C to +85°C
♦ Factory-Set 100ms (min) Reset Timeout Period
♦ Manual Reset Input
♦ Guaranteed Reset Valid to VCC = 1.0V
♦ Three Reset Output Logic Options: Active-Low
Push-Pull, Active-High Push-Pull, and Active-Low
Open-Drain.
♦ Immune to Short VCC Transients
♦ No External Components
Ordering Information
PART
TEMP. RANGE
o
o
PIN-PACKAGE
MAX6400BS_ _-T
-40 C to +85 C
UCSP-4
MAX6401BS_ _-T
-40oC to +85oC
UCSP-4
MAX6402BS_ _-T
-40oC to +85oC
UCSP-4
o
o
MAX6403BS_ _-T
-40 C to +85 C
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 increments. Choose the desired reset-threshold suffix from Table 1
and insert it in the blank space following “S”. There are 21 standard 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 nonstandard 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.
________________________________________________________________ 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.
1
MAX6400–MAX6405
General Description
MAX6400–MAX6405
µP Supervisory Circuits in 4-Bump (2 ✕ 2)
Chip-Scale Package
ABSOLUTE MAXIMUM RATINGS
All voltages measured with respect to GND, unless otherwise noted.
VCC ...........................................................................-0.3V to +6V
RESET, RESET (push-pull) .........................-0.3V to (VCC + 0.3V)
RESET (open-drain)..................................................-0.3V to +6V
MR ..............................................................-0.3V to (VCC + 0.3V)
Input/Output into Any Pin ....................................................20mA
Continuous Power Dissipation (TA = +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
(VCC = 1.0V to 5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = 3.0V and TA = +25°C.) (Note 1)
PARAMETER
Supply Voltage Range
Supply Current
SYMBOL
VCC
ICC
CONDITIONS
MIN
VTH
Reset Threshold Hysteresis
Reset Threshold Tempco
5.5
TA = -40°C to +85°C
1.2
5.5
MAX6400/MAX6401/MAX6402
VCC = 3.0V for VTH ≤ 2.93V,
VCC = 3.2V for VTH ≥ 2.93V, no load
tRD
Reset Active Timeout Period
tRP
VIL
MR Input
VIH
VIL
VIH
MR Minimum Input Pulse Width
tMD
1.0
1.0
1.75
VTH - 1.5% VTH VTH + 1.5%
TA = -40°C to +85°C
VTH - 2.5% VTH VTH + 2.5%
MAX6400/MAX6401/MAX6402
6.3
MAX6403/MAX6404/MAX6405
9.5
VTH > 4.0V
VTH ≤ 4.0V
µA
V
ppm/°C
µs
20
100
V
mV
40
VCC = (VTH +100mV) to (VTH - 100mV)
UNITS
185
280
ms
0.8
2.0
0.2 x VCC
V
0.7 x VCC
µs
1
MR Glitch Rejection
100
ns
MR to Reset Delay Time
200
ns
MR Pullup Resistance
2
Table 1
0.5
TA = +25°C
∆VTH/°C
VCC to Reset Delay
MAX
1.0
VCC = 5.5V, no load
Reset Threshold
TYP
TA = 0°C to +70°C
25
50
_______________________________________________________________________________________
75
kΩ
µP Supervisory Circuits in 4-Bump (2 ✕ 2)
Chip-Scale Package
MAX6400–MAX6405
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 1.0V to 5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = 3.0V and TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
RESET Output Voltage Low
(MAX6400/MAX6402/MAX6403/
MAX6405)
VOL
RESET Output Voltage High
(MAX6400/MAX6403)
VOH
VOH
RESET Output Voltage
(MAX6401/MAX6404)
VOL
Open-Drain RESET Output
Leakage Current (Note 2)
CONDITIONS
MIN
TYP
MAX
ISINK = 1.6mA, VCC ≥ 2.1V, reset asserted
0.3
ISINK = 100µA, VCC ≥ 1.2V, reset asserted
0.4
UNITS
V
ISOURCE = 500µA, VCC = 3.2V, MAX6400,
only, reset not asserted
0.8 x VCC
ISOURCE = 800µA, VCC = 4.5V,
VTH ≤ 4.38V, reset not asserted
0.8 x VCC
ISOURCE = 800µA, VCC = VTH (max),
VTH ≥ 4.5V, reset not asserted
0.8 x VCC
ISOURCE = 500µA, VCC ≥ 2.1V, reset
asserted
0.8 x VCC
ISOURCE = 50µA, VCC ≥ 1.2V, reset
asserted
0.8 x VCC
V
ISINK = 1.2mA, VCC ≥ 3.2V, reset not
asserted, MAX6401 only
0.3
ISINK = 3.2mA, VCC ≥ 4.5V, reset not
asserted, VTH ≤ 4.38V
0.4
ISINK = 3.2mA, VCC = VTH (max),
VTH ≥ 4.5V, reset not asserted
0.4
RESET not asserted
0.1
V
µA
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
Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
POWER-DOWN RESET DELAY
vs. TEMPERATURE
SUPPLY CURRENT vs. TEMPERATURE
1.0
VCC = 3.3V
0.6
200
150
VOD = 10mV
100
VOD = 20mV
0.4
50
VCC = 1.2V
0.2
0
-20
VOD = 200mV
0
20
40
60
-40
80
-20
0
20
40
60
TEMPERATURE (°C)
TEMPERATURE (°C)
POWER-UP RESET TIMEOUT
vs. TEMPERATURE
MAXIMUM TRANSIENT DURATION
vs. THRESHOLD OVERDRIVE
190
180
170
160
150
140
130
80
MAX6400-05 toc04
200
500
MAXIMUM TRANSIENT DURATION (µs)
MAX6400-05 toc03
210
400
300
RESET/RESET IS
ASSERTED
ABOVE LINE
200
100
0
-40
-20
0
20
40
TEMPERATURE (°C)
4
VOD = 100mV
0
-40
MAX6400-05 toc02
VCC = 5V
VOD = OVERDRIVE VOLTAGE
RESET DELAY (µs)
SUPPLY CURRENT (µA)
1.2
0.8
250
MAX6400-05 toc01
1.4
POWER-UP RESET TIMEOUT (ms)
MAX6400–MAX6405
µP Supervisory Circuits in 4-Bump (2 ✕ 2)
Chip-Scale Package
60
80
1
10
100
THRESHOLD OVERDRIVE VTH - VCC (mV)
_______________________________________________________________________________________
1000
µP Supervisory Circuits in 4-Bump (2 ✕ 2)
Chip-Scale Package
PIN
MAX6400/MAX6402
MAX6403/MAX6405
MAX6401/MAX6404
A1
A1
NAME
GND
FUNCTION
Ground
B1
—
RESET
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. Opendrain outputs require an external pullup resistor.
—
B1
RESET
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.
B2
B2
MR
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.
A2
A2
VCC
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 capability, 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/collector outputs. Connect a normally open momentary
switch from MR to GND to create a manual reset function; 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 microcontroller’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
MAX6400–MAX6405
Pin Description
MAX6400–MAX6405
µP Supervisory Circuits in 4-Bump (2 ✕ 2)
Chip-Scale Package
VTH
VCC
tRD
tRP
RESET
tMR
tRP
MR
Figure 1. Reset Timing Diagram
VCC
VCC
VCC
ated. The graph shows the maximum pulse width that a
negative going VCC transient may typically have when
issuing a reset signal. As the amplitude of the transient
increases, the maximum allowable pulse width
decreases.
Chip Information
µP
MAX6402/
MAX6405
RESET
MR
GND
MOTOROLA
68HCXX
TRANSISTOR COUNT: 512
PROCESS: BiCMOS
RESET
INPUT
GND
Figure 2. Interfacing to µPs with Bidirectional Reset Pins
6
_______________________________________________________________________________________
µP Supervisory Circuits in 4-Bump (2 ✕ 2)
Chip-Scale Package
MAX6400–MAX6405
Table 1. Factory Trimmed Reset Thresholds*
Reset Threshold Voltage, VTH (V)
PARTS
MAX6400BS
MAX6401BS
MAX6402BS
MAX6403BS
MAX6404BS
MAX6405BS
SUFFIX
TA = +25°C
T A = -40°C to +85°C
MIN
TYP
MAX
MIN
MAX
22*
2.167
2.200
2.233
2.145
2.250
23*
2.285
2.320
2.355
2.262
2.375
24
2.364
2.400
2.436
2.340
2.460
25
2.462
2.500
2.537
2.437
2.562
26*
2.591
2.630
2.669
2.564
2.692
27
2.660
2.700
2.741
2.633
2.768
28
2.758
2.800
2.842
2.730
2.870
29*
2.886
2.930
2.974
2.857
3.000
30
2.955
3.000
3.045
2.925
3.075
31*
3.034
3.080
3.126
3.003
3.150
33
3.250
3.300
3.350
3.217
3.383
34
3.349
3.400
3.451
3.315
3.485
35
3.447
3.500
3.552
3.412
3.587
36
3.546
3.600
3.654
3.510
3.690
37
3.644
3.700
3.755
3.607
3.792
38
3.743
3.800
3.857
3.705
3.895
39
3.841
3.900
3.958
3.802
3.997
40
3.940
4.000
4.060
3.900
4.100
41
4.038
4.100
4.161
3.997
4.202
42
4.137
4.200
4.263
4.095
4.305
43
4.235
4.300
4.364
4.192
4.407
44*
4.314
4.380
4.446
4.270
4.489
45
4.432
4.500
4.567
4.387
4.612
46*
4.560
4.630
4.699
4.514
4.746
Factory-trimmed voltage thresholds are available in approximately 100mV increments with a 1.5% room-temperature variance.
*Note: Parts marked with an asterisk (*) are standard versions.
_______________________________________________________________________________________
7
MAX6400–MAX6405
µP Supervisory Circuits in 4-Bump (2 ✕ 2)
Chip-Scale Package
Table 2. Device Marking Codes
PARTS
TOP MARK
PARTS
PARTS
TOP MARK
MAX6400BS31-T
AAJ
MAX6401BS31-T
ABV
MAX6402BS31-T
ACF
MAX6400BS30-T
AAI
MAX6401BS30-T
ABU
MAX6402BS30-T
ACE
MAX6400BS29-T
AAH
MAX6401BS29-T
ABT
MAX6402BS29-T
ACD
MAX6400BS28-T
AAG
MAX6401BS28-T
ABS
MAX6402BS28-T
ACC
MAX6400BS27-T
AAF
MAX6401BS27-T
ABR
MAX6402BS27-T
ACB
MAX6400BS26-T
AAE
MAX6401BS26-T
ABQ
MAX6402BS26-T
ACA
MAX6400BS25-T
AAD
MAX6401BS25-T
ABP
MAX6402BS25-T
ABZ
MAX6400BS24-T
AAC
MAX6401BS24-T
ABO
MAX6402BS24-T
ABY
MAX6400BS23-T
AAB
MAX6401BS23-T
ABN
MAX6402BS23-T
ABX
AAA
MAX6401BS22-T
ABM
MAX6402BS22-T
ABW
MAX6400BS22-T
PARTS
TOP MARK
PARTS
TOP MARK
ACT
MAX6404BS46-T
ADH
MAX6403BS45-T
ACS
MAX6404BS45-T
MAX6403BS44-T
ACR
MAX6404BS44-T
MAX6403BS46-T
PARTS
TOP MARK
MAX6405BS46-T
ADV
ADG
MAX6405BS45-T
ADU
ADF
MAX6405BS44-T
ADT
ADE
MAX6405BS43-T
ADS
ACQ
MAX6404BS43-T
MAX6403BS42-T
ACP
MAX6404BS42-T
ADD
MAX6405BS42-T
ADR
MAX6403BS41-T
ACO
MAX6404BS41-T
ADC
MAX6405BS41-T
ADQ
MAX6403BS40-T
ACN
MAX6404BS40-T
ADB
MAX6405BS40-T
ADP
MAX6403BS39-T
ACM
MAX6404BS39-T
ADA
MAX6405BS39-T
ADO
MAX6403BS38-T
ACL
MAX6404BS38-T
ACZ
MAX6405BS38-T
ADN
MAX6403BS37-T
ACK
MAX6404BS37-T
ACY
MAX6405BS37-T
ADM
MAX6403BS36-T
ACJ
MAX6404BS36-T
ACX
MAX6405BS36-T
ADL
MAX6403BS35-T
ACI
MAX6404BS35-T
ACW
MAX6405BS35-T
ADK
MAX6403BS34-T
ACH
MAX6404BS34-T
ACV
MAX6405BS34-T
ADJ
ACG
MAX6404BS33-T
ACU
MAX6405BS33-T
ADI
MAX6403BS43-T
MAX6403BS33-T
UCSP Reliability
The chip-scale package (UCSP) represents a unique
packaging form factor that may not perform equally to a
packaged product through traditional mechanical reliability tests. CSP reliability is integrally linked to the user’s
assembly methods, circuit board material, and usage
environment. The user should closely review these areas
when considering use of a CSP package. Performance
through Operating Life Test and Moisture Resistance
remains uncompromised as it is primarily determined by
the wafer-fabrication process.
8
TOP MARK
Mechanical stress performance is a greater consideration for a CSP package. CSPs are attached through
direct solder contact to the user’s PC board, foregoing
the inherent stress relief of a packaged product lead
frame. Solder joint contact integrity must be considered.
Information on Maxim’s qualification plan, test data, and
recommendations are detailed in the UCSP application
note, which can be found on Maxim’s website at
www.maxim-ic.com.
_______________________________________________________________________________________
µP Supervisory Circuits in 4-Bump (2 ✕ 2)
Chip-Scale Package
4L, UCSP 2x2.EPS
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ______________________9
© 2001 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
MAX6400–MAX6405
Package Information
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湘ICP备2023018690号
