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19-2043; Rev 1; 8/01
P Supervisory Circuits in 4-Bump (2 2) Chip-Scale Package
General Description
The MAX6400-MAX6405 is a family of ultra-low power microprocessor (P) 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 (UCSPTM)
____________________________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 -40C to +85C 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
MAX6400-MAX6405
Ordering Information
PART MAX6400BS_ _-T MAX6401BS_ _-T MAX6402BS_ _-T MAX6403BS_ _-T MAX6404BS_ _-T MAX6405BS_ _-T TEMP. RANGE -40 C to +85 C -40oC to +85oC -40oC to +85oC -40 C to +85 C -40oC to +85oC -40oC to +85oC
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 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
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. 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.
P 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. 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 = +70C) 4-Bump UCSP (derate 3.8mW/C above +70C).........303mW Operating Temperature Range ..........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range ............................-65C to +150C Bump Reflow Temperature .............................................+235C
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 = -40C to +85C, unless otherwise noted. Typical values are at VCC = 3.0V and TA = +25C.) (Note 1)
PARAMETER Supply Voltage Range SYMBOL VCC CONDITIONS TA = 0C to +70C TA = -40C to +85C MAX6400/MAX6401/MAX6402 VCC = 3.0V for VTH 2.93V, VCC = 3.2V for VTH 2.93V, no load VCC = 5.5V, no load Reset Threshold Reset Threshold Hysteresis Reset Threshold Tempco VCC to Reset Delay Reset Active Timeout Period VTH/C tRD tRP VIL MR Input VIH VIL VIH MR Minimum Input Pulse Width MR Glitch Rejection MR to Reset Delay Time MR Pullup Resistance 25 tMD VTH > 4.0V VTH 4.0V VCC = (VTH +100mV) to (VTH - 100mV) 100 2.0 0.2 x VCC 0.7 x VCC 1 100 200 50 75 s ns ns k VTH Table 1 TA = +25C TA = -40C to +85C MIN 1.0 1.2 0.5 1.0 TYP MAX 5.5 5.5 1.0 1.75 V mV ppm/C s 280 0.8 V ms UNITS V
Supply Current
ICC
A
VTH - 1.5% VTH VTH + 1.5% VTH - 2.5% VTH VTH + 2.5% 6.3 9.5 40 20 185
MAX6400/MAX6401/MAX6402 MAX6403/MAX6404/MAX6405
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P Supervisory Circuits in 4-Bump (2 2) Chip-Scale Package
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 1.0V to 5.5V, TA = -40C to +85C, unless otherwise noted. Typical values are at VCC = 3.0V and TA = +25C.) (Note 1)
PARAMETER RESET Output Voltage Low (MAX6400/MAX6402/MAX6403/ MAX6405) SYMBOL VOL CONDITIONS ISINK = 1.6mA, VCC 2.1V, reset asserted ISINK = 100A, VCC 1.2V, reset asserted ISOURCE = 500A, VCC = 3.2V, MAX6400, only, reset not asserted RESET Output Voltage High (MAX6400/MAX6403) VOH ISOURCE = 800A, VCC = 4.5V, VTH 4.38V, reset not asserted ISOURCE = 800A, VCC = VTH (max), VTH 4.5V, reset not asserted ISOURCE = 500A, VCC 2.1V, reset asserted VOH ISOURCE = 50A, VCC 1.2V, reset asserted ISINK = 1.2mA, VCC 3.2V, reset not asserted, MAX6401 only VOL ISINK = 3.2mA, VCC 4.5V, reset not asserted, VTH 4.38V ISINK = 3.2mA, VCC = VTH (max), VTH 4.5V, reset not asserted Open-Drain RESET Output Leakage Current (Note 2) RESET not asserted 0.8 x VCC 0.8 x VCC 0.8 x VCC 0.8 x VCC 0.8 x VCC 0.3 0.4 0.4 0.1 A V V MIN TYP MAX 0.3 V 0.4 UNITS
MAX6400-MAX6405
RESET Output Voltage (MAX6401/MAX6404)
Note 1: Production testing done at +25C only. Overtemperature limits are guaranteed by design and not production tested. Note 2: Guaranteed by design.
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P Supervisory Circuits in 4-Bump (2 2) Chip-Scale Package MAX6400-MAX6405
Typical Operating Characteristics
(TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
MAX6400-05 toc01
POWER-DOWN RESET DELAY vs. TEMPERATURE
VOD = OVERDRIVE VOLTAGE 200 RESET DELAY (s)
MAX6400-05 toc02
250
1.4 1.2 SUPPLY CURRENT (A) VCC = 5V 1.0 0.8 0.6 0.4 0.2 0 -40 -20 0 20 40 60 80 TEMPERATURE (C) VCC = 1.2V VCC = 3.3V
150 VOD = 10mV 100 VOD = 20mV 50 VOD = 100mV VOD = 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 (s)
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 VTH - VCC (mV)
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P Supervisory Circuits in 4-Bump (2 2) Chip-Scale Package
Pin Description
PIN MAX6400/MAX6402 MAX6403/MAX6405 A1 MAX6401/MAX6404 A1 NAME GND 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. Opendrain 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 50k 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 FUNCTION
MAX6400-MAX6405
B1
--
RESET
--
B1
RESET
B2
B2
MR
A2
A2
VCC
Detailed Description
Reset Output
A microprocessor's (P's) reset input starts the P in a known state. These P 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).
the reset active timeout period (tRP) after MR returns high. This input has an internal 50k 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 0.1F capacitor from MR to ground to provide additional noise immunity (see Figure 1).
Applications Information
Interfacing to P with Bidirectional Reset Pins
Since the RESET output on the MAX6402/MAX6405 is open-drain, these devices interface easily with (Ps) that have bidirectional reset pins. Connecting the P supervisor's RESET output directly to the microcontroller's (C'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 gener5
Manual Reset Input
Many P-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
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P Supervisory Circuits in 4-Bump (2 2) Chip-Scale Package MAX6400-MAX6405
VCC
VTH
tRD
tRP
RESET
tMR tRP
MR
Figure 1. Reset Timing Diagram
VCC
VCC
VCC P
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
MAX6402/ MAX6405
MR
RESET RESET INPUT
MOTOROLA 68HCXX
TRANSISTOR COUNT: 512 PROCESS: BiCMOS
GND
GND
Figure 2. Interfacing to Ps with Bidirectional Reset Pins
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P Supervisory Circuits in 4-Bump (2 2) Chip-Scale Package
Table 1. Factory Trimmed Reset Thresholds*
Reset Threshold Voltage, VTH (V) PARTS SUFFIX MIN 22* 23* 24 25 MAX6400BS MAX6401BS MAX6402BS 26* 27 28 29* 30 31* 33 34 35 36 37 38 MAX6403BS MAX6404BS MAX6405BS 39 40 41 42 43 44* 45 46* 2.167 2.285 2.364 2.462 2.591 2.660 2.758 2.886 2.955 3.034 3.250 3.349 3.447 3.546 3.644 3.743 3.841 3.940 4.038 4.137 4.235 4.314 4.432 4.560 TA = +25C TYP 2.200 2.320 2.400 2.500 2.630 2.700 2.800 2.930 3.000 3.080 3.300 3.400 3.500 3.600 3.700 3.800 3.900 4.000 4.100 4.200 4.300 4.380 4.500 4.630 MAX 2.233 2.355 2.436 2.537 2.669 2.741 2.842 2.974 3.045 3.126 3.350 3.451 3.552 3.654 3.755 3.857 3.958 4.060 4.161 4.263 4.364 4.446 4.567 4.699 T A = -40C to +85C MIN 2.145 2.262 2.340 2.437 2.564 2.633 2.730 2.857 2.925 3.003 3.217 3.315 3.412 3.510 3.607 3.705 3.802 3.900 3.997 4.095 4.192 4.270 4.387 4.514 MAX 2.250 2.375 2.460 2.562 2.692 2.768 2.870 3.000 3.075 3.150 3.383 3.485 3.587 3.690 3.792 3.895 3.997 4.100 4.202 4.305 4.407 4.489 4.612 4.746
MAX6400-MAX6405
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.
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P Supervisory Circuits in 4-Bump (2 2) Chip-Scale Package MAX6400-MAX6405
Table 2. Device Marking Codes
PARTS MAX6400BS31-T MAX6400BS30-T MAX6400BS29-T MAX6400BS28-T MAX6400BS27-T MAX6400BS26-T MAX6400BS25-T MAX6400BS24-T MAX6400BS23-T MAX6400BS22-T PARTS MAX6403BS46-T MAX6403BS45-T MAX6403BS44-T MAX6403BS43-T MAX6403BS42-T MAX6403BS41-T MAX6403BS40-T MAX6403BS39-T MAX6403BS38-T MAX6403BS37-T MAX6403BS36-T MAX6403BS35-T MAX6403BS34-T MAX6403BS33-T TOP MARK AAJ AAI AAH AAG AAF AAE AAD AAC AAB AAA TOP MARK ACT ACS ACR ACQ ACP ACO ACN ACM ACL ACK ACJ ACI ACH ACG PARTS MAX6401BS31-T MAX6401BS30-T MAX6401BS29-T MAX6401BS28-T MAX6401BS27-T MAX6401BS26-T MAX6401BS25-T MAX6401BS24-T MAX6401BS23-T MAX6401BS22-T PARTS MAX6404BS46-T MAX6404BS45-T MAX6404BS44-T MAX6404BS43-T MAX6404BS42-T MAX6404BS41-T MAX6404BS40-T MAX6404BS39-T MAX6404BS38-T MAX6404BS37-T MAX6404BS36-T MAX6404BS35-T MAX6404BS34-T MAX6404BS33-T TOP MARK ABV ABU ABT ABS ABR ABQ ABP ABO ABN ABM TOP MARK ADH ADG ADF ADE ADD ADC ADB ADA ACZ ACY ACX ACW ACV ACU PARTS MAX6402BS31-T MAX6402BS30-T MAX6402BS29-T MAX6402BS28-T MAX6402BS27-T MAX6402BS26-T MAX6402BS25-T MAX6402BS24-T MAX6402BS23-T MAX6402BS22-T PARTS MAX6405BS46-T MAX6405BS45-T MAX6405BS44-T MAX6405BS43-T MAX6405BS42-T MAX6405BS41-T MAX6405BS40-T MAX6405BS39-T MAX6405BS38-T MAX6405BS37-T MAX6405BS36-T MAX6405BS35-T MAX6405BS34-T MAX6405BS33-T TOP MARK ACF ACE ACD ACC ACB ACA ABZ ABY ABX ABW TOP MARK ADV ADU ADT ADS ADR ADQ ADP ADO ADN ADM ADL ADK ADJ ADI
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.
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.
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P Supervisory Circuits in 4-Bump (2 2) Chip-Scale Package
Package Information
4L, UCSP 2x2.EPS
MAX6400-MAX6405
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 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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