MAX6400BS30+ - Maxim Integrated Products, Inc.

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

____________________________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

MAX6400–MAX6405

µP Supervisory Circuits in 4-Bump (2 ✕ 2)

Chip-Scale Package

________________________________________________________________ Maxim Integrated Products 1

PART NOMINAL

VTH (V)

RESET/RESET

OUTPUT TYPE

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

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

Selector Guide

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.

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.

19-2043; Rev 1; 8/01

UCSP is a trademark of Maxim Integrated Products, Inc.

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.

MAX6400–MAX6405

µP Supervisory Circuits in 4-Bump (2 ✕ 2)

Chip-Scale Package

2 _______________________________________________________________________________________

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

TA = 0°C to +70°C 1.0 5.5

Supply Voltage Range VCC TA = -40°C to +85°C 1.2 5.5 V

MAX6400/MAX6401/MAX6402

VCC = 3.0V for VTH ≤ 2.93V,

VCC = 3.2V for VTH ≥ 2.93V, no load 0.5 1.0

Supply Current ICC

VCC = 5.5V, no load 1.0 1.75

µA

TA = +25°CV

- 1.5% VTH VTH

+ 1.5%

Reset Threshold VTH Table 1 TA = -40°C to +85°CV

- 2.5% VTH VTH

+ 2.5% V

MAX6400/MAX6401/MAX6402 6.3

Reset Threshold Hysteresis MAX6403/MAX6404/MAX6405 9.5 mV

Reset Threshold Tempco ∆VTH/°C 40 ppm/°C

VCC to Reset Delay tRD VCC = (VTH +100mV) to (VTH - 100mV) 20 µs

Reset Active Timeout Period tRP 100 185 280 ms

VIL 0.8

VIH

VTH > 4.0V 2.0

VIL 0.2 x VCC

MR Input

VIH

VTH ≤ 4.0V 0.7 x VCC

MR Minimum Input Pulse Width tMD 1µs

MR Glitch Rejection 100 ns

MR to Reset Delay Time 200 ns

MR Pullup Resistance 25 50 75 kΩ

ABSOLUTE MAXIMUM RATINGS

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)

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.

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

All voltages measured with respect to GND, unless otherwise noted.

MAX6400–MAX6405

µP Supervisory Circuits in 4-Bump (2 ✕ 2)

Chip-Scale Package

_______________________________________________________________________________________ 3

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

ISINK = 1.6mA, VCC ≥ 2.1V, reset asserted 0.3

RESET Output Voltage Low

(MAX6400/MAX6402/MAX6403/

MAX6405)

VOL

ISINK = 100µA, VCC ≥ 1.2V, reset asserted 0.4

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

RESET Output Voltage High

(MAX6400/MAX6403) VOH

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

VOH ISOURCE = 50µA, VCC ≥ 1.2V, reset

asserted 0.8 x VCC

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

RESET Output Voltage

(MAX6401/MAX6404)

VOL

ISINK = 3.2mA, VCC = VTH (max),

VTH ≥ 4.5V, reset not asserted 0.4

Open-Drain RESET Output

Leakage Current (Note 2) RESET not asserted 0.1 µA

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)

Note 1: Production testing done at +25°C only. Overtemperature limits are guaranteed by design and not production tested.

Note 2: Guaranteed by design.

MAX6400–MAX6405

µP Supervisory Circuits in 4-Bump (2 ✕ 2)

Chip-Scale Package

4 _______________________________________________________________________________________

Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)

0.2

0.6

0.4

1.2

1.0

0.8

1.4

-40 0-20 20 40 60 80

SUPPLY CURRENT vs. TEMPERATURE

MAX6400-05 toc01

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

VCC = 5V

VCC = 3.3V

VCC = 1.2V

150

100

200

250

-40 0-20 20 40 60 80

POWER-DOWN RESET DELAY

vs. TEMPERATURE

MAX6400-05 toc02

TEMPERATURE (°C)

RESET DELAY (µs)

VOD = 10mV

VOD = 20mV

VOD = 100mV

VOD = 200mV

VOD = OVERDRIVE VOLTAGE

130

150

140

170

160

200

190

180

210

-40 0-20 20 40 60 80

POWER-UP RESET TIMEOUT

vs. TEMPERATURE

MAX6400-05 toc03

TEMPERATURE (°C)

POWER-UP RESET TIMEOUT (ms)

1 100010010

MAXIMUM TRANSIENT DURATION

vs. THRESHOLD OVERDRIVE

500

200

100

400

300

MAX6400-05 toc04

THRESHOLD OVERDRIVE VTH - VCC (mV)

MAXIMUM TRANSIENT DURATION (µs)

RESET/RESET IS

ASSERTED

ABOVE LINE

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 50kΩpullup 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-

MAX6400–MAX6405

µP Supervisory Circuits in 4-Bump (2 ✕ 2)

Chip-Scale Package

_______________________________________________________________________________________ 5

MAX6400/MAX6402

MAX6403/MAX6405 MAX6401/MAX6404 NAME FUNCTION

A1 A1 GND 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. Open-

drain 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

Pin Description

MAX6400–MAX6405

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

TRANSISTOR COUNT: 512

PROCESS: BiCMOS

µP Supervisory Circuits in 4-Bump (2 ✕ 2)

Chip-Scale Package

6 _______________________________________________________________________________________

RESET

INPUT

VCC

µP

MAX6402/

MAX6405

VCC

RESET

MOTOROLA

68HCXX

GND

VCC

Figure 2. Interfacing to µPs with Bidirectional Reset Pins

VCC

RESET

VTH

tRD

tRP

tMR

tRP

Figure 1. Reset Timing Diagram

MAX6400–MAX6405

µP Supervisory Circuits in 4-Bump (2 ✕ 2)

Chip-Scale Package

_______________________________________________________________________________________ 7

Reset Threshold Voltage, VTH (V)

TA = +25°CT

A = -40°C to +85°C

PARTS SUFFIX

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

MAX6400BS

MAX6401BS

MAX6402BS

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

MAX6403BS

MAX6404BS

MAX6405BS

46* 4.560 4.630 4.699 4.514 4.746

Table 1. Factory Trimmed Reset Thresholds*

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.

PARTS TOP MARK PARTS TOP MARK 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

MAX6400BS22-T AAA MAX6401BS22-T ABM MAX6402BS22-T ABW

PARTS TOP MARK PARTS TOP MARK PARTS TOP MARK

MAX6403BS46-T ACT MAX6404BS46-T ADH MAX6405BS46-T ADV

MAX6403BS45-T ACS MAX6404BS45-T ADG MAX6405BS45-T ADU

MAX6403BS44-T ACR MAX6404BS44-T ADF MAX6405BS44-T ADT

MAX6403BS43-T ACQ MAX6404BS43-T ADE MAX6405BS43-T ADS

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

MAX6403BS33-T ACG MAX6404BS33-T ACU MAX6405BS33-T ADI

Table 2. Device Marking Codes

MAX6400–MAX6405

µP Supervisory Circuits in 4-Bump (2 ✕ 2)

Chip-Scale Package

8 _______________________________________________________________________________________

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 reliabil-

ity 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 considera-

tion 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.

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

Package Information

4L, UCSP 2x2.EPS

µP Supervisory Circuits in 4-Bump (2 ✕ 2)

Chip-Scale Package

MAX6400–MAX6405