MAXIM MAX6889, MAX6890, MAX6891 Technical data

General Description

The MAX6889/MAX6890/MAX6891 EEPROM-configurable, multivoltage supply sequencers/supervisors monitor several voltage detector inputs and generalpurpose logic inputs and feature programmable outputs for highly configurable power-supply sequencing applications. The MAX6889 features eight voltage detector inputs and ten programmable outputs. The MAX6890 features six voltage detector inputs and eight programmable outputs, while the MAX6891 features four voltage detector inputs and five programmable outputs. Manual reset and margin disable inputs offer additional flexibility.

All voltage detectors offer a configurable threshold for undervoltage detection. High-voltage input IN1 monitors voltages from 2.5V to 13.2V in 50mV increments, or from

1.25V to 7.625V in 25mV increments. Inputs IN2–IN7 monitor voltages from 1V to 5.5V in 20mV increments or from 0.5V to 3.05V in 10mV increments. High-voltage input IN8 monitors voltages from 2.5V to 15.25V in 50mV increments, or from 1.25V to 7.625V in 25mV increments.

Programmable output stages control power-supply sequencing or system resets/interrupts. Programmable output options include: active-high, active-low, open drain, and weak pullup. Programmable timing delay blocks configure each output to wait between 25µs and 1600ms before deasserting.

The MAX6889/MAX6890/MAX6891 feature a watchdog timer for added flexibility. Program the watchdog timer to assert one or more programmable outputs. The initial and normal watchdog timeout periods are independently programmable from 6.25ms to 102.4s.

An SMBus™/I2C*-compatible, 2-wire serial data interface programs and communicates with the configuration EEPROM, the configuration registers, and the internal 512-bit user EEPROM.

The MAX6889/MAX6890/MAX6891 are available in 5mm x 5mm x 0.8mm thin QFN packages and are specified to operate over the extended temperature range (-40°C to +85°C).

Applications

Telecommunication/Central Office Systems

Networking Systems

Servers/Workstations

Base Stations

Storage Equipment

Multi-Microprocessor/Voltage Systems

Features

♦ Eight (MAX6889), Six (MAX6890), or Four

(MAX6891) Configurable Input Voltage Detectors

High-Voltage Input (1.25V to 7.625V or

2.5V to 13.2V)

Six (MAX6889), Five (MAX6890), or Three

(MAX6891) Voltage Inputs (0.5V to 3.05V or 1V to 5.5V)

Additional (MAX6889) High-Voltage Input

(1.25V to 7.625V or 2.5V to 15.25V)

♦ Four (MAX6889/MAX6890) or Three (MAX6891)

General-Purpose Logic Inputs

♦ Configurable Watchdog Timer

♦ Ten (MAX6889), Eight (MAX6890), or Five

(MAX6891) Programmable Outputs

Active-High, Active-Low, Open Drain, Weak Pullup Timing Delays from 25µs to 1600ms

♦ Margining Disable and Manual Reset Controls

♦ 512-Bit Internal User EEPROM

Endurance: 100,000 Erase/Write Cycles Data Retention: 10 Years

♦ I

C/SMBus-Compatible Serial

Configuration/Communication Interface

♦ ±1% Threshold Accuracy

MAX6889/MAX6890/MAX6891

EEPROM-Programmable, Octal/Hex/Quad,

Power-Supply Sequencers/Supervisors

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-3595; Rev 0; 2/05

EVALUATION KIT

AVAILABLE

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.

PART

TEMP RANGE

PINPACKAGE

PKG

CODE

MAX6889ETJ

T3255-4

MAX6890ETI

T2855-8

MAX6891ETP

T2055-5

SMBus is a trademark of Intel Corp.

*Purchase of I

C components from Maxim Integrated Products, Inc. or one of its sublicensed Associated Companies, conveys a license under the Philips I

C Patent Rights to use these com-

ponents in an I

C system, provided that the system conforms

to the I

C Standard Specification as defined by Philips.

Pin Configurations and Typical Operating Circuit appear at end of data sheet.

查询MAX6888供应商

-40°C to +85°C 32 Thin QFN

-40°C to +85°C 28 Thin QFN

-40°C to +85°C 20 Thin QFN

MAX6889/MAX6890/MAX6891

EEPROM-Programmable, Octal/Hex/Quad, Power-Supply Sequencers/Supervisors

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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.

(All voltages referenced to GND.) IN2–IN7, V

, SDA, SCL, A0, A1, GPI_

MR, MARGIN .........................................................-0.3V to +6V

IN1, PO_ .................................................................-0.3V to +14V

IN8 ..........................................................................-0.3V to +20V

DBP ..........................................................................-0.3V to +3V

Input/Output Current (all pins)..........................................±20mA

Continuous Power Dissipation (T

= +70°C) 20-Pin Thin QFN (derate 21.3mW/°C

above +70°C)..............................................................1702mW

28-Pin Thin QFN (derate 21.3mW/°C

above +70°C)..............................................................1702mW

32-Pin Thin QFN (derate 21.3mW/°C

above +70°C)..............................................................1702mW

Operating Temperature Range ...........................-40°C to +85°C

Maximum Junction Temperature .....................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

ELECTRICAL CHARACTERISTICS

IN1

= 6.5V to 13.2V, V

IN2–VIN7

= 2.7V to 5.5V, V

IN8

= 10V, GPI_ = GND, MARGIN = MR = DBP, TA= -40°C to +85°C, unless other-

wise noted. Typical values are at T

= +25°C.) (Notes 1, 2, 3)

PARAMETER

CONDITIONS

UNITS

IN1

Voltage on IN1 to ensure the device is fully operational, IN2–IN8 = GND

4.0

Operating Voltage Range (Note 4)

Voltage on any one of IN2–IN5 or V

to ensure the device is fully operational, IN1 = GND

2.7 5.5

IN1 Supply Voltage (Note 4) V

IN1P

Minimum voltage on IN1 to guarantee that the device is powered through IN1

6.5 V

Undervoltage Lockout V

UVLO

Minimum voltage on one of IN2–IN5 to guarantee the device is EEPROM configured

2.5 V

Digital Bypass Voltage V

DBP

No load

IN1

= 13.2V, IN2–IN8 = GND, no load 1 1.2 mA

Supply Current I

Writing to configuration registers or EEPROM, no load

1.1 1.5 mA

IN1

(50mV increments) 2.5

IN1

(25mV increments)

IN2–VIN7

(20mV increments) 1.0 5.5

IN2–VIN7

(10mV increments)

IN8

(50mV increments)

IN8

(25mV increments)

Threshold Voltage Range V

IN2–VIN8

(high-Z mode in 3.3mV

increments)

SYM B O L

MIN TYP MAX

13.2

2.48 2.55 2.67

1.25 7.625

0.50 3.05

2.50 15.25

1.250 7.625

0.167 1.017

13.2

MAX6889/MAX6890/MAX6891

EEPROM-Programmable, Octal/Hex/Quad,

Power-Supply Sequencers/Supervisors

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

IN1

= 6.5V to 13.2V, V

IN2–VIN7

= 2.7V to 5.5V, V

IN8

= 10V, GPI_ = GND, MARGIN = MR = DBP, TA= -40°C to +85°C, unless other-

wise noted. Typical values are at T

= +25°C.) (Notes 1, 2, 3)

PARAMETER

CONDITIONS

UNITS

IN_

= 2.5V to 5.5V

(20mV increments)

-1 +1 %

IN_

= 1V to 2.5V

(20mV increments)

IN_

= 1.25V to 3.05V

(10mV increments)

-1 +1 %

TA = +25°C to +85°C

IN_

falling)

IN_

= 0.5V to 1.25V

(10mV increments)

IN_

= 2.5V to 5.5V

(20mV increments)

-2 +2 %

IN_

= 1V to 2.5V

(20mV increments)

IN_

= 1.25V to 3.05V

(10mV increments)

-2 +2 %

IN2–IN7 Threshold Accuracy

= -40°C to

+85°C (V

IN_

falling)

IN_

= 0.5V to 1.25V

(10mV increments)

IN_

= 6.25V to 13.2V

(6.25V to 15.25V for IN8) (50mV increments)

-1 +1 %

IN_

= 2.5V to 6.25V

(50mV increments)

IN_

= 3.125V to 7.625V

(25mV increments)

-1 +1 %

TA = +25°C to +85°C

IN_

falling)

IN_

= 1.25V to 3.125V

(25mV increments)

IN_

= 6.25V to 13.2V

(6.25V to 15.25V for IN8) (50mV increments)

-2 +2 %

IN_

= 2.5V to 6.25V

(50mV increments)

IN_

= 3.125V to 7.625V

(25mV increments)

-2 +2 %

IN1/IN8 Threshold Accuracy

= -40°C to

+85°C (V

IN_

falling)

IN_

= 1.25V to 3.125V

(25mV increments)

-1 +1

IN_ Threshold Accuracy

IN_ = 0.6V in high-Z mode (V

IN_

falling)

= -40°C to 85°C

-2 +2

Threshold Hysteresis

0.3

% V

SYM B O L

TH-HYST

MIN TYP MAX

-25 +25

TA = +25°C to +85°C

-12.5 +12.5

-50 +50

-25 +25

-62.5 +62.5

-31.25 +31.25

-125 +125

-62.5 +62.5

MAX6889/MAX6890/MAX6891

EEPROM-Programmable, Octal/Hex/Quad, Power-Supply Sequencers/Supervisors

4 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

IN1

= 6.5V to 13.2V, V

IN2–VIN7

= 2.7V to 5.5V, V

IN8

= 10V, GPI_ = GND, MARGIN = MR = DBP, TA= -40°C to +85°C, unless other-

wise noted. Typical values are at T

= +25°C.) (Notes 1, 2, 3)

PARAMETER

CONDITIONS

UNITS

Reset-Threshold Temperature Coefficient

ppm/°C

Threshold-Voltage Differential Nonlinearity

-1 +1 LSB

IN1 Input Leakage Current I

LIN1

For V

IN1

< the highest of V

IN2–VIN5

140 µA

IN2–IN7 Input Impedance

IN1

> 6.5V

555 kΩ

IN8 Input Impedance R

IN8

kΩ

IN2–IN8 Input Leakage Current

IN2–IN8 in high-Z mode, V

IN_

= 1.017V -50

Power-Up Delay t

VCC

UVLO

3ms

IN_ to PO_ Delay t

DPO

IN_

falling or rising, 100mV overdrive 20 µs

000 25 µs

001

010

011

100 45 50 55

101

220

110

440

PO_ Timeout Period t

(Table 19)

111

PO_ Output Low V

SINK

= 4mA, output asserted 0.4 V

PO_ Output Initial Pulldown Current

VCC

UVLO

, VPO = 0.8V 10 40 µA

PO_ Output Open-Drain Leakage Current

LKG

Output high impedance -1 +1 µA

PO_ Output Pullup Resistance R

PO_

= 2V 6.6 10

kΩ

0.6

MR, MARGIN, GPI_ Input Voltage

1.4

MR Input Pulse Width t

1µs

MR Glitch Rejection

MR to PO_ Delay t

DMR

2µs

MR to DBP Pullup Current I

VMR = 1.4V 5 10 15 µA

MARGIN to DBP Pullup Current

MARGIN

= 1.4V 5 10 15 µA

GPI_ Input Hysteresis

GPI_ to PO_ Delay t

DGPI_

GPI_ Pulldown Current I

GPI_

= 0.6V 5 10 15 µA

Watchdog Input Pulse Width t

WDI

GPI_ configured as a watchdog input 50 ns

SYM B O L

∆VTH/°C

VTH DNL

to R

IN2

IN7

LIN2-LIN8

MIN TYP MAX

100

290 400

730 1000 1400

+50

MARGIN

1.406 1.5625 1.719

5.625 6.25 6.875

22.5

27.5

180 200

360 400

1440 1600 1760

15.0

100

200

MAX6889/MAX6890/MAX6891

EEPROM-Programmable, Octal/Hex/Quad,

Power-Supply Sequencers/Supervisors

_______________________________________________________________________________________ 5

ELECTRICAL CHARACTERISTICS (continued)

IN1

= 6.5V to 13.2V, V

IN2–VIN7

= 2.7V to 5.5V, V

IN8

= 10V, GPI_ = GND, MARGIN = MR = DBP, TA= -40°C to +85°C, unless other-

wise noted. Typical values are at T

= +25°C.) (Notes 1, 2, 3)

PARAMETER

SYM B O L

CONDITIONS

MIN

TYP

MAX

UNITS

000

001

010 90

110

011

440

100

101

110

Watchdog Timeout Period t

(Table 21)

111

SERIAL INTERFACE LOGIC (SDA, SCL, A0, A1)

Logic-Input Low Voltage V

0.8 V

Logic-Input High Voltage V

2.0 V

Input Leakage Current I

LKG

-1 +1 µA

Output Low Voltage V

SINK

= 3mA 0.4 V

Input/Output Capacitance C

I/O

10 pF

SERIAL INTERFACE TIMING CHARACTERISTICS (Figure 3)

(IN1 = GND, V

IN2–VIN7

= 2.7V to 5.5V, V

IN8

= 10V, GPI_ = GND, MARGIN = MR = DBP, TA= -40°C to +85°C, unless otherwise

noted. Typical values are at T

= +25°C.) (Notes 1, 2, 3)

PARAMETER

CONDITIONS

UNITS

Serial Clock Frequency f

SCL

kHz

Clock Low Period t

LOW

1.3 µs

Clock High Period t

HIGH

0.6 µs

Bus-Free Time t

BUF

1.3 µs

START Setup Time t

SU:STA

0.6 µs

START Hold Time

0.6 µs

STOP Setup Time

0.6 µs

Data In Setup Time

Data In Hold Time

Receive SCL/SDA Minimum Rise Time

(Note 5)

Receive SCL/SDA Maximum Rise Time

(Note 5) 300 ns

Receive SCL/SDA Minimum Fall Time

(Note 5)

Receive SCL/SDA Maximum Fall Time

(Note 5) 300 ns

Transmit SDA Fall Time t

BUS

= 400pF

SYM B O L

5.625 6.25 6.875

22.5

100

360 400

1.44 1.60 1.76

5.76 6.40 7.04

23.04 25.60 28.16

92.16 102.40 112.64

MIN TYP MAX

27.5

400

HD:STA

SU:STO

SU:DAT

HD:DAT

20 + 0.1

x C

BUS

20 + 0.1

x C

BUS

100

20 + 0.04

x C

BUS

900

300

MAX6889/MAX6890/MAX6891

EEPROM-Programmable, Octal/Hex/Quad, Power-Supply Sequencers/Supervisors

6 _______________________________________________________________________________________

Note 1: 100% production tested at TA= +25°C and TA= +85°C. Specifications at TA= -40°C are guaranteed by design. Note 2: Specifications are guaranteed for the stated global conditions. The device also meets the parameters specified when 0 <

IN1

< 6.5V and at least one of V

IN2–VIN5

is between 2.7V and 5.5V, while the remaining V

IN2–VIN5

are between 0 and 5.5V.

Specifications are also guaranteed if VCCis externally supplied.

Note 3: Device may be supplied from any one of IN1 to IN5, or V

(see the Powering the MAX6889/MAX6890/MAX6891 section).

Note 4: The internal supply voltage, measured at V

, equals the maximum of IN2 to IN5 if V

IN1

= 0V, or equals 5.4V if V

IN1

> 6.5V.

For 4V < V

IN1

< 6.5V and V

IN2–VIN5

> 2.7V, the input that powers the device cannot be determined.

Note 5: C

BUS

= total capacitance of one bus line in pF. Rise and fall times are measured between 0.1 x V

BUS

and 0.9 x V

BUS

Note 6: Input filters on SDA, SCL, A0, and A1 suppress noise spikes < 50ns. Note 7: An additional cycle is required when writing to configuration memory for the first time.

Typical Operating Characteristics

IN1

= 6.5V to 13.2V, V

IN8

= 10V, V

IN_

= 2.7V to 5.5V, GPI_ = GND, MARGIN = MR = DBP, TA= +25°C, unless otherwise noted.)

SUPPLY CURRENT

vs. SUPPLY VOLTAGE (IN1)

MAX6889 toc01

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (mA)

12.511.510.59.58.57.5

0.8

0.9

1.0

1.1

1.2

1.3

0.7

6.5 13.5

TA = +85°C

TA = -40°C

TA = +25°C

5.04.54.03.53.02.5 5.5

SUPPLY CURRENT

vs. SUPPLY VOLTAGE (IN2–IN5)

MAX6889 toc02

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (mA)

0.7

0.8

0.9

1.0

1.1

1.2

0.6

TA = +85°C

TA = -40°C

TA = +25°C

NORMALIZED PO_ TIMEOUT PERIOD

vs. TEMPERATURE

MAX6889 toc03

TEMPERATURE (°C)

NORMALIZED PO_ TIMEOUT PERIOD

603510-15

0.8

0.9

1.0

1.1

1.2

1.3

0.7

-40 85

SERIAL INTERFACE TIMING CHARACTERISTICS (Figure 3) (continued)

(IN1 = GND, V

IN2–VIN7

= 2.7V to 5.5V, V

IN8

= 10V, GPI_ = GND, MARGIN = MR = DBP, TA= -40°C to +85°C, unless otherwise

noted. Typical values are at T

= +25°C.) (Notes 1, 2, 3)

PARAMETER

SYM B O L

CONDITIONS

MIN

TYP

MAX

UNITS

Pulse Width of Spike Suppressed

(Note 6) 50 ns

EEPROM Byte Write Cycle Time t

(Note 7) 11 ms

MAX6889/MAX6890/MAX6891

EEPROM-Programmable, Octal/Hex/Quad,

Power-Supply Sequencers/Supervisors

_______________________________________________________________________________________ 7

IN_ TO PO_ PROPAGATION DELAY (µs)

IN_ TO PO_ PROPAGATION DELAY

vs. TEMPERATURE

MAX6889 toc04

TEMPERATURE (°C)

603510-15-40 85

100mV OVERDRIVE

NORMALIZED WATCHDOG TIMEOUT PERIOD

0.985

0.990

0.995

1.000

1.010

1.005

1.015

1.020

0.980

NORMALIZED WATCHDOG TIMEOUT PERIOD

vs. TEMPERATURE

MAX6889 toc05

TEMPERATURE (°C)

603510-15-40 85

NORMALIZED IN_ THRESHOLD

0.998

0.997

0.996

0.999

1.000

1.001

1.003

1.002

1.004

1.005

0.995

NORMALIZED IN_ THRESHOLD

vs. TEMPERATURE

MAX6889 toc06

TEMPERATURE (°C)

603510-15-40 85

1001011000

MAXIMUM IN_ TRANSIENT

vs. IN_ THRESHOLD OVERDRIVE

MAX6889 toc07

IN_ THRESHOLD OVERDRIVE (mV)

MAXIMUM TRANSIENT DURATION (µs)

100

125

150

175

200

PO_ ASSERTION OCCURS ABOVE THIS LINE

OUTPUT VOLTAGE LOW

vs. SINK CURRENT

MAX6889 toc08

SINK

(mA)

(mV)

13 141210 11345678912

100

150

200

250

300

350

400

450

500

015

0.240.200.12 0.160.080.04

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

2.2

2.4

2.6

OUTPUT VOLTAGE HIGH

vs. SOURCE CURRENT

MAX6889 toc09

OUT

(mA)

(mV)

WEAK PULLUP

MR TO PO_ PROPAGATION DELAY (µs)

1.85

1.90

1.95

2.00

2.10

2.05

2.15

2.20

1.80

MR TO PO_ PROPAGATION DELAY

vs. TEMPERATURE

MAX6889 toc10

TEMPERATURE (°C)

603510-15-40 85

Typical Operating Characteristics (continued)

IN1

= 6.5V to 13.2V, V

IN8

= 10V, V

IN_

= 2.7V to 5.5V, GPI_ = GND, MARGIN = MR = DBP, TA= +25°C, unless otherwise noted.)

MAX6889/MAX6890/MAX6891

EEPROM-Programmable, Octal/Hex/Quad, Power-Supply Sequencers/Supervisors

8 _______________________________________________________________________________________

Pin Description

MAX6889

NAME FUNCTION

111PO2

Programmable Output 2. Configurable, active-high, active-low, open-drain, or weak pullup output. PO2 pulls low with a 10µA internal current sink for 1V < V

< V

UVLO

. PO2 assumes its programmed conditional output state when V

exceeds undervoltage lockout (UVLO) of 2.5V.

222PO3

Programmable Output 3. Configurable, active-high, active-low, open-drain, or weak pullup output. PO3 pulls low with a 10µA internal current sink for 1V < V

< V

UVLO

. PO3 assumes its programmed conditional output state when V

exceeds undervoltage lockout (UVLO) of 2.5V.

333PO4

Programmable Output 4. Configurable, active-high, active-low, open-drain, or weak pullup output. PO4 pulls low with a 10µA internal current sink for 1V < V

< V

UVLO

. PO4 assumes its programmed conditional output state when V

exceeds undervoltage lockout (UVLO) of 2.5V.

444GND Ground

555PO5

Programmable Output 5. Configurable, active-high, active-low, open-drain, or weak pullup output. PO5 pulls low with a 10µA internal current sink for 1V < V

< V

UVLO

. PO5 assumes its programmed conditional output state when V

exceeds undervoltage lockout (UVLO) of 2.5V.

66—PO6

Programmable Output 6. Configurable, active-high, active-low, open-drain, or weak pullup output. PO6 pulls low with a 10µA internal current sink for 1V < V

< V

UVLO

. PO6 assumes its programmed conditional output state when V

exceeds undervoltage lockout (UVLO) of 2.5V.

77—PO7

Programmable Output 7. Configurable, active-high, active-low, open-drain, or weak pullup output. PO7 pulls low with a 10µA internal current sink for 1V < V

< V

UVLO

. PO7 assumes its programmed conditional output state when V

exceeds undervoltage lockout (UVLO) of 2.5V.

88—PO8

Programmable Output 8. Configurable, active-high, active-low, open-drain, or weak pullup output. PO8 pulls low with a 10µA internal current sink for 1V < V

< V

UVLO

. PO8 assumes its programmed conditional output state when V

exceeds undervoltage lockout (UVLO) of 2.5V.

9——PO9

Programmable Output 9. Configurable, active-high, active-low, open-drain, or weak pullup output. PO9 pulls low with a 10µA internal current sink for +1V < V

< V

UVLO

. PO9 assumes its programmed conditional output state when V

exceeds undervoltage lockout (UVLO) of 2.5V.

10 — — PO10

Programmable Output 10. Configurable, active-high, active-low, open-drain, or weak pullup output. PO10 pulls low with a 10µA internal current sink for 1V < V

< V

UVLO

. PO10 assumes its programmed conditional output state when V

exceeds undervoltage lockout (UVLO) of 2.5V.

11 9 6

Margin Input. MARGIN holds PO_ in its existing state when MARGIN is driven low. Leave MARGIN unconnected or connect to DBP if unused. MARGIN overrides MR if both assert at the same time. MARGIN is internally pulled up to DBP

through a 10µA current source.

MAX6890 MAX6891

MARGIN

MAX6889/MAX6890/MAX6891

EEPROM-Programmable, Octal/Hex/Quad,

Power-Supply Sequencers/Supervisors

_______________________________________________________________________________________ 9

Pin Description (continued)

MAX6889

NAME FUNCTION

12 10 7 MR

Manual Reset Input. MR is configurable to either assert PO_ into a programmed state or to have no effect on PO_ when driving MR low (see Table 6). Leave MR unconnected or connect to DBP if unused. MR is internally pulled up to DBP through a 10µA current source.

13 11 8 SDA Serial Data Input/Output (Open Drain). SDA requires an external pullup resistor.

14 12 9 SCL Serial Clock Input. SCL requires an external pullup resistor.

15 13 10 A0

Address Input 0. Address inputs allow up to four (MAX6889/MAX6890) or two (MAX6891) connections on one common bus. Connect A0 to GND or to the serial-interface power supply.

16 14 — A1

Address Input 1. Address inputs allow up to four MAX6889/MAX6890 connections on one common bus. Connect A1 to GND or to the serial-interface power supply.

17 15 — GPI4

General-Purpose Logic Input 4. An internal 10µA current source pulls GPI4 to GND. Configure GPI4 to control watchdog timer functions or the programmable outputs.

18 16 11 GPI3

General-Purpose Logic Input 3. An internal 10µA current source pulls GPI3 to GND. Configure GPI3 to control watchdog timer functions or the programmable outputs.

19 17 12 GPI2

General-Purpose Logic Input 2. An internal 10µA current source pulls GPI2 to GND. Configure GPI2 to control watchdog timer functions or the programmable outputs.

20 18 13 GPI1

General-Purpose Logic Input 1. An internal 10µA current source pulls GPI1 to GND. Configure GPI1 to control watchdog timer functions or the programmable outputs.

21 19 14 V

Internal Power-Supply Voltage. Bypass VCC to GND with a 1µF ceramic capacitor. V

supplies power to the internal circuitry. VCC is internally powered

from the highest of the monitored IN1–IN5 voltages. Do not use V

to supply

power to external circuitry. To externally supply V

, see the Powering the

MAX6889/MAX6890/MAX6891 section.

22 20 15 DBP

Internal Digital Power-Supply Voltage. Bypass DBP to GND with a 1µF ceramic capacitor. DBP supplies power to the EEPROM memory, the internal logic circuitry, and the programmable outputs. Do not use DBP to supply power to external circuitry.

23 — — IN8

High-Voltage Input 8. Configure IN8 to detect voltage thresholds from 2.5V to

15.25V in 50mV increments, or 1.25V to 7.625V in 25mV increments. For improved noise immunity, bypass IN8 to GND with a 0.1µF capacitor installed as close to the device as possible.

24 — — IN7

Voltage Input 7. Configure IN7 to detect voltage thresholds between 1V and 5.5V in 20mV increments, or 0.5V to 3.05V in 10mV increments. For improved noise immunity, bypass IN7 to GND with a 0.1µF capacitor installed as close to the device as possible.

MAX6890 MAX6891

MAX6889/MAX6890/MAX6891

EEPROM-Programmable, Octal/Hex/Quad, Power-Supply Sequencers/Supervisors

10 ______________________________________________________________________________________

Pin Description (continued)

MAX6889

NAME FUNCTION

25 21 — IN6

Voltage Input 6. Configure IN6 to detect voltage thresholds between 1V and 5.5V in 20mV increments, or 0.5V to 3.05V in 10mV increments. For improved noise immunity, bypass IN6 to GND with a 0.1µF capacitor installed as close to the device as possible.

26 22 — IN5

Voltage Input 5. Configure IN5 to detect voltage thresholds between 1V and 5.5V in 20mV increments, or 0.5V to 3.05V in 10mV increments. For improved noise immunity, bypass IN5 to GND with a 0.1µF capacitor installed as close to the device as possible.

27 23 16 IN4

Voltage Input 4. Configure IN4 to detect voltage thresholds between 1V and 5.5V in 20mV increments, or 0.5V to 3.05V in 10mV increments. For improved noise immunity, bypass IN4 to GND with a 0.1µF capacitor installed as close to the device as possible.

28 24 17 IN3

Voltage Input 3. Configure IN3 to detect voltage thresholds between 1V and 5.5V in 20mV increments, or 0.5V to 3.05V in 10mV increments. For improved noise immunity, bypass IN3 to GND with a 0.1µF capacitor installed as close to the device as possible.

29 25 18 IN2

Voltage Input 2. Configure IN2 to detect voltage thresholds between 1V and 5.5V in 20mV increments, or 0.5V to 3.05V in 10mV increments. For improved noise immunity, bypass IN2 to GND with a 0.1µF capacitor installed as close to the device as possible.

30 26 19 IN1

High-Voltage Input 1. Configure IN1 to detect voltage thresholds from 2.5V to

13.2V in 50mV increments, or 1.25V to 7.625V in 25mV increments. For improved noise immunity, bypass IN1 to GND with a 0.1µF capacitor installed as close to the device as possible.

31 27 — N.C. No Connection. Not internally connected.

32 28 20 PO1

Programmable Output 1. Configurable, active-high, active-low, open-drain, or weak pullup output. PO1 pulls low with a 10µA internal current sink for 1V < V

< V

UVLO

. PO1 assumes its programmed conditional output state when V

exceeds undervoltage lockout (UVLO) of 2.5V.

EP EP EP GND

Exposed Paddle. Internally connected to GND. Connect exposed paddle to GND or leave floating.

MAX6890 MAX6891

MAX6889/MAX6890/MAX6891

EEPROM-Programmable, Octal/Hex/Quad,

Power-Supply Sequencers/Supervisors

______________________________________________________________________________________ 11

PROGRAMMABLE ARRAY

GPI1

GPI2

GPI3

GPI4 *

MARGIN

TIMING BLOCK 1

TIMING BLOCK 2

TIMING BLOCK 3

TIMING BLOCK 4

TIMING BLOCK 5

TIMING BLOCK 6

TIMING BLOCK 7

TIMING BLOCK 8

TIMING BLOCK 9

TIMING BLOCK 10

MAIN

OSCILLATOR

REF

IN2 DETECTOR

IN3 DETECTOR

IN4 DETECTOR

IN5 DETECTOR

IN6 DETECTOR

IN2

IN3

IN4

IN5*

IN6*

IN1

IN_

DETECTOR

PO2 OUTPUT

PO3 OUTPUT

PO4 OUTPUT

PO5 OUTPUT

PO6 OUTPUT

PO7 OUTPUT

PO8 OUTPUT

PO2

PO3

PO4

PO5

PO6*

PO7*

PO8*

PO1

1µF

2-WIRE

INTERFACE

SDA

SCL

USER

EEPROM

CONFIG

REGISTERS

CONFIG

EEPROM

GND

* FOR MAX6889/MAX6890 ONLY. ** FOR MAX6889 ONLY.

IN7 DETECTORIN7**

IN8 DETECTORIN8**

5.4V LDO

PO9 OUTPUT

PO10 OUTPUT

PO9**

PO10**

OPEN-DRAIN OR

WEAK PULLUP

SWITCH

2.55V LDO OUTPUT

10kΩ

PO_ OUTPUT

10µA POWER-UP PULLDOWN

LO/

EEPROM

CHARGE PUMP

2.55V LDO

DBP

MAX6889 MAX6890 MAX6891

VIRTUAL DIODES

Functional Diagram

MAX6889/MAX6890/MAX6891

EEPROM-Programmable, Octal/Hex/Quad, Power-Supply Sequencers/Supervisors

12 ______________________________________________________________________________________

Detailed Description

The MAX6889/MAX6890/MAX6891 EEPROM-configurable, multivoltage supply sequencers/supervisors monitor several voltage detector inputs and generalpurpose logic inputs, and feature programmable outputs for highly-configurable power-supply sequencing applications. The MAX6889 features eight voltage detector inputs and ten programmable outputs. The MAX6890 features six voltage detector inputs and eight programmable outputs, while the MAX6891 features four voltage detector inputs and five programmable outputs. Manual reset and margin disable inputs simplify board-level testing during the manufacturing process.

All voltage detectors provide configurable thresholds for undervoltage detection. The high-voltage input (IN1) monitors voltages from 1.25V to 7.625V in 25mV increments, or 2.5V to 13.2V in 50mV increments. Inputs (IN2–IN7) monitor voltages from 0.5V to 3.05V in 10mV increments, or 1.0V to 5.5V in 20mV increments. An additional high-voltage input (IN8, MAX6889 only) monitors voltages from 1.25V to 7.625V in 25mV increments, or 2.5V to 15.25V in 50mV increments. To

monitor thresholds from 0.1667V to 1.0167V in 3.3mV increments, the respective input voltage detector must be programmed for high impedance (high-Z) and an external voltage-divider must be connected.

The host controller communicates with the MAX6889/MAX6890/MAX6891s’ internal 512-bit user EEPROM, configuration EEPROM, and configuration registers through an SMBus/I2C-compatible serial interface (see Figure 1).

Programmable output options include active-high, activelow, open drain, and weak pullup. Program each output to assert on any voltage detector input, general-purpose logic input, watchdog timer, or manual reset. Programmable timing delay blocks configure each output to wait between 25µs and 1600ms before deasserting.

The MAX6889/MAX6890/MAX6891 feature a watchdog timer for added flexibility. Program the watchdog timer to assert one or more programmable outputs. Program the watchdog timer to clear on a combination of one GPI_ input and one programmable output, one of the GPI_ inputs only, or one of the programmable outputs only. The initial and normal watchdog timeout periods are independently programmable from 6.25ms to 102.4s.

LOGIC NETWORK

FOR PO_

COMPARATORS

MR, GPI_,

MARGIN

IN _

OUTPUT STAGES

ANALOG BLOCK

DIGITAL BLOCK

SERIAL

INTERFACE

BOOT

CONTROLLER

EEPROM

(USER AND CONFIG)

SDA,

SCL

WATCHDOG

TIMER

GPI_

PO_

Figure 1. Top-Level Block Diagram

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