Maxim MAX1609EEE, MAX1608EEE Datasheet

General Description

The MAX1608/MAX1609 provide remote input/output (I/O)
expansion through an SMBus™ 2-wire serial interface.
Each device has eight high-voltage open-drain outputs
that double as TTL-level logic inputs, providing continuous
bidirectional capabilities. The open-drain outputs tailor the
MAX1608/MAX1609 for use in load-switching and other
level-shifting applications as well as general-purpose I/O
applications.

Two complete sets of registers allow the device and its
outputs to be toggled between two states using the
SMBSUS input, without the inherent latency of reprogram­ming outputs over the serial bus. The eight I/O lines are
continuously monitored and can be used as inputs. Each
line can generate asynchronous maskable interrupts on
the falling edge, the rising edge, or both edges.

For load-switching applications, the MAX1608 is designed
to drive N-channel MOSFETs, and its outputs are low
upon power-up; the MAX1609 is designed to drive P­channel MOSFETs, and its I/Os are high impedance upon
power-up. Other features of both devices include thermal­overload and output-overcurrent protection, ultra-low sup­ply current, and a wide +2.7V to +5.5V supply range. The
MAX1608/MAX1609 are available in space-saving 16-pin
QSOP packages.

Applications

Parallel I/O Expansion
Power-Plane Switching
Notebook and Desktop Computers
Servers and Workstations
Notebook Docking Stations
Industrial Equipment

Features

♦ Serial-to-Parallel or Parallel-to-Serial Conversions

♦ 8 General-Purpose Digital I/O Pins

(withstand +28V)

♦ SMBus 2-Wire Serial Interface
♦ Supports SMBSUS Asynchronous Suspend

♦ 9 Pin-Selectable Slave Addresses

♦ Outputs High Impedance on Power-Up (MAX1609)

♦ Outputs Low on Power-Up (MAX1608)

♦ 2.5µA Supply Current

♦ +2.7V to +5.5V Supply Range

♦ 16-Pin QSOP Package

MAX1608/MAX1609

Octal SMBus-to-Parallel I/O Expanders

________________________________________________________________ Maxim Integrated Products 1

19-1639; Rev 0; 1/00

PART

MAX1608EEE

MAX1609EEE

-40°C to +85°C

-40°C to +85°C

TEMP. RANGE PIN-PACKAGE

16 QSOP

16 QSOP

Ordering Information

Typical Operating Circuits

Typical Operating Circuits continued at end of data sheet.

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

IO0 V+

SMBSUS

SMBCLK

ALERT

SMBDATA

ADD1

ADD0

GND

TOP VIEW

MAX1608
MAX1609

QSOP

IO1

IO2

IO5

IO3

IO4

IO6

IO7

Pin Configuration

SMBus is a trademark of Intel Corp.

For free samples and the latest literature, visit www.maxim-ic.com or phone [phone].
For small orders, phone [phone].

+2.7V TO +5.5V

V+

MAX1609

100k

0.1µF

100k 100k

P-CH

GND

IO1

IO2

IO3

LOAD1 LOAD2 LOAD3

IO7

TO/

ALERT

SMBDATA

SMBCLK

SMBSUS

ADD1

ADD

SMBUS

FROM

HOST

MAX1608/MAX1609

Octal SMBus-to-Parallel I/O Expanders

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V+ = +2.7V to +5.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at 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.

V+ to GND ................................................................-0.3V to +6V

IO_ to GND .............................................................-0.3V to +30V

IO_ Sink Current..................................................-1mA to +50mA

SMBCLK, SMBDATA, SMBSUS

and ALERT to GND .............................................-0.3V to +6V

ADD_ to GND ...............................................-0.3V to (V+ + 0.3V)

SMBDATA and ALERT Sink Current...................-1mA to +50mA

Continuous Power Dissipation (T

A

= +70°C)

16-Pin QSOP (derate 8.3mW/°C above +70°C)...........667mW

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

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

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

10°C typical hysteresis

ALERT forced to 5.5V

Static, all IOs low or pulled to 0

ALERT forced to 0.4V

SMBDATA forced to 0.6V

Static, outputs in any combination of on or off
states up to 28V

IO_, SMBSUS, SMBCLK, SMBDATA

IO_, SMBSUS, SMBCLK, SMBDATA

SMBSUS, SMBCLK, SMBDATA (Note 2)

(Note 3)

IO_ forced to 28V

10% or 90% of I/O to 10% of SMBCLK (Note 3)

IO_ to ALERT

IO_, V+ = 4.5V

IO_ forced to 1.0V, V+ = 4.5V

SMBus interface operating,
clock frequency = 100kHz

Falling edge of V+

SMBSUS to IO_

IO_ forced to 0.4V

SMBCLK to IO_

CONDITIONS

°C

140

Thermal Shutdown

µA

1

ALERT Output High Leakage Current

mA

1

ALERT Output Low Sink Current

mA

6

SMBus Output Low Sink Current

V

0.8

Logic Input Low Voltage

V

2.1

Logic Input High Voltage

V

0 5.5

SMBus Logic Input Voltage Range

µs

3

IO_ Data Hold Time

µs

10

IO_ Data Set-Up Time

10

1

µs

2.5

Propagation Delay

3.5 9

µA

718

V

2.7 5.5

Supply Voltage Range

Supply Current (Note 2)

µA

0.5 2

I/O Leakage Current

mA

15 25 50

I/O Current Limit

813

7

V

1.2 1.8 2.5

POR Threshold Voltage

mA

2

I/O Sink Current

UNITSMIN TYP MAXPARAMETER

SMBCLK, SMBDATA

SMBDATA, SMBCLK, SMBUS, ADD_

ADD_ during address sampling (POR, SPOR,
and RAP) to V+ and GND (Note 4)

pF

5

SMBus Input Capacitance

µA

-1 1

Logic Input Current

kΩ

20

Sample Address Input Impedance

MAX1608/MAX1609

Octal SMBus-to-Parallel I/O Expanders

_______________________________________________________________________________________ 3

TIMING CHARACTERISTICS

(V+ = +2.7V to +5.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

Note 1: Specifications from 0°C to -40°C are guaranteed by design, not production tested.
Note 2: For supply current, SMBus logic inputs driven to 0 or V+.
Note 3: Data hold and set-up times measured from falling edge of 9th clock.
Note 4: Must be driven to GND, V+, or floating. See SMBus Addressing section.
Note 5: The SMBus logic block is a static design and will work with clock frequencies down to DC. While slow operation is possible,

it violates the 10kHz minimum clock frequency and SMBus specifications and may use excessive space on the bus.

90% to 90% points

10% to 10% points

(Note 5)

10% or 90% of SMBDATA to 10% of SMBCLK

90% of SMBCLK to 10% of SMBDATA

10% of SMBDATA to 90% of SMBCLK

SMBCLK, SMBDATA; 10% to 90% points

SMBCLK, SMBDATA; 90% to 10% points

90% to 90% points

Master clocking in data

CONDITIONS

µs

3

SMBCLK Falling Edge to
SMBDATA Valid Time

µs

4

t

HIGH

SMBCLK Clock High Time

µs

4.7

t

LOW

kHz

DC 100

SMBus Clock Frequency

SMBCLK Clock Low Time

ns

300

t

HD:DAT

SMBus Data Hold Time

ns

250

t

SU:DAT

SMBus Data Valid to SMBCLK
Rising Edge Time

µs

4

t

SU:STO

SMBus Stop-Condition Setup
Time

µs

4

t

HD:STA

SMBus Start-Condition Hold
Time

µs

1

SMBus Rise Time

ns

300

SMBus Fall Time

µs

4.7

SMBus Start-Condition
Setup Time

ns

500

t

SU:STA

SMBus Repeated Start­Condition Setup Time

UNITSMIN TYP MAXSYMBOLPARAMETER

0

5.0

2.5

10.0

7.5

12.5

15.0

2.5 3.5 4.03.0 4.5 5.0 5.5

SUPPLY CURRENT vs. SUPPLY VOLTAGE

MAX1608/9 tTOC01

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (µA)

IOs = 1111 1111 PULLED UP TO +28V

IOs = 0000 0000

0

5.0

2.5

10.0

7.5

12.5

15.0

-40 20 40-20 0 60 80 100

SUPPLY CURRENT vs. TEMPERATURE

MAX1608/9 TOC02

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

IOs = 1111 1111 PULLED UP TO +28V

IOs = 0000 0000

0

2

4

6

8

10

12

14

16

021 3456

IO_ SINK CURRENT

vs. SUPPLY VOLTAGE

MAX1608/9 TOC03

SUPPLY VOLTAGE (V)

SINK CURRENT (mA)

V

IO_

= 1.0V

V

IO_

= 0.4V

Typical Operating Characteristics

(V+ = +5V, TA= +25°C, unless otherwise noted.)

MAX1608/MAX1609

Octal SMBus-to-Parallel I/O Expanders

4 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(V+ = +5V, TA= +25°C, unless otherwise noted.)

IO_
2V/div

ALERT
5V/div

MAX1608/9 TOC011

40ns/div

IO_ DRIVEN EXTERNALLY

ALERT DELAY

(IO_ RISING)

0

10

5

20

15

35

30

25

40

-40 0-20 20 40 60 80 100

IO_ CURRENT LIMIT vs. TEMPERATURE

MAX1608/9 TOC04

TEMPERATURE (°C)

IO_ CURRENT LIMIT (mA)

IO_ = 0 PULLED UP TO +28V

0

10

5

20

15

25

30

010155 202530

IO_ CURRENT LIMIT vs. IO_ VOLTAGE

MAX1608/9 TOC05

V

IO_

(V)

IO_ CURRENT LIMIT (mA)

V+ = 4.5V
IO_ = 0

0

5

10

15

20

25

30

35

40

2.5 3.53.0 4.0 4.5 5.0 5.5

IO_ CURRENT LIMIT vs. SUPPLY VOLTAGE

MAX1608/9 TOC06

SUPPLY VOLTAGE (V)

IO_ CURRENT LIMIT (mA)

V

IO_

= 15V

IO_ = 0

0

0.3

0.2

0.1

0.4

0.5

0.6

0.7

0.8

0.9

1.0

0105 15202530

IO_ BIAS CURRENT vs. IO_ VOLTAGE

MAX1608/9 TOC07

V

IO_

(V)

IO_ BIAS CURRENT (µA)

IO_ = 1

0

0.2

0.6

0.4

0.8

1.0

-40 0-20 20 40 60 80 100

IO_ BIAS CURRENT vs. TEMPERATURE

MAX1608/9 TOC08

TEMPERATURE (°C)

IO_ BIAS CURRENT (µA)

V+ = 5V
IO_ = 1 PULLED UP TO 28V

IO_
10V/div

SMBSUS
5V/div

SUSPEND-STATE DELAY

(IO_ RISING)

MAX1608/9 TOC09

100ns/div

PULL-UP = 10kΩ to 28V

IO_
10V/div

SMBSUS
5V/div

MAX1608/9 TOC010

100ns/div

SUSPEND-STATE DELAY

(IO_ FALLING)

PULL-UP = 10kΩ to 28V

MAX1608/MAX1609

Octal SMBus-to-Parallel I/O Expanders

_______________________________________________________________________________________ 5

Typical Operating Characteristics (continued)

(V+ = +5V, TA= +25°C, unless otherwise noted.)

IO_
2V/div

ALERT
5V/div

MAX1608/9 TOC012

200ns/div

IO_ DRIVEN EXTERNALLY

ALERT DELAY
(IO_ FALLING)

NAME FUNCTION

1–8 IO0 –IO7 Combined Input/Output. Open-drain output. Can withstand +28V.

9 GND Ground

PIN

10, 11 ADD0, ADD1 SMBus Address Select. See Table 1.

12 SMBDATA SMBus Serial-Data Input/Output. Open-drain output. Requires external pull-up resistor.

16 V+ Supply Voltage Input, +2.7V to +5.5V. Bypass to GND with a 0.1µF capacitor.

15

SMBSUS

SMBus Suspend-Mode Control Input. The device will enter the state previously stored in
the suspend-mode registers if low, or enter the state previously stored in the normal-mode
registers if high.

14 SMBCLK SMBus Serial Clock Input

13

ALERT

Active-Low Interrupt Output. Open-drain output. Requires external pull-up resistor.

Pin Description

Detailed Description

The MAX1608/MAX1609 convert 2-wire SMBus serial
data into eight latched parallel outputs (IO0–IO7). These
devices are intended for general-purpose remote I/O
expansion. Each device has eight high-voltage open­drain outputs that double as TTL-level logic inputs.
Typical applications range from high-side MOSFET load­switch drivers in power-management systems, to push­button switch monitors, to general-purpose digital I/Os.

The MAX1608/MAX1609 include two complete sets of
registers, each consisting of one output data register to

set the output states and two interrupt mask registers.
The SMBSUS line selects which set of registers control
the device state. The input register is used to perform
readback of the actual IO states.

The MAX1608/MAX1609 operate from a single +2.7V
to +5.5V supply with a typical quiescent current of

2.5µA, making them ideal for portable applications.
Additionally, the devices include an ALERT function to
alert the master of change of condition (Figure 1).

IO_ POWER-UP RESPONSE

MAX1608

PULL-UP = 10kΩ to V+

MAX1608/9 TOC013

V

IO_

500mV/div

V+
2V/div