Rainbow Electronics MAX7311 User Manual

General Description

The MAX7311 2-wire-interfaced expander provides 16­bit parallel input/output (I/O) port expansion for
SMBus™-compatible and I2C-compatible applications.
The MAX7311 consists of input port registers, output
port registers, polarity inversion registers, configuration
registers, a bus timeout register, and an SMBus/I2C­compatible serial interface. The system master can
invert the MAX7311 input data by writing to the active­high polarity inversion register. The system master can
enable or disable bus timeout by writing to the bus
timeout register.

Any of the 16 I/O ports can be configured as an input or
output. A power-on reset (POR) initializes the 16 I/Os
as inputs. Three address select pins configure one of
64 slave ID addresses.

The MAX7311 is available in 24-pin SO, SSOP, TSSOP,
and thin QFN packages and is specified over the -40°C
to +125°C automotive temperature range.

Applications

Servers

RAID Systems

Industrial Control

Medical Equipment

PLCs

Instrumentation and Test Measurement

Features

♦ 400kbps I2C-Compatible Serial Interface

♦ 2V to 5.5V Operation

♦ 5V Overvoltage Tolerant I/Os

♦ 16 I/O Pins that Default to Inputs on Power-Up
♦ Open-Drain Interrupt Output (INT)

♦ Bus Timeout for Lock-Up-Free Operation

♦ 64 Slave ID Addresses Available

♦ Low Standby Current (2.9µA typ)

♦ Polarity Inversion

♦ 4mm

✕ 4mm, 0.8mm Thin QFN Package

♦ -40°C to +125°C Operation

MAX7311

2-Wire-Interfaced 16-Bit I/O Port Expander

with Interrupt

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-2747; Rev 0; 1/03

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.

SMBus is a trademark of Intel Corp.

Pin Configurations

+

V

24

SDA

23

SCL

22

AD0I/O0

21

I/O15

20

I/O14

19

I/O13

18

I/O12I/O4

17

16

I/O11

15

I/O10

14

I/O9

13

I/O8GND

AD1

AD2

I/O1

I/O2

I/O3

I/O5

I/O6

I/O7

1

INT

2

3

4

MAX7311

5

6

7

8

9

10

11

12

PART TEMP RANGE PIN-PACKAGE

MAX7311AWG -40°C to +125°C 24 Wide SO

MAX7311AAG -40°C to +125°C 24 SSOP

MAX7311ATG -40°C to +125°C 24 Thin QFN (4mm ✕ 4mm)

MAX7311AUG -40°C to +125°C 24 TSSOP

TOP VIEW

AD2 AD1 V

24 23 22 21 20 19

1

I/O0

2

I/O1

3

I/O2

I/O3

4

I/O4

5

I/O5

6

78 9101112

I/O6 I/O7 GND I/O8 I/O9 I/O10

+

INT

MAX7311

THIN QFN

SDA SCL

18

AD0

17

I/O15

16

I/O14

I/O13

15

I/O12

14

I/O11

13

TSSOP/SSOP/SO

MAX7311

2-Wire-Interfaced 16-Bit I/O Port Expander
with Interrupt

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(V+= 2V to 5.5V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at V+= 3.3V, 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

I/O0–I/O15 as Inputs ....................................(GND - 0.3V) to +6V

SCL, SDA, AD0, AD1, AD2, INT...................(GND - 0.3V) to +6V

Maximum V

+

Current ......................................................+250mA

Maximum GND Current ...................................................-250mA

DC Input Current on I/O0–I/O15 .......................................±20mA

DC Output Current on I/O0–I/O15 ....................................±80mA

Continuous Power Dissipation (T

A

= +70°C)

24-Pin Wide SO (derate 11.8mW/°C above +70°C) ....941mW

24-Pin SSOP (derate 8.0mW/°C above +70°C) ...........640mW

24-Pin TSSOP (derate 12.2mW/°C above +70°C) .......975mW

24-Pin Thin QFN (derate 20.8mW/°C above +70°C) .1668mW

Operating Temperature Range .........................-40°C to +125°C

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

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

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

Supply Voltage V

Power-On Reset Voltage V

SCL, SDA

Input Voltage Low V

Input Voltage High

Low-Level Output Voltage V

Leakage Current I

Input Capacitance 10 pF

I/O_

Input Voltage Low V

Input Voltage High V

Input Leakage Current

Internal Pullup Current TA = -40°C to +85°C, VIO = 0 34 100 µA

Low-Level Output Current I

High Output Current I

AD0, AD1, AD2

Input Voltage Low V

Input Voltage High V

PARAMETER SYM B O L CONDITIONS MIN TYP MAX UNITS

+

+

STBY

POR

IL

V

IH

OL

L

IL

IH

SINK

SOURCE

IL

IH

All I/Os unloaded,

= 400kHz

f

SCL

All I/Os unloaded,

= 0

f

SCL

I

= 6mA 0.4 V

SINK

T

= -40°C to +85°C; includes internal

A

pullup current, V

V+ = 2V, VOL = 0.5V 8.5 17

V+ = 3.3V, VOL = 0.5V 17 32

V+ = 5V, VOL = 0.5V 43

V+ = 3.3V, VOH = 2.4V 29 41

V+ = 5V, VOH = 4.5V 31

= V

IO

V+ = 2V 23 35

V+ = 3.3V 43 60Supply Current I

+

V

= 5.5V 80 120

V+ = 2V 2.3 11

V+ = 3.3V 2.9 12Standby Current I

+

V

= 5.5V 3.8 15.5

+

2 5.5 V

1.4 1.7 V

+

0.3 ✕ V

+

0.7 ✕ V

-1 +1 µA

0.8 V

1.8 V

1µA

+

0.3 ✕ V

0.7 ✕ V

+

µA

µA

V

V

mA

mA

V

V

MAX7311

2-Wire-Interfaced 16-Bit I/O Port Expander

with Interrupt

_______________________________________________________________________________________ 3

Note 1: All parameters are 100% production tested at TA= +25°C. Specifications over temperature are guaranteed by design.
Note 2: Minimum SCL clock frequency is limited by the MAX7311 bus timeout feature, which resets the serial bus interface if either

SDA or SCL is held low for a minimum of 25ms. Disable bus timeout feature for DC operation.

Note 3: A master device must internally provide a hold time of at least 300ns for the SDA signal (referred to the V

IL

of the SCL

signal) in order to bridge the undefined region SCL’s falling edge.

Note 4: C

B

= total capacitance of one bus line in pF.

Note 5: The maximum t

F

for the SDA and SCL bus lines is specified at 300ns. The maximum fall time for the SDA output stage tFis
specified at 250ns. This allows series protection resistors to be connected between the SDA and SCL pins and the
SDA/SCL bus lines without exceeding the maximum specified t

F

.

Note 6: Input filters on the SDA and SCL inputs suppress noise spikes less than 50ns.

DC ELECTRICAL CHARACTERISTICS (continued)

(V+= 2V to 5.5V, TA= -40°C to +125°C, unless otherwise noted. Typical values are at V+= 3.3V, TA= +25°C.) (Note 1)

AC ELECTRICAL CHARACTERISTICS

(V+= 2V to 5.5V, TA= -40°C to +125°C, unless otherwise noted.) (Note 1)

Leakage Current -1 +1 µA

Input Capacitance 4pF

INT

Low-Level Output Current I

PARAMETER SYM B O L CONDITIONS MIN TYP MAX UNITS

V

OL

= 0.4V 6 mA

OL

SCL Clock Frequency f

Bus Timeout t

Bus Free Time Between STOP
and START Conditions

Hold Time (Repeated) START
Condition

Repeated START Condition
Setup Time

STOP Condition Setup Time t

Data Hold Time t

Data Setup Time t

SCL Low Period t

SCL High Period t

SDA Fall Time t

Pulse Width of Spike Suppressed t

PORT TIMING

Output Data Valid t

Input Data Setup Time 27 µs

Input Data Hold Time 0µs

INTERRUPT TIMING

Interrupt Valid t

Interrupt Reset t

PARAMETER SYM B O L CONDITIONS MIN TYP MAX UNITS

SCL

TIMEOUT

t

BUF

t

HD,STA

t

SU,STA

SU,STO

HD,DAT

SU,DAT

LOW

HIGH

SP

PV

IR

(Note 2) 400 kHz

29 61 ms

Figure 2 1.3 µs

Figure 2 0.6 µs

Figure 2 0.6 µs

Figure 2 0.6 µs

Figure 2 (Note 3) 0.9 µs

Figure 2 100 ns

Figure 2 1.3 µs

Figure 2 0.7 µs

Figure 2 (Notes 4, 5)

F

(Note 6) 50 ns

Figure 7 3 µs

Figure 9 30.5 µs

IV

Figure 9 2 µs

V+ < 3.3V 500

V+ ≥ 3.3V 250

ns

MAX7311

2-Wire-Interfaced 16-Bit I/O Port Expander
with Interrupt

4 _______________________________________________________________________________________

Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)

SUPPLY CURRENT

vs. TEMPERATURE

MAX7311 toc01

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

1007525 500-25

10

20

30

40

50

60

70

80

90

100

0

-50 125

f

SCL

= 400kHz

ALL I/Os UNLOADED

V+ = 3.3V

V+ = 5V

V+ = 2V

STANDBY SUPPLY CURRENT

vs. TEMPERATURE

MAX7311 toc02

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

1007525 500-25

1

2

3

4

5

6

7

8

9

0

-50 125

SCL = V

+

ALL I/Os UNLOADED

V+ = 3.3V

V+ = 5V

V+ = 2V

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX7311 toc03

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (µA)

5.04.53.5 4.03.02.5

10

20

30

40

50

60

70

80

90

100

0

2.0 5.5

f

SCL

= 400kHz

ALL I/Os UNLOADED

I/O SINK CURRENT

vs. OUTPUT LOW VOLTAGE

MAX7311 toc04

VOL (V)

I

SINK

(mA)

0.50.40.30.20.1

2

4

6

8

10

12

14

16

18

20

22

24

0

0 0.6

V+ = 2V

TA = +125°C

TA = +25°C

TA = -40°C

I/O SINK CURRENT

vs. OUTPUT LOW VOLTAGE

MAX7311 toc05

VOL (V)

I

SINK

(mA)

0.50.40.30.20.1

5

10

15

20

25

30

35

40

45

50

0

0 0.6

V+ = 3.3V

TA = +125°C

TA = -40°C

TA = +25°C

I/O SINK CURRENT

vs. OUTPUT LOW VOLTAGE

MAX7311 toc06

VOL (V)

I

SINK

(mA)

0.40.30.20.1

5

10

15

20

25

30

35

40

45

50

0

0 0.5

V+ = 5V

TA = +125°C

TA = -40°C

TA = +25°C

I/O OUTPUT LOW VOLTAGE

vs. TEMPERATURE

MAX7311 toc07

TEMPERATURE (°C)

V

OL

(mV)

10075-25 0 25 50

50

100

150

200

250

300

350

400

0

-50 125

V+ = 5V, I

SINK

= 10mA

V+ = 2V, I

SINK

= 10mA

V+ = 2V, I

SINK

= 1mA

V+ = 5V, I

SINK

= 1mA

I/O SOURCE CURRENT

vs. OUTPUT HIGH VOLTAGE

MAX7311 toc08

V+ - VOH (V)

I

SOURCE

(mA)

0.60.50.40.30.20.1

5

10

15

20

25

0

0 0.7

V+ = 2V

TA = +125°C

TA = +25°C

TA = -40°C

I/O SOURCE CURRENT

vs. OUTPUT HIGH VOLTAGE

MAX7311 toc09

V+ - VOH (V)

I

SOURCE

(mA)

0.60.50.3 0.40.20.1

5

10

15

20

25

30

35

40

45

50

0

0 0.7

V+ = 3.3V

TA = +125°C

TA = +25°C

TA = -40°C

MAX7311

2-Wire-Interfaced 16-Bit I/O Port Expander

with Interrupt

_______________________________________________________________________________________ 5

Pin Description

Typical Operating Characteristics (continued)

(TA = +25°C, unless otherwise noted.)

I/O SOURCE CURRENT

vs. OUTPUT HIGH VOLTAGE

MAX7311 toc10

V+ - VOH (V)

I

SOURCE

(mA)

0.60.50.3 0.40.20.1

5

10

15

20

25

30

35

40

45

50

0

0

V+ = 5V

TA = +125°C

TA = +25°C

TA = -40°C

I/O HIGH VOLTAGE vs. TEMPERATURE

MAX7311 toc11

TEMPERATURE (°C)

V

+

- V

OH

(V)

1007550250-25

100

200

300

400

500

0

-50 125

V+ = 5V, I

SOURCE

= 10mA

V+ = 2V, I

SOURCE

= 10mA

PIN

TSSOP/

SSOP/SO

THIN

QFN

122INT Interrupt Output (Open Drain)

2 23 AD1 Address Input 1

3 24 AD2 Address Input 2

4–11 1–8 I/O0–I/O7 Input/Output Port 1

12 9 GND Supply Ground

13–20 10–17 I/O8–I/O15 Input/Output Port 2

21 18 AD0 Address Input 0

22 19 SCL Serial Clock Line

23 20 SDA Serial Data Line

24 21 V

NAME FUNCTION

+

Supply Voltage. Bypass with a 0.047µF capacitor to GND.

MAX7311

Detailed Description

The MAX7311 general-purpose input/output (GPIO)
peripheral provides up to 16 I/O ports, controlled
through an I2C-compatible serial interface. The
MAX7311 consists of input port registers, output port
registers, polarity inversion registers, configuration reg­isters, and a bus-timeout register. Upon power-on, all
I/O lines are set as inputs. Three slave ID address select
pins, AD0, AD1, and AD2, choose one of 64 slave ID
addresses, including the eight addresses supported by
the Phillips PCA9555. Table 1 is the register address
table. Tables 2–6 show detailed register information.

Serial Interface

Serial Addressing

The MAX7311 operates as a slave that sends and
receives data through a 2-wire interface. The interface
uses a serial data line (SDA) and a serial clock line
(SCL) to achieve bidirectional communication between
master(s) and slave(s). A master, typically a microcon­troller, initiates all data transfers to and from the
MAX7311, and generates the SCL clock that synchro­nizes the data transfer (Figure 2).

2-Wire-Interfaced 16-Bit I/O Port Expander
with Interrupt

6 _______________________________________________________________________________________

Figure 1. MAX7311 Block Diagram

Figure 2. 2-Wire Serial Interface Timing Diagram

SDA

SCL

t

SU, STO

I/O0
I/O1
I/O2
I/O3
I/O4
I/O5
I/O6
I/O7

I/O8
I/O9
I/O10
I/O11
I/O12
I/O13
I/O14
I/O15

INT

t

BUF

AD0

AD1

AD2

SCL

SDA

N

+

V

t

LOW

t

SU, DAT

INPUT
FILTER

POWER-ON

RESET

t

HD, DAT

SMBus

CONTROL

MAX7311

t

SU, STA

GND

8 BIT

WRITE PULSE

READ PULSE

8 BIT

WRITE PULSE

READ PULSE

t

HD, STA

INPUT/OUTPUT

PORT 1

INPUT/OUTPUT

PORT 2

t

t

HD, STA

START CONDITION

HIGH

t

R

t

F

REPEATED START CONDITION

START CONDITIONSTOP CONDITION