MAXIM MAX7310 User Manual

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MAX7310

2-Wire-Interfaced 8-Bit I/O Port Expander

with Reset

________________________________________________________________ Maxim Integrated Products 1

19-2698; Rev 3; 2/05

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.

General Description

The MAX7310 provides 8-bit parallel input/output port
expansion for SMBus™-compatible and I2C™-compati­ble applications. The MAX7310 consists of an input port
register, an output port register, a polarity inversion reg­ister, a configuration register, a bus timeout register,
and an SMBus/I

2

C-compatible serial interface. The sys­tem master can invert the MAX7310 input data by writ­ing to the active-high polarity inversion register. The
system master can enable or disable bus timeout by
writing to the bus timeout register.

Any of the eight I/O ports may be configured as input or
output. An active-low reset input sets the eight I/Os as
inputs. Three address select pins configure one of 56
slave ID addresses.

The MAX7310 is available in 16-pin thin QFN, TSSOP,
and QSOP packages and is specified over the -40°C to
+125°C automotive temperature range.

Applications

Servers
RAID Systems
Industrial Control
Medical Equipment
Instrumentation, Test Measurement

Features

♦ 400kHz 2-Wire Interface

♦ 2.3V to 5.5V Operation

♦ Low Standby Current (1.7µA typ)

♦ Bus Timeout for Lock-Up-Free Operation

♦ 56 Slave ID Addresses

♦ Polarity Inversion

♦ Eight I/O Pins that Default to Inputs on Power-Up

♦ 5V Tolerant Open-Drain Output on I/O0

♦ 4mm x 4mm, 0.8mm Thin QFN Package

♦ -40°C to +125°C Operation

Ordering Information

Pin Configurations

SMBus is a trademark of Intel Corp.

Purchase of I

2

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

2

C Patent Rights to use these compo-

nents in an I

2

C system, provided that the system conforms to the

I

2

C Standard Specification as defined by Philips.

PART TEMP RANGE

MAX7310AUE -40°C to +125°C 16 TSSOP —

MAX7310AEE -40°C to +125°C 16 QSOP —

MAX7310ATE -40°C to +125°C 16 Thin QFN T1644-4

PIN­PACKAGE

PKG
CODE

TOP VIEW

SCL

SDA

AD0

AD1

AD2

I/O0

I/O1

GND

1

2

3

4

5

6

7

8

MAX7310

TSSOP/QSOP

V+

16

RESET

15

I/O7

14

I/O6

13

I/O5

12

11

I/O4

I/O3

10

9

I/O2

RESET

V+

SCL

SDA

I/O7

12

11 10 9

13

14

15

16

MAX7310ATE

1234

AD0

AD1

THIN QFN

I/O6

I/O5

AD2

I/O4

I/O0

I/O3

8

I/O2

7

GND

6

I/O1

5

MAX7310

2-Wire-Interfaced 8-Bit I/O Port Expander
with Reset

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.

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

I/O1–I/O7 as an Input.......................(V

SS

- 0.3V) to (VDD+ 0.3V)

I/O0 as an Input..............................................(V

SS

- 0.3V) to +6V

SCL, SDA, AD0, AD1, AD2, RESET ...............(V

SS

- 0.3V) to +6V

DC Current on I/O0 ........................................................ +400µA

DC Current on I/O1 to I/O7 ............................................. ±50mA

Maximum GND and V+ Current........................................180mA

Continuous Power Dissipation (T

A

= +70°C)

16-Pin TSSOP (derate 5.7mW/°C above +70°C) .........457mW

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

16-Pin Thin QFN (derate 16.9mW/°C above +70°C) ...1349mW

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

DC ELECTRICAL CHARACTERISTICS

(V+ = 2.3V to 5.5V, GND = 0, RESET = V+, TA= -40°C to +125°C, unless otherwise noted. Typical values are at V+ = 3.3V, TA= +25°C.)
(Note 1)

Supply Voltage V+ 2.3 5.5 V

Power-On Reset Voltage 1.6 2.1 V

SCL, SDA

Input Voltage Low V

Input Voltage High

Low-Level Output Voltage V

Leakage Current I

Input Capacitance C

I/Os

Input Voltage Low V

Input Voltage High V

Input Leakage Current I

Low-Level Output Current I

High Output Current for I/O1–I/O7 I

AD0, AD1, AD2, AND RESET

Input Voltage Low 0.8 V

Input Voltage High 2V

PARAMETER SYM B O L CONDITIONS MIN TYP MAX UNITS

All outputs floating,
all inputs at V+ or GND,
f

SCL

All outputs floating,
all inputs at V+ or GND,
f

SCL

IL

V

IH

OILISINK

L

I

IL

IH

All inputs at V+ or GND -1 +1 µA

L

V+ = 2.3V, VOL = 0.5V 8 14

V+ = 3.3V, VOL = 0.5V 12.5 22

OL

V+ = 5.5V, VOL = 0.5V 19 30

V+ = 3.3V, VOH = 2.4V 6.5 11

OH

V+ = 5.5V, VOH = 4.5V 12.5 18

= 400kHz

= 0

= 6mA 0.4 V

V+ = 2.3V 19 30

V+ = 3.3V 29 40Supply Current I+

V+ = 5.5V 65 80

V+ = 2.3V 1.5 3.4

V+ = 3.3V 1.7 3.9Standby Current

V+ = 5.5V 2.1 5

0.8 V

2V

-1 +1 µA

10 pF

0.8 V

2V

µA

µA

mA

mA

MAX7310

2-Wire-Interfaced 8-Bit I/O Port Expander

with Reset

_______________________________________________________________________________________ 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 MAX7310 bus timeout feature, which resets the serial bus interface if either

SDA or SCL is held low for a 30ms minimum.

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 of SCL’s falling edge.

Note 4: t

F

measured between 90% to 10% of V+.

Note 5: Input filters on the SDA and SCL inputs suppress noise spikes less than 50ns.

DC ELECTRICAL CHARACTERISTICS (continued)

(V+ = 2.3V to 5.5V, GND = 0, RESET = V+, 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+ = 2.3V to 5.5V, GND = 0, RESET = V+, TA = -40°C to +125°C, unless otherwise noted.) (Note 1)

Leakage Current -1 +1 µA

Input Capacitance 10 pF

PARAMETER SYM B O L CONDITIONS MIN TYP MAX UNITS

PARAMETER SYM B O L CONDITIONS MIN TYP MAX UNITS

SCL Clock Frequency f

BUS Timeout t

Bus Free Time Between STOP
and START Condition

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

SCL/SDA Fall Time (Transmitting) t

Pulse Width of Spike Supressed t

PORT TIMING

Output Data Valid t

Input Data Setup Time t

Input Data Hold Time t

RESET

Reset Pulse Width 100 ns

SCL

TIMEOUT

t

BUF

t

HD, STA

t

SU, STA

SU, STO

HD, DAT

SU, DAT

LOW

HIGH

(Note 2) 400 kHz

30 60 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 0.1 µs

Figure 2 1.3 µs

Figure 2 0.7 µs

Figure 2 (Note 4) 250 ns

F

(Note 5) 50 ns

SP

Figure 9 1 µs

PV

Figure 10 29 µs

PS

Figure 10 0 µs

PH

MAX7310

2-Wire-Interfaced 8-Bit I/O Port Expander
with Reset

4 _______________________________________________________________________________________

Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)

4

5

7

6

8

9

-40 -10 5 20-25 35 50 65 80 95 110 125

I/O1–I/O7 OUTPUT SOURCE CURRENT

vs. TEMPERATURE

MAX7310 toc06

TEMPERATURE (°C)

SOURCE CURRENT (mA)

V+ = 2.3V,
V

OH

= 1.4V

0

15

10

5

25

20

30

35

2.0 3.0 3.5 4.02.5 4.5 5.0 5.5

I/O0–I/O7 OUTPUT SINK CURRENT

vs. SUPPLY VOLTAGE

MAX7310 toc05

SUPPLY VOLTAGE (V)

SINK CURRENT (mA)

VOL = 0.5V

0

10

5

20

15

25

30

-40 -10 5 20-25 35 50 65 80 95 110 125

I/O0–I/O7 OUTPUT SINK CURRENT

vs. TEMPERATURE

MAX7310 toc04

TEMPERATURE (°C)

SINK CURRENT (mA)

VOL = 0.5V

VCC = 3.3V

VCC = 2.3V

10

40

20

60

70

2.0 3.0 3.5 4.02.5 4.5 5.0 5.5

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX7310 toc03

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (µA)

30

50

f

SCL

= 440kHz,

NO LOAD ON I/O0–I/O7

1.00

1.50

1.25

2.00

1.75

2.25

2.50

-40 -10 5 20-25 35 50 65 80 95 110 125

STANDBY SUPPLY CURRENT

vs. TEMPERATURE

MAX7310 toc02

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

V+ = 3.3V, f

SCL

= 0,

NO LOAD ON I/O0–I/O7

26

28

27

30

29

31

32

-40 -10 5 20-25 35 50 65 80 95 110 125

SUPPLY CURRENT

vs. TEMPERATURE

MAX7310 toc01

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

V+ = 3.3V, f

SCL

= 440kHz,

NO LOAD ON I/O0–I/O7

Detailed Description

The MAX7310 general-purpose input/output (GPIO)
peripheral provides up to eight I/O ports, controlled
through an I2C-compatible serial interface. The
MAX7310 consists of an input port register, an output

port register, a polarity inversion register, a configura­tion register, and a bus timeout register. An active-low
reset input sets the eight I/O lines as inputs. Three
slave ID address select pins (AD0, AD1, and AD2)
choose one of 56 slave ID addresses (Figure 1).

MAX7310

2-Wire-Interfaced 8-Bit I/O Port Expander

with Reset

_______________________________________________________________________________________________________ 5

Pin Description

Figure 1. MAX7310 Block Diagram

PIN

TSSOP/

QSOP

1 15 SCL Serial Clock Line

2 16 SDA Serial Data Line

3 1 AD0 Address Input 0

4 2 AD1 Address Input 1

5 3 AD2 Address Input 2

6 4 I/O0 Input/Output Port 0 (Open Drain)

7 5 I/O1 Input/Output Port 1

8 6 GND Supply Ground

9–14 7–12 I/O2–I/O7 Input/Output Port 2—Input/Output Port 7

15 13 RESET

16 14 V+ Supply Voltage. Bypass with a 0.047µF capacitor to GND.

— PAD

THIN

QFN

NAME FUNCTION

External Reset (Active Low). Pull RESET low to configure I/O pins as inputs. Set RESET
high for normal operation.

Exposed

pad

Exposed Pad on Package Underside. Connect to GND.

AD0

AD1

AD2

SCL

SDA

RESET

INPUT
FILTER

N

V+

POWER-ON

RESET

SMBus

CONTROL

WRITE PULSE

READ PULSE

GND

MAX7310

8 BIT

INPUT/

OUTPUT

PORTS

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