MAXIM MAX7318 User Manual

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General Description

The MAX7318 2-wire-interfaced expander provides 16­bit parallel input/output (I/O) port expansion for
SMBus™ and I2C™ applications. The MAX7318 con­sists of input port registers, output port registers, polari­ty inversion registers, configuration registers, a bus
timeout register, and an I2C-compatible serial interface
logic compatible with SMBus. The system master can
invert the MAX7318 input data by writing to the active­high polarity inversion 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 MAX7318 supports hot insertion. All port pins, the
INT output, SDA, SCL, and the slave address inputs
AD0–2 remain high impedance in power-down (V+ =
0V) with up to 6V asserted upon them.

The MAX7318 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.

For applications requiring an SMBus timeout function,
refer to the MAX7311 data sheet.

Applications

Servers
RAID Systems
Industrial Control
Medical Equipment
PLCs
Instrumentation and Test Measurement

Features

♦ 400kbps I2C-Compatible Serial Interface

♦ 2V to 5.5V Operation

♦ 5.5V Overvoltage-Tolerant I/Os

♦ Supports Hot Insertion

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

♦ 100kΩ Pullup on Each I/O
♦ Open-Drain Interrupt Output (INT)

♦ Noise Filter on SCL/SDA Inputs

♦ 64 Slave ID Addresses Available

♦ Low Standby Current (5.4µA typ)

♦ Polarity Inversion

♦ 4mm

✕ 4mm, 0.8mm Thin QFN Package

♦ -40°C to +125°C Operation

MAX7318

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

with Interrupt and Hot-Insertion Protection

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-3381; Rev 2; 4/05

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.

SMBus is a trademark of Intel Corp.

I

2

C is a trademark of Philips Corp.

Purchase of I

2

C components from 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.

Pin Configurations

TOP VIEW

1

INT

AD1

2

AD2

3

4

I/O1

5

I/O2

6

I/O3

7

8

9

I/O5

10

I/O6

11

I/O7

12

TSSOP/SSOP/SO

MAX7318

I/O15

I/O14

MAX7318ATG

I/O1

I/O2

THIN QFN

I/O13

I/O3

I/O12

I/O4

AD0

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

18 17 16 15 14 13

19

SCL

20

SDA

21

V+

INT

22

AD1

23

AD2

24

12 3456

I/O0

I/O11

I/O5

12

I/O10

11

I/O9

10

I/O8

GND

9

I/O7

8

I/O6

7

MAX7318AWG -40°C to +125°C 24 Wide SO —

MAX7318AAG -40°C to +125°C 24 SSOP —

MAX7318ATG -40°C to +125°C

MAX7318AUG -40°C to +125°C 24 TSSOP —

PART TEMP RANGE PIN-PACKAGE

24 Thin QFN

✕ 4mm)

(4mm

PKG

CODE

T2444-4

MAX7318

2-Wire-Interfaced, 16-Bit, I/O Port Expander
with Interrupt and Hot-Insertion Protection

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) .......976mW

24-Pin Thin QFN (derate 20.8mW/°C above +70°C) .1667mW

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+ 2.0 5.5 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

IO

= V+

V+ = 2V 24 36

V+ = 3.3V 45 62Supply Current I

V+ = 5.5V 83 124

V+ = 2V 4.8 12.1

V+ = 3.3V 5.4 14.4Standby Current I

V+ = 5.5V 6.4 19.4

1.4 1.7 V

0.3 x V+

0.7 x V+ V

-1 +1 µA

0.8 V

1.8 V

1µA

0.3 x V+ V

0.7 x V+ V

µA

µA

V

mA

mA

MAX7318

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

with Interrupt and Hot-Insertion Protection

_______________________________________________________________________________________ 3

Note 1: All parameters are 100% production tested at TA= +25°C. Specifications over temperature are guaranteed by design.
Note 2: 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) to bridge the undefined region SCL’s falling edge.

Note 3: C

B

= total capacitance of one bus line in pF.

Note 4: 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 5: 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 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

t

BUF

t

HD,STA

t

SU,STA

SU,STO

HD,DAT

SU,DAT

LOW

HIGH

F

SP

PV

IV

IR

Figure 2 1.3 µs

Figure 2 0.6 µs

Figure 2 0.6 µs

Figure 2 0.6 µs

Figure 2 (Note 2) 0.9 µs

Figure 2 100 ns

Figure 2 1.3 µs

Figure 2 0.7 µs

Figure 2 (Notes 3, 4)

(Note 5) 50 ns

Figure 7 3 µs

Figure 9 30.5 µs

Figure 9 2 µs

V+ < 3.3V 500

V+ ≥ 3.3V 250

400 kHz

ns

MAX7318

2-Wire-Interfaced, 16-Bit, I/O Port Expander
with Interrupt and Hot-Insertion Protection

4 _______________________________________________________________________________________

Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)

SUPPLY CURRENT

vs. TEMPERATURE

MAX7318 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

MAX7318 toc02

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

1007525 500-25

2

4

6

8

10

12

0

-50 125

SCL = V+
ALL I/Os UNLOADED

V+ = 5V

V+ = 3.3V

V+ = 2V

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX7318 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

MAX7318 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

MAX7318 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

MAX7318 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

MAX7318 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

MAX7318 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

MAX7318 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

MAX7318

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

with Interrupt and Hot-Insertion Protection

_______________________________________________________________________________________ 5

Pin Description

Typical Operating Characteristics (continued)

(TA = +25°C, unless otherwise noted.)

I/O SOURCE CURRENT

vs. OUTPUT HIGH VOLTAGE

MAX7318 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

MAX7318 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+ Supply Voltage. Bypass with a 0.047µF capacitor to GND.

— — EP Exposed Pad on Package Underside. Connect to GND.

NAME FUNCTION