MAXIM MAX7328, MAX7329 User Manual

General Description

The MAX7328/MAX7329 are 2-wire serial-interfaced
peripherals with eight I/O ports. Any port can be used
as a logic input or an open-drain output.

All input ports are continuously monitored for state
changes (transition detection). Transitions are alerted
through the open-drain, 5.5V-tolerant INT output.

The MAX7328 and MAX7329 versions differ only by their
slave ID address ranges. The MAX7328 has a slave ID
range of 0100xxx (0x20 to 0x27). The MAX7329 has a
slave ID range of 0111xxx (0x38 to 0x3F).

For a similar part with overvoltage-protected I/Os and a
bus RST input that clears the I

2

C serial interface, refer to
the MAX7321 data sheet. The MAX7328/MAX7329 are
members of a family of pin-compatible port expanders
with a choice of input ports, open-drain I/O ports, and
push-pull output ports (see the Selector Guide).

Applications

Automotive

RAID

Servers

Notebooks

Industrial

Features

♦ 100kHz, 5.5V-Tolerant, I2C-Compatible Serial

Interface

♦ 2.5V to 5.5V Operating Supply Voltage Range

♦ Low-Standby-Current Consumption of 10µA (max)

♦ I

2

C Bus-to-Parallel-Port Expander

♦ Open-Drain Interrupt Output INT

♦ 8-Bit Remote I/O Port for the I

2

C Bus

♦ Latched Outputs with High-Current-Drive

Capability for Directly Driving LEDs

♦ Address by Three Hardware Address Pins for Use

of Up to Eight Devices (Up to 16 Using Both
MAX7328/MAX7329)

♦ -40°C to +125°C Automotive Temperature Range

♦ Second Sources to PCF8574 and PCF8574A

MAX7328/MAX7329

I2C Port Expanders with Eight I/O Ports

________________________________________________________________ Maxim Integrated Products 1

TOP VIEW

16

15

14

1

2

3

4

5

6

7

V+

SDA

SCL

INTP0

AD2

AD1

AD0

MAX7328
MAX7329

P7

P6

P5P3

P2

13

8P4GND

12

11

10

9

P1

WIDE SO

+

Pin Configurations

Ordering Information

MAX7328
MAX7329

P5

P0
P1
P2
P3

V+

GND

+2.5V TO +5.5V

μC

SCL

SCL

SDA

AD1

AD0

P6
P7

SDA

P4

I/O
I/O

AD2

INT

I/O
I/O

I/O
I/O
I/O
I/O

INT

47nF

Typical Application Circuit

19-3829; Rev 0; 10/05

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.

*Future product—contact factory for availability.

Pin Configurations continued at end of data sheet.

PART TEMP RANGE

PIN­PACKAGE

PKG
CODE

MAX7328AWE

W16-1

MAX7328AAP

20 SSOP A20-5

MAX7328AUP*

20 TSSOP —

MAX7329AWE

W16-1

MAX7329AAP

20 SSOP A20-5

MAX7329AUP*

20 TSSOP —

Devices are available in both leaded and lead-free packaging.
Specify lead free by adding the + symbol at the end of the part
number when ordering.

-40°C to +125°C 16 Wide SO

-40°C to +125°C

-40°C to +125°C

-40°C to +125°C 16 Wide SO

-40°C to +125°C

-40°C to +125°C

MAX7328/MAX7329

I2C Port Expanders with Eight I/O Ports

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(Typical Operating Circuit, V+ = 2.5V to 5.5V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at V+ = 5V, 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.

(Voltage with respect to GND.)

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

P0–P7 ...........................................................-0.3V to (V+ + 0.3V)

P0–P7, SDA, INT Output Sink Current ................................25mA

SCL, SDA, AD0, AD1, AD2, INT, P0–P7 Input Current .......20mA

Total V+ Current................................................................100mA

Total GND Current ............................................................100mA

Continuous Power Dissipation (TA= +70°C)

16-Pin Wide SO (derate 9.5mW/°C over +70°C) .........762mW

20-Pin SSOP (derate 8mW/°C over +70°C) .................640mW

20-Pin TSSOP (derate 11mW/°C over +70°C) .............879mW

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

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Operating Supply Voltage V+ 2.5 5.5 V

Supply Current (Interface
Running)

I+

f

SCL

= 100kHz, other digital inputs at V+ or

GND

40 100 µA

Standby Current (Interface Idle) I+

110µA

Power-On Reset Voltage V

POR

1.3 2.4 V

Inp ut Low V ol tag e

S D A, S C L, AD 0, AD 1, AD 2, P 0–P 7

V

IL

0.3 x
V+

V

Inp ut H i g h V ol tag e

S D A, S C L, AD 0, AD 1, AD 2, P 0–P 7

V

IH

0.7 x
V+

V

Maximum Allowed Input Current
through Protection Diode P0–P7

I

PPROT

µA

Output Low Current SDA I

OLSDAVSDA

= 0.4V 3 mA

Inp ut Leakag e C ur r ent

S D A, S C L, AD 0, AD 1, AD 2, P 0–P 7

IIH, I

IL

Pin at V+ or GND

µA

Input Capacitance
SDA, SCL, AD0, AD1, AD2

C

I2C

Pin at GND (Note 2) 7 pF

Port Output-Low Output Current
P0–P7

I

OL

VOL = 1V, V+ = 5V 10 25 mA

Ports Output-High Output Current

P0–P7

I

OH

VOH = GND 30 300 µA

Output-High Transient Pullup
Current P0–P7

I

OHt

Sources during acknowledge, VOH = GND,
V+ = 2.5V

1mA

Input Capacitance P0–P7 C

P

(Note 2) 10 pF

Interrupt Output-Low Current INT

I

OLINT

V

OLINT

= 0.4V 1.6 mA

S C L, S DA, and other d i gi tal i nputs at V+ or GN D

-0.25 +0.25

±400

MAX7328/MAX7329

I2C Port Expanders with Eight I/O Ports

_______________________________________________________________________________________ 3

Note 1: All parameters are tested at TA= +25°C. Specifications over temperature are guaranteed by design.
Note 2: Guaranteed by design.
Note 3: A master device must provide a hold time of at least 300ns for the SDA signal (referred to V

IL

of the SCL signal) to bridge

the undefined region of SCL’s falling edge.

PORT AND INTERRUPT INT TIMING CHARACTERISTICS

(Typical Operating Circuit, V+ = 2.5V to 5.5V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at V+ = 5V, TA= +25°C.)

(Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Port Output Data Valid t

PPV

CL ≤ 100pF 4 µs

Port Input Setup Time t

PSU

CL ≤ 100pF 0 µs

Port Input Hold Time t

PH

CL ≤ 100pF 4 µs

INT Input Data Valid Time t

IV

CL ≤ 100pF 4 µs

INT Reset Delay Time from
Acknowledge

t

IR

CL ≤ 100pF 4 µs

TIMING CHARACTERISTICS

(Typical Operating Circuit, V+ = 2.5V to 5.5V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at V+ = 5V, TA= +25°C.)

(Note 1)

PARAMETER

CONDITIONS

UNITS

Serial Clock Frequency f

SCL

100 kHz

Tolerable Spike Width on Bus t

SP

(Note 2) 100 ns

Bus Free Time between STOP
and START

t

BUF

4.7 µs

START or Repeated START Setup
Time

4.7 µs

START or Repeated START Hold
Time

4µs

SCL Clock Low Period t

LOW

4.7 µs

SCL Clock High Period t

HIGH

4µs

SDA and SCL Rise Time t

R

(Note 2) 1 µs

SDA and SCL Fall Time t

F

(Note 2) 300 ns

Data Setup Time

ns

Data Hold Time

(Note 3) 0.9 µs

SCL Low to Data-Out Valid

SCL low to SDA output valid 3.4 µs

STOP Condition Setup Time

4µs

C

b

(Note 2) 400 pF

SYMBOL

t

SU, STA

MIN TYP MAX

C ap aci ti ve Load for E ach Bus Li ne

t

HD, STA

t

SU, DAT

t

HD, DAT

t

VD, DAT

t

SU, STO

250

Pin Description

MAX7328/MAX7329

I2C Port Expanders with Eight I/O Ports

4 _______________________________________________________________________________________

V+

P0–P7

100µA

GND

CLK

DQ

FF

S

CLK

DQ

WRITE PULSE

READ PULSE

DATA FROM

SHIFT REGISTER

DATA TO

SHIFT REGISTER

POWER-ON

RESET

FF

S

TO INTERRUPT
LOGIC

MAX7328
MAX7329

Figure 1. Block Diagram

PIN

SO

NAME FUNCTION

1, 2, 3 6, 7, 9

AD0, AD1,

AD2

Address Inputs. AD0, AD1, and AD2 set device slave address. Connect AD0, AD1,
and AD2 to either GND or V+. See Tables 1 and 2.

4–7, 9–12

10, 11, 12, 14,

P0–P7 Input/Output Ports. P0–P7 are open-drain I/Os.

815GND Ground

13 1 INT Interrupt Output. INT is an open-drain output rated at 5.5V.

14 2 SCL I2C-Compatible Serial-Clock Input

15 4 SDA I2C-Compatible Serial-Data I/O

16 5 V+ Positive Supply Voltage. Bypass V+ to GND with a 0.047µF ceramic capacitor.

— 3, 8, 13, 18 N.C. No Connection. Internally not connected.

SSOP/TSSOP

16, 17, 19, 20