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

Detailed Description

Functional Overview

The MAX7328/MAX7329 are general-purpose port
expanders operating from a 2.5V to 5.5V supply that
provide eight open-drain input/output ports with a
20mA sink capability. The devices are rated to sink up
to 100mA at once, from any combination of ports. The
port outputs can drive loads connected to any voltage
up to the MAX7328/MAX7329’s supply voltage.

The MAX7328 is set to one of eight I2C slave addresses
0x20 to 0x27, and the MAX7329 is set to one of eight
I2C slave addresses, 0x38 to 0x3F, using the address
inputs AD2, AD1, and AD0. The parts are accessed
over an I2C serial interface up to 100kHz.

Any port can be configured as a logic input by setting the
port output logic-high. The MAX7328/MAX7329 do not
distinguish between a port used as an input and a port
used as an output that happens to be high. When a
MAX7328 or MAX7329 is read through the serial inter­face, the actual logic levels at the port pins are read back.

When an I/O port is high, an internal pullup to V+ is active.
The pullup is enabled only when the output is high, and is
turned off when the output is low to reduce quiescent cur­rent. An additional strong pullup to V+ allows fast-rising
edges into heavily loaded outputs. These strong pullups
turn on when an output is written high, and are switched
off by the falling edge of SCL (Figure 2).

The MAX7328/MAX7329 provide an open-drain output
(INT). An interrupt is generated by any rising or falling
edge of the port inputs in the input mode. After time, tIV,
the signal INT is valid.

Resetting and reactivating the interrupt circuit is
achieved when data on the port is changed to the origi­nal setting or data is read from or written to the port that
generated the interrupt.

Resetting occurs as follows:

• In the READ mode at the acknowledge bit after the
rising edge of the SCL signal

• In the WRITE mode at the acknowledge bit after the
HIGH-to-LOW transition of the SCL signal

MAX7328/MAX7329

I2C Port Expanders with Eight I/O Ports

_______________________________________________________________________________________ 5

Table 1. MAX7328 Slave ID Address Selection

PIN CONNECTION DEVICE ADDRESS PORTS POWER-UP DEFAULT

AD2 AD1 AD0

P0

GND GND GND

1

GND GND V+

1

GND V+ GND

1

GND V+ V+

1

V+ GND GND

1

V+ GND V+

1

V+ V+ GND

1

V+ V+ V+

1

Table 2. MAX7329 Slave ID Address Selection

A6 A5 A4 A3 A2 A1 A0 P7 P6 P5 P4 P3 P2 P1

01000001111111

01000011111111

01000101111111

01000111111111

01001001111111

01001011111111

01001101111111

01001111111111

PIN CONNECTION DEVICE ADDRESS PORTS POWER-UP DEFAULT

AD2 AD1 AD0 A6 A5 A4 A3 A2 A1 A0 P7 P6 P5 P4 P3 P2 P1 P0

GND GND GND 011100011111111

GND GND V+ 011100111111111

GND V+ GND 011101011111111

GND V+ V+ 011101111111111

V+ GND GND 011110011111111

V+ GND V+ 011110111111111

V+ V+ GND 011111011111111

V+ V+ V+ 011111111111111

MAX7328/MAX7329

Interrupts that occur during the acknowledge clock
pulse may be lost (or very short) due to the resetting of
the interrupt during this pulse. Each change of the I/Os
after resetting is detected and, after the next rising
clock edge, is transmitted as INT.

MAX7328/MAX7329 Initial Power-Up

On power-up, the power-up default states of the eight
I/O ports are high, and therefore, can be used as inputs
or outputs. The interrupt output INT is reset, and INT
goes high (high impedance if an external pullup resistor
is not fitted).

Serial Interface

Serial Addressing

The MAX7328/MAX7329 operate as slave devices that
send and receive data through an I2C-compatible,
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 initiates all data transfers to and from the
MAX7328 or MAX7329, and generates the SCL clock
that synchronizes the data transfer (Figure 3).

The MAX7328 or MAX7329 SDA line operates as both
an input and an open-drain output. A pullup resistor,

I2C Port Expanders with Eight I/O Ports

6 _______________________________________________________________________________________

SCL

SDA

START CONDITION

R/W

ACKNOWLEDGE
FROM SLAVE

SLAVE ADDRESS

S0

12345678

AAAP

P3P3

I

OH

10

P3

OUTPUT

VOLTAGE

P3 PULLUP

OUTPUT CURRENT

I

OHt

DATA TO PORT DATA TO PORT

Figure 2. Repeated Write Operation Showing Transient Pullup Current

SCL

SDA

t

R

t

F

t

BUF

START

CONDITION

STOP

CONDITION

REPEATED START CONDITION

START CONDITION

t

SU, STO

t

HD, STA

t

SU, STA

t

VD, DAT

t

HD, DAT

t

SU, DAT

t

LOW

t

HIGH

t

HD, STA

Figure 3. 2-Wire Serial-Interface Timing Details

typically 4.7kΩ, is required on SDA. The MAX7328 or
MAX7329 SCL line operates only as an input. A pullup
resistor, typically 4.7kΩ, is required on SCL if there are
multiple masters on the 2-wire interface, or if the master
in a single-master system has an open-drain SCL output.

Each transmission consists of a START condition
(Figure 4) sent by a master, followed by the MAX7328
or MAX7329 7-bit slave address plus R/W bit, a register
address byte, one or more data bytes, and finally a
STOP condition (Figure 4).

START and STOP Conditions

Both SCL and SDA remain high when the interface is
not busy. A master signals the beginning of a transmis­sion with a START (S) condition by transitioning SDA
from high to low while SCL is high. When the master
has finished communicating with the slave, it issues a
STOP (P) condition by transitioning SDA from low to
high while SCL is high. The bus is then free for another
transmission (Figure 4).

Bit Transfer

One data bit is transferred during each clock pulse.
The data on SDA must remain stable while SCL is high
(Figure 5).

Acknowledge

The acknowledge bit is a clocked ninth bit, which the
recipient uses to handshake receipt of each byte of
data (Figure 6). Thus, each byte transferred effectively
requires 9 bits. The master generates the ninth clock
pulse, and the recipient pulls down SDA during the
acknowledge clock pulse, so the SDA line is stable low
during the high period of the clock pulse. When the
master is transmitting to the MAX7328 or MAX7329, the
MAX7328 or MAX7329 generates the acknowledge bit
because the MAX7328 or MAX7329 is the recipient.
When the MAX7328 or MAX7329 is transmitting to the
master, the master generates the acknowledge bit
because the master is the recipient.

Slave Address

The MAX7328/MAX7329 have a 7-bit long slave
address (Figure 7). The eighth bit, following the 7-bit
slave address, is the R/W bit. It is low for a write com­mand, high for a read command.

MAX7328/MAX7329

I2C Port Expanders with Eight I/O Ports

_______________________________________________________________________________________ 7

SDA

SCL

START

CONDITION

STOP

CONDITION

SP

Figure 4. START and STOP Conditions

SDA

SCL

DATA LINE STABLE;

DATA VALID

CHANGE OF DATA

ALLOWED

Figure 5. Bit Transfer

SCL

SDA BY

TRANSMITTER

CLOCK PULSE

FOR ACKNOWLEDGEMENT

START

CONDITION

SDA BY

RECEIVER

12 89

S

Figure 6. Acknowledge

SDA

SCL

A5

MSB

LSB

ACKA4 A1A6 A3 A0A2 R/W

Figure 7. Slave Address

MAX7328/MAX7329

The first (A6), second (A5), third (A4), and fourth (A3)
bits of the MAX7328 slave address are always 0, 1, 0,
and 0. Slave address bits A2, A1, and A0 are selected
by the address inputs AD2, AD1, and AD0. These pins
can be connected to GND or V+. The MAX7328 has
eight possible slave addresses (Table 1), and there­fore, a maximum of eight MAX7328 devices can be
controlled independently from the same interface.

The first (A6), second (A5), third (A4), and fourth (A3)
bits of the MAX7329 slave address are always 0, 1, 1,
and 1. Slave address bits A2, A1, and A0 are selected
by the address inputs AD2, AD1, and AD0. These pins
can be connected to GND or V+. The MAX7329 has
eight possible slave addresses (Table 2), and therefore,
a maximum of eight MAX7329 devices can be controlled
independently from the same interface.

Because the MAX7328 has a different range of slave
address selections than the MAX7329, a total of eight
MAX7328 devices and eight MAX7329 devices can be
connected to the same bus and independently controlled.

Reading and Writing

the MAX7328 and MAX7329

I2C interface access to the MAX7328/MAX7329 is as
follows:

A single-byte read from the MAX7328 or MAX7329
returns the status of the eight ports (with output ports
read back as inputs), and clears the INT output.

A 2-byte read from the MAX7328 or MAX7329 returns
the status of the eight ports (with output ports read
back as inputs) and clears the INT output.

A multibyte read repeatedly returns the input port data.

Input port data is sampled during the preceding I

2

C
acknowledge bit, which is the acknowledge bit for the
I2C slave address in the case of a single-byte or
2-byte read.

A single-byte write to the MAX7328 or MAX7329 sets
the eight ports to high or low, depending on the data
byte content. Bit locations of a write byte, corresponding
to ports intended for input usage, contain high values.

A multibyte write to the MAX7328 or MAX7329 repeat­edly sets the logic state of all eight I/O ports.

Reading from the MAX7328

and MAX7329

A read from the MAX7328 or MAX7329 starts with the
master transmitting the MAX7328’s or MAX7329’s slave
address with the R/W bit set high. The MAX7328 or
MAX7329 acknowledges the slave address, and samples
the input ports (takes a snapshot) during acknowledge.

Typically, the master reads 1 or 2 bytes from the MAX7328
or MAX7329, each byte being acknowledged by the mas­ter on reception, with exception of the last byte.

The master can read 1 byte from the MAX7328 or
MAX7329 and then issue a STOP condition (Figure 8). In
this case, the MAX7328 or MAX7329 transmits the cur­rent port data, and restarts the transition detection. INT
goes high (high impedance if an external pullup resistor
is not fitted) during the port data-byte acknowledge. The
new snapshot data is the current port data transmitted
to the master, and therefore, any port changes that

I2C Port Expanders with Eight I/O Ports

8 _______________________________________________________________________________________

SCL

MAX7328/MAX7329 SLAVE ADDRESS

SA

P

1

PORT INPUT DATA

INT OUTPUT

R/W

PORT SNAPSHOT DATA

PORT SNAPSHOT TAKEN

S = START CONDITION SHADED = SLAVE TRANSMISSION
P = STOP CONDITION N = NOT ACKNOWLEDGE

DATA 1 DATA 2 DATA 3

t

IV

t

PH

t

IR

N

P0P1P2P3P4P5P6P7

D0D1D2

DATA 1

D3D4D5D6D7

PORT SNAPSHOT TAKEN

t

PSU

t

IR

t

IV

Figure 8. Reading from the MAX7328/MAX7329 (1 Data Byte)

occur during the transmission are detected. INT always
remains high until a STOP condition.

The master can read 2 bytes from the MAX7328 or
MAX7329 and then issue the STOP condition (Figure 9).
In this case, the MAX7328 or MAX7329 transmits the cur­rent port data repeatedly. INT goes high during the port
data-byte acknowledge. The new snapshot data is the
current port data transmitted to the master; therefore,
any port transitions that occur during the transmission
are detected. INT remains high until the STOP condition.

Writing to the MAX7328/MAX7329

A data write to the MAX7328 or MAX7329 comprises the
transmission of the MAX7328’s or MAX7329’s slave
address with the R/W bit set to zero, followed by one or
more bytes of data. The MAX7328 or MAX7329 acknowl­edges the slave address and any subsequent bytes of
data until the master issues a STOP condition (Figure 10).

Applications Information

Hot Insertion

The MAX7328/MAX7329’s SDA, SCL, AD0, AD1, AD2,
RST, and P0–P7 I/Os remain high impedance with up to
+6V asserted on them when the MAX7328 or MAX7329 is
powered down (V+ = 0V). The MAX7328/MAX7329 can
therefore be used in hot-swap applications.

Each of the I/O ports P0–P7 has protection diodes to V+
and GND. When a port output is back driven to a volt­age higher than V+ or lower than GND, the appropriate
protection diode clamps the output to a diode drop
above V+ or below GND. When a MAX7328 or MAX7329
is powered down (V+ = 0V), each output port’s protec­tion diodes to V+ and GND continue to appear as a
diode clamp from each output to GND (Figure 1).

Power-Supply Considerations

The MAX7328/MAX7329 operate with a 2.5V to 5.5V
power-supply voltage over the -40°C to +125°C temper­ature range. Bypass the power supply to GND with a
ceramic capacitor of at least 0.047µF as close to the
device as possible.

Chip Information

PROCESS: BiCMOS

MAX7328/MAX7329

I2C Port Expanders with Eight I/O Ports

_______________________________________________________________________________________ 9

SCL

MAX7328/MAX7329 SLAVE ADDRESSSA P1

PORT INPUT DATA DATA 1 DATA 2 DATA 3 DATA 4

DATA 1 DATA 4

INT OUTPUT

R/W

ACKNOWLEDGE FROM MAX7328/MAX7329

PORT SNAPSHOT
TAKEN

t

IV

t

PH

t

IR

t

IV

A

P7 P6 P4P5 P3 P2 P1 P0

D0D1D2D3D4D5D6D7

PORT SNAPSHOT

TAKEN

t

PSU

P0

P1

P2P3P4P5

P6

P7

D7 D6 D5 D4 D3 D2 D1 D0 A

PORT SNAPSHOT

TAKEN

PORT
SNAPSHOT DATA

PORT SNAPSHOT DATA

ACKNOWLEDGE FROM
MASTER

ACKNOWLEDGE FROM
MASTER

t

IR

S = START CONDITION SHADED = SLAVE TRANSMISSION
P = STOP CONDITION N = NOT ACKNOWLEDGE

Figure 9. Reading from the MAX7328/MAX7329 (2 Data Bytes)

MAX7328/MAX7329

I2C Port Expanders with Eight I/O Ports

10 ______________________________________________________________________________________

SCL

SDA

START CONDITION R/W ACKNOWLEDGE

FROM SLAVE

SLAVE ADDRESS

S0

12345678

t

PV

DATA 1 DATA 2

DATA 2 VALIDDATA 1 VALID

INTERNAL WRITE

TO PORT

DATA OUT

FROM PORT

ACKNOWLEDGE
FROM SLAVE

ACKNOWLEDGE
FROM SLAVE

t

PV

DATA TO PORT DATA TO PORT

A A A

Figure 10. Writing to the MAX7328/MAX7329

20

19

18

17

16

15

14

1

2

3

4

5

6

7

P7

P6

N.C.

P5SDA

N.C.

SCL

INT

TOP VIEW

MAX7328
MAX7329

P4

GND

P3A1

A0

138 N.C.N.C.

129P2A2

1110 P1P0

V+

TSSOP/SSOP

+

Pin Configurations (continued)

Selector Guide

PART

I2C BUS RST

INPUTS

LATCHING

OPEN-DRAIN

OUTPUTS

PUSH-PULL

OUTPUTS

SECOND SOURCE

MAX7319 Yes 8 Yes — — —

MAX7320 Yes — Yes — 8 —

MAX7321 Yes Up to 8 Yes Up to 8 — —

MAX7322 Yes 4 Yes — 4 —

MAX7323 Yes Up to 4 Yes Up to 4 4 —

MAX7328 — Up to 8 — Up to 8 — PCF8574

MAX7329 — Up to 8 — Up to 8 — PCF8574A

INTERRUPT

MAX7328/MAX7329

I2C Port Expanders with Eight I/O Ports

______________________________________________________________________________________ 11

Package Information

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages

.)

SOICW.EPS

PACKAGE OUTLINE, .300" SOIC

1

1

21-0042

B

REV.DOCUMENT CONTROL NO.APPROVAL

PROPRIETARY INFORMATION

TITLE:

TOP VIEW

FRONT VIEW

MAX

0.012

0.104

0.019

0.299

0.013

INCHES

0.291

0.009

E

C

DIM

0.014

0.004

B

A1

MIN

0.093A

0.23

7.40 7.60

0.32

MILLIMETERS

0.10

0.35

2.35

MIN

0.49

0.30

MAX

2.65

0.050

0.016L

0.40 1.27

0.5120.496D

D

MINDIM

D

INCHES

MAX

12.60 13.00

MILLIMETERS

MIN

MAX

20

AC

0.447 0.463 AB11.7511.35 18

0.398 0.413 AA10.5010.10 16

N MS013

SIDE VIEW

H0.4190.394 10.00 10.65

e0.050 1.27

D0.6140.598 15.20 2415.60 AD
D0.7130.697 17.70 2818.10 AE

H

E

N

D

A1

B

e

A

0∞-8∞

C

L

1

VARIATIONS:

Package Information (continued)

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages

.)

MAX7328/MAX7329

I2C Port Expanders with Eight I/O Ports

12 ______________________________________________________________________________________

TSSOP4.40mm.EPS

PACKAGE OUTLINE, TSSOP 4.40mm BODY

21-0066

1

1

G

MAX7328/MAX7329

I2C Port Expanders with Eight I/O Ports

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 13

© 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.

Package Information (continued)

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages

.)

SSOP.EPS

PACKAGE OUTLINE, SSOP, 5.3 MM

1

1

21-0056

C

REV.DOCUMENT CONTROL NO.APPROVAL

PROPRIETARY INFORMATION

TITLE:

NOTES:

1. D&E DO NOT INCLUDE MOLD FLASH.

2. MOLD FLASH OR PROTRUSIONS NOT TO EXCEED .15 MM (.006").

3. CONTROLLING DIMENSION: MILLIMETERS.

4. MEETS JEDEC MO150.

5. LEADS TO BE COPLANAR WITHIN 0.10 MM.

7.90

H

L

0∞

0.301

0.025

8∞

0.311

0.037

0∞

7.65

0.63

8∞

0.95

MAX

5.38

MILLIMETERS

B

C

D

E

e

A1

DIM

A

SEE VARIATIONS

0.0256 BSC

0.010

0.004

0.205

0.002

0.015

0.008

0.212

0.008

INCHES

MIN

MAX

0.078

0.65 BSC

0.25

0.09

5.20

0.05

0.38

0.20

0.21

MIN

1.73 1.99

MILLIMETERS

6.07

6.07

10.07

8.07

7.07

INCHES

D
D

D

D

D

0.239

0.239

0.397

0.317

0.278

MIN

0.249

0.249

0.407

0.328

0.289

MAX

MIN

6.33

6.33

10.33

8.33

7.33

14L
16L

28L

24L

20L

MAX

N

A

D

e

A1

L

C

HE

N

12

B

0.068