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MAX7325

I

2

C Port Expander with 8 Push-Pull

and 8 Open-Drain I/Os

General Description

The MAX7325 2-wire serial-interfaced peripheral features

16 I/O ports. Ports are divided into eight push-pull outputs

and eight I/Os with selectable internal pullups and transition

detection. Eight ports are push-pull outputs and eight I/Os

may be used as a logic input or an open-drain output.

Ports are overvoltage protected to +6V.

All I/O ports configured as inputs are continuously monitored

for state changes (transition detection). State changes are

indicated by the

INT

output. The interrupt is latched, allowing

detection of transient changes. When the MAX7325 is

subsequently accessed through the serial interface, any

pending interrupt is cleared. The open-drain outputs are

rated to sink 20mA, and are capable of driving LEDs. The

RST

input clears the serial interface, terminating any I

2

C

communication to or from the MAX7325.

The MAX7325 uses two address inputs with four-level

logic to allow 16 I

2

C slave addresses. The slave address

also determines the power-up logic state for the I/O ports,

and enables or disables internal 40kΩ pullups in groups

of four ports.

The MAX7325 is one device in a family of pin-compatible

port expanders with a choice of input ports, open-drain

I/O ports, and push-pull output ports (see

Table 1).

The MAX7325 is available in 24-pin QSOP and TQFN

packages and is specified over the -40°C to +125°C

automotive temperature range.

Benefits and Features

●

+1.71V to +5.5V Operation

●

8 Push-Pull Outputs

●

400kHz I

2

C Serial Interface

●

8 Open-Drain I/O Ports, Rated to 20mA Sink Current

●

I/O Ports are Overvoltage Protected to +6V

●

Selectable I/O Port Power-Up Default Logic States

●

Transient Changes are Latched, Allowing Detection

Between Read Operations

●

INT

Output Alerts Change on Inputs

●

AD0 and AD2 Inputs Select from 16 Slave Addresses

●

Low 0.6µA (typ) Standby Current

●

-40°C to +125°C Temperature Range

Ordering Information

PART

MAX7325AEG+

MAX7325AEG/V+

MAX7325ATG+

TEMP RANGE

-40°C to +125°C

PIN-PACKAGE

24 QSOP

24 TQFN-EP*

(4mm x 4mm)

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed paddle.

/V Denotes an automotive qualified part.

Applications

●

Cell Phones

●

SAN/NAS

●

Servers

●

Notebooks

●

Satellite Radio

●

Automotive

Selector Guide

PART

MAX7324

INTERRUPT

INPUTS

MASK

8

Up to 8

4

Up to 4

Yes

—

Yes

—

OPEN-

PUSH-PULL

DRAIN

OUTPUTS

—

Up to 8

—

Up to 4

8

12

Pin Configurations

AD0

O15

O14

O13

O12

O11

TOP VIEW

MAX7325

12 O10

11 O9

10 O8

18

SCL 19

SDA 20

V+ 21

INT

22

RST

23

AD2 24

17

16

15

14

13

MAX7326

MAX7327

MAX7325

EXPOSED PADDLE

2

P1

3

P2

4

P3

5

P4

6

P5

9

8

7

GND

P7

P6

+

1

P0

Typical Application Circuit

and

Functional Diagram

appear

at end of data sheet.

TQFN (4mm x 4mm)

Pin Configurations

continued at end of data sheet.

19-3807; Rev 2; 12/15

MAX7325

I

2

C Port Expander with 8 Push-Pull

and 8 Open-Drain I/Os

Absolute Maximum Ratings

(All voltages referenced to GND.)

Supply Voltage V+ ...................................................-0.3V to +6V

SCL, SDA, AD0, AD2,

RST, INT,

P0–P7 ................-0.3V to +6V

O8–O15 .......................................................-0.3V to (V+ + 0.3V)

O8–O15 Output Current ...................................................±25mA

P0–P7 Sink Current............................................................25mA

SDA Sink Current .............................................................. 10mA

INT

Sink Current.................................................................10mA

Total V+ Current .................................................................50mA

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

Continuous Power Dissipation (T

A

= +70°C)

24-Pin QSOP (derate 9.5mW/°C over +70°C) .........761.9mW

24-Pin TQFN (derate 20.8mW/°C over+70°C) .......1666.7mW

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

Soldering Temperature (reflow) .......................................+260°C

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.

DC Electrical Characteristics

PARAMETER

Operating Supply Voltage

Power-On-Reset Voltage

Standby Current

(Interface Idle)

Supply Current

(Interface Running)

Input High-Voltage

SDA, SCL, AD0, AD2,

RST,

P0–P7

Input Low-Voltage

SDA, SCL, AD0, AD2,

RST,

P0–P7

Input Leakage Current

SDA, SCL, AD0, AD2,

RST,

P0–P7

Input Capacitance

SDA, SCL, AD0, AD2,

RST,

P0–P7

(V+ = +1.71V to +5.5V, T

A

= -40°C to +125°C, unless otherwise noted. Typical values are at V+ = +3.3V, T

A

= +25°C.) (Note 1)

SYMBOL

V+

V

POR

I

STB

I+

V

IH

V

IL

I

IH

, I

IL

V+ falling

CONDITIONS

T

A

= -40°C to +125°C

SCL and SDA and other T

A

= -40°C to

digital inputs at V+

+125°C

f

SCL

= 400kHz; other

digital inputs at V+

V+ < 1.8V

V+ ≥ 1.8V

V+ < 1.8V

V+ ≥ 1.8V

SDA, SCL, AD0, AD2,

RST,

P0–P7 at V+ or

GND, internal pullup disabled

-0.2

10

V+ = +1.71V, I

SINK

= 5mA (QSOP)

V+ = +1.71V, I

SINK

= 5mA (TQFN)

Output Low Voltage

O8–O15, P0–P7

V+ = +2.5V, I

SINK

= 10mA (TQFN)

V+ = +3.3V, I

SINK

= 15mA (TQFN)

V+ = +5V, I

SINK

= 20mA (QSOP)

V+ = +5V, I

SINK

= 20mA (TQFN)

V+ = +1.71V, I

SOURCE

= 2mA

V+ = +2.5V, I

SOURCE

= 5mA

Output High Voltage

O8–O15

Output Low-Voltage SDA

Output Low-Voltage

INT

Port Input Pullup Resistor

V

OH

V

OLSDA

V

OLINT

R

PU

V+ = +3.3V, I

SOURCE

= 5mA

V+ = +5V, I

SOURCE

= 10mA

I

SINK

= 6mA

I

SINK

= 5mA

V+ = +2.5V, I

SINK

= 10mA (QSOP)

V

OL

V+ = +3.3V, I

SINK

= 15mA (QSOP)

90

110

130

140

V+ - 250

V+ - 360

V+ - 260

V+ - 360

V+ - 30

V+ - 70

V+ - 100

V+ - 120

250

130

25

40

250

55

mV

kΩ

mV

180

230

210

260

230

280

250

300

mV

TA = -40°C to

+125°C

0.8 x V+

0.7 x V+

0.2 x V+

0.3 x V+

+0.2

MIN

1.71

0.6

23

TYP

MAX

5.50

1.6

1.9

55

UNITS

V

µA

V

µA

pF

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Maxim Integrated

│

2

MAX7325

I

2

C Port Expander with 8 Push-Pull

and 8 Open-Drain I/Os

Port and Interrupt

INT

Timing Characteristics

PARAMETER

Port Output Data Valid

Port Input Setup Time

Port Input Hold Time

INT

Input Data Valid Time

INT

Reset Delay Time from STOP

INT

Reset Delay Time from

Acknowledge

SYMBOL

t

PPV

t

PSU

t

PH

t

IV

t

IP

t

IR

C

L

≤ 100pF

C

L

≤ 100pF

C

L

≤ 100pF

C

L

≤ 100pF

C

L

≤ 100pF

C

L

≤ 100pF

(V+ = +1.71V to +5.5V, T

A

= -40°C to +125°C, unless otherwise noted. Typical values are at V+ = +3.3V, T

A

= +25°C.) (Note 1)

CONDITIONS

MIN

0

4

TYP

MAX

4

UNITS

µs

Timing Characteristics

PARAMETER

Serial-Clock Frequency

Bus Free Time Between a STOP

and a START Condition

Hold Time (Repeated) START

Condition

Repeated START Condition

Setup Time

STOP Condition Setup Time

Data Hold Time

Data Setup Time

SCL Clock Low Period

SCL Clock High Period

Rise Time of Both SDA and SCL

Signals, Receiving

Fall Time of Both SDA and SCL

Signals, Receiving

Fall Time of SDA Transmitting

Pulse Width of Spike Suppressed

Capacitive Load for Each Bus

Line

RST

Pulse Width

RST

Rising to START Condition

Setup Time

(V+ = +1.71V to +5.5V, T

A

= -40°C to +125°C, unless otherwise noted. Typical values are at V+ = +3.3V, T

A

= +25°C.) (Note 1)

SYMBOL

f

SCL

t

BUF

t

HD, STA

t

SU, STA

t

SU, STO

t

HD, DAT

t

SU, DAT

t

LOW

t

HIGH

t

R

t

F

t

F,TX

t

SP

C

b

t

W

t

RST

(Notes 3, 4)

(Note 5)

(Note 3)

500

1

(Note 2)

100

1.3

0.7

20 +

0.1C

b

20 +

0.1C

b

20 +

0.1C

b

50

400

300

250

1.3

0.6

0.9

CONDITIONS

MIN

TYP

MAX

400

UNITS

kHz

µs

ns

µs

ns

pF

ns

µs

Note 1:

All parameters are tested at T

A

= +25°C. Specifications over temperature are guaranteed by design.

Note 2:

A master device must provide a hold time of at least 300ns for the SDA signal (referred to VIL of the SCL signal) in order to

bridge the undefined region of SCL’s falling edge.

Note 3:

Guaranteed by design.

Note 4:

C

b

= total capacitance of one bus line in pF. I

SINK

≤ 6mA. t

R and t

F

measured between 0.3 × V+ and 0.7 × V+.

Note 5:

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

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Maxim Integrated

│

3

MAX7325

I

2

C Port Expander with 8 Push-Pull

and 8 Open-Drain I/Os

Typical Operating Characteristics

(T

A

= +25°C, unless otherwise noted.)

STANDBY CURRENT

vs. TEMPERATURE

MAX7325 toc01

1.8

STANDBY CURRENT (µA)

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0

V+ = +1.71V

V+ = +2.5V

V+ = +3.3V

f

SCL

= 0kHz

f

SCL

= 400kHz

V+ = +5.0V

50

SUPPLY CURRENT (µA)

40

30

20

10

0

V+ = +5.0V

V+ = +3.3V

V+ = +2.5V

V+ = +1.71V

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

TEMPERATURE (

°

C)

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

TEMPERATURE (

°

C)

OUTPUT VOLTAGE LOW

vs. TEMPERATURE

MAX7325 toc03

OUTPUT VOLTAGE HIGH (V)

OUTPUT VOLTAGE LOW (V)

0.20

0.15

0.10

0.05

0

V+ = +3.3V

I

SINK

= 15mA

V+ = +5.0V

I

SINK

= 20mA

5

4

3

2

1

0

V+ = +3.3V

I

SOURCE

= 5mA

V+ = +5.0V

I

SOURCE

= 10mA

V+ = +2.5V I

SOURCE

= 5mA

V+ = +1.71V I

SOURCE

= 2mA

V+ = +2.5V

I

SINK

= 10mA

V+ = +1.71V

I

SINK

= 5mA

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

TEMPERATURE (°C)

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

TEMPERATURE (°C)

Pin Description

QSOP

1

2

3, 21

4–11

12

13–20

22

23

24

—

TQFN

22

23

24, 18

1–8

9

10–17

19

20

21

—

NAME

INT

RST

AD2, AD0

P0–P7

GND

O8–O15

SCL

SDA

V+

EP

FUNCTION

Interrupt Output, Active-Low.

INT

is an open-drain output.

Reset Input, Active-Low. Drive

RST

low to clear the 2-wire interface.

Address Inputs. Select device slave address with AD0 and AD2. Connect AD0 and AD2

to either GND, V+, SCL, or SDA to give four logic combinations (see Tables 2 and 3).

Open-Drain I/O Ports

Ground

Output Ports. O8–O15 are push-pull outputs.

I

2

C-Compatible Serial-Clock Input

I

2

C-Compatible Serial-Data I/O

Positive Supply Voltage. Bypass V+ to GND with a ceramic capacitor of at least 0.047µF.

Exposed Paddle (TQFN Only). Connect exposed pad to GND.

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│

4

MAX7325 toc04

0.25

6

OUTPUT VOLTAGE HIGH

vs. TEMPERATURE

MAX7325 toc02

2.0

60

SUPPLY CURRENT

vs. TEMPERATURE

MAX7325

I

2

C Port Expander with 8 Push-Pull

and 8 Open-Drain I/Os

The MAX7325 is set to two of 32 I

2

C slave addresses

(see

Table 2

and

Table 3)

using the address select inputs

AD0 and AD2, and is accessed over an I

2

C serial interface

up to 400kHz. The eight outputs and eight I/Os have

different slave addresses. The eight push-pull outputs

have the 101xxxx addresses and the eight inputs have

addresses with 110xxxx. The

RST

input clears the serial

interface in case of a bus lockup, terminating any serial

transaction to or from the MAX7325.

Configure any port as a logic input by setting the port

output logic-high (logic-high for an open-drain output is

high impedance). When the MAX7325 is read through

the serial interface, the actual logic levels at the ports are

read back.

Detailed Description

MAX7319–MAX7329 Family Comparison

The MAX7324–MAX7327 family consists of four pin-

compatible, 16-port expanders that integrate the functions

of the MAX7320 and one of either MAX7319, MAX7321,

MAX7322, or MAX7323.

Functional Overview

The MAX7325 is a general-purpose port expander operating

from a +1.71V to +5.5V supply with eight push-pull outputs

and eight open-drain I/O ports. Each open-drain output is

rated to sink 20mA, and the entire device is rated to sink

100mA into all ports combined. The outputs drive loads

connected to supplies up to +5.5V.

Table 1. MAX7319–MAX7329 Family Comparison

PART

I

2

C

INPUT

SLAVE

INPUTS INTERRUPT

ADDRESS

MASK

OPEN-

DRAIN

OUTPUTS

PUSH-

PULL

OUTPUTS

CONFIGURATION

16-PORT EXPANDERS

8 input and 8 push-pull output versions:

8 input ports with programmable latching transition

detection interrupt and selectable pullups.

MAX7324

8

Yes

—

8

8 push-pull outputs with selectable default logic

levels.

Offers maximum versatility for automatic input

monitoring. An interrupt mask selects which inputs

cause an interrupt on transitions, and transition flags

identify which inputs have changed (even if only

for a transient) since the ports were last read.

101xxxx

and

110xxxx

8 I/O and 8 push-pull output versions:

8 open-drain I/O ports with latching transition

detection interrupt and selectable pullups.

8 push-pull outputs with selectable default logic

levels.

MAX7325

Up to 8

—

Up to 8

8

Open-drain outputs can level shift the logic-high state

to a higher or lower voltage than V+ using external

pullup resistors, but pullups draw current when output

is low. Any open-drain port can be used as an input

by setting the open-drain output to logic-high.

Transition flags identify which open-drain port inputs

have changed (even if only for a transient) since the

ports were last read.

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5

MAX7325

MAX7325概述

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