MAXIM MAX7306, MAX7307 User Manual

General Description

The MAX7306/MAX7307 I2C-/SMBus™-compatible, seri­al-interfaced peripherals feature four level-translating
I/Os and operate from a 1.62V to 3.6V power supply.
The MAX7307 features a port supply (V

LA

) that allows
level translation on I/O ports to operate from a separate
power supply from 1.4V to 5.5V. The MAX7306 features
an address select input (AD0) to allow up to four unique
slave addresses.

The MAX7306/MAX7307 ports P2, P3, and P4 can be
configured as inputs, push-pull outputs, and open-drain
outputs. Port P1 can be configured as a general-pur­pose input, open-drain output, or an open-drain INT out-
put. Ports P2 and P3 can be configured as OSCIN and
OSCOUT, respectively. The MAX7306/MAX7307 include
an internal oscillator for PWM, blink, and key debounce,
or to cascade multiple MAX7306/MAX7307s. The exter­nal clock can be used to set a specific PWM and blink
timing. The RST input asynchronously clears the 2-wire
interface and terminates a bus lockup involving the
MAX7306/MAX7307.

All ports configured as output feature 33-step PWM,
allowing any output to be set from fully off, 1/32 to 31/32
duty cycle, to fully on. All output ports also feature LED
blink control, allowing blink periods of 1/8 second, 1/4
second, 1/2 second, 1, 2, 4, or 8 seconds. Any port can
blink during this period with a 1/16 to 15/16 duty cycle.

The MAX7306/MAX7307 are specified over the -40°C to
+125°C temperature range and are available in 10-pin
µDFN (2mm x 2mm) and 10-pin µMAX

®

packages.

Applications

Cell Phones LCD/Keypad Backlights
System I/O Ports LED Status Indicators

Features

♦ 1.4V to 5.5V I/O Level Translation Port Supply (VLA)
♦ 1.62V to 3.6V Power Supply
♦ Four Individually Configurable GPIO Ports

P1 = Open-Drain I/O
P2, P3, P4 = Push-Pull or Open-Drain I/O

♦ Individual 33-Step PWM Intensity Control
♦ Blink Controls with 15 Steps on Outputs
♦ 1kHz PWM Period Provides Flicker-Free LED

Intensity Control

♦ 25mA (max) Port Output Sink Current (100mA

max Ground Current)

♦ Inputs Overvoltage Protected Up to 5.5V (VLA)
♦ Transition Detection with Optional Interrupt Output
♦ Optional Input Debouncing
♦ RST Input Clears Serial Interface, Can Restore

Power-Up Default State, and Synchronizes Blink
Timing

♦ Oscillator Input and Output Enables Cascading

Multiple Devices

♦ Low 0.75µA (typ) Standby Current

MAX7306/MAX7307

SMBus/I2C Interfaced 4-Port, Level-Translating

GPIOs and LED Drivers

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-0836; Rev 1; 8/10

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.

Ordering Information continued at end of data sheet.

Pin Configurations appear at end of data sheet.

EVALUATION KIT

AVAILABLE

SMBus is a trademark of Intel Corp.
µMAX is a registered trademark of Maxim Integrated Products, Inc.

PART

PIN-PACKAGE

MAX7306ALB+ AAL

10 µDFN (2mm x 2mm)

Note: All devices are specified over the -40°C to +125°C oper­ating temperature range.

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

μC

SDA

GND

+1.8V

V

DD

V

LA

P2/OSCIN

P3/OSCOUT

P4

+4.5V

MAX7307

SCL

RST

INT

SDA

SCL

RST

P1/INT

AD0

μC

SDA

GND

+2.5V

V

DD

P2/OSCIN

P3/OSCOUT

P4

MAX7306

SCL

RST

INT

SDA

SCL

RST

P1/INT

Typical Operating Circuit

TOP MARK

MAX7306/MAX7307

SMBus/I2C Interfaced 4-Port, Level-Translating
GPIOs and LED Drivers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS (MAX7306)

(VDD= 1.62V to 3.6V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VDD= 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.

(All voltages referenced to GND.)
V

DD

..........................................................................-0.3V to +4V

V

LA

, SCL, SDA, AD0, and RST.................................-0.3V to +6V

P1/INT, P2/OSCIN, P3/OSCOUT, and P4

MAX7306................................................-0.3V to (V

DD

+ 0.3V)

MAX7307.................................................-0.3V to (V

LA

+ 0.3V)

P1/INT, P2/OSCIN, P3/OSCOUT, and P4 Sink Current ......25mA

P2/OSCIN, P3/OSCOUT, and P4 Source Current ..............10mA

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

V

DD

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

V

LA

Current (MAX7307) ......................................................30mA

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

Continuous Power Dissipation (T

A

= +70°C)

10-Pin µDFN (derate 5.0mW/°C over +70°C) ..............402mW

10-Pin µMAX (derate 10.3mW/°C over +70°C) ............825mW

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

PARAMETER

CONDITIONS MIN TYP

UNITS

Operating Supply Voltage V

DD

V

Power-On Reset Voltage V

POR

VDD rising 1.0 1.3 1.6 V

Power-On Reset Hysteresis

10 131 300

mV

I

STB

Internal oscillator disabled; SCL,
SDA, digital inputs at V

DD

or

GND; P1–P4 (as inputs) at V

DD

or

GND

0.75 2

Standby Current (Interface Idle)

I

OSC

Internal oscillator enabled; SCL,
SDA, digital inputs at V

DD

or

GND; P1–P4 (as inputs) at V

DD

or

14 25

µA

S up p l y C ur r ent ( Inter face Runni ng ) I

SUP

f

S C L

= 400kH z; other d i g i tal i np uts

at V

DD

or GND

33 40 µA

Input High Voltage SDA, SCL, AD0 V

IH

0.7 x V

DD

V

Input Low Voltage SDA, SCL, AD0 V

IL

V

Input High Voltage RST, P1–P4 V

IHP

0.7 x V

DD

V

Input Low Voltage RST, P1–P4 V

ILP

V

Inp ut Leakag e C ur r ent S D A, S C L, AD 0I

IH

, IILVDD or GND -1 +1 µA

Input Leakage Current RST, P1–P4

VDD or GND -1 +1 µA

Input Capacitance SDA, SCL, AD0, P1–P4 8 pF

VDD = 1.62V, I

SINK

= 3mA 0.06

VDD = 2.5V, I

SINK

= 16mA 0.19 0.4Output Low Voltage P1–P4 V

OL

VDD = 3.3V, I

SINK

= 20mA 0.2 0.4

V

VDD = 1.62V, I

SOURCE

= 0.5mA

1.6

VDD ≥ 2.5V, I

SOURCE

= 5mA

2.3Output High Voltage P2, P3, and P4 V

OH

VDD ≥ 3.3V, I

SOURCE

= 8mA

3.1

V

Output Low Voltage SDA

I

SINK

= 6mA 0.3 V

SYMBOL

V

PORHYST

MAX

1.62 3.60

GND

I

, I

IHP

ILP

V

OLSDA

1.55

V

- 0.3

D D

V

- 0.4

D D

0.3 x V

0.3 x V

DD

DD

0.11

MAX7306/MAX7307

SMBus/I2C Interfaced 4-Port, Level-Translating

GPIOs and LED Drivers

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (MAX7307)

(VDD= 1.62V to 3.6V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VDD= 3.3V, VLA= 3.3V, TA= +25°C.) (Note 1)

PARAMETER

CONDITIONS MIN TYP

UNITS

Operating Supply Voltage V

DD

V

Port Logic Supply Voltage V

LA

V

Power-On Reset Voltage V

POR

VDD rising 1.0 1.3 1.6 V

Power-On Reset Hysteresis

10 131 300 V

I

STB

Inter nal osci l l ator d i sab l ed ; S C L,
S D A, d i g i tal i np uts at V

D D

or G N D ;

P 1–P 4 ( as i np uts) at V

L A

or G N D

0.75 2

Standby Current (Interface Idle)

I

OSC

Inter nal osci l l ator enab l ed ; S C L,
S D A, d i g i tal i np uts at V

D D

or G N D ;

P 1–P 4 ( as i np uts) at V

L A

or G N D

14 25

µA

S up p l y C ur r ent ( Inter face Runni ng ) I

SUP

f

SCL

= 400kHz; other digital

inputs at V

LA

or GND

33 40 µA

Port Supply Current (VLA)I

VLA

Port (configured as inputs) at V

LA

or GND

0.05 5 µA

Input High Voltage SDA, SCL, RST V

IH

0.7 x V

DD

V

Input Low Voltage SDA, SCL, RST V

IL

V

Input is VLA referred 0.7 x V

LA

Input High Voltage P1–P4 V

IHPA

Input is VDD referred 0.7 x V

DD

V

Input is VLA referred

Input Low Voltage P1–P4 V

ILPA

Input is VDD referred

V

Inp ut Leakag e C ur r ent S D A, S C L, AD 0, RST

IIH, I

ILVDD

or GND -1 +1 µA

Input Leakage Current P1–P4

VLA or GND -1 +1 µA

Input Capacitance SDA, SCL, AD0, RST,
P1–P4

8

pF

VDD = 1.62V, I

SINK

= 3mA 0.06

VDD = 2.5V, I

SINK

= 16mA 0.19 0.4Output Low Voltage P1–P4 V

OL

VDD = 3.3V, I

SINK

= 20mA 0.2 0.4

V

VLA = 1.62V, I

SOURCE

= 0.5mA 1.3 1.4

VLA = 2.5V, I

SOURCE

= 5mA

2.3

Output High Voltage P2, P3, P4 V

OH

VLA = 3.3V, I

SOURCE

= 8mA

3.1

V

Output Low Voltage SDA

I

SINK

= 6mA 0.3 V

SYMBOL

V

PORHYST

I

, I

IHP

ILP

V

OLSDA

V LA - 0.3

V LA - 0.4

MAX

1.62 3.60

1.40 5.50

0.3 x V

0.3 x V

0.3 x V

0.11

0.11

DD

LA

DD

MAX7306/MAX7307

SMBus/I2C Interfaced 4-Port, Level-Translating
GPIOs and LED Drivers

4 _______________________________________________________________________________________

PORT, INTERRUPT (INT), AND RESET (RST) TIMING CHARACTERISTICS

(VDD= 1.62V to 3.6V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VDD= 3.3V, VLA= 3.3V (MAX7307 only), TA=

+25°C.) (Note 1) (See Figures 14, 15, and 16)

PARAMETER

CONDITIONS

TYP

UNITS

f

CLK

= internal oscillator 32 kHz

Oscillator Frequency f

CLK

f

CLK

= external input 1 MHz

Port Output Data Valid High Time t

PPVH

CL ≤ 100pF 4 µs

Port Output Data Valid Low Time (Internal or
External Oscillator Running)

CL ≤ 100pF (Note 2)

µs

Port Output Data Valid Low Time (Oscillator Not
Running)

CL ≤ 100pF 40 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

RST Pulse Width t

W

ns

RST Rising to START Condition Setup Time t

RST

ns

TIMING CHARACTERISTICS

(VDD= 1.62V to 3.6V, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at VDD= 3.3V, VLA= 3.3V (MAX7307 only), TA=

+25°C.) (Note 1) (See Figure 8)

PARAMETER

CONDITIONS

TYP

UNITS

Serial-Clock Frequency f

SCL

kHz

Bus Timeout

31 ms

t

BUF

µs

Hold Time, (Repeated) START Condition

µs

Repeated START Condition Setup Time

µs

STOP Condition Setup Time

µs

Data Hold Time

(Note 3)

µs

Data Setup Time

ns

SCL Clock Low Period t

LOW

µs

SCL Clock High Period t

HIGH

µs

t

R

(Notes 2, 4)

ns

t

F

(Notes 2, 4)

ns

Fall Time of SDA Transmitting t

F.TX

(Note 4)

ns

Pulse Width of Spike Suppressed t

SP

(Note 5) 50 ns

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

b

(Note 2)

pF

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.

Note 4: C

b

= total capacitance of one bus line in pF. tRand tFare measured between 0.3 x VDDand 0.7 x VDD.

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

SYMBOL

MIN

MAX

Bus Fr ee Tim e Betw een a S TOP and a S TART C ond i ti on

Rise Time of Both SDA and SCL Signals, Receiving

Fall Time of Both SDA and SCL Signals, Receiving

t

PPVL1

t

PPVL2

500

900

SYMBOL

t

TIMEOUT

t

HD,STA

t

SU,STA

t

SU,STO

t

HD,DAT

t

SU,DAT

MIN

1.3

0.6

0.6

0.6

100

1.3

0.7

20 + 0.1C b 300

20 + 0.1C b 300

20 + 0.1C b 250

1 / f

CLK

MAX

400

0.9

400

Typical Operating Characteristics

(VDD= 3.3V, VLA= 3.3V, and TA= +25°C, unless otherwise noted.) (MAX7307)

QUIESCENT SUPPLY CURRENT

vs. TEMPERATURE

TEMPERATURE (°C)

QUIESCENT SUPPLY CURRENT (μA)

MAX7306/7 toc01

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

0.40

0.45

0.50

0.55

0.60

0.65

0.70
INTERNAL OSCILLATOR OFF

QUIESCENT SUPPLY CURRENT

vs. TEMPERATURE

TEMPERATURE (°C)

QUIESCENT SUPPLY CURRENT (μA)

MAX7306/7 toc02

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

11.0

11.5

12.0

12.5

13.0

13.5

14.0
INTERNAL OSCILLATOR ON

ACTIVE SUPPLY CURRENT

vs. TEMPERATURE

TEMPERATURE (°C)

QUIESCENT SUPPLY CURRENT (μA)

MAX7306/7 toc03

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

33.0

33.5

34.0

34.5

35.0

35.5

36.0
f

SCL

= 400kHz

PORT OPEN-DRAIN OUTPUT LOW VOLTAGE

vs. SINK CURRENT

SINK CURRENT (mA)

OUTPUT-VOLTAGE LOW (V)

MAX7306/7 toc04

0 5 10 15 20 25

0

0.05

0.10

0.15

0.20

0.25

0.30

0.35

+125°C

+25°C

-40°C

PUSH-PULL OUTPUT HIGH VOLTAGE

vs. SOURCE CURRENT

SOURCE CURRENT (mA)

OUTPUT-VOLTAGE HIGH (V)

MAX7306/7 toc05

03691215

2.7

2.8

2.9

3.0

3.1

3.2

3.3

-40°C

+25°C

+125°C

INTERNAL OSCILLATOR

vs. TEMPERATURE

TEMPERATURE (°C)

FREQUENCY (kHz)

MAX7306/7 toc06

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

31.0

31.5

32.0

32.5

33.0

33.5

34.0

MAX7306/MAX7307

SMBus/I2C Interfaced 4-Port, Level-Translating

GPIOs and LED Drivers

_______________________________________________________________________________________ 5

2.00V/div

STAGGERED PWM OUTPUT

400μs/div

MAX7306/7 toc07

PUSH-PULL OUTPUT RISE TIME

P1

P2

P3

P4

2V/div

20ns/div

MAX7306/7 toc08

CL = 10pF

= 100pF

C

L

MAX7306/MAX7307

SMBus/I2C Interfaced 4-Port, Level-Translating
GPIOs and LED Drivers

6 _______________________________________________________________________________________

Pin Description

PIN

MAX7306 MAX7307

11RST

2 2 P1/INT

3 3 GND Ground

4 4 P2/OSCIN

5 5 P3/OSCOUT

6 6 P4 Input/Output Port. P4 is configurable as a push-pull I/O or an open-drain I/O.

—7 V

7 — AD0

88VDDPositive Supply Voltage. Bypass VDD to GND with a 0.1µF ceramic capacitor.

9 9 SDA Serial-Data I/O

10 10 SCL Serial-Clock Input

— — EP Exposed Pad (µMAX only). Connect to GND.

NAME FUNCTION

Reset Input. RST is an active-low input, referenced to V
which can be configured to put the device in the power-up reset condition and reset the
PWM and blink timing.

Input/Output Port. P1/INT is configurable as an open-drain I/O or as a transition detection
interrupt output.

Input/Output Port. P2/OSCIN is configurable as a push-pull I/O, open-drain I/O, or as the
PWM/blink/timing oscillator input.

Input/Output Port. P3/OSCOUT is configurable as a push-pull I/O, open-drain I/O, or as
the PWM/blink/timing oscillator output.

LA

Port Supply for P1–P4. Connect VLA to a power supply between 1.40V and 5.5V. Bypass

to GND with a 0.1µF capacitor.

V

LA

Address Input. Sets the device slave address. Connect to GND, V
provide four address combinations.

, that clears the 2-wire interface,

DD

, SCL, or SDA to

DD

MAX7306/MAX7307

SMBus/I2C Interfaced 4-Port, Level-Translating

GPIOs and LED Drivers

_______________________________________________________________________________________ 7

Detailed Description

The MAX7306/MAX7307 4-port, general-purpose port
expanders operate from a 1.62V to 3.6V power supply.
Ports P2 through P4 can be configured as inputs, push­pull outputs, and open-drain outputs. Port P1 can be
configured as an input and an open-drain output; P1
can also be configured to function as an (INT) output.

Each port configured as an open-drain or push-pull
output can sink up to 25mA. Push-pull outputs also
have a 10mA source drive capability. The MAX7306/
MAX7307 are rated to sink a total of 100mA into any
combination of the output ports. Output ports have
PWM and blink capabilities, as well as logic drive.

Initial Power-Up

On power-up, the MAX7307 default configuration has
all ports configured as input ports with logic levels ref­erenced to VLA. The MAX7306 default configuration
has all ports configured as input ports with logic levels
referenced to V

DD

. The transition detection interrupt

status flag resets and stays high (see Tables 1 and 2).

Device Configuration Registers

The device configuration registers set up the interrupt
function, serial-interface bus timeout, PWM/blink, oscil­lator options, global blink period, and reset options
(see Tables 3 and 4).

Block Diagram

SCL

SDA

AD0

MAX7306 ONLY

RST

MAX7306/

MAX7307

I2C

REGISTER

BANK

V

DD

OUTPUT

LOGIC

I/O

CONTROL

V

LA

I/O

INPUT
LOGIC

MAX7307 ONLY

P1–P4