19-0836; Rev 1; 8/10
2
SMBus/I C Interfaced 4-Port, Level-Translating
GPIOs and LED Drivers
General Description
Features
The MAX7306/MAX7307 I2C-/SMBus™-compatible, seri-
al-interfaced peripherals feature four level-translating
I/Os and operate from a 1.62V to 3.6V power supply.
LA
♦ 1.4V to 5.5V I/O Level Translation Port Supply (V
♦ 1.62V to 3.6V Power Supply
)
♦ Four Individually Configurable GPIO Ports
P1 = Open-Drain I/O
The MAX7307 features a port supply (V ) that allows
LA
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.
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
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-pur-
pose 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 exter-
nal 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.
Intensity Control
♦ 25mA (max) Port Output Sink Current (100mA
max Ground Current)
♦ Inputs Overvoltage Protected Up to 5.5V (V
)
LA
♦ 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
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.
♦ Low 0.75µA (typ) Standby Current
Ordering Information
PART
TOP MARK PIN-PACKAGE
AAL 10 µDFN (2mm x 2mm)
MAX7306ALB+
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.
Note: All devices are specified over the -40°C to +125°C oper-
ating temperature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
Applications
LCD/Keypad Backlights
LED Status Indicators
Ordering Information continued at end of data sheet.
Pin Configurations appear at end of data sheet.
Cell Phones
System I/O Ports
SMBus is a trademark of Intel Corp.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Typical Operating Circuit
+1.8V
+4.5V
+2.5V
V
DD
V
LA
V
DD
μC
μC
SDA
SCL
RST
INT
SDA
SDA
SCL
RST
INT
SDA
MAX7307
MAX7306
SCL
RST
SCL
RST
P2/OSCIN
P2/OSCIN
P3/OSCOUT
P4
P1/INT
P3/OSCOUT
P4
P1/INT
AD0
GND
GND
________________________________________________________________ Maxim Integrated Products
1
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.