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General Description
The MAX7300 compact, serial-interfaced, I/O expan-
sion peripheral provides microprocessors with up to 28
ports. Each port is individually user configurable to
either a logic input or logic output.
Each port can be configured as either a push-pull logic
output capable of sinking 10mA and sourcing 4.5mA, or a
Schmitt logic input with optional internal pullup. Seven
ports feature configurable transition detection logic, which
generates an interrupt upon change of port logic level.
The MAX7300 is controlled through an I
2
C*-compatible 2-
wire serial interface, and uses four-level logic to allow 16
I
2
C addresses from only two select pins.
The MAX7300AAX and MAX7300ATL have 28 ports and
are available in 36-pin SSOP and 40-pin thin QFN pack-
ages, respectively. The MAX7300AAI and MAX7300ATI
have 20 ports and are available in 28-pin SSOP and thin
QFN packages. For an SPI-interfaced version, refer to
the MAX7301 data sheet. For a pin-compatible port
expander with additional 24mA constant-current LED
drive capability, refer to the MAX6956 data sheet.
Applications
White Goods Industrial Controllers
Automotive System Monitoring
Features
♦ 400kbps I
2
C-Compatible Serial Interface
♦ 2.5V to 5.5V Operation
♦ -40°C to +125°C Temperature Range
♦ 20 or 28 I/O Ports, Each Configurable as
Push-Pull Logic Output
Schmitt Logic Input
Schmitt Logic Input with Internal Pullup
♦ 11µA (max) Shutdown Current
♦ Logic Transition Detection for Seven I/O Ports
MAX7300
2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or
28-Port I/O Expander
________________________________________________________________ Maxim Integrated Products 1
19-2413; Rev 6; 8/06
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.
Ordering Information
PART TEMP RANGE
PIN-
PACKAGE
PKG
CODE
MAX7300AAI -40°C to +125°C 28 SSOP A28-1
MAX7300ATI** -40°C to +125°C 28 Thin QFN T2855-6
MAX7300AAX -40°C to +125°C 36 SSOP A36-4
MAX7300ATL** -40°C to +125°C 40 Thin QFN T4066-5
*Purchase of I
2
C components from Maxim Integrated Products,
Inc., or one of its sublicensed Associated Companies, conveys
a license under the Philips I
2
C Patent Rights to use these com-
ponents in an I
2
C system, provided that the system conforms to
the I
2
C Standard Specification as defined by Philips.
P5
P4
P7
P8
P6
P10
P9
P12
P13
P11
P15
P14
P17
P18
P16
P20
P19
I/O 5
I/O 4
I/O 7
I/O 8
I/O 6
I/O 10
I/O 9
I/O 12
I/O 13
I/O 11
I/O 15
I/O 14
I/O 17
I/O 18
I/O 16
I/O 20
I/O 19
I/O 21
I/O 22
I/O 23
P22
P23
P21
36
2
3
4
33
35
34
29
27
31
24
25
22
21
23
V+
GND
GND
AD0
AD1
SCL
P30
P29
P31
P27
P28
P25
P24
P26
32
30
26
5
7
9
28
6
8
11
10
12
14
15
13
17
16
19
20
18
SDA
MAX7300AAX
3V
DATA
CLOCK
I/O 24
I/O 25
I/O 27
I/O 26
I/O 29
I/O 30
I/O 28
I/O 31
47nF
39kΩ
1
ISET
Typical Operating Circuit
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
V+
AD1
SCL
SDA
P31
P30
P22
P29
P28
P27
P26
P25
P24
P23
P21
P20
P19
P18
P17
P16
P15
P14
P13
P12
AD0
GND
GND
ISET
28 SSOP
TOP VIEW
MAX7300
Pin Configurations
Pin Configurations continued at end of data sheet.
**Use package outline 21-0140 for MAX7300ATI, 21-0141 for
MAX7300ATL at the end of the data sheet.
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