MAX7301_15 Datasheet, PDF (1/17 Pages) Maxim Integrated Products – 4-Wire-Interfaced, 2.5V to 5.5V,20-Port and 28-Port I/O Expander

MAX7301
4-Wire-Interfaced, 2.5V to 5.5V,
20-Port and 28-Port I/O Expander
General Description
The MAX7301 compact, serial-interfaced I/O expander
(or general-purpose I/O (GPIO) peripheral) provides
microprocessors with up to 28 ports. Each port is individu-
ally user configurable to either a logic input or logic output.
Each port can be configured either as 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 MAX7301 is controlled through an SPI-compatible
4-wire serial interface.
The MAX7301AAX and MAX7301ATL have 28 ports and
are available in 36-pin SSOP and 40-pin TQFN packages,
respectively. The MAX7301AAI has 20 ports and is avail-
able in a 28-pin SSOP package.
For a 2-wire I²C-interfaced version, refer to the MAX7300
data sheet.
For a pin-compatible port expander with additional
24mA constant-current LED drive capability, refer to the
MAX6957 data sheet.
Applications
●● White Goods
●● Gaming Machines
●● Industrial Controllers
●● System Monitoring
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
MAX7301AAI+
-40°C to +125°C 28 SSOP
MAX7301AAX+
-40°C to +125°C 36 SSOP
MAX7301ATL+
-40°C to +125°C 40 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
QSPI is a trademark of Motorola, Inc.
MICROWIRE is a registered trademark of National
Semiconductor Corp.
Benefits and Features
●● Industry-Standard 4-Wire Interface Simplifies
Expansion of I/O Ports to Up to 28 I/Os Independent
of Microprocessor Architecture
• High-Speed, 26MHz, SPI-/QSPI™-/MICROWIRE^®-
Compatible Serial Interface
• 2.25V to 5.5V Operation
• 20 or 28 I/O Ports Configurable as Push-Pull Logic
Output, Schmitt Logic Input or Schmitt Logic Input
with Internal Pullup
• Logic Transition Detection for Seven I/O Ports
●● Low Power Consumption Reduces Power-Supply
Requirements
• 11μA (max) Shutdown Current
Typical Operating Circuit
3V
47nF
CHIP SELECT
CLOCK IN
DATA IN
DATA OUT
36 _V+
3 _GND
2 _GND
39kΩ _{1 ISET}
35 _CS
33 _SCLK
34 _DIN
4 _DOUT
MAX7301
31 _P31
29 _P30
27 _P29
25 _P28
24 _P27
23 _P26
22 _P25
21 _P24
SSOP
P4 ³²
P5 ³⁰
P6 ²⁸
P7 ²⁶
P8 ⁵
P9 ⁷
P10 ⁹
P11 ¹¹
P12 ⁶
P13 ⁸
P14 ¹⁰
P15 ¹²
P16 ¹³
P17 ¹⁴
P18 ¹⁵
P19 ¹⁶
P20 ¹⁷
P21 ¹⁸
P22 ¹⁹
P23 ²⁰
I/O 4
I/O 5
I/O 6
I/O 7
I/O 8
I/O 9
I/O 10
I/O 11
I/O 12
I/O 13
I/O 14
I/O 15
I/O 16
I/O 17
I/O 18
I/O 19
I/O 20
I/O 21
I/O 22
I/O 23
I/O 24
I/O 25
I/O 26
I/O 27
I/O 28
I/O 29
I/O 30
I/O 31
Pin Configurations appear at end of data sheet.
19-2438; Rev 8; 4/15