Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsInterface ICsInterface IC - I/O extensions I²C 400 kHz SSOP 28

Pin Configurations continued at end of data sheet.

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General Description

The MAX7300 compact, serial-interfaced, I/O expansion

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

C-compatible 2-wire

serial interface, and uses four-level logic to allow 16 I

addresses from only two select pins.

The MAX7300AAX and MAX7300ATL have 28 ports and

are available in 36-pin SSOP and 40-pin TQFN packages,

respectively. The MAX7300AAI and MAX7300ATI have 20

ports and are available in 28-pin SSOP and TQFN pack-

ages. For an SPI-interfaced version, refer to the MAX7301

data sheet. For a pin-compatible port expander with addi-

tional 24mA constant-current LED drive capability, refer to

the MAX6956 data sheet.

Features

● 400kbps I2C-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

*EP = Exposed pad.

Devices are also available in a lead(Pb)-free/RoHS-compliant

package. Specify lead-free by adding “+” to the part number

when ordering. Devices are also available in tape-and-reel

packaging. Specify tape and reel by adding “T” to the part

number when ordering.

PART TEMP RANGE PIN-PACKAGE

MAX7300AAI -40°C to +125°C 28 SSOP

MAX7300ATI -40°C to +125°C 28 TQFN-EP*

MAX7300AAX -40°C to +125°C 36 SSOP

MAX7300ATL -40°C to +125°C 40 TQFN-EP*

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

ISET

28 SSOP

TOP VIEW

MAX7300

MAX7300 2-Wire-Interfaced, 2.5V to 5.5V,

20-Port or 28-Port I/O Expander

19-2413; Rev 8; 5/14

P10

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

V+

GND

AD0

AD1

SCL

P30

P29

P31

P27

P28

P25

P24

P26

SDA

MAX7300AAX

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

ISET

Typical Operating Circuit

Ordering Information

Pin Congurations

Application

Summary of content (20 pages)

PAGE 1
MAX7300 2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port I/O Expander General Description The MAX7300 compact, serial-interfaced, I/O expansion 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.
PAGE 2
MAX7300 2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port I/O Expander Absolute Maximum Ratings Voltage (with respect to GND) V+.............................................................................-0.3V to +6V SCL, SDA, AD0, AD1...............................................-0.3V to +6V All Other Pins...............................................-0.3V to (V+ + 0.3V) P4–P31 Current ...............................................................±30mA GND Current..................................
PAGE 3
MAX7300 2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port I/O Expander Electrical Characteristics (continued) (Typical Operating Circuit, VV+ = 2.5V to 5.5V, TA = TMIN to TMAX, unless otherwise noted.) (Note 1) PARAMETER Output High Voltage Port Sink Current Output Short-Circuit Current SYMBOL VOH IOL IOLSC Input High-Voltage SDA, SCL, AD0, AD1 VIH Input Low-Voltage SDA, SCL, AD0, AD1 VIL Input Leakage Current SDA, SCL VOL MIN GPIO outputs, ISOURCE = 2mA, TA = -40°C to +85°C V+ 0.
PAGE 4
MAX7300 2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port I/O Expander Timing Characteristics (Figure 2) (continued) (VV+ = 2.5V to 5.5V, TA = TMIN to TMAX, unless otherwise noted.) (Note 1) Note 1: All parameters tested at TA = +25°C. Specifications over temperature are guaranteed by design. Note 2: Guaranteed by design.
PAGE 5
MAX7300 2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port I/O Expander Typical Operating Characteristics (continued) (RISET = 39kΩ, TA = +25°C, unless otherwise noted.) 12 10 8 6 4 -40.0 PULLUP CURRENT (A) 15.0 42.5 70.0 97.5 4 3 -40.0 -12.5 15.0 42.5 70.0 97.5 GPI PULLUP CURRENT vs. TEMPERATURE GPO SHORT-CIRCUIT CURRENT vs. TEMPERATURE 100 VV+ = 3.3V -12.5 15.0 42.5 70.0 TEMPERATURE (°C) 125.0 GPO = 0, PORT SHORTED TO V+ 10 VV+ = 2.5V www.maximintegrated.com VV+ = 2.
PAGE 6
MAX7300 2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port I/O Expander Pin Description PIN NAME 28 SSOP 28 TQFN-EP 36 SSOP 40 TQFN-EP 1 26 1 36 ISET 2, 3 27, 28 2, 3 37, 38, 39 GND 4 1 4 5–24 2–21 — — — 5–32 — — — 25 22 26 FUNCTION Bias Current Setting. Connect ISET to GND through a resistor (RISET) value of 39kW to 120kW. Ground Address Input 0. Sets device slave address. Connect to either GND, V+, SCL, SDA to give four logic combinations. See Table 3. I/O Ports.
PAGE 7
MAX7300 2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port I/O Expander Table 1.
PAGE 8
MAX7300 2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port I/O Expander PORT REGISTERS CONFIGURATION MASK REGISTER GPIO P4 TO P31 CONFIGURATION REGISTERS PORT CHANGE DETECTOR DATA R/W CE 8 GPIO DATA R/W 8 AD0 COMMAND REGISTER DECODE ADDRESS MATCHER AD1 7 8 8 DATA BYTE D0 D1 D2 D3 D4 COMMAND BYTE D5 D6 7 7-BIT DEVICE ADDRESS SDA SCL D7 D8 D9 D10 TO/FROM DATA REGISTERS D11 D12 D13 D14 D15 TO COMMAND REGISTERS R/W SLAVE ADDRESS BYTE DATA BYTE COMMAND BYTE Figure 1.
PAGE 9
MAX7300 2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port I/O Expander SDA tSU, STA tSU, DAT tLOW tHD, DAT SCL tBUF tHD, STA tSU, STO tHIGH tHD, STA tR tF REPEATED START CONDITION START CONDITION STOP CONDITION START CONDITION Figure 2. 2-Wire Serial Interface Timing Details SDA S P START CONDITION STOP CONDITION SCL Figure 3. Start and Stop Conditions SDA SCL DATA LINE STABLE; DATA VALID CHANGE OF DATA ALLOWED Figure 4.
PAGE 10
MAX7300 2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port I/O Expander CLOCK PULSE FOR ACKNOWLEDGMENT START CONDITION SCL 1 2 8 9 SDA BY TRANSMITTER S SDA BY RECEIVER Figure 5. Acknowledge SDA 1 0 0 A3 MSB A2 A1 A0 R/W ACK LSB SCL Figure 6.
PAGE 11
MAX7300 2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port I/O Expander D15 D14 D13 D12 D11 D10 D9 COMMAND BYTE IS STORED ON RECEIPT OF STOP CONDITION ACKNOWLEDGE FROM MAX7300 S SLAVE ADDRESS 0 R/W A D8 A COMMAND BYTE P ACKNOWLEDGE FROM MAX7300 Figure 7.
PAGE 12
MAX7300 2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port I/O Expander ACKNOWLEDGE FROM MAX7300 ACKNOWLEDGE FROM MAX7300 HOW COMMAND BYTE AND DATA BYTE MAP INTO MAX7300’s REGISTER D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 ACKNOWLEDGE FROM MAX7300 S SLAVE ADDRESS 0 COMMAND BYTE A DATA BYTE A A P ‘n’ BYTES R/W AUTOINCREMENT MEMORY WORD ADDRESS Figure 9. ‘n’ Data Bytes Received Table 3.
PAGE 13
MAX7300 2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port I/O Expander Table 5.
PAGE 14
MAX7300 2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port I/O Expander Table 5. Register Address Map (continued) COMMAND ADDRESS D15 D14 D13 D12 D11 D10 D9 D8 HEX CODE Port 26 only (data bit D0. D7-D1 read as 0) X 0 1 1 1 0 1 0 0x3A Port 27 only (data bit D0. D7-D1 read as 0) X 0 1 1 1 0 1 1 0x3B Port 28 only (data bit D0. D7-D1 read as 0) X 0 1 1 1 1 0 0 0x3C Port 29 only (data bit D0. D7-D1 read as 0) X 0 1 1 1 1 0 1 0x3D Port 30 only (data bit D0.
PAGE 15
MAX7300 2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port I/O Expander Table 6.
PAGE 16
MAX7300 2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port I/O Expander Table 7. Configuration Register Format REGISTER DATA FUNCTION ADDRESS CODE (HEX) D7 D6 D5 D4 D3 D2 D1 D0 Configuration Register 0x04 M 0 X X X X X S Table 8. Shutdown Control (S Data Bit D0) Format REGISTER DATA FUNCTION ADDRESS CODE (HEX) D7 D6 D5 D4 D3 D2 D1 D0 Shutdown 0x04 M 0 X X X X X 0 Normal Operation 0x04 M 0 X X X X X 1 Table 9.
PAGE 17
MAX7300 2-Wire-Interfaced, 2.5V to 5.
PAGE 18
MAX7300 2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port I/O Expander Pin Configurations (continued) 36 SSOP P27 P26 22 21 23 24 25 26 27 28 P4 P31 P5 P30 P6 P29 P7 P28 9 10 P17 8 7 P11 P15 P16 P25 15 SDA 22 14 SCL 23 13 P23 AD1 24 12 P22 V+ 25 11 P21 MAX7300 P24 ISET 26 10 P20 GND 27 9 P19 GND 28 8 P18 7 19 P22 P17 20 P23 P21 18 P26 21 P24 P20 17 16 P19 16 N.C.
PAGE 19
MAX7300 Chip Information PROCESS: CMOS www.maximintegrated.com 2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port I/O Expander Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO.
PAGE 20
MAX7300 2-Wire-Interfaced, 2.5V to 5.5V, 20-Port or 28-Port I/O Expander Revision History REVISION NUMBER REVISION DATE DESCRIPTION PAGES CHANGED 7 9/11 Updated Ordering Information, Absolute Maximum Ratings, Pin Description, Table 1, and Package Information sections 1, 2, 6, 7, 19 8 5/14 No /V OPNs; removed automotive reference from Applications section 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.