Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsInterface ICsInterface IC - I/O extensions POR I²C, SMBus 400 kHz SSOP 24

1

2

3

4

5

6

7

8

9

General Description

The MAX7312 2-wire-interfaced expander provides 16-bit

parallel input/output (I/O) port expansion in SMBus™ and

I

2

C applications. The MAX7312 consists of input port

registers, output port registers, polarity inversion regis-

ters, configuration registers, a bus timeout register, and

an I

2

C-compatible serial interface logic, compatible with

SMBus. The system master can invert the MAX7312 input

data by writing to the active-high polarity inversion regis-

ter. The system master can enable or disable bus timeout

by writing to the bus timeout register.

Any of the 16 I/O ports can be configured as an input or

an output. A power-on reset (POR) initializes the 16 I/Os

as inputs. Three address select pins configure the part

to one of 64 slave ID addresses.

The MAX7312 supports hot insertion. All port pins, the

INT output, SDA, SCL, and the slave address inputs

AD0-2 remain high impedance in power-down (V

t

= 0V)

up to 6V.

The MAX7312 is available in 24-pin SO, SSOP, TSSOP,

and thin QFN packages and is specified over the -40°C

to +125°C automotive temperature range.

For applications requiring I/Os with integrated 100kΩ

pullup resistors, refer to the MAX7311 data sheet.

Applications

Servers/Blades

RAID Systems

Medical Equipment

Instrumentation and Test Measurement

Networking

Features

♦ 400kbps I

2

C-Compatible Serial Interface

♦ 2V to 5.5V Operation

♦ 5V Overvoltage Tolerant I/Os

♦ Supports Hot Insertion

♦ 16 I/O Pins that Default to Inputs on Power-Up

♦ Open-Drain Interrupt Output (INT)

♦ Bus Timeout for Lock-Up-Free Operation

♦ Noise Filter on SCL/SDA Inputs

♦ 64 User-Selectable Slave ID Addresses

♦ Low Standby Current (2.9µA typ)

♦ Polarity Inversion

♦ 4mm

✕ 4mm, 0.8mm Thin QFN Package

♦ -40°C to +125°C Operation

MAX7312

2-Wire-Interfaced 16-Bit I/O Port Expander

with Interrupt and Hot-Insertion Protection

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-3057; Rev 3; 4/05

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.

SMBus is a trademark of Intel Corp.

I,

Ia

l-

ne

I.

EVALUATION KIT

AVAILABLE

PART TEMP RANGE PIN-PACKAGE

PKG

CODE

MAX7312AWG -40°C to +125°C 24 Wide SO —

MAX7312AAG -40°C to +125°C 24 SSOP —

MAX7312ATG -40°C to +125°C

24 Thin QFN

(4mm x 4mm)

T2444-4

MAX7312AUG -40°C to +125°C 24 TSSOP —

TOP VIEW

24

23

22

21

20

19

18

17

1

2

3

4

5

6

7

8

V

+

SDA

SCL

AD0I/O0

AD2

AD1

I/O15

I/O14

I/O13

I/O12I/O4

I/O3

I/O2

I/O1

16

15

14

13

9

10

11

12

I/O11

I/O10

I/O9

I/O8GND

I/O7

I/O6

I/O5

TSSOP/SSOP/SO

MAX7312

INT

THIN QFN

MAX7312ATG

19

20

21

22

12 3456

18 17 16 15 14 13

23

24

12

11

10

9

8

7

SCL

V+

SDA

INT

AD2

I/O0

I/O1

I/O2

I/O3

I/O4

I/O5

AD0

I/O15

I/O13

I/O12

I/O11

AD1

I/O10

I/O8

I/O9

GND

I/O6

I/O7

I/O14

Pin Configurations

Summary of content (16 pages)

PAGE 1
KIT ATION EVALU E L B AVAILA 19-3057; Rev 3; 4/05 2-Wire-Interfaced 16-Bit I/O Port Expander with Interrupt and Hot-Insertion Protection The MAX7312 2-wire-interfaced expander provides 16-bit parallel input/output (I/O) port expansion in SMBus™ and I2C applications. The MAX7312 consists of input port registers, output port registers, polarity inversion registers, configuration registers, a bus timeout register, and an I2C-compatible serial interface logic, compatible with SMBus.
PAGE 2
MAX7312 2-Wire-Interfaced 16-Bit I/O Port Expander with Interrupt and Hot-Insertion Protection ABSOLUTE MAXIMUM RATINGS V+ to GND ................................................................-0.3V to +6V I/O0–I/O15 as Inputs ....................................(GND - 0.3V) to +6V SCL, SDA, AD0, AD1, AD2, INT...................(GND - 0.3V) to +6V Maximum V+ Current ......................................................+250mA Maximum GND Current ...................................................
PAGE 3
2-Wire-Interfaced 16-Bit I/O Port Expander with Interrupt and Hot-Insertion Protection (V+ = 2V to 5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at V+ = 3.3V, TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS Leakage Current MIN TYP -1 Input Capacitance MAX +1 4 UNITS µA pF INT Low-Level Output Current IOL VOL = 0.4V 6 mA AC ELECTRICAL CHARACTERISTICS (V+ = 2V to 5.5V, TA = -40°C to +125°C, unless otherwise noted.
PAGE 4
Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) 60 V+ = 3.3V 50 40 30 V = 2V 6 5 V+ = 3.3V 4 3 0 0 25 50 75 100 125 10 -25 0 25 50 75 100 2.0 125 2.5 3.0 3.5 4.0 4.5 5.0 I/O SINK CURRENT vs. OUTPUT LOW VOLTAGE I/O SINK CURRENT vs. OUTPUT LOW VOLTAGE 40 TA = -40°C 35 30 30 TA = +25°C 20 TA = +125°C 15 0.2 0.3 0.4 0.5 25 20 10 10 5 5 0.6 TA = +25°C TA = +125°C 15 0 0.
PAGE 5
2-Wire-Interfaced 16-Bit I/O Port Expander with Interrupt and Hot-Insertion Protection I/O SOURCE CURRENT vs. OUTPUT HIGH VOLTAGE I/O HIGH VOLTAGE vs. TEMPERATURE TA = -40°C 40 MAX7312 toc11 V+ = 5V 45 500 MAX7312 toc10 50 400 V+ = 2V, ISOURCE = 10mA V+ - VOH (V) ISOURCE (mA) 35 TA = +25°C 30 25 20 300 200 TA = +125°C 15 10 100 5 V+ = 5V, ISOURCE = 10mA 0 0 0 0.1 0.2 0.3 0.4 0.5 0.
PAGE 6
MAX7312 2-Wire-Interfaced 16-Bit I/O Port Expander with Interrupt and Hot-Insertion Protection AD0 INPUT/OUTPUT PORT 1 I/O0 I/O1 I/O2 I/O3 I/O4 I/O5 I/O6 I/O7 INPUT/OUTPUT PORT 2 I/O8 I/O9 I/O10 I/O11 I/O12 I/O13 I/O14 I/O15 8 BIT AD1 WRITE PULSE AD2 READ PULSE SCL SMBus CONTROL INPUT FILTER SDA 8 BIT N WRITE PULSE READ PULSE V+ INT POWER-ON RESET MAX7312 GND Figure 1.
PAGE 7
2-Wire-Interfaced 16-Bit I/O Port Expander with Interrupt and Hot-Insertion Protection MAX7312 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. Bit Transfer START CONDITION CLOCK PULSE FOR ACKNOWLEDGMENT SCL 1 2 8 9 SDA BY TRANSMITTER S SDA BY RECEIVER Figure 5.
PAGE 8
MAX7312 2-Wire-Interfaced 16-Bit I/O Port Expander with Interrupt and Hot-Insertion Protection Slave address pins AD2, AD1, and AD0 choose 1 of 64 slave ID addresses (Table 7). MAX7312 generates the acknowledge bit since the MAX7312 is the recipient. When the MAX7312 is transmitting to the master, the master generates the acknowledge bit. Data Bus Transaction The command byte is the first byte to follow the 8-bit device slave address during a write transmission (Table 1, Figure 7).
PAGE 9
2-Wire-Interfaced 16-Bit I/O Port Expander with Interrupt and Hot-Insertion Protection Reading Port Registers To read the device data, the bus master must first send the MAX7312 address with the R/W bit set to zero, followed by the command byte, which determines which register is accessed. After a restart, the bus master must then send the MAX7312 address with the R/W bit set to 1. Data from the register defined by the command byte is then sent from the MAX7312 to the master (Figures 8, 9).
PAGE 10
MAX7312 2-Wire-Interfaced 16-Bit I/O Port Expander with Interrupt and Hot-Insertion Protection Input/Output Port Data is clocked into a register on the falling edge of the acknowledge clock pulse. After reading the first byte, additional bytes may be read and reflect the content in the other register in the pair. For example, if input port 1 is read, the next byte read is input port 2.
PAGE 11
2-Wire-Interfaced 16-Bit I/O Port Expander with Interrupt and Hot-Insertion Protection MAX7312 Table 2. Registers 0x00, 0x01—Input Port Registers BIT I7 I6 I5 I4 I3 I2 I1 I0 I15 I14 I13 I12 I11 I10 I9 I8 Table 3. Registers 0x02, 0x03—Output Port Registers BIT Power-up default O7 O6 O5 O4 O3 O2 O1 O0 O15 O14 O13 O12 O11 O10 O9 O8 1 1 1 1 1 1 1 1 Table 4.
PAGE 12
MAX7312 2-Wire-Interfaced 16-Bit I/O Port Expander with Interrupt and Hot-Insertion Protection Table 7.
PAGE 13
2-Wire-Interfaced 16-Bit I/O Port Expander with Interrupt and Hot-Insertion Protection AD2 AD1 AD0 A6 A5 A4 A3 A2 A1 A0 ADDRESS (HEX) SCL SCL GND 1 0 1 0 0 0 0 0xA0 0xA2 + SCL SCL V 1 0 1 0 0 0 1 SCL SDA GND 1 0 1 0 0 1 0 0xA4 SCL SDA V+ 1 0 1 0 0 1 1 0xA6 SDA SCL GND 1 0 1 0 1 0 0 0xA8 SDA SCL V+ 1 0 1 0 1 0 1 0xAA SDA SDA GND 1 0 1 0 1 1 0 0xAC + SDA SDA V 1 0 1 0 1 1 1 0xAE SCL SCL SCL 1 0 1 1 0 0
PAGE 14
Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) INCHES N E DIM A A1 B C e E H L H MAX MIN 0.093 0.104 0.004 0.012 0.014 0.019 0.009 0.013 0.050 0.291 0.299 0.394 0.419 0.050 0.016 SOICW.EPS MAX7312 2-Wire-Interfaced 16-Bit I/O Port Expander with Interrupt and Hot-Insertion Protection MILLIMETERS MIN 2.35 0.10 0.35 0.23 MAX 2.65 0.30 0.49 0.32 1.27 7.40 7.
PAGE 15
2-Wire-Interfaced 16-Bit I/O Port Expander with Interrupt and Hot-Insertion Protection SSOP.EPS 2 1 INCHES E H MILLIMETERS DIM MIN MAX MIN MAX A 0.068 0.078 1.73 1.99 A1 0.002 0.008 0.05 0.21 B 0.010 0.015 0.25 0.38 C D 0.20 0.09 0.004 0.008 SEE VARIATIONS E 0.205 e 0.212 0.0256 BSC 5.20 MILLIMETERS INCHES D D D D D 5.38 MIN MAX MIN MAX 0.239 0.239 0.278 0.249 0.249 0.289 6.07 6.07 7.07 6.33 6.33 7.33 0.317 0.397 0.328 0.407 8.07 10.07 8.33 10.
PAGE 16
Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) 24L QFN THIN.EPS MAX7312 2-Wire-Interfaced 16-Bit I/O Port Expander with Interrupt and Hot-Insertion Protection Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.