Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsInterface ICsInterface IC - I/O extensions POR I²C 400 kHz TQFN 16 EP

Pin Configurations, Typical Application Circuit, and

Functional Diagram appear at end of data sheet.

● Cell Phones

● SAN/NAS

● Servers

● Notebooks

● Satellite Radio

General Description

The MAX7319 2-wire serial-interfaced peripheral

fea-tures eight input ports with selectable internal pullups,

overvoltage protection to +6V, and transition detection

with interrupt output.

All input ports are continuously monitored for state

changes (transition detection). Transitions are latched,

allowing detection of transient changes. Any combination

of inputs can be selected using the interrupt mask to assert

the INT output. When the MAX7319 is subsequently

accessed through the serial interface, any pending

interrupt is cleared.

The +5.5V tolerant RST input clears the serial

interface, terminating any I

C communication to or from

the MAX7319.

The MAX7319 uses two address inputs with four-level

logic to allow 16 I

C slave addresses. The slave address

also enables or disables internal 40kΩ pullups in groups

of four ports.

The MAX7319 supports hot insertion. All eight input ports,

the serial interface SDA, SCL, AD0, AD2, INT, and RST

remain high impedance in power-down (V+ = 0) with up

to +6V asserted on them.

The MAX7319 is one device in a family of pin-compatible

port expanders with a choice of input ports, open-drain

I/O ports, and push-pull output ports (see Table 1).

The MAX7319 is available in 16-pin QSOP and 16-pin

TQFN packages, and is specified over the automotive

temperature range (-40°C to +125°C).

Applications

Features

● 400kHz, +5.5V-Tolerant I

C Serial Interface

● +1.71V to +5.5V Operating Voltage

● Eight Input Ports with Maskable, Latching Transition

Detection

● Input Ports are Overvoltage Protected to +6V

● Transient Changes are Latched, Allowing Detection

Between Read Operations

● INT Output Alerts Change on Any Selection of Inputs

● AD0 and AD2 Inputs Select from 16 Slave Addresses

● Low 0.6µA (typ) Standby Current

● -40°C to +125°C Operating Temperature Range

19-3809; Rev 2; 5/14

*Second source to PCF8574.

**Second source to PCF8574A.

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

PART INPUTS INTERRUPT MASK OPEN-DRAIN OUTPUTS PUSH-PULL OUTPUTS

MAX7319 8 Yes — —

MAX7320 — — — 8

MAX7321 Up to 8 — Up to 8 —

MAX7322 4 Yes — 4

MAX7323 Up to 4 — Up to 4 4

MAX7328*

Up to 8

—

Up to 8

—

MAX7329** — —

PART TEMP RANGE

PIN-

PACKAGE

TOP

MARK

MAX7319AEE+ -40° TO +125°C 16 QSOP —

MAX7319ATE+ -40° TO +125°C 16 TQFN-EP* ADA

MAX7319 I

C Port Expander with Eight Inputs

and Maskable Transition Detection

Selector Guide

Ordering Information

EVALUATION KIT AVAILABLE

Summary of content (15 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX7319 I2C Port Expander with Eight Inputs and Maskable Transition Detection General Description The MAX7319 2-wire serial-interfaced peripheral fea-tures eight input ports with selectable internal pullups, overvoltage protection to +6V, and transition detection with interrupt output. All input ports are continuously monitored for state changes (transition detection). Transitions are latched, allowing detection of transient changes.
PAGE 2
MAX7319 I2C Port Expander with Eight Inputs and Maskable Transition Detection Absolute Maximum Ratings (All voltages referenced to GND.) Supply Voltage V+....................................................-0.3V to +6V SCL, SDA, AD0, AD2, RST, INT, I0–I7....................-0.3V to +6V SDA Input Current.............................................................. 10mA INT Input Current................................................................10mA Total V+ Current...................................
PAGE 3
MAX7319 I2C Port Expander with Eight Inputs and Maskable Transition Detection Port and Interrupt INT Timing Characteristics (V+ = +1.71V to +5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at V+ = +3.3V, TA = +25°C.
PAGE 4
MAX7319 I2C Port Expander with Eight Inputs and Maskable Transition Detection Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) 1.4 1.2 V+ = +5.0V 1.0 V+ = +2.5V 0.8 V+ = +3.3V 0.6 0.4 V+ = +1.71V 0.2 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 SUPPLY CURRENT vs. TEMPERATURE fSCL = 400kHz V+ = +5.0V 50 SUPPLY CURRENT (µA) STANDBY CURRENT (µA) 1.6 MAX7319 toc01 fSCL = 0kHz 1.8 60 MAX7319 toc02 STANDBY CURRENT vs. TEMPERATURE 2.0 40 V+ = +3.3V 30 20 V+ = +2.
PAGE 5
MAX7319 I2C Port Expander with Eight Inputs and Maskable Transition Detection Detailed Description Functional Overview MAX7319–MAX7329 Family Comparison The MAX7319–MAX7323 family consists of five pin-compatible, eight-port expanders. Each version is optimized for different applications. The MAX7328 and MAX7329 are second sources to the PCF8574 and PCF8574A.
PAGE 6
MAX7319 I2C Port Expander with Eight Inputs and Maskable Transition Detection Table 1. MAX7319–MAX7329 Family Comparison (continued) PART I2C INPUT SLAVE INPUTS INTERRUPT ADDRESS MASK MAX7323 MAX7328 MAX7329 110xxxx 0100xxx 0111xxx Up to 4 — Up to 8 — OPENDRAIN OUTPUTS PUSHPULL OUTPUTS APPLICATION 4 Four I/O, four output-only versions: Four open-drain I/O ports with latching transition detection interrupt and selectable pullups. Four push-pull outputs with selectable power-up default levels.
PAGE 7
MAX7319 I2C Port Expander with Eight Inputs and Maskable Transition Detection Table 2.
PAGE 8
MAX7319 I2C Port Expander with Eight Inputs and Maskable Transition Detection Table 3.
PAGE 9
MAX7319 I2C Port Expander with Eight Inputs and Maskable Transition Detection SDA tSU,STA tSU,DAT tLOW tHD,DAT tBUF tHD,STA tSU,STO tHIGH SCL tHD,STA tR tF START CONDITION REPEATED START CONDITION STOP CONDITION START CONDITION Figure 1. 2-Wire Serial-Interface Timing Details SDA operates as both an input and an open-drain output. A pullup resistor, typically 4.7kΩ, is required on SDA. SCL operates only as an input. A pullup resistor, typically 4.
PAGE 10
MAX7319 I2C Port Expander with Eight Inputs and Maskable Transition Detection Slave Address A 2-byte read returns the status of the eight input ports (as for a single-byte read), followed by the transition flags. The internal transition flags and the INT output are cleared when the MAX7319 acknowledges the slave address byte, but the previous transition flag data is sent as the second byte (Figure 8). The MAX7319 has a 7-bit slave address (Figure 5).
PAGE 11
MAX7319 I2C Port Expander with Eight Inputs and Maskable Transition Detection Input port data is sampled during the preceding I2C acknowledge bit (the acknowledge bit for the I2C slave address in the case of a single-byte or 2-byte read). When the master reads 1 byte from the MAX7319 and subsequently issues a STOP condition (Figure 6), the MAX7319 transmits the current port data, clears the transition flags, and resets the transition detection. INT deasserts during the slave address acknowledge.
PAGE 12
MAX7319 I2C Port Expander with Eight Inputs and Maskable Transition Detection 1 SCL 2 3 4 5 6 7 8 DATA TO INTERRUPT MASK SLAVE ADDRESS S SDA START CONDITION 0 A DATA 1 DATA TO INTERRUPT MASK DATA 2 A A R/W tPV tPV S = START CONDITION P = STOP CONDITION SHADED = SLAVE TRANSMISSION N = NOT ACKNOWLEDGE Figure 8. Writing to the MAX7319 Writing to the MAX7319 A write to the MAX7319 starts with the master transmitting the MAX7319’s slave address with the R/W bit set low.
PAGE 13
MAX7319 I2C Port Expander with Eight Inputs and Maskable Transition Detection Power-Supply Considerations The MAX7319 operates with a +1.71V to +5.5V supply voltage over the -40°C to +125°C temperature range. Bypass V+ to GND with a ceramic capacitor of at least 0.047µF as close to the device as possible. For the TQFN version, connect the exposed pad to GND. Compatibility with MAX6965, MAX7315, and MAX7316 The MAX7319 is subset pin compatible with the MAX6965, MAX7315, and MAX7316.
PAGE 14
MAX7319 I2C Port Expander with Eight Inputs and Maskable Transition Detection Functional Diagram AD0 AD2 SCL SDA RST INPUT FILTER I2 C CONTROL INPUT PORTS I7 I6 I5 I4 I3 I2 I1 I0 INT POWER-ON RESET MAX7319 Chip Information PROCESS: BiCMOS CONNECT EXPOSED PAD TO GND www.maximintegrated.com Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages.
PAGE 15
MAX7319 I2C Port Expander with Eight Inputs and Maskable Transition Detection Revision History REVISION NUMBER REVISION DATE 2 5/14 PAGES CHANGED DESCRIPTION No /V OPNs; removed automotive reference from Applications section; updated Packaging Information 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.