Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsInterface ICsInterface IC - I/O extensions POR I²C 400 kHz TQFN 24 EP

Typical Application Circuit and Functional Diagram appear

at end of data sheet.

Pin Configurations continued at end of data sheet.

● Cell Phones

● SAN/NAS

● Servers

● Notebooks

● Satellite Radio

General Description

The MAX7327, a 2-wire serial-interfaced peripheral,

features 12 push-pull outputs and four configurable open-

drain I/O ports with selectable internal pullups and tran-

sition detection. Ports are overvoltage protected to +6V,

independent of supply voltage.

The four I/O ports configured as inputs are continuously

monitored for state changes (transition detection). State

changes are indicated by the open-drain, +6V-tolerant

INT output. The interrupt is latched, detecting transient

changes. When the MAX7327 is subsequently accessed

through the serial interface, any pending interrupt is

cleared. The 12 push-pull and the four open-drain outputs

are rated to sink 20mA, and are capable of driving LEDs.

The RST input clears the serial interface, terminating any

C communication to or from the MAX7327.

The MAX7327 uses two address inputs with four-level

logic to allow 16 I

C slave addresses. The slave address

also determines the power-up logic state for the I/O ports,

and enables or disables internal 40kΩ pullups in groups

of two ports.

The MAX7327 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 MAX7327 is available in the 24-pin QSOP and

TQFN packages, and is specified over the -40°C to

+125°C automotive temperature range.

Applications

Features

● 400kHz I

C Serial Interface

● +1.71V to +5.5V Operating Voltage

● 12 Push-Pull Output Ports, Rated at 20mA Sink

Current

● 4 Open-Drain I/O Ports, Rated at 20mA Sink Current

● I/O Ports are Overvoltage Protected to +6V

● Selectable I/O Port Power-Up Default Logic States

● Transient Changes are Latched, Allowing Detection

Between Read Operations

● INT Output Alerts Changes on Inputs

● AD0 and AD2 Inputs Select from 16 Slave Addresses

● Low 0.6µA (typ) Standby Current

● -40°C to +125°C Temperature Range

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

**EP = Exposed pad.

PART INPUTS

INTERRUPT

MASK

OPEN-

DRAIN

OUTPUTS

PUSH-PULL

OUTPUTS

MAX7324 8 Yes — 8

MAX7325 Up to 8 — Up to 8 8

MAX7326 4 Yes — 12

MAX7327 Up to 4 — Up to 4 12

PART TEMP RANGE PIN-PACKAGE

MAX7327AEG+ -40°C to +125°C 24 QSOP

MAX7327ATG+ -40°C to +125°C

24 TQFN-EP*

(4mm x 4mm)

MAX7327AATG+ -40°C to +125°C

24 TQFN-EP*

(3.5mm x 3.5mm)

TQFN (4mm x 4mm)

TOP VIEW

MAX7327

1 2 3 4 5 6

18 17 16 15 14 13

SCL

V+

SDA

INT

AD2

AD0

O15

O13

O12

O11

RST

O10

GND

O14

EXPOSED PADDLE

MAX7327 I

C Port Expander with 12 Push-Pull

Outputs and 4 Open-Drain I/Os

19-3805; Rev 1; 5/14

Selector Guide

Ordering Information

Pin Congurations

EVALUATION KIT AVAILABLE

Summary of content (17 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX7327 I2C Port Expander with 12 Push-Pull Outputs and 4 Open-Drain I/Os General Description Features The MAX7327, a 2-wire serial-interfaced peripheral, features 12 push-pull outputs and four configurable opendrain I/O ports with selectable internal pullups and transition detection. Ports are overvoltage protected to +6V, independent of supply voltage. The four I/O ports configured as inputs are continuously monitored for state changes (transition detection).
PAGE 2
I2C Port Expander with 12 Push-Pull Outputs and 4 Open-Drain I/Os MAX7327 Absolute Maximum Ratings (All voltages referenced to GND.) Supply Voltage V+....................................................-0.3V to +6V SCL, SDA, AD0, AD2, RST, INT, P2–P5 ................-0.3V to +6V O0, O1, O6–O15............................................ -0.3V to V+ + 0.3V O0, O1, O6–O15 Output Current .....................................±25mA P2–P5 Sink Current ...........................................................
PAGE 3
I2C Port Expander with 12 Push-Pull Outputs and 4 Open-Drain I/Os MAX7327 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
I2C Port Expander with 12 Push-Pull Outputs and 4 Open-Drain I/Os MAX7327 Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) 1.4 1.2 V+ = +5.0V 1.0 V+ = +2.5V 0.8 0.6 0.4 OUTPUT VOLTAGE LOW vs. TEMPERATURE 0.20 V+ = +3.3V ISINK = 15mA 0.15 V+ = +5.0V ISINK = 20mA 0.10 V+ = +2.5V ISINK = 10mA 0.05 0 30 V+ = +1.71V ISINK = 5mA V+ = +1.62V ISINK = 4mA -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) MAX7327 toc02 V+ = +3.
PAGE 5
I2C Port Expander with 12 Push-Pull Outputs and 4 Open-Drain I/Os MAX7327 Detailed Description MAX7319–MAX7329 Family Comparison The MAX7324–MAX7327 family consists of four pincompatible, 16-port expanders that integrate the functions of the MAX7320 and one of either the MAX7319, MAX7321, MAX7322, or MAX7323. Functional Overview The MAX7327 is a general-purpose port expander operating from a +1.71V to +5.
PAGE 6
I2C Port Expander with 12 Push-Pull Outputs and 4 Open-Drain I/Os MAX7327 Table 1. MAX7319–MAX7329 Family Comparison (continued) PART I2C INPUT SLAVE INPUTS INTERRUPT ADDRESS MASK OPENDRAIN OUTPUTS PUSHPULL OUTPUTS CONFIGURATION 4 input-only, 12 push-pull output versions: 4 input ports with programmable latching transition detection interrupt and selectable pullups. MAX7326 4 Yes — 12 101xxxx and 110xxxx 12 push-pull outputs with selectable default logic levels.
PAGE 7
I2C Port Expander with 12 Push-Pull Outputs and 4 Open-Drain I/Os MAX7327 Table 1. MAX7319–MAX7329 Family Comparison (continued) PART I2C INPUT SLAVE INPUTS INTERRUPT ADDRESS MASK OPENDRAIN OUTPUTS PUSHPULL OUTPUTS CONFIGURATION MAX7323 110xxxx Up to 4 — Up to 4 4 4 I/O, 4 output-only versions: 4 open-drain I/O ports with latching transition detection interrupt and selectable pullups. 4 push-pull outputs with selectable power-up default levels.
PAGE 8
I2C Port Expander with 12 Push-Pull Outputs and 4 Open-Drain I/Os MAX7327 address can be configured dynamically in the application without cycling the device supply. pullups and sets the default logic state to low. The pullup configuration is correct on power-up for a standard I2C configuration, where SDA or SCL are pulled up to V+ by the external I2C pullup resistors. On initial power-up, the MAX7327 cannot decode the address inputs AD0 and AD2 fully until the first I2C transmission.
PAGE 9
I2C Port Expander with 12 Push-Pull Outputs and 4 Open-Drain I/Os MAX7327 Table 3.
PAGE 10
I2C Port Expander with 12 Push-Pull Outputs and 4 Open-Drain I/Os MAX7327 Serial Interface addresses plus R/W bits, one or more data bytes, and finally a STOP condition (Figure 2). Serial Addressing The MAX7327 operates as a slave that sends and receives data through an I2C interface. The interface uses a serial-data line (SDA) and a serial-clock line (SCL) to achieve bidirectional communication between master(s) and slave(s).
PAGE 11
I2C Port Expander with 12 Push-Pull Outputs and 4 Open-Drain I/Os MAX7327 Acknowledge Accessing the MAX7327 The acknowledge bit is a clocked 9th bit the recipient uses to acknowledge receipt of each byte of data (Figure 4). Each byte transferred effectively requires 9 bits. The master generates the 9th clock pulse, and the recipient pulls down SDA during the acknowledge clock pulse, such that the SDA line is stable low during the high period of the clock pulse.
PAGE 12
I2C Port Expander with 12 Push-Pull Outputs and 4 Open-Drain I/Os MAX7327 Reading the MAX7327 A single-byte read from the group B ports of the MAX7327 returns the status of the eight output ports, read back as inputs. A read from the group A ports of the MAX7327 starts with the master transmitting the port group’s slave address with the R/W bit set to high. The MAX7327 acknowledges the slave address, and samples the status of the ports during the acknowledge bit.
PAGE 13
I2C Port Expander with 12 Push-Pull Outputs and 4 Open-Drain I/Os MAX7327 sition detection. INT deasserts during the slave acknowledge. The new snapshot data is the current port data transmitted to the master, and therefore, port changes occuring during the transmission are detected. INT remains high until the STOP condition. A read from the group B ports of the MAX7327 starts with the master transmitting the group’s slave address with the R/W bit set high.
PAGE 14
I2C Port Expander with 12 Push-Pull Outputs and 4 Open-Drain I/Os MAX7327 bytes from the group B ports of the MAX7327, then issue a STOP condition. In this case, the MAX7327 resamples the port outputs during each acknowledge and transmits the new data each time. of the four I/O ports (P2–P5) are driven from a lower logic level, such as +2.5V. For V+ < 1.8V, apply a minimum voltage of 0.8 x V+ to assert a logic-high on any input. For a V+ ≥ 1.8V, apply a voltage of 0.7 x V+ to assert a logic-high.
PAGE 15
I2C Port Expander with 12 Push-Pull Outputs and 4 Open-Drain I/Os MAX7327 V+ and GND continue to appear as a diode clamp from each output to GND (Figure 10). VOL is the output low voltage of the MAX7327 when sinking ILED (V). Each of the four P2–P5 I/O ports has a protection diode to GND (Figure 11). When a port output is driven to a voltage lower than GND, the protection diode clamps the output to a diode drop below GND. ILED is the desired operating current of the LED (A).
PAGE 16
I2C Port Expander with 12 Push-Pull Outputs and 4 Open-Drain I/Os MAX7327 Functional Diagram Typical Application Circuit 3.
PAGE 17
I2C Port Expander with 12 Push-Pull Outputs and 4 Open-Drain I/Os MAX7327 Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 0 8/06 Initial release 1 7/14 No /V OPNs; removed automotive reference from Applications section; updated Package Information DESCRIPTION — 1, 18–20 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.