2 MAX7321 I C Port Expander with 8 Open-Drain I/Os General Description Features 2 The MAX7321 2-wire serial-interfaced peripheral features 400kHz I C Serial Interface eight open-drain I/O ports with selectable internal pullups +1.71V to +5.5V Operating Voltage and transition detection. Any port may be used as a logic 8 Open-Drain I/O Ports Rated to 20mA Sink Current input or an open-drain output. Ports are overvoltage protected to +6V independent of supply voltage. I/O Ports Are Overvoltage Protected to +6V All I/O ports configured as inputs are continuously Any Port Can Be a Logic Input or an Open-Drain monitored for state changes (transition detection). State Output changes are indicated by the open-drain INT output. Selectable I/O Port Power-Up Default Logic States The interrupt is latched, allowing detection of transient changes. When the MAX7321 is subsequently accessed Transient Changes Are Latched, Allowing Detection through the serial interface, any pending interrupt is Between Read Operations cleared. INT Output Alerts Change on Inputs The open-drain outputs are rated to sink 20mA and are AD0 and AD2 Inputs Select from 16 Slave capable of driving LEDs. Addresses The RST input clears the serial interface, terminating any Low 0.6A (typ) Standby Current 2 I C communication to or from the MAX7321. -40C to +125C Operating Temperature The MAX7321 uses two address inputs with four-level 2 logic to allow 16 I C slave addresses. The slave address Ordering Information also determines the power-up logic state for the I/O ports, PIN- TOP and enables or disables internal 40k pullups in groups PART TEMP RANGE PACKAGE MARK of four ports. MAX7321AEE+ -40C to +125C 16 QSOP The MAX7321 is one device in a family of pin-compatible port expanders with a choice of input ports, open-drain MAX7321ATE+ -40C to +125C 16 TQFN-EP* ADC I/O ports, and push-pull output ports (see Table 1). +Denotes a lead(Pb)-free/RoHS-compliant package. The MAX7321 is available in 16-pin QSOP and TQFN *EP = Exposed pad. packages, and is specified over the automotive temper- ature range (-40C to +125C). Selector Guide OPEN- Applications INTERRUPT PUSH-PULL PART INPUTS DRAIN Cell Phones Notebooks MASK OUTPUTS OUTPUTS SAN/NAS Satellite Radio MAX7319 8 Yes Servers MAX7320 8 Pin Configurations MAX7321 Up to 8 Up to 8 + AD0 1 16 V+ MAX7322 4 Yes 4 RST 2 15 SDA MAX7323 Up to 4 Up to 4 4 AD2 3 14 SCL MAX7321 MAX7328 Up to 8 Up to 8 P0 4 13 INT P1 5 12 P7 MAX7329 Up to 8 Up to 8 P2 6 11 P6 P3 7 10 P5 Pin Configurations are continued at end of data sheet. GND 8 9 P4 Typical Application Circuit and Functional Diagram appear QSOP at end of data sheet. 19-3738 Rev 4 7/142 MAX7321 I C Port Expander with 8 Open-Drain I/Os Absolute Maximum Ratings (All voltages referenced to GND.) Continuous Power Dissipation (T = +70C) A Supply Voltage V+ ...................................................-0.3V to +6V 16-Pin QSOP (derate 8.3mW/C above +70C)..........667mW SCL, SDA, AD0, AD2, RST, INT, P0P7 ...............-0.3V to +6V 16-Pin TQFN (derate 15.6mW/C above +70C) ......1250mW P0P7 Sink Current ....................................................... 25mA Operating Temperature Range ......................... -40C to +125C SDA Sink Current .............................................................. 10mA Junction Temperature ......................................................+150C INT Sink Current.................................................................10mA Storage Temperature Range ............................ -65C to +150C Total V+ Current .................................................................50mA Lead Temperature (soldering, 10s) .................................+300C Total GND Current ...........................................................100mA Soldering Temperature (reflow) QSOP ..........................................................................+240C TQFN ...........................................................................+260C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Electrical Characteristics (V+ = +1.71V to +5.5V, T = -40C to +125C, unless otherwise noted. Typical values are at V+ = +3.3V, T = +25C.) (Note 1) A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating Supply Voltage V+ 1.71 5.50 V Power-On Reset Voltage V V+ falling 1.6 V POR Standby Current I SCL and SDA and other digital inputs at V+ 0.6 1.5 A STB (Interface Idle) Supply Current I+ f = 400kHz other digital inputs at V+ 23 55 A SCL (Interface Running) V+ < 1.8V 0.8 x V+ Input High Voltage V V IH SDA, SCL, AD0, AD2, RST, P0P7 V+ 1.8 0.7 x V+ V+ < 1.8V 0.2 x V+ Input Low Voltage V V IL SDA, SCL, AD0, AD2, RST, P0P7 V+ 1.8V 0.3 x V+ Input Leakage Current SDA, SCL, AD0, AD2, RST, P0P7 at V+ or I , I -0.2 +0.2 A IH IL SDA, SCL, AD0, AD2, RST, P0P7 GND, internal pullup disabled Input Capacitance 10 pF SDA, SCL, AD0, AD2, RST, P0P7 V+ = +1.71V, I = 5mA 90 180 SINK V+ = +2.5V, I = 10mA 110 210 SINK Output Low Voltage P0P7 V mV OL V+ = +3.3V, I = 15mA 130 230 SINK V+ = +5V, I = 20mA 140 250 SINK Output Low Voltage SDA V I = 6mA 250 mV OLSDA SINK Output Low Voltage INT V I = 5mA 130 250 mV OLINT SINK Port Input Pullup Resistor R 25 40 55 k PU Maxim Integrated 2 www.maximintegrated.com