MAX7322 Maxim, MAX7322 Datasheet
MAX7322
Available stocks
Related parts for MAX7322
MAX7322 Summary of contents
Page 1
... The MAX7322 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). ...
Page 2
... Total GND Current ...........................................................100mA 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 ...
Page 3
PORT AND INTERRUPT INT TIMING CHARACTERISTICS (V+ = +1.71V to +5.5V -40°C to +125°C, unless otherwise noted. Typical values are +3.3V PARAMETER SYMBOL Port Output Data Valid Port Input Setup Time Port Input ...
Page 4
I C Port Expander with 4 Push-Pull Outputs and 4 Inputs (T = +25°C, unless otherwise noted.) A STANDBY CURRENT vs. TEMPERATURE 2.0 1.8 1.6 1.4 1 +5.0V 1 +3. +2.5V 0.8 0.6 ...
Page 5
... The MAX7322 is rated to sink a total of 100mA and source a total of 50mA from all four combined outputs. The MAX7322 is set to one ...
Page 6
... I C Port Expander with 4 Push-Pull Outputs and 4 Inputs Table 1. MAX7319–MAX7329 Family Comparison (continued PART SLAVE INPUTS INTERRUPT ADDRESS MAX7321 110xxxx MAX7322 110xxxx 4 MAX7323 110xxxx MAX7328 0100xxx MAX7329 0111xxx 6 _______________________________________________________________________________________ INPUT OPEN- PUSH DRAIN PULL MASK ...
Page 7
... MAX7326 4 MAX7327 When the MAX7322 is read through the serial interface the actual logic levels at the ports are read back. The four input ports offer latching transition detection functionality. All input ports are continuously monitored for changes. An input change sets flag bits that identify the changed input(s) ...
Page 8
... SDA and SCL behavior. If one of the other 12 address combinations is used, an unexpected combination of pullups might be asserted until the first I sarily the MAX7322) is put on the bus, and an unexpect- ed combination of ports may initialize as logic-low outputs instead of inputs or logic-high outputs. Port inputs switch at CMOS logic levels as determined by the expander’ ...
Page 9
... The change flags indicate whether a permanent or transient change has occurred on any input since the MAX7322 was last accessed. Write one byte to the MAX7322 to set the output port levels for the four push-pull outputs, and the interrupt mask for the four inputs simultaneously. ...
Page 10
... SCL output. Each transmission consists of a START condition sent by a master, followed by the MAX7322’s 7-bit slave address plus R/W bit, one or more data bytes, and finally a STOP condition (Figure 2) ...
Page 11
... I address in the case of a single-byte or 2-byte read interface. A single-byte write to the MAX7322 sets the logic state 2 C slave of the four output ports and the 4-bit interrupt mask resistor, and clears both the internal transition flags and the INT output when the device acknowledges the slave address byte ...
Page 12
... C Port Expander with 4 Push-Pull Outputs and 4 Inputs Reading from the MAX7322 A read from the MAX7322 starts with the master trans- mitting the MAX7322’s slave address with the R/W bit set high. The MAX7322 acknowledges the slave address, and samples the ports during the acknowl- edge bit ...
Page 13
... Writing to the MAX7322 A write to the MAX7322 starts with the master transmit- ting the MAX7322’s slave address with the R/W bit set low. The MAX7322 acknowledges the slave address, and samples the ports (takes a snapshot) during acknowledge. INT deasserts during the slave acknowl- edge ...
Page 14
... GND, the appropriate protection diode clamps the output to a diode drop above V+ or below GND. When the MAX7322 is powered down (V+ = 0), each output port appears as a diode clamp to GND (Figure 9). Each of the four input ports I2–I5 has a protection diode to GND (Figure 10) ...
Page 15
... I3 I4 PORTS μ SCL O7 SDA RST INT INT PROCESS: BiCMOS V+ SDA SCL INT Typical Application Circuit 3.3V 0.047μF V+ SCL O7 OUTPUT SDA O6 OUTPUT MAX7322 RST I5 I4 INT I3 I2 AD0 OUTPUT O1 AD2 O0 OUTPUT GND Chip Information INPUT INPUT INPUT INPUT 15 ...
Page 16
... I C Port Expander with 4 Push-Pull Outputs and 4 Inputs (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) E MARKING E/2 AAAA D 0. ______________________________________________________________________________________ ( ...
Page 17
... For the latest package outline information www.maxim-ic.com/packages.) PKG 8L 3x3 12L 3x3 REF. MIN. NOM. MAX. MIN. NOM. MAX. A 0.70 0.75 0.80 0.70 0.75 0.80 b 0.25 0.30 0.35 0.20 0.25 0.30 D 2.90 3.00 3.10 2.90 3.00 3.10 E 2.90 3.00 3.10 2.90 3.00 3.10 e 0.65 BSC. 0.50 BSC. L 0.35 0.55 0.75 0.45 0.55 0. ...
Page 18
... Revision History Pages changed at Rev 1: 1–18 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. ...