MAX7327 Maxim, MAX7327 Datasheet
MAX7327
Available stocks
Related parts for MAX7327
MAX7327 Summary of contents
Page 1
... 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). ...
Page 2
... Total V+ Current .................................................................50mA 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
I C Port Expander with 12 Push-Pull 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 ...
Page 4
I C Port Expander with 12 Push-Pull Outputs and 4 Open-Drain I/ +25°C, unless otherwise noted.) A STANDBY CURRENT vs. TEMPERATURE 2.0 1.8 1.6 1.4 1.2 1 +3. +2.5V 0.8 0.6 0.4 V+ ...
Page 5
... Any of the four open-drain ports can be configured as a logic input by setting the port output logic-high (logic- high for an open-drain output is high impedance). When the MAX7327 is read through the serial interface, the actual logic levels at the ports are read back. INPUT OPEN- ...
Page 6
... I C Port Expander with 12 Push-Pull Outputs and 4 Open-Drain I/Os Table 1. MAX7319–MAX7329 Family Comparison (continued PART SLAVE INPUTS INTERRUPT ADDRESS MAX7326 4 101xxxx and 110xxxx MAX7327 8-PORT EXPANDERS MAX7319 110xxxx 8 MAX7320 101xxxx — MAX7321 110xxxx MAX7322 110xxxx _______________________________________________________________________________________ ...
Page 7
... Pullups are enabled on the input ports in groups of two (see Table 2). The MAX7327 slave address is determined on each I transmission, regardless of whether the transmission is actually addressing the MAX7327. The MAX7327 distin- guishes whether address inputs AD0 and AD2 are con- nected to SDA or SCL instead of fixed-logic levels V+ or GND during the transmission ...
Page 8
... P3, and uses AD2 to select whether pullups are enabled for ports P4 and P5. The rule is that a logic- high, SDA, or SCL connection selects the pullups and sets the logic state to high. A logic-low deselects the Table 2. MAX7327 Address Map for Outputs O0, O1, O6, O7, and Ports P2–P5 PIN DEVICE ADDRESS CONNECTION ...
Page 9
... I C acknowledge of every MAX7327 read and write access. The previous port transition flags are read through the serial interface as the second byte of a 2-byte read sequence. _______________________________________________________________________________________ ...
Page 10
... The master initiates all data transfers to and from the MAX7327 and generates the SCL clock that syn- chronizes the data transfer (Figure 1). SDA operates as both an input and an open-drain out- put. A pullup resistor, typically 4.7kΩ ...
Page 11
... MAX7327 slave address are always 1, 1, and 0 (O0, O1, P2–P5, O6, O7 and 1 (O8–O15). Connect AD0 and AD2 to GND, V+ SDA, or SCL to select slave , address bits A3, A2, A1, and A0. The MAX7327 has 16 possible slave addresses (Tables 2 and 3), allowing MAX7327 devices bus. ...
Page 12
... S SCL PORTS t IV INT OUTPUT Figure 6. Reading Group A Ports of the MAX7327 (1 Data Byte) 12 ______________________________________________________________________________________ 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 sta- tus of the ports during the acknowledge bit ...
Page 13
... ACKNOWLEDGE FROM MAX7327 S MAX7327 SLAVE ADDRESS SCL PORTS t IV INT OUTPUT Figure 7. Reading Group A Ports of the MAX7327 (2 Data Bytes) ACKNOWLEDGE FROM MAX7327 MAX7327 SLAVE ADDRESS S SCL Figure 8. Reading Group B Ports of MAX7327 ______________________________________________________________________________________ Outputs and 4 Open-Drain I/Os A read from the group B ports of the MAX7327 starts with the master transmitting the group’ ...
Page 14
... Writing to the MAX7327 A write to the group ports of the MAX7327 starts with the master transmitting the group’s slave address with the R/W bit set low. The MAX7327 acknowledges the slave address, and samples the ports during the acknowledge bit ...
Page 15
... Any combi- nation of outputs can be used as part of a load-sharing design because any combination of ports can be set or cleared at the same time by writing to the MAX7327. Do not exceed a total sink current of 100mA for the device. The MAX7327 must be protected from the negative ...
Page 16
... PROCESS: BiCMOS SDA 22 SCL 21 AD0 20 O15 O14 19 18 O13 17 O12 16 O11 15 O10 Typical Application Circuit 3.3V V+ SCL MAX7327 SDA O15 RST O14 INT 013 012 O11 OUTPUT O10 OUTPUT OUTPUT O9 O8 OUTPUT O7 OUTPUT O6 OUTPUT P5 INPUT/OUTPUT P4 INPUT/OUTPUT P3 INPUT/OUTPUT P2 INPUT/OUTPUT AD0 ...
Page 17
... I C Port Expander with 12 Push-Pull (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.) ______________________________________________________________________________________ Outputs and 4 Open-Drain I/Os Package Information PACKAGE OUTLINE, 12, 16, 20, 24, 28L THIN QFN, 4x4x0.8mm ...
Page 18
... I C Port Expander with 12 Push-Pull Outputs and 4 Open-Drain I/Os (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.) 18 ______________________________________________________________________________________ Package Information (continued) PACKAGE OUTLINE, 12, 16, 20, 24, 28L THIN QFN, 4x4x0.8mm ...
Page 19
... I C Port Expander with 12 Push-Pull (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.) ______________________________________________________________________________________ Outputs and 4 Open-Drain I/Os Package Information (continued) PACKAGE OUTLINE, QSOP .150", .025" LEAD PITCH ...
Page 20
... I C Port Expander with 12 Push-Pull Outputs and 4 Open-Drain I/Os (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.) 20 ______________________________________________________________________________________ Package Information (continued) ...
Page 21
... For the latest package outline information www.maxim-ic.com/packages.) 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. ...