Key facts
- Brand
- Maxim
- Model
- I2C
- Industry
- Industrial
- Documents
- 4
- Languages
- EN
- Last added
- 2012-05-08
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Maxim MAX7321 I2C Port Expander Datasheet
The MAX7321 is a general‑purpose I2C port expander that provides eight open‑drain I/O pins. Each pin can be used as a logic input or an open‑drain output, supports 20 mA sink current, and is over‑voltage protected to +6 V. The device includes transition‑detection logic that latches input changes and signals them via an INT output.
The part operates from a 1.71 V to 5.5 V supply, supports up to 400 kHz I2C clock frequency, and is qualified for the automotive temperature range of –40 °C to +125 °C. It offers 16‑pin QSOP and TQFN packages, with a total sink capability of 100 mA across all ports and a typical standby current of 0.6 µA.
Maxim I2C specifications
| Operating Supply Voltage (V+) | 1.71 V to 5.5 V |
|---|---|
| I2C Serial Clock Frequency | 400 kHz |
| Number of Open‑Drain I/O Ports | 8 |
| Sink Current per Port | 20 mA |
| Total Sink Current (all ports) | 100 mA |
| Over‑Voltage Protection | +6 V |
| Operating Temperature Range | -40 °C to +125 °C |
| Standby Current (typical) | 0.6 µA |
All Maxim I2C documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What is the maximum I2C clock frequency for the MAX7321?
The MAX7321 supports an I2C serial clock frequency up to 400 kHz.
How many I/O ports does the MAX7321 provide?
The device provides eight open‑drain I/O ports.
How many push‑pull output ports does the MAX7322 provide?
The device provides four push‑pull output ports, each capable of sinking 20 mA.
From: Maxim Integrated MAX7322 I2C Port Expander with 4 Push‑Pull Outputs and 4 Inputs Datasheet
What is the maximum I2C clock speed for the MAX7322?
The I2C serial interface operates up to 400 kHz.
From: Maxim Integrated MAX7322 I2C Port Expander with 4 Push‑Pull Outputs and 4 Inputs Datasheet
What I2C slave address range does the MAX7328 use?
The MAX7328 uses a slave ID range of 0x20 to 0x27.
From: Maxim MAX7328/MAX7329 I2C Port Expanders with Eight I/O Ports Datasheet
What I2C slave address range does the MAX7329 use?
The MAX7329 uses a slave ID range of 0x38 to 0x3F.
From: Maxim MAX7328/MAX7329 I2C Port Expanders with Eight I/O Ports Datasheet