11AA161-I/P

Overview

The Microchip Technology 11AA161-I/P is a 16 Kbit (2,048 x 8) serial electrically erasable PROM featuring the UNI/O single I/O bus interface. It operates within a supply voltage range of 1.8V to 5.5V and supports an industrial temperature range of -40°C to +85°C. The device utilizes Manchester encoding on the SCIO pin for combined clock and data transmission. Key electrical characteristics include a typical active current of 1 mA and a maximum standby current of 1 µA. It offers high reliability with 1,000,000 erase/write cycle endurance and greater than 200 years of data retention.

Feature Summary

• Supports the patented UNI/O single I/O serial bus protocol using Manchester encoding on the SCIO pin.
• Includes built-in write protection mechanisms such as power-on/off data protection and a write enable latch.
• Features block write protection allowing configuration to protect none, 1/4, 1/2, or all of the memory array.
• Provides Schmitt trigger inputs for noise suppression and output slope control to eliminate ground bounce.

Applications

• Interfacing with microcontrollers via a discrete I/O line configured for the UNI/O protocol
• Data storage in ASICs requiring low-pin-count serial memory solutions
• Embedded systems needing non-volatile memory with hardware-level write protection

Procurement Notes

Verify that the specific part number suffix corresponds to the PDIP package type. Confirm the 'I' designation indicates the Industrial temperature range (-40°C to +85°C). Ensure the '1' in the model number matches the required hardwired device address code '0001' for bus allocation compatibility.

Selection Notes

Select this component when a single-wire serial interface is required to minimize pin count. Choose the 11AA161 variant over the 11AA160 if the system design requires the specific device address code '0001' to avoid conflicts with other devices on the same bus. Verify that the host controller can generate the necessary Manchester encoded signals.

Part Context

This device belongs to the 11XX family of 1 Kbit through 16 Kbit Serial Electrically Erasable PROMs. The family supports various organizations from 128x8 to 2048x8 bits. The 11AA series specifically denotes low-voltage operation down to 1.8V, distinguishing it from the 11LC series which typically starts at 2.5V.

Replacement Considerations

The 11AA160-I/P is a functional substitute within the same family but uses a different hardwired device address ('0000'). Substitution requires verifying that the address conflict does not impact the system bus architecture.

FAQ

What is the function of the SCIO pin?

The SCIO pin serves as the single bidirectional serial clock and data input/output line for the UNI/O bus interface.

How is the device address determined for the 11AA161?

The device address is hardwired internally. For the 11AA161, the last four bits of the address byte are set to '0001', resulting in a full address of 1010 0001.

What happens if a page write crosses a physical page boundary?

If a page write attempts to cross a boundary, the internal address counter rolls over to the beginning of the current page, causing the new data to overwrite existing data in that page rather than writing to the next page.