25LC040-I/P

Overview

The Microchip Technology 25LC040-I/P is a 4 Kbit (512 x 8-bit) serial Electrically Erasable PROM. It operates within a voltage range of 2.5V to 5.5V and supports a maximum clock frequency of 2 MHz. The device utilizes a Serial Peripheral Interface (SPI) compatible bus for communication, featuring separate data input (SI) and output (SO) lines synchronized by a clock input (SCK). Access is controlled via the Chip Select (CS) pin, while the Hold (HOLD) pin allows pausing transmission without resetting the sequence. The component is housed in an 8-lead Plastic Dual In-line Package (PDIP) designed for through-hole mounting.

Feature Summary

• Supports self-timed erase and write cycles with a maximum cycle time of 5 ms.
• Includes hardware write protection via the WP pin and software block protection for none, 1/4, 1/2, or all of the array.
• Features built-in power on/off data protection circuitry and a write enable latch to prevent inadvertent writes.
• Allows serial communication to be paused via the HOLD pin to service higher priority interrupts.

Applications

• Interfacing directly with microcontroller families such as Microchip PIC16C6X/7X via SPI ports.
• Data acquisition systems requiring non-volatile storage for configuration parameters.
• Personal communications devices utilizing low-power CMOS technology.
• Applications requiring high reliability with over 1 million write/erase cycles endurance.

Procurement Notes

Verify that the specific ordering suffix matches the required package type, temperature range, and voltage specifications. Confirm RoHS compliance status if environmental regulations apply to the target assembly. Ensure the design accommodates the 8-pin PDIP footprint dimensions and lead pitch. Check for any recent Product Change Notifications regarding packaging or material updates from the manufacturer.

Selection Notes

Select this component when a 4 Kbit capacity is sufficient and a 2.5V minimum supply voltage is acceptable. The Industrial temperature range (-40°C to +85°C) suits standard commercial and industrial environments. Consider alternative packages like SOIC or TSSOP if surface-mount technology is preferred over through-hole installation. Verify that the system SPI interface can support the required clock frequencies and hold signal timing.

Part Context

This device belongs to the 25XX040 family of 4 Kbit serial EEPROMs, which also includes the 25AA040 and 25C040 variants. These parts share identical functional architectures but differ in operating voltage ranges and supported temperature grades. The datasheet notes that this specific generation is not recommended for new designs, suggesting the use of updated A-series equivalents like the 25LC040A for future projects.

Replacement Considerations

Public confirmed substitute part numbers: 25LC040A-I/P