25LC640 64K SPI Bus Serial EEPROM: Pinout, Equivalent and Datasheet

The following figure is the diagram of 25LC640 pinout.

Pinout

The followings are 25LC640 Symbol, Footprint, and 3D Model.

PCB Symbol

PCB Footprint

3D Model

The Microchip Technology Inc. 25LC640 is a 64 Kbit Serial Electrically Erasable PROM [EEPROM]. The memory is accessed via a simple Serial Peripheral Interface (SPI) compatible serial bus. The bus signals required are a clock input (SCK) plus separate data in (SI) and data out (SO) lines. Access to the device is controlled through a Chip Select (CS) input. Communication to the device can be paused via the hold pin. While the device is paused, transitions on its inputs will be ignored, with the exception of Chip Select, allowing the host to service higher priority interrupts. The 25LC640 is a 8192 byte Serial EEPROM designed to interface directly with the Serial Peripheral Interface (SPI) port of many of today’s popular microcontroller families, including Microchip’s PIC16C6X/7X microcontrollers.

This article provides you with a basic overview of the 25LC640 64K SPI Bus Serial EEPROM, including its pin descriptions, features and specifications, etc., to help you quickly understand what 25LC640 is.

● Low-Power CMOS Technology

   ◆ Write current: 3 mA, typical

   ◆ Read current: 500 μA, typical

   ◆ Standby current: 500 nA, typical

● 8192 x 8 Bit Organization

● 32 Byte Page

● Write Cycle Time: 5 ms max.

● Self-Timed Erase and Write Cycles

● Block Write Protection

   ◆ Protect none, 1/4, 1/2 or all of array

● Built-in Write Protection

   ◆ Power on/off data protection circuitry

   ◆ Write enable latch

   ◆ Write-protect pin

● Sequential Read

● High Reliability

   ◆ Data retention: > 200 years

   ◆ ESD protection: > 4000V

● Temperature Ranges Supported:

   ◆ Industrial (I): -40°C to +85°C

   ◆ Automotive (E): -40°C to +125°C

Microchip Technology 25LC640-I/SN technical specifications, attributes, parameters and parts with similar specifications to Microchip Technology 25LC640-I/SN.

The following is the Block Diagram of 25LC640.

Block Diagram

The following is the Package Marking Information of 25LC640.

8-Lead SOIC (150 mil)

Example

The following diagram shows the 25LC640 Recommended Land Pattern.

Recommended Land Pattern

Microchip Technology Inc. is a leading provider of microcontroller and analog semiconductors, providing low-risk product development, lower total system cost and faster time to market for thousands of diverse customer applications worldwide. Headquartered in Chandler, Arizona, Microchip offers outstanding technical support along with dependable delivery and quality.