Specification	25CS640T-E/Q4B

Access Time	20 ns
Clock Frequency	20 MHz
Memory Format	EEPROM
Memory Interface	SPI
Memory Organization	8 K
Memory Size	64 Kbit
Memory Type	Non-Volatile
Mounting Type	Surface Mount
Operating Temperature [Max]	125 °C
Operating Temperature [Min]	-40 °C
Package / Case	8-UFDFN Exposed Pad
Supplier Device Package	8-UDFN (2x3)
Technology	EEPROM
Voltage - Supply [Max]	5.5 V
Voltage - Supply [Min]	1.8 V
Write Cycle Time - Word, Page	4 ms

25CS640 Series

with ECC, 128-Bit Serial Number and Enhanced Write Protection

Part	Voltage - Supply [Min]	Voltage - Supply [Max]	Memory Type	Memory Format	Write Cycle Time - Word, Page	Access Time	Clock Frequency	Memory Interface	Operating Temperature [Min]	Operating Temperature [Max]	Technology	Memory Organization	Memory Size	Supplier Device Package	Package / Case	Mounting Type	Package / Case [y]	Package / Case [x]
Microchip Technology 25CS640T-E/MWF36KVAO	1.8 V	5.5 V	Non-Volatile	EEPROM	4 ms	20 ns	20 MHz	SPI	-40 °C	125 °C	EEPROM	8 K	64 Kbit
Microchip Technology 25CS640T-E/Q4B	1.8 V	5.5 V	Non-Volatile	EEPROM	4 ms	20 ns	20 MHz	SPI	-40 °C	125 °C	EEPROM	8 K	64 Kbit	8-UDFN (2x3)	8-UFDFN Exposed Pad	Surface Mount
Microchip Technology 25CS640-H/SN	2.5 V	5.5 V	Non-Volatile	EEPROM	4 ms	40 ns	10 MHz	SPI	-40 °C	150 °C	EEPROM	8 K	64 Kbit	8-SOIC	8-SOIC	Surface Mount	3.9 mm	0.154 in
Microchip Technology 25CS640T-I/Q4B	1.7 V	5.5 V	Non-Volatile	EEPROM	4 ms	20 ns	20 MHz	SPI	-40 °C	85 °C	EEPROM	8 K	64 Kbit	8-UDFN (2x3)	8-UFDFN Exposed Pad	Surface Mount

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Microchip Direct	T/R	1	$ 0.76
		25	$ 0.73
		100	$ 0.70
		1000	$ 0.67
		5000	$ 0.63
		10000	$ 0.59

Description

General part information

25CS640 Series

The 25CS640 is a 64 Kbit (8 Kbytes) Serial EEPROM utilizing the industry standard Serial Peripheral Interface (SPI) compatible serial bus.

Microchip's 25CS SPI Serial EEPROM Family offers additional features such as Built-in Error Correction Code (ECC) logic, Undervoltage Lockout (UVLO) detection, 128-bit Serial Number and Enhanced Write Protection to optimized for use in consumer electronics, industrial, medical, and automotive applications where reliable and dependable nonvolatile memory storage is essential. The EEPROM is available in a variety of space-saving packaging options.

Documents

Technical documentation and resources

Datasheet

AN3451 - Enhanced Write Protection for SPI EEPROM Devices

Application Notes

AN3377 - Using the Undervoltage Lockout Feature on SPI Serial EEPROMs

Application Notes