CAT25256
256-Kb SPI Serial CMOS
EEPROM
Description
The CAT25256 is a 256−Kb Serial CMOS EEPROM device
internally organized as 32Kx8 bits. This features a 64−byte page write
buffer and supports the Serial Peripheral Interface (SPI) protocol. The
device is enabled through a Chip Select (CS) input. In addition, the
required bus signals are clock input (SCK), data input (SI) and data
output (SO) lines. The HOLD input may be used to pause any serial
communication with the CAT25256 device. The device features
software and hardware write protection, including partial as well as
full array protection.
http://onsemi.com
SOIC−8
V SUFFIX
CASE 751BD
UDFN−8
HU4 SUFFIX
CASE 517AZ
SOIC−8
X SUFFIX
CASE 751BE
On−Chip ECC (Error Correction Code) makes the device suitable
for high reliability applications.*
Features
• 20 MHz (5 V) SPI Compatible
• 1.8 V to 5.5 V Supply Voltage Range
• SPI Modes (0,0) & (1,1)
PDIP−8
L SUFFIX
CASE 646AA
TSSOP−8
Y SUFFIX
CASE 948AL
TDFN−8**
ZD2 SUFFIX
CASE 511AM
• 64−byte Page Write Buffer
PIN CONFIGURATIONS
• Additional Identification Page with Permanent Write Protection
(New Product)
1
V
CC
CS
SO
HOLD
• Self−timed Write Cycle
WP
SCK
V
SS
SI
• Hardware and Software Protection
• Block Write Protection
PDIP (L), SOIC (V, X), TSSOP (Y),
UDFN (HU4), TDFN** (ZD2)
− Protect 1/4, 1/2 or Entire EEPROM Array
• Low Power CMOS Technology
• 1,000,000 Program/Erase Cycles
(Top View)
** Not recommended for new designs.
• 100 Year Data Retention
• Industrial and Extended Temperature Range
• 8−lead PDIP, SOIC, TSSOP and 8−pad UDFN and TDFN Packages
PIN FUNCTION
†
Pin Name
Function
Chip Select
• This Device is Pb−Free, Halogen Free/BFR Free, and RoHS
CS
SO
WP
Compliant
Serial Data Output
Write Protect
V
CC
V
SS
Ground
SI
SI
Serial Data Input
Serial Clock
CS
SCK
SO
CAT25256
WP
HOLD
Hold Transmission Input
Power Supply
HOLD
SCK
V
CC
†The exposed pad for the TDFN/UDFN packages can
be left floating or connected to Ground.
V
SS
Figure 1. Functional Symbol
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 20 of this data sheet.
* Available for New Product (Rev. E)
© Semiconductor Components Industries, LLC, 2012
1
Publication Order Number:
September, 2012 − Rev. 7
CAT25256/D