
1
Features
Serial Peripheral Interface (SPI) Compatible
Supports SPI Modes 0 (0,0) and 3 (1,1)
128-byte Page Mode Only for Write Operations
Low-voltage and Standard-voltage Operation
– 2.7 (V
CC
= 2.7V to 5.5V)
– 1.8 (V
CC
= 1.8V to 5.5V)
10 MHz (5V), 5MHz (2.7V) and 2 MHz (1.8V) Clock Rate
Block Write Protection
Protect 1/4, 1/2, or Entire Array
Write Protect (WP) Pin and Write Disable Instructions for
both Hardware and Software Data Protection
High Reliability
– Endurance: 100K Write Cycles
– Data Retention: >40 Years
8-lead PDIP, 8-lead EIAJ SOIC, 16-lead JEDEC SOIC and 8-lead Leadless Array Package
Description
The AT25HP256/512 provides 262,144/524,288 bits of serial electrically erasable pro-
grammable read only memory (EEPROM) organized as 32,768/65,536 words of 8-bits
each. The device is optimized for use in many industrial and commercial applications
where high-speed, low-power, and low-voltage operation are essential. The
AT25HP256/512 is available in a space saving 8-lead PDIP (AT25HP256/512), 8-lead
EIAJ SOIC (AT25HP256), 16-lead JEDEC SOIC (AT25HP512) and 8-lead Leadless
Rev. 1113G–SEEPR–08/02
SPI Serial
EEPROMs
256K (32,768 x 8)
512K (65,536 x 8)
AT25HP256
AT25HP512
Pin Configurations
Pin Name
Function
CS
Chip Select
SCK
Serial Data Clock
SI
Serial Data Input
SO
Serial Data Output
GND
Ground
VCC
Power Supply
WP
Write Protect
HOLD
Suspends Serial Input
(continued)
8-lead SOIC
CS
SCK
SI
SO
WP
GND
HOLD
VCC
1
2
3
4
8
7
6
5
8-lead PDIP
CS
SCK
SI
SO
WP
GND
HOLD
VCC
1
2
3
4
8
7
6
5
8-lead Leadless Array
Bottom View
1
2
3
4
8
7
6
5
VCC
HOLD
SCK
SI
CS
SO
WP
GND
16-lead SOIC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
CS
SO
NC
NC
NC
NC
WP
GND
VCC
HOLD
NC
NC
NC
NC
SCK
SI