addition, the entire family is available in 5.0V (4.5V to
5.5V), 2.7V (2.7V to 5.5V), and 1.8V (1.8V to 3.6V) ver-
sions.
The AT25HP256/512 is enabled through the Chip Select
pin (CS) and accessed via a 3-wire interface consisting of
Serial Data Input (SI), Serial Data Output (SO), and Serial
Clock (SCK). All programming cycles are completely self-
timed, and no separate ERASE cycle is required before
WRITE.
BLOCK WRITE protection is enabled by programming the
status register with top ¼, top ½ or entire array of write pro-
tection. Separate program enable and program disable
instructions are provided for additional data protection.
Hardware data protection is provided via the WP pin to pro-
tect against inadvertent write attempts to the status regis-
ter. The HOLD pin may be used to suspend any serial
communication without resetting the serial sequence.
Absolute Maximum Ratings*
Operating Temperature .................................. -55°C to +125°C
Storage Temperature ..................................... -65°C to +150°C
Voltage on Any Pin
with Respect to Ground .................................... -1.0V to +7.0V
Maximum Operating Voltage........................................... 6.25V
DC Output Current ........................................................ 5.0 mA
*NOTICE:
Stresses beyond those listed under “Absolute Maxi-
mum Ratings” may cause permanent damage to the
device. This is a stress rating only and functional
operation of the device at these or any other condi-
tions beyond those indicated in the operational sec-
tions of this specification is not implied. Exposure to
absolute maximum rating conditions for extended
periods may affect device reliability.
Block Diagram
32,768/65,536 x 8
2 AT25HP256/512
