Rainbow Electronics AT25256A - Manual (Page 2)

2
AT25128A/256A [Preliminary]
3404A–SEEPR–10/03
The AT25128A/256A 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 protec-
tion. Separate program enable and program disable instructions are provided for additional data protection. Hardware data
protection is provided via the WP pin to protect against inadvertent write attempts to the status register. The HOLD pin may
be used to suspend any serial communication without resetting the serial sequence.
Block Diagram
Absolute Maximum Ratings*
Operating Temperature .................................. -55
°
C to +125
°
C *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.
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
16384/32768 x 8