24AA256 Datasheet, PDF (1/12 Pages) Microchip Technology – 256K I 2 C CMOS Serial EEPROM

M
24AA256/24LC256
256K I²C^™CMOS Serial EEPROM
DEVICE SELECTION TABLE
Part
Number
VCC
Range
Max Clock
Frequency
24AA256 1.8-5.5V 400 kHz^†
24LC256 2.5-5.5V 400 kHz^‡
† _{100 kHz for VCC < 2.5V.}
‡ _{100 kHz for E temperature range.}
Temp
Ranges
I
I, E
FEATURES
• Low power CMOS technology
- Maximum write current 3 mA at 5.5V
- Maximum read current 400 µA at 5.5V
- Standby current 100 nA typical at 5.5V
• 2-wire serial interface bus, I²C compatible
• Cascadable for up to eight devices
• Self-timed ERASE/WRITE cycle
• 64-byte page-write mode available
• 5 ms max write-cycle time
• Hardware write protect for entire array
• Schmitt trigger inputs for noise suppression
• 100,000 erase/write cycles guaranteed
• Electrostatic discharge protection > 4000V
• Data retention > 200 years
• 8-pin PDIP and SOIC (208 mil) packages
• Temperature ranges:
- Industrial (I):
-40°C to +85°C
- Automotive (E):
-40°C to +125°C
DESCRIPTION
The Microchip Technology Inc. 24AA256/24LC256
(24xx256*) is a 32K x 8 (256K bit) Serial Electrically
Erasable PROM, capable of operation across a broad
voltage range (1.8V to 5.5V). It has been developed for
advanced, low power applications such as personal
communications or data acquisition. This device also
has a page-write capability of up to 64 bytes of data.
This device is capable of both random and sequential
reads up to the 256K boundary. Functional address
lines allow up to eight devices on the same bus, for up
to 2 Mbit address space. This device is available in the
standard 8-pin plastic DIP, and 8-pin SOIC (208 mil)
packages.
PACKAGE TYPE
PDIP
A0 1
A1 2
A2 3
Vss 4
SOIC
A0
1
A1
2
A2
3
VSS
4
8 Vcc
7 WP
6 SCL
5 SDA
8
VCC
7
WP
6
SCL
5
SDA
BLOCK DIAGRAM
A0…A2 WP
HV GENERATOR
I/O
CONTROL
LOGIC
MEMORY
CONTROL
LOGIC
I/O _SCL
SDA
VCC
VSS
XDEC
EEPROM
ARRAY
PAGE LATCHES
YDEC
SENSE AMP
R/W CONTROL
I²C is a trademark of Philips Corporation.
*24xx256 is used in this document as a generic part number for the 24AA256/24LC256 devices.
© 1998 Microchip Technology Inc.
DS21203C-page 1