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24AA256/24LC256/24FC256
256K I 2 C ? CMOS Serial EEPROM
Device Selection Table
Part V CC Max. Clock
Number Range Frequency
Temp.
Ranges
? Temperature Ranges:
- Industrial (I):
- Automotive (E):
-40 ? C to +85 ? C
-40 ? C to +125 ? C
24AA256
24LC256
1.7-5.5V
2.5-5.5V
400 kHz (1)
400 kHz
I
I, E
Description:
The Microchip Technology Inc. 24AA256/24LC256/
24FC256
Note 1:
2:
1.7-5.5V 1 MHz (2)
100 kHz for V CC < 2.5V.
400 kHz for V CC < 2.5V.
I
24FC256 (24XX256*) is a 32K x 8 (256 Kbit) Serial
Electrically Erasable PROM, capable of operation
across a broad voltage range (1.7V to 5.5V). It has
been developed for advanced, low-power applications
Features:
? Single Supply with Operation down to 1.7V for
24AA256 and 24FC256 Devices, 2.5V for
24LC256 Devices
? Low-Power CMOS Technology:
- Active current 400 uA, typical
- Standby current 100 nA, typical
? 2-Wire Serial Interface, I 2 C ? Compatible
? Cascadable up to Eight Devices
? Schmitt Trigger Inputs for Noise Suppression
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,
SOIC, TSSOP, MSOP and DFN packages. The
24AA256 is also available in the 8-lead Chip Scale
package.
Block Diagram
? Output Slope Control to Eliminate Ground Bounce
? 100 kHz and 400 kHz Clock Compatibility
? Page Write Time 5 ms max.
A0 A1A2 WP
HV Generator
? Self-Timed Erase/Write Cycle
? 64-Byte Page Write Buffer
I/O
Control
Logic
Memory
Control
Logic
XDEC
EEPROM
Array
? Hardware Write-Protect
? ESD Protection >4000V
Page Latches
? More than 1 Million Erase/Write Cycles
I/O
SCL
? Data Retention >200 years
? Factory Programming Available
? Packages Include 8-lead PDIP, SOIC, DFN,
TSSOP and MSOP
SDA
V CC
YDEC
? Pb-Free and RoHS Compliant
Package Types
V SS
Sense Amp.
R/W Control
PDIP/SOIC
TSSOP/MSOP (1)
DFN
CS (Chip Scale) (2)
A0
A1
1
2
8
7
V CC
WP
A0
A1
1
2
8
7
V CC
WP
A0
A1
1
2
8 V CC
7 WP
WP
V CC A1 A0
1 2 3
4 5
A2
A2
3
6
SCL
A2
3
6
SCL
A2
3
6 SCL
6
7
8
V SS
4
5
SDA
V SS
4
5
SDA
V SS
4
5 SDA
SDA SCL V SS
(TOP DOWN VIEW,
BALLS NOT VISIBLE)
Note 1: * Pins A0 and A1 are no connects for the MSOP package only.
Note 2: Available in I-temp, “AA” only.
*24XX256 is used in this document as a generic part number for the 24AA256/24LC256/24FC256 devices.
? 1998-2011 Microchip Technology Inc.
DS21203R-page 1
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