HT24LC256 Datasheet, PDF (1/12 Pages) Holtek Semiconductor Inc – CMOS 256K 2-Wire Serial EEPROM

HT24LC256
CMOS 256K 2-Wire Serial EEPROM
Features
• Operating voltage:
2.2V~5.5V for Ta=-40˚C to +85˚C
• Memory Capacity: 256K (32K×8)
• 2-wire I²C serial interface
• Write cycle time: 5ms max.
• Automatic erase-before-write operation
• Partial page write allowed
• 64-byte Page write modes
• Write operation with built-in timer
• Hardware controlled write protection
• 40-year data retention
• 10⁶ erase/write cycles per word
• 8-pin DIP/SOP/TSSOP package
Block Diagram
SCL
SDA
WP
A 0~A 2
VCC
VSS
I/O
C o n tro l
L o g ic
M e m o ry
C o n tro l
L o g ic
A d d re s s
C o u n te r
H V P um p
X
D _{EEPRO M}
E
A rra y
C
P a g e B u ffe r
YDEC
S ense A M P
R /W C o n tro l
Description
The HT24LC256 device is a 256K-bit 2-wire serial
read/write non-volatile memory device manufactured
using a CMOS floating gate process. Its 256K bits of
memory are organized into 32K words and each word
is 8 bits. The device is optimized for use in many
industrial and commercial applications where low
power and low voltage operation are essential. Up to
eight HT24LC256 devices may be connected to the
same two-wire bus. The HT24LC256 is guaranteed
for 1M erase/write cycles and 40-year data retention.
Pin Assignment
A0 1
A1 2
A2 3
VSS 4
8 VCC
7 WP
6 SCL
5 SDA
H_HT_T22 ₄4 _LL _CC ₂2 ₅5 ₆6
8 DIP⁸ -A^D /S^{I P} O^- P^A -^/ A^S /^O TS^P S^{- A} OP-A
Pin Description
Pin Name Type
Description
A0~A2
SDA
SCL
WP
VSS
VCC
I
I/O
I
I
PWR
PWR
Address inputs
Serial data
Serial clock input
Write protect
Negative power supply, ground
Positive power supply
Rev. 1.00
1
January 29, 2013