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24LC21 参数 Datasheet PDF下载

24LC21图片预览
型号: 24LC21
PDF下载: 下载PDF文件 查看货源
内容描述: 1K 2.5V双模式I 2 C串行EEPROM [1K 2.5V Dual Mode I 2 C Serial EEPROM]
分类和应用: 可编程只读存储器电动程控只读存储器电可擦编程只读存储器
文件页数/大小: 16 页 / 110 K
品牌: MICROCHIP [ MICROCHIP TECHNOLOGY ]
 浏览型号24LC21的Datasheet PDF文件第2页浏览型号24LC21的Datasheet PDF文件第3页浏览型号24LC21的Datasheet PDF文件第4页浏览型号24LC21的Datasheet PDF文件第5页浏览型号24LC21的Datasheet PDF文件第6页浏览型号24LC21的Datasheet PDF文件第7页浏览型号24LC21的Datasheet PDF文件第8页浏览型号24LC21的Datasheet PDF文件第9页  
24LC21A
1K 2.5V Dual Mode I
2
C
Serial EEPROM
FEATURES
• Single supply with operation down to 2.5V
• Completely implements DDC1
/DDC2
interface for monitor identification, including recov-
ery to DDC1
• Pin and function compatible with 24LC21
• Low power CMOS technology
- 1 mA typical active current
- 10
µ
A standby current typical at 5.5V
• 2-wire serial interface bus, I
2
C
compatible
• 100 kHz (2.5V) and 400 kHz (5V) compatibility
• Self-timed write cycle (including auto-erase)
• Page-write buffer for up to eight bytes
• 10,000,000 erase/write cycles guaranteed
• Data retention > 200 years
• ESD Protection > 4000V
• 8-pin PDIP and SOIC package
• Available for extended temperature ranges
- Commercial (C):
0
°
C to +70
°
C
- Industrial (I):
-40
°
C to +85
°
C
PACKAGE TYPES
PDIP
NC
NC
NC
V
SS
SOIC
1
24LC21A
2
3
4
8
7
6
5
V
CC
VCLK
SCL
SDA
NC
NC
NC
V
SS
1
24LC21A
2
3
4
8
7
6
5
V
CC
VCLK
SCL
SDA
DESCRIPTION
The Microchip Technology Inc. 24LC21A is a 128 x 8-
bit dual-mode Electrically Erasable PROM. This device
is designed for use in applications requiring storage
and serial transmission of configuration and control
information. Two modes of operation have been imple-
mented: Transmit-Only Mode and Bi-directional Mode.
Upon power-up, the device will be in the Transmit-Only
Mode, sending a serial bit stream of the memory array
from 00h to 7Fh, clocked by the VCLK pin. A valid high
to low transition on the SCL pin will cause the device to
enter the transition mode, and look for a valid control
byte on the I
2
C bus. If it detects a valid control byte from
the master, it will switch into Bi-directional Mode, with
byte selectable read/write capability of the memory
array using SCL. If no control byte is received, the
device will revert to the Transmit-Only Mode after it
receives 128 consecutive VCLK pulses while the SCL
pin is idle. The 24LC21A is available in a standard 8-pin
PDIP and SOIC package in both commercial and
industrial temperature ranges.
BLOCK DIAGRAM
HV GENERATOR
I/O
CONTROL
LOGIC
MEMORY
CONTROL
LOGIC
XDEC
EEPROM
ARRAY
PAGE LATCHES
SDA
SCL
YDEC
VCLK
SENSE AMP
R/W CONTROL
V
CC
V
SS
DDC is a trademark of the Video Electronics Standards Association.
I
2
C is a trademark of Philips Corporation.
©
1996 Microchip Technology Inc.
Preliminary
This document was created with FrameMaker 4 0 4
DS21160B-page 1