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PDF 24LC21-SN Data sheet ( Hoja de datos )

Número de pieza 24LC21-SN
Descripción 1K2.5VDualModeI2CSerialEEPROM
Fabricantes MicrochipTechnology 
Logotipo MicrochipTechnology Logotipo



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No Preview Available ! 24LC21-SN Hoja de datos, Descripción, Manual

24LC21
1K 2.5V Dual Mode I2CSerial EEPROM
FEATURES
• Single supply with operation down to 2.5V
• Completely implements DDC1/DDC2inter-
face for monitor identification
• Low power CMOS technology
- 1 mA active current typical
- 10 µA standby current typical at 5.5V
• 2-wire serial interface bus, I2Ccompatible
• Self-timed write cycle (including auto-erase)
• Page-write buffer for up to 8 bytes
• 100 kHz (2.5V) and 400 kHz (5V) compatibility
• Factory programming (QTP) available
• 1,000,000 erase/write cycles guaranteed
• Data retention > 200 years
• 8-pin PDIP and SOIC package
• Available for extended temperature ranges
- Commercial (C):
- Industrial (I):
0˚C to +70˚C
-40˚C to +85˚C
DESCRIPTION
The Microchip Technology Inc. 24LC21 is a 128 x 8 bit
Electrically Erasable PROM. This device is designed for
use in applications requiring storage and serial trans-
mission of configuration and control information. Two
modes of operation have been implemented: 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 entire memory array contents,
clocked by the VCLK pin. A valid high to low transition
on the SCL pin will cause the device to enter the
Bi-Directional Mode, with byte selectable read/write
capability of the memory array. The 24LC21 is available
in a standard 8-pin PDIP and SOIC package in both
commercial and industrial temperature ranges.
PACKAGE TYPES
PDIP
NC 1
NC 2
NC 3
VSS 4
SOIC
NC 1
NC 2
NC 3
VSS
4
8 VCC
7 VCLK
6 SCL
5 SDA
8 VCC
7 VCLK
5 SCL
5 SDA
BLOCK DIAGRAM
VCLK
HV GENERATOR
I/O
CONTROL
LOGIC
MEMORY
CONTROL
LOGIC
XDEC
SDA SCL
EEPROM
ARRAY
PAGE LATCHES
YDEC
VCC SENSE AMP
VSS R/W CONTROL
DDC is a trademark of the Video Electronics StandarDs Association.
I2C is a trademark of Philips Corporation.
© 1996 Microchip Technology Inc.
This document was created with FrameMaker 4 0 4
DS21095F-page 1

1 page




24LC21-SN pdf
3.0 BI-DIRECTIONAL MODE
The 24LC21 can be switched into the Bi-Directional
Mode (see Figure 3-1) by applying a valid high to low
transition on the Bi-Directional Mode Clock (SCL).
When the device has been switched into the Bi-Direc-
tional Mode, the VCLK input is disregarded, with the
exception that a logic high level is required to enable
write capability. This mode supports a two wire bi-direc-
tional data transmission protocol. In this protocol, a
device that sends data on the bus is defined to be the
transmitter, and a device that receives data from the
bus is defined to be the receiver. The bus must be con-
trolled by a master device that generates the Bi-Direc-
tional Mode Clock (SCL), controls access to the bus
and generates the START and STOP conditions, while
the 24LC21 acts as the slave. Both master and slave
can operate as transmitter or receiver, but the master
device determines which mode is activated.
24LC21
3.1 Bi-Directional Mode Bus
Characteristics
The following bus protocol has been defined:
• Data transfer may be initiated only when the bus is
not busy.
• During data transfer, the data line must remain
stable whenever the clock line is HIGH. Changes
in the data line while the clock line is HIGH will be
interpreted as a START or STOP condition.
Accordingly, the following bus conditions have been
defined (see Figure 3-2).
3.1.1 BUS NOT BUSY (A)
Both data and clock lines remain HIGH.
3.1.2 START DATA TRANSFER (B)
A HIGH to LOW transition of the SDA line while the
clock (SCL) is HIGH determines a START condition. All
commands must be preceded by a START condition.
3.1.3 STOP DATA TRANSFER (C)
A LOW to HIGH transition of the SDA line while the
clock (SCL) is HIGH determines a STOP condition. All
operations must be ended with a STOP condition.
FIGURE 3-1: MODE TRANSITION
Transmit Only Mode
SCL
TVHZ
Bi-Directional Mode
SDA
VCLK
FIGURE 3-2: DATA TRANSFER SEQUENCE ON THE SERIAL BUS
VHYS
SCL
SDA
TSU:STA
THD:STA
TSU:STO
START
STOP
© 1996 Microchip Technology Inc.
DS21095F-page 5

5 Page





24LC21-SN arduino
24LC21
24LC21 Product Identification System
To order or to obtain information, e.g., on pricing or delivery, please use the listed part numbers, and refer to the factory or the listed
sales offices.
24LC21 -
/P
Package:
P = Plastic DIP (300 mil Body), 8-lead
SN = Plastic SOIC (150 mil Body), 8-lead
Temperature
Range:
Blank = 0˚C to +70˚C
I = -40˚C to +85˚C
Device:
24LC21
24LC21T
Dual Mode I2C Serial EEPROM
Dual Mode I2C Serial EEPROM (Tape and Reel)
© 1996 Microchip Technology Inc.
DS21095F-page 11

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