24lcs51 Microchip Technology Inc., 24lcs51 Datasheet

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24lcs51

Manufacturer Part Number
24lcs51
Description
1k/2k Software Addressable I 2 C? Serial Eeprom
Manufacturer
Microchip Technology Inc.
Datasheet
Device Selection Table
Features
• Low-power CMOS technology
• Software addressability allows up to 255 devices
• 2-wire serial interface bus, I
• Automatic bus arbitration
• Wakes up to control code 0110
• General purpose output pin can be used to enable
• 100 kHz and 400 kHz compatibility
• Page write buffer for up to 16 bytes
• 10 ms max write cycle time for byte or page write
• 1,000,000 erase/write cycles
• 8-pin PDIP, SOIC or TSSOP packages
• Temperature ranges supported:
Description
The Microchip Technology Inc. 24LCS61/62 is a 1K/2K
bit Serial EEPROM developed for applications that
require many devices on the same bus but do not have
the I/O pins required to address each one individually.
These devices contain an 8 bit address register that is
set upon power-up and allows the connection of up to
255 devices on the same bus. When the process of
assigning ID values to each device is in progress, the
device will automatically handle bus arbitration if more
than one device is operating on the bus. In addition, an
external open drain output pin is available that can be
used to enable other circuitry associated with each
individual
operation with typical standby and active currents of
only 10 A and 1 mA respectively. The device has a
page write capability for up to 16 bytes of data. The
device is available in the standard 8-pin PDIP, SOIC
(150 mil), and TSSOP packages.
I
 2004 Microchip Technology Inc.
2
C is a trademark of Philips Corporation.
24LCS51
24LCS62
- 1 mA active current typical
- 10 A standby current typical at 5.5V
on the same bus
other circuitry
- Industrial (I):
Device
1K/2K Software Addressable I
system.
1K bits
2K bits
Array
Size
Low
2.5V-5.5V
2.5V-5.5V
Voltage
Range
-40°C to +85°C
current
2
C compatible
Software Write
design permits
24LCS61/24LCS62
Entire Array
Protection
Lower Half
Package Types
Block Diagram
Pin Function Table
SOIC
TSSOP
V
PDIP
V
SDA SCL
CC
SS
2
Control
EDS
Logic
C
I/O
Name
SDA
EDS
SCL
V
V
NC
CC
SS
EDS
EDS
EDS
V
Vss
Vss
NC
NC
NC
NC
Obsolete Device
NC
NC
SS
Serial EEPROM
Memory
Control
Logic
1
2
3
4
1
2
3
4
Ground
Serial Data
Serial Clock
+2.5V to 5.5V Power Supply
No Internal Connection
External Device Select Output
1
2
3
4
XDEC
Function
8
7
6
5
8
7
6
5
8
7
6
5
Sense Amp.
R/W Control
HV Generator
DS21226E-page 1
Serial Number
ID Register
Vcc
NC
SCL
SDA
V
NC
SCL
SDA
EEPROM
CC
YDEC
Vcc
NC
SCL
SDA
Array

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24lcs51 Summary of contents

Page 1

... Software Addressable I Device Selection Table Array Voltage Device Size Range 24LCS51 1K bits 2.5V-5.5V 24LCS62 2K bits 2.5V-5.5V Features • Low-power CMOS technology - 1 mA active current typical - 10 A standby current typical at 5.5V • Software addressability allows up to 255 devices on the same bus 2 • 2-wire serial interface bus compatible • ...

Page 2

... CC I — 50 CCS +1. Conditions Vss or Vcc Vss or Vcc OUT V = 5.0V (Note 25° MHz 5. 5.5V, SCL = 400 kHz 5.5V, SDA = SCL = EDS = V CC  2004 Microchip Technology Inc. ...

Page 3

... Total Endurance™ Model which can be obtained from our web site. FIGURE 1-1: BUS TIMING DATA T F SCL Tsu:sta T LOW SDA STA SDA OUT  2004 Microchip Technology Inc. 24LCS61/24LCS62 Vcc = +2.5V to 5.5V Industrial (I -40°C to +85° 2.5V - 5.5V Vcc = 4.5V - 5.5V CC STD MODE FAST MODE Min. Max. Min. Max. — 100 — ...

Page 4

... When an overwrite does occur it will replace data in a first in first out fashion. (D) (D) DATA OR DATA ACKNOWLEDGE ALLOWED VALID TO CHANGE (C) (A) STOP CONDITION  2004 Microchip Technology Inc. ...

Page 5

... Transmitter must release the SDA line at this point allowing the Receiver to pull the SDA line low to acknowledge the previous eight bits of data.  2004 Microchip Technology Inc. 24LCS61/24LCS62 The device that acknowledges has to pull down the SDA line during the Acknowledge clock pulse in such a way that the SDA line is stable low during the high period of the acknowledge related clock pulse ...

Page 6

... Set Write Protection Fuse Read 14 different Write (Byte or Page) Assign Address Clear Address CONTROL BYTE FORMAT Command Select Bits ACK Acknowledge Bit COMMAND CODES Command Select Bits (C2 C1 C0) 000 001 010 100 110  2004 Microchip Technology Inc. ...

Page 7

...  2004 Microchip Technology Inc. 24LCS61/24LCS62 The 24LCS61/62 must acknowledge the control byte and the device ID byte, and the master must acknowl- edge each byte of the serial number transmitted by the device. As each bit is clocked out, each device will monitor the bus to detect if another device is also transmitting. If any device is outputting a logic ‘ ...

Page 8

... Power Off Clear Address Command Unassigned State (ID byte not assigned yet) Assign Address Command: Device wins Arbitration Assign Address Command: Device loses Arbitration Assigned State (ID byte has been assigned)  2004 Microchip Technology Inc. ...

Page 9

... ID byte set to xxh edge any further bytes and will not (other than 00h) respond to the command.  2004 Microchip Technology Inc. 24LCS61/24LCS62 Result if Device Has Already Been Assigned an ID Byte Device will not acknowledge command. ...

Page 10

... Set Write Protection Command The Set Write Protection command allows the user to write-protect a portion of the array. For the 24LCS51 this command will write-protect the entire array. For the 24LCS62 this command will protect the lower half of the array. This command is illustrated in Figure 6-3. ...

Page 11

... C K FIGURE 6-3: SET WRITE PROTECTION COMMAND CONTROL R BYTE  2004 Microchip Technology Inc. 24LCS61/24LCS62 DEVICE ADDRESS DATA BYTE 0 ID BYTE BYTE ADDRESS DEVICE BYTE ID BYTE ...

Page 12

... See Figure 7-1 for flow diagram. DS21226E-page 12 FIGURE 7-1: ACKNOWLEDGE POLLING FLOW Send Write Command Send Stop Condition to Initiate Write Cycle Send Start Send Control byte and Device ID byte Did Device Acknowledge Device ID (ACK = 0)? YES Next Operation  2004 Microchip Technology Inc. NO ...

Page 13

... This address pointer allows the entire memory contents to be serially read during one operation. The internal address pointer will automatically roll over from address 7Fh (24LCS51) or FFh (24LCS62) to address 00h DEVICE CONTROL ...

Page 14

... DATA n DATA DATA DATA DEVICE S T BYTE ID BYTE DATA  2004 Microchip Technology Inc. ...

Page 15

... OE bit was set to a one in the control byte. If the OE bit is a zero and the previous command asserted it, then the EDS pin will be released by the device at this point.  2004 Microchip Technology Inc. 24LCS61/24LCS62 standard Read or Write commands, the EDS pin will pull low (providing that the OE bit is set high) on the ris- ing clock edge after the ack bit following the ID byte ...

Page 16

... APPENDIX A: REVISION HISTORY Revision D Corrections to Section 1.0, Electrical Characteristics. Revision E Add “Obsolete Device” to document header. DS21226E-page 16  2004 Microchip Technology Inc. ...

Page 17

... Links to other useful web sites related to Microchip Products • Conferences for products, Development Systems, technical information and more • Listing of seminars and events  2004 Microchip Technology Inc. 24LCS61/24LCS62 SYSTEMS INFORMATION AND UPGRADE HOT LINE The Systems Information and Upgrade Line provides system users a listing of the latest versions of all of Microchip's development systems software products ...

Page 18

... What deletions from the document could be made without affecting the overall usefulness there any incorrect or misleading information (what and where)? 7. How would you improve this document? DS21226E-page 18 Total Pages Sent ________ FAX: (______) _________ - _________ N Literature Number: DS21226E  2004 Microchip Technology Inc. ...

Page 19

... The Microchip Worldwide Site (www.microchip.com) Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using. New Customer Notification System Register on our web site (www.microchip.com/cn) to receive the most current information on our products.  2004 Microchip Technology Inc. 24LCS61/24LCS62 XXX Pattern ...

Page 20

... NOTES: DS21226E-page 20  2004 Microchip Technology Inc. ...

Page 21

... Use of Microchip’s products as critical components in life support systems is not authorized except with express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, under any intellectual property rights.  2004 Microchip Technology Inc. Trademarks The Microchip name and logo, the Microchip logo, Accuron, dsPIC ...

Page 22

... Via Salvatore Quasimodo, 12 20025 Legnano (MI) Milan, Italy Tel: 39-0331-742611 Fax: 39-0331-466781 Netherlands Waegenburghtplein 4 NL-5152 JR, Drunen, Netherlands Tel: 31-416-690399 Fax: 31-416-690340 United Kingdom 505 Eskdale Road Winnersh Triangle Wokingham Berkshire, England RG41 5TU Tel: 44-118-921-5869 Fax: 44-118-921-5820 07/12/04  2004 Microchip Technology Inc. ...

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