ª

1997 Microchip Technology Inc.

Preliminary

DS21226A-page 1
M

24LCS61/24LCS62

PRODUCT OFFERING
FEATURES

• Low power CMOS technology
- 1 mA active current typical
- 10

m

A standby current typical at 5.5V
• Software addressability allows up to 255 devices
on the same bus
• 2-wire serial interface bus, I

2

C compatible
• Automatic bus arbitration
• Wakes up to control code 0110
• General purpose output pin can be used to
enable other circuitry
• 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
• 10,000,000 erase/write cycles guaranteed
• 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 system. Low current design permits opera-
tion with typical standby and active currents of only
10

m

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.

PACKAGE TYPES
BLOCK DIAGRAM

Device
Array
Size
Voltage
Range
Software
Write
Protection

24LCS61 1K bits 2.5V-5.5V Entire Array
24LCS62 2K bits 2.5V-5.5V Lower Half
- Commercial (C): 0



C to +70



C
- Industrial (I): -40



C to +85



C
PDIP
NC
NC
EDS
Vss
Vcc
NC
SCL
SDA
24LCS61/62
1
2
3
4
8
7
6
5
NC
NC
EDS
Vss
VCC
NC
SCL
SDA
24LCS61/62
1
2
3
4
8
7
6
5
SOIC
TSSOP
24LCS61/62
NC
NC
EDS
VSS
Vcc
NC
SCL
SDA
1
2
3
4
8
7
6
5
I/O
Control
Logic
Memory
Control
Logic XDEC
HV Generator
EEPROM
Array
YDEC
Vcc
Vss
SENSE AMP
R/W CONTROL
SDA SCL
EDS
ID Register
Serial Number

1K/2K Software Addressable I

2

C

™

Serial EEPROM

I

2

C is a trademark of Philips Corporation.