24LCS21 Datasheet, PDF (1/12 Pages) Microchip Technology – 1K 2.5V Dual Mode I 2 C Serial EEPROM

24LCS21
1K 2.5V Dual Mode I²C^™ Serial EEPROM
FEATURES
• Completely implements DDC1™/DDC2™
interface for monitor identification
• Hardware write-protect pin
• Single supply with operation down to 2.5V
• Low power CMOS technology
- 1 mA active current typical
- 10 µA standby current typical at 5.5V
• 2-wire serial interface bus, I²C™ compatible (SCL)
• Self-timed write cycle (including auto-erase)
• Page-write buffer for up to 8 bytes
• 100 kHz (2.5V) and 400 kHz (5V) compatibility
(SCL)
• 10,000,000 erase/write cycles guaranteed
• Data retention > 200 years
• 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
DESCRIPTION
The Microchip Technology Inc. 24LCS21 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
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 select-
able read/write capability of the memory array in stan-
dard I²C protocol.
The 24LCS21 also enables the user to write-protect the
entire memory contents using its write-protect pin. The
24LCS21 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
WP 3
VSS 4
SOIC
NC ¹
NC ²
WP ³
VSS ⁴
8 VCC
7 VCLK
6 SCL
5 SDA
8 _VCC
7 _VCLK
6 _SCL
5 _SDA
BLOCK DIAGRAM
WP
HV GENERATOR
I/O
CONTROL
LOGIC
MEMORY
CONTROL
LOGIC
XDEC
SDA SCL
VCLK
VCC
VSS
EEPROM
ARRAY
PAGE LATCHES
YDEC
SENSE AMP
R/W CONTROL
DDC is a trademark of the Video Electronics Standards Association.
I²C is a trademark of Philips Corporation.
© 1996 Microchip Technology Inc.
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DS21127B-page 1