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MicrochipTechnology - 4K SPI Bus Serial EEPROM

Numéro de référence 24C040-EST
Description 4K SPI Bus Serial EEPROM
Fabricant MicrochipTechnology 
Logo MicrochipTechnology 





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24C040-EST fiche technique
M 25AA040/25LC040/25C040
4K SPIBus Serial EEPROM
DEVICE SELECTION TABLE
Part
Number
25AA040
25LC040
25C040
VCC
Range
1.8-5.5V
2.5-5.5V
4.5-5.5V
Max Clock
Frequency
1 MHz
2 MHz
3 MHz
Temp
Ranges
C,I
C,I
C,I,E
FEATURES
• Low power CMOS technology
- Write current: 3 mA typical
- Read current: 500 µA typical
- Standby current: 500 nA typical
• 512 x 8 bit organization
• 16 byte page
• Write cycle time: 5ms max.
• Self-timed ERASE and WRITE cycles
• Block write protection
- Protect none, 1/4, 1/2, or all of array
• Built-in write protection
- Power on/off data protection circuitry
- Write enable latch
- Write protect pin
• Sequential read
• High reliability
- Endurance: 10M cycles (guaranteed)
- Data retention: > 200 years
- ESD protection: > 4000 V
• 8-pin PDIP, SOIC, and TSSOP packages
• Temperature ranges supported:
- Commercial: (C)
- Industrial: (I)
- Automotive: (E) (25C040)
0°C to +70°C
-40°C to +85°C
-40°C to +125°C
DESCRIPTION
The Microchip Technology Inc. 25AA040/25LC040/
25C040 (25xx040*) is a 4K bit serial Electrically Eras-
able PROM. The memory is accessed via a simple
Serial Peripheral Interface (SPI) compatible serial bus.
The bus signals required are a clock input (SCK) plus
separate data in (SI) and data out (SO) lines. Access to
the device is controlled through a chip select (CS) input.
Communication to the device can be paused via the
hold pin (HOLD). While the device is paused, transi-
tions on its inputs will be ignored, with the exception of
chip select, allowing the host to service higher priority
interrupts. Also, write operations to the device can be
disabled via the write protect pin (WP).
PACKAGE TYPES
PDIP/SOIC
CS 1
8 VCC
SO 2
7 HOLD
WP 3
6 SCK
VSS 4
5 SI
HOLD
VCC
CS
SO
TSSOP
18
27
36
45
SCK
SI
VSS
WP
BLOCK DIAGRAM
Status
Register
HV Generator
I/O Control
Logic
Memory
Control
Logic
X
Dec
EEPROM
Array
Page Latches
SI
SO
CS
SCK
HOLD
WP
VCC
VSS
Y Decoder
Sense Amp.
R/W Control
*25xx040 is used in this document as a generic part number for the 25AA040/25LC040/25C040 devices.
SPI is a trademark of Motorola.
© 1997 Microchip Technology Inc.
Preliminary
DS21204A-page 1

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