25C640 Microchip Technology, Inc., 25C640 Datasheet
25C640
Manufacturer Part Number
25C640
Description
The 25AA640 is a 64K-bit Serial Electrically Erasable Prom With Memory Accessed Via a Simple Serial Peripheral Interface (SPI™) Compatible Serial Bus
Manufacturer
Microchip Technology, Inc.
Datasheet
1.25C640.pdf
(24 pages)
Device Selection Table
Features
• Low power CMOS technology
• 8192 x 8 bit organization
• 32 byte page
• Write cycle time: 5 ms max.
• Self-timed ERASE and WRITE cycles
• Block write protection
• Built-in write protection
• Sequential read
• High reliability
• 8-pin PDIP, SOIC and TSSOP packages
• Temperature ranges supported:
Package Types
*25XX640 is used in this document as a generic part number for the 25AA640/25LC640 devices.
M
25AA640
25LC640
25LC640
- Write current: 3 mA typical
- Read current: 500 A typical
- Standby current: 500 nA typical
- Protect none, 1/4, 1/2 or all of array
- Power on/off data protection circuitry
- Write enable latch
- Write protect pin
- Data retention: > 200 years
- ESD protection: > 4000V
- Industrial (I): -40 C to +85 C
- Automotive (E): -40 C to +125 C
2001 Microchip Technology Inc.
Number
Part
1.8-5.5V
2.5-5.5V
4.5-5.5V
Range
V
CC
V
WP
CS
SO
SS
1
2
3
4
64K SPI™ Bus Serial EEPROM
Frequency
PDIP/SOIC
Max Clock
3/2.5 MHz
1 MHz
2 MHz
8
7
6
5
25AA640/25LC640
V
HOLD
SCK
SI
Ranges
CC
Temp
I, E
I
I
HOLD
Description
The Microchip Technology Inc. 25AA640/25LC640
(25XX640
PROM [EEPROM]. The memory is accessed via a sim-
ple 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.
Block Diagram
V
HOLD
SO
CS
CC
SCK
WP
SO
CS
SI
1
2
3
4
I/O Control
Register
*
Status
) is a 64K bit Serial Electrically Erasable
Logic
TSSOP
V
V
CC
SS
Memory
Control
Logic
8
7
6
5
SCK
SI
V
WP
SS
Dec
X
DS21223E-page 1
Sense Amp.
R/W Control
Y Decoder
HV Generator
Page Latches
EEPROM
Array
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