參數(shù)資料
型號(hào)： 25C640
廠商： Microchip Technology Inc.
英文描述： 64K SPI Bus Serial EEPROM
中文描述： 64K的SPI總線串行EEPROM
文件頁數(shù)： 1/12頁
文件大?。?/td> 196K
代理商： 25C640
1997 Microchip Technology Inc.
Preliminary
DS21223A-page 1
M
25AA640/25LC640/25C640
DEVICE SELECTION TABLE
FEATURES
Low power CMOS technology
- Write current: 3 mA typical
- Read current: 500
- Standby current: 500 nA typical
8192 x 8 bit organization
32 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: 1M 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) (25C640)
μ
A typical
DESCRIPTION
The Microchip Technology Inc. 25AA640/25LC640/
25C640 (25xx640
) is a 64K 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.
*
PACKAGE TYPES
BLOCK DIAGRAM
Part
Number
25AA640
25LC640
25C640
V
CC
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
0
°
°
°
C to
C to
C to +125
+70
+85
°
°
°
C
C
C
-40
-40
2
TSSOP
1
2
3
4
8
7
6
5
SCK
SI
V
SS
WP
HOLD
V
CC
CS
SO
2
PDIP/SOIC
1
2
3
4
8
7
6
5
V
CC
HOLD
SCK
SI
CS
SO
WP
V
SS
SI
SO
SCK
CS
HOLD
WP
Status
Register
I/O Control
Logic
Memory
Control
Logic
X
Dec
HV Generator
EEPROM
Array
Page Latches
Y Decoder
Sense Amp.
R/W Control
V
CC
V
SS
64K SPI
Bus Serial EEPROM
*25xx640 is used in this document as a generic part number for the 25AA640/25LC640/25C640 devices.
SPI is a trademark of Motorola.
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