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25AA256T-I/ST 其他数据使用手册 - Microchip（微芯）
制造商:
Microchip（微芯）
分类:
EEPROM芯片
封装:
TSSOP-8
描述:
256K SPI总线串行EEPROM 256K SPI Bus Serial EEPROM
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25AA256T-I/ST数据手册
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2003-2019 Microchip Technology Inc. DS20001822H-page 1
25AA256/25LC256
Device Selection Table
Features
• Max. Clock 10 MHz
• Low-Power CMOS Technology:
- Max. Write Current: 5 mA at 5.5V, 10 MHz
- Read Current: 6 mA at 5.5V, 10 MHz
- Standby Current: 1 A at 5.5V
• 32,768 x 8-Bit Organization
• 64-Byte Page
• Self-Timed Erase and Write Cycles (5 ms max.)
• 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: 1,000,000 erase/write cycles
- Data retention: > 200 years
- ESD protection: > 4000V
• Temperature Ranges Supported:
• RoHS Compliant
• Automotive AEC-Q100 Qualified
Pin Function Table
Description
The Microchip Technology Inc. 25AA256/25LC256
(25XX256
(1)
) are 256 Kbit Serial Electrically Erasable
PROMs. 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,
transitions on its inputs will be ignored, with the
exception of Chip Select, allowing the host to service
higher priority interrupts.
The 25XX256 is available in standard packages includ-
ing 8-lead PDIP and SOIC, and advanced packaging
including 8-lead DFN and 8-lead TSSOP.
Package Types (not to scale)
Part Number VCC Range Page Size Temp. Ranges Packages
25LC256 2.5-5.5V 64 Byte I, E P, SN, SM, ST, MF
25AA256 1.8-5.5V 64 Byte I, E P, SN, SM, ST, MF
- Industrial (I): -40Cto +85C
- Extended (E): -40°C to +125°C
Name Function
CS
Chip Select Input
SO Serial Data Output
WP
Write-Protect
V
SS Ground
SI Serial Data Input
SCK Serial Clock Input
HOLD
Hold Input
V
CC Supply Voltage
Note 1: 25XX256 is used in this document as a
generic part number for the 25AA256/
25L256 devices.
CS
SO
WP
V
SS
1
2
3
4
8
7
6
5
V
CC
HOLD
SCK
SI
PDIP/SOIC
(P, SN, SM)
TSSOP
(ST)
DFN
CS
SO
WP
V
SS
HOLD
SCK
SI
5
6
7
8
4
3
2
1
V
CC
(MF)
8
7
6
5
1
2
3
4
HOLD
V
CC
CS
SO
SCK
SI
V
SS
WP
Rotated TSSOP
(ST)
8
7
6
5
1
2
3
4
HOLD
V
CC
CS
SO
SCK
SI
V
SS
WP
256K SPI Bus Serial EEPROM
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