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AT25256B-SHL-B PDF预览

AT25256B-SHL-B

更新时间： 2024-02-15 07:10:17
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爱特美尔 - ATMEL 可编程只读存储器电动程控只读存储器电可擦编程只读存储器
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AT25256B-SHL-B 数据手册

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Features  
• Serial Peripheral Interface (SPI) Compatible  
• Supports SPI Modes 0 (0,0) and 3 (1,1)  
• Low-voltage and Standard-voltage Operation  
– 2.7 (VCC = 2.7V to 5.5V)  
– 1.8 (VCC = 1.8V to 5.5V)  
• 3 MHz Clock Rate  
• 64-byte Page Mode and Byte Write Operation  
• Block Write Protection  
– Protect 1/4, 1/2, or Entire Array  
• Write Protect (WP) Pin and Write Disable Instructions for  
Both Hardware and Software Data Protection  
• Self-timed Write Cycle (5 ms Typical)  
• High-reliability  
– Endurance: 100,000 Write Cycles  
– Data Retention: >200 Years  
• Automotive Grade, Extended Temperature and Lead-Free Devices Available  
• 8-lead PDIP, 8-lead EIAJ SOIC, 8-lead and 16-lead JEDEC SOIC, 14-lead and 20-lead  
TSSOP, and 8-lead Leadless Array Packages  
SPI Serial  
EEPROMs  
128K (16,384 x 8)  
256K (32,768 x 8)  
Description  
AT25128(1)  
AT25256(2)  
Notes: 1. This device is not rec-  
ommended for new  
designs. Please refer  
to AT25128A.  
The AT25128/256 provides 131,072/262,144 bits of serial electrically-erasable pro-  
grammable read only memory (EEPROM) organized as 16,384/32,768 words of 8 bits  
each. The device is optimized for use in many industrial and commercial applications  
where low-power and low-voltage operation are essential. The devices are available in  
space saving 8-lead PDIP (AT25128/256), 8-lead EIAJ SOIC (AT25128/256), 8-lead  
and 16-lead JEDEC SOIC (AT25128), 14-lead TSSOP (AT25128), 20-lead TSSOP  
(AT25128/256), and 8-lead Leadless Array (AT25256) packages. In addition, the entire  
family is available in 2.7V (2.7V to 5.5V) and 1.8V (1.8V to 5.5V) versions.  
2. This device is not rec-  
ommended for new  
designs. Please refer  
to AT25256A.  
Table 1. Pin Configuration  
20-lead TSSOP*  
14-lead TSSOP  
Pin Name  
CS  
Function  
NC  
CS  
1
2
3
4
5
6
7
8
9
10  
20  
19  
18  
17  
16  
15  
14  
13  
12  
11  
NC  
CS  
SO  
1
2
3
4
5
6
7
14  
13  
12  
11  
10  
9
VCC  
HOLD  
NC  
Chip Select  
VCC  
HOLD  
HOLD  
NC  
SO  
NC  
SCK  
SI  
Serial Data Clock  
Serial Data Input  
Serial Data Output  
Ground  
NC  
NC  
SO  
NC  
NC  
NC  
WP  
GND  
SCK  
SI  
NC  
NC  
SO  
8
WP  
GND  
DC  
SCK  
SI  
GND  
VCC  
WP  
DC  
NC  
NC  
8-lead PDIP  
Power Supply  
Write Protect  
CS  
1
2
3
4
8
7
6
5
VCC  
8-lead Leadless Array  
SO  
WP  
HOLD  
SCK  
SI  
Suspends Serial  
Input  
HOLD  
VCC  
HOLD  
SCK  
SI  
8
7
6
5
1
2
3
4
CS  
GND  
SO  
NC  
DC  
No Connect  
WP  
GND  
Don't Connect  
16-lead SOIC  
Bottom View  
8-lead SOIC  
CS  
SO  
1
2
3
4
5
6
7
8
16  
15  
14  
13  
12  
11  
10  
9
VCC  
HOLD  
NC  
NC  
NC  
NC  
NC  
NC  
CS  
SO  
1
2
3
4
8
7
6
5
VCC  
NC  
NC  
HOLD  
SCK  
SI  
WP  
GND  
SCK  
SI  
WP  
GND  
Rev. 0872O–SEEPR–03/05  
*Note: Pins 3, 4 and 17, 18 are internally connected for 14-lead TSSOP socket compatibility.  
1234567...22

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