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参数资料
| 型号： | 25AA640XT-I/ST |
| 厂商： | Microchip Technology |
| 文件页数： | 1/24页 |
| 文件大小： | 0K |
| 描述： | IC EEPROM 64KBIT 1MHZ 8TSSOP |
| 标准包装： | 2,500 |
| 格式 - 存储器： | EEPROMs - 串行 |
| 存储器类型： | EEPROM |
| 存储容量： | 64K (8K x 8) |
| 速度： | 1MHz |
| 接口： | SPI 3 线串行 |
| 电源电压： | 1.8 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 8-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 8-TSSOP |
| 包装： | 带卷 (TR) |
Not recommended for new designs –
Please use 25AA640A or 25LC640A.
25AA640/25LC640
64K SPI Bus Serial EEPROM
Device Selection Table
Description:
Part
Number
25AA640
25LC640
25LC640
V CC
Range
1.8-5.5V
2.5-5.5V
4.5-5.5V
Max Clock
Frequency
1 MHz
2 MHz
3/2.5 MHz
Temp
Ranges
I
I
I, E
The Microchip Technology Inc. 25AA640/25LC640
(25XX640 * ) is a 64 Kbit Serial Electrically Erasable
PROM [EEPROM]. 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)
Features:
? Low-Power CMOS Technology
- Write current: 3 mA, typical
- Read current: 500 μ A, typical
- Standby current: 500 nA, typical
? 8192 x 8 Bit Organization
? 32 Byte Page
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.
Block Diagram
? Write Cycle Time: 5 ms max.
? Self-Timed Erase and Write Cycles
? Block Write Protection
- Protect none, 1/4, 1/2 or all of array
? Built-in Write Protection
STATUS
Register
HV Generator
- Power on/off data protection circuitry
- Write enable latch
- Write-protect pin
I/O Control
Logic
Memory
Control
Logic
XDEC
EEPROM
Array
? Sequential Read
? High Reliability
- Data retention: > 200 years
- ESD protection: > 4000V
SI
Page
Latches
? 8-pin PDIP, SOIC and TSSOP Packages
? Temperature Ranges Supported:
- Industrial (I): -40 ° C to +85 ° C
- Automotive (E): -40 ° C to +125 ° C
SO
CS
SCK
HOLD
Y Decoder
Sense Amp.
R/W Control
WP
V CC
V SS
Package Types
CS
1
PDIP/SOIC
8
V CC
TSSOP
SO
WP
2
3
7
6
HOLD
SCK
HOLD
V CC
CS
SO
1
2
3
4
8
7
6
5
SCK
SI
V SS
WP
V SS
4
5
SI
*25XX640 is used in this document as a generic part number for the 25AA640/25LC640 devices.
? 2008 Microchip Technology Inc.
DS21223H-page 1
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