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AT28HC64BF
3. Block Diagram
VCC
GND
DATA INPUTS/OUTPUTS
I/O0 - I/O7
OE
WE
OE, CE and WE
LOGIC
DATA LATCH
INPUT/OUTPUT
CE
ADDRESS
INPUTS
Y DECODER
BUFFERS
Y-GATING
CELL MATRIX
X DECODER
IDENTIFICATION
4. Device Operation
4.1
4.2
4.3
4.4
Read
Byte Write
Page Write
DATA Polling
The AT28HC64BF is accessed like a Static RAM. When CE and OE are low and WE is high, the
data stored at the memory location determined by the address pins is asserted on the outputs.
The outputs are put in the high-impedance state when either CE or OE is high. This dual line
control gives designers flexibility in preventing bus contention in their systems.
A low pulse on the WE or CE input with CE or WE low (respectively) and OE high initiates a write
cycle. The address is latched on the falling edge of CE or WE, whichever occurs last. The data is
latched by the first rising edge of CE or WE. Once a byte write has been started, it will automati-
cally time itself to completion. Once a programming operation has been initiated and for the
duration of t WC , a read operation will effectively be a polling operation.
The page write operation of the AT28HC64BF allows 1 to 64 bytes of data to be written into the
device during a single internal programming period. A page write operation is initiated in the
same manner as a byte write; after the first byte is written, it can then be followed by 1 to 63
additional bytes. Each successive byte must be loaded within 150 μs (t BLC ) of the previous byte.
If the t BLC limit is exceeded, the AT28HC64BF will cease accepting data and commence the
internal programming operation. All bytes during a page write operation must reside on the same
page as defined by the state of the A6 to A12 inputs. For each WE high-to-low transition during
the page write operation, A6 to A12 must be the same.
The A0 to A5 inputs specify which bytes within the page are to be written. The bytes may be
loaded in any order and may be altered within the same load period. Only bytes which are spec-
ified for writing will be written; unnecessary cycling of other bytes within the page does not occur.
The AT28HC64BF features DATA Polling to indicate the end of a write cycle. During a byte or
page write cycle, an attempted read of the last byte written will result in the complement of the
written data to be presented on I/O7. Once the write cycle has been completed, true data is valid
on all outputs, and the next write cycle may begin. DATA Polling may begin at any time during
the write cycle.
3
3648B–PEEPR–4/09
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相关代理商/技术参数
AT28HC64BF-12JU SL383
制造商:Atmel Corporation 功能描述:EEPROM Parallel 64K-Bit 8K x 8 5V 32-Pin PLCC T/R 制造商:Atmel Corporation 功能描述:, 1M (128K X 8), 5V, SDP - 120NS, PLCC, IND TEMP, GREEN PKG - Tape and Reel
AT28HC64BF-12JU-T
功能描述:IC EEPROM 64KBIT 120NS 32PLCC 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:在售 存储器类型:非易失 存储器格式:EEPROM 技术:EEPROM 存储容量:64Kb （8K x 8） 写周期时间 - 字，页:10ms 访问时间:120ns 存储器接口:并联 电压 - 电源:4.5 V ~ 5.5 V 工作温度:-40°C ~ 85°C（TC） 安装类型:表面贴装 封装/外壳:32-LCC（J 形引线） 供应商器件封装:32-PLCC（11.43x13.97） 标准包装:1
AT28HC64BF-12PU
功能描述:电可擦除可编程只读存储器 1M 5V SDP - 120NS IND TEMP RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8
AT28HC64BF-12SU
功能描述:电可擦除可编程只读存储器 1M 5V SDP - 120NS IND TEMP RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8
AT28HC64BF-12SU SL383
制造商:Atmel Corporation 功能描述:PARALLEL EEPROM, 64K (8K X 8), 制造商:Atmel Corporation 功能描述:EEPROM PARALLEL 64KBIT 8KX8 5V 28SOIC W - Tape and Reel
AT28HC64BF-12SU-T
功能描述:120NS, SOIC, IND TEMP, GREEN 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:在售 存储器类型:非易失 存储器格式:EEPROM 技术:EEPROM 存储容量:64Kb （8K x 8） 写周期时间 - 字，页:10ms 访问时间:120ns 存储器接口:并联 电压 - 电源:4.5 V ~ 5.5 V 工作温度:-40°C ~ 85°C（TC） 安装类型:表面贴装 封装/外壳:28-SOIC（0.295"，7.50mm 宽） 供应商器件封装:28-SOIC 标准包装:1
AT28HC64BF-12TU
功能描述:电可擦除可编程只读存储器 1M 5V SDP - 120NS IND TEMP RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8
AT28HC64BF-70JU
功能描述:电可擦除可编程只读存储器 1M 5V SDP - 70NS IND TEMP RoHS:否 制造商:Atmel 存储容量:2 Kbit 组织:256 B x 8 数据保留:100 yr 最大时钟频率:1000 KHz 最大工作电流:6 uA 工作电源电压:1.7 V to 5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8