参数资料
型号: IDT72403L45P
厂商: IDT, Integrated Device Technology Inc
文件页数: 8/9页
文件大小: 0K
描述: IC FIFO PAR 64X4 45NS 16-DIP
标准包装: 25
系列: 7200
功能: 异步
存储容量: 256(64 x 4)
访问时间: 45ns
电源电压: 4.5 V ~ 5.5 V
工作温度: 0°C ~ 70°C
安装类型: 通孔
封装/外壳: 16-DIP(0.300",7.62mm)
供应商设备封装: 16-PDIP
包装: 管件
其它名称: 72403L45P
MILITARY AND COMMERCIAL
TEMPERATURE RANGES
IDT72401/72403
CMOS PARALLEL FIFO 64 x 4, 64 x 5
8
JUNE 29, 2012
NOTES:
1. When the memory is empty, the last word will remain on the outputs until the MR is strobed or a new data word falls through to the output. However, OR will remain LOW,
indicating data at the output is not valid.
2. When the output data changes as a result of a pulse on SO, the OR signal always goes LOW before there is any change in output data and stays LOW until the new data
has appeared on the outputs. Anytime OR is HIGH, there is valid stable data on the outputs.
3. If SO is held HIGH while the memory is empty and a word is written into the input, that word will appear at the output after a fall-through time. OR will go HIGH for one
internal cycle (at least tORL) and then go back LOW again. The stored word will remain on the outputs. If more words are written into the FIFO, they will line up behind the
first word and will not appear on the outputs until SO has been brought LOW.
4. When the MR is brought LOW, the outputs are cleared to LOW, IR goes HIGH and OR goes LOW. If SI is HIGH when the MR goes HIGH, the data on the inputs will be
written into the memory and IR will return to the LOW state until SI is brought LOW. If SI is LOW when the MR is ended, IR will go HIGH, but the data in the inputs will not
enter the memory until SI goes HIGH.
5. FIFOs are expandable on depth and width. However, in forming wider words, two external gates are required to generate composite Input and OR flags. This is due to the
variation of delays of the FIFOs.
Figure 11. 192 x 12 Depth and Width Expansion
2747 drw 15
IR
SI
SO
OR
SI
IR
OR
SO
SI
IR
OR
SO
SI
IR
OR
SO
SHIFT OUT
COMPOSITE
OUTPUT
READY
MR
SHIFT IN
COMPOSITE
INPUT
READY
IR
SI
SO
OR
IR
SI
SO
OR
IR
SI
SO
OR
IR
SI
SO
OR
IR
SI
SO
OR
MR
Q0
Q1
Q2
Q3
D0
D1
D2
D3
MR
Q0
Q1
Q2
Q3
D0
D1
D2
D3
MR
Q0
Q1
Q2
Q3
D0
D1
D2
D3
MR
Q0
Q1
Q2
Q3
D0
D1
D2
D3
MR
Q0
Q1
Q2
Q3
D0
D1
D2
D3
MR
Q0
Q1
Q2
Q3
D0
D1
D2
D3
MR
Q0
Q1
Q2
Q3
D0
D1
D2
D3
MR
Q0
Q1
Q2
Q3
D0
D1
D2
D3
MR
Q0
Q1
Q2
Q3
D0
D1
D2
D3
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