參數(shù)資料
型號: 74HCT7030
廠商: NXP Semiconductors N.V.
英文描述: 9-bit x 64-word FIFO register;3-state(64字 x9-位 先進(jìn)先出寄存器;(三態(tài)))
中文描述: 9位x 64字FIFO寄存器,3態(tài)(64字X9熱賣,位先進(jìn)先出寄存器(三態(tài)))
文件頁數(shù): 13/22頁
文件大?。?/td> 172K
代理商: 74HCT7030
December 1990
13
Philips Semiconductors
Product specification
9-bit x 64-word FIFO register; 3-state
74HC/HCT7030
Master reset applied with FIFO full
Fig.8
Waveforms showing the MR input to DIR, DOR output
propagation delays and the MR pulse width.
(1) HC : V
M
= 50%; V
I
= GND to V
.
HCT: V
M
= 1.3 V; V
I
= GND to 3 V.
Notes to
Fig.8
1.
DIR LOW, output ready HIGH;
assume FIFO is full.
MR pulse LOW; clears FIFO.
DIR goes HIGH; flag indicates
input prepared for valid data.
DOR drops LOW; flag indicates
FIFO empty.
2.
3.
4.
Shifting out sequence; FIFO full to FIFO empty
Fig.9
Waveforms showing the SO input to DIR output propagation
delay. The SO pulse width and SO maximum pulse frequency.
(1) HC : V
M
= 50%; V
I
= GND to V
.
HCT: V
M
= 1.3 V; V
I
= GND to 3 V.
Notes to
Fig.9
1.
DOR HIGH; no data transfer in
progress, valid data is present at
output stage.
SO set HIGH; results in DOR
going LOW.
DOR drops LOW; output stage
“busy”.
SO is set LOW; data in the input
stage is unloaded, and new data
replaces it as empty location
“bubbles-up” to input stage.
DOR goes HIGH; transfer
process completed, valid data
present at output after the
specified propagation delay.
Repeat process to unload the 3rd
through to the 64th word from
FIFO.
DOR remains LOW; FIFO is
empty.
2.
3.
4.
5.
6.
7.
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