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參數(shù)資料
| 型號： | 74HC7404D |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | FIFO |
| 英文描述： | 5-Bit x 64-word FIFO register; 3-state |
| 中文描述： | 64 X 5 OTHER FIFO, 98 ns, PDSO20 |
| 封裝： | PLASTIC, SO-20 |
| 文件頁數(shù)： | 6/28頁 |
| 文件大?。?/td> | 131K |
| 代理商： | 74HC7404D |
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September 1993
6
Philips Semiconductors
Product specification
5-Bit x 64-word FIFO register; 3-state
74HC/HCT7404
FUNCTIONAL DESCRIPTION
The DIR flag indicates the input stage
status, either empty and ready to
receive data (DIR = HIGH) or full and
busy (DIR = LOW). When DIR and SI
are HIGH, data present at D
0
to D
4
is
shifted into the input stage; once
complete DIR goes LOW. When SI is
set LOW, data is automatically shifted
to the output stage or to the last
empty location. A FIFO which can
receive data is indicated by DIR set
HIGH.
A DOR flag indicates the output stage
status, either data available
(DOR = HIGH) or busy
(DOR = LOW). When SO and DOR
are HIGH, data is available at the
outputs (Q
0
to Q
4
). When SO is LOW
new data may be shifted into the
output stage, once complete DOR is
set LOW.
Expanded Format
(see Fig.18)
The DOR and DIR signals are used to
allow the ‘7404’ to be cascaded. Both
parallel and serial expansion is
possible. Serial expansion is only
possible with typical devices.
Parallel Expansion
Parallel expansion is accomplished
by logically ANDing the DOR and DIR
signals to form a composite signal.
Serial Expansion
Serial expansion is accomplished by:
tying the data outputs of the first
device to the data inputs of the
second device
connecting the DOR pin of the first
device to the SI pin of the second
device
connecting the SO pin of the first
device to the DIR pin of the second
device.
DC CHARACTERISTICS FOR 74HC
For the DC characteristics see
“74HC/HCT/HCU/HCMOS Logic Family Specifications”
.
Output capability: parallel outputs, bus driver; serial output, standard I
CC
category: MSI
Output capability: driver 8 mA
I
CC
category: LSI
Voltages are referenced to GND (ground = 0 V).
DC CHARACTERISTICS FOR 74HC
SYMBOL
PARAMETER
T
amb
°
C
UNIT
TEST CONDITION
+25
40 to +85
40 to +125
V
CC
(V)
V
I
OTHER
MIN
TYP
MAX
MIN
MAX
MIN
MAX
V
OH
HIGH level
output voltage
3.98
5.48
4.32
5.81
3.84
5.34
3.70
5.20
V
V
4.5
6
V
IH
or
V
IL
V
IH
or
V
IL
I
O
=
8 mA
I
O
=
10 mA
V
OL
LOW level
output voltage
0.15
0.15
0.26
0.26
0.33
0.33
0.4
0.4
V
V
4.5
6
I
O
= 8 mA
I
O
= 10 mA
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