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74HCT7404D Arkusz danych(PDF) 6 Page - NXP Semiconductors

Numer części 74HCT7404D
Szczegółowy opis  5-Bit x 64-word FIFO register; 3-state
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Producent  PHILIPS [NXP Semiconductors]
Strona internetowa  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74HCT7404D Arkusz danych(HTML) 6 Page - NXP Semiconductors

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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 D0 to D4 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 (Q0 to Q4). 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 ICC category: MSI
Output capability: driver 8 mA
ICC category: LSI
Voltages are referenced to GND (ground = 0 V).
DC CHARACTERISTICS FOR 74HC
SYMBOL
PARAMETER
Tamb °C
UNIT
TEST CONDITION
+25
−40 to +85 −40 to +125
VCC
(V)
VI
OTHER
MIN
TYP
MAX
MIN
MAX
MIN
MAX
VOH
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
VIH
or
VIL
IO = −8 mA
IO = −10 mA
VOL
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
VIH
or
VIL
IO = 8 mA
IO = 10 mA


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