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DM74LS670 Scheda tecnica(PDF) 3 Page - Fairchild Semiconductor

Il numero della parte DM74LS670
Spiegazioni elettronici  3-STATE 4-by-4 Register File
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Homepage  http://www.fairchildsemi.com
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Absolute Maximum Ratings(Note 4)
Note 4: The “Absolute Maximum Ratings” are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommended Operating Conditions” table will define the conditions
for actual device operation.
Recommended Operating Conditions
Note 5: TA = 25°C and VCC = 5V.
Note 6: Times are with respect to the Write-Enable input. Write-Select time will protect the data written into the previous address. If protection of data in the
previous address, tSETUP (WA, WB) can be ignored. As any address selection sustained for the final 30 ns of the Write-Enable pulse and during tH (WA, WB)
will result in data being written into that location. Depending on the duration of the input conditions, one or a number of previous addresses may have been
written into.
Note 7: Latch time is the time allowed for the internal output of the latch to assume the state of new data. This is important only when attempting to read from
a location immediately after that location has received new data.
Supply Voltage
7V
Input Voltage
7V
Operating Free Air Temperature Range
0
°C to +70°C
Storage Temperature Range
−65°C to +150°C
Symbol
Parameter
Min
Nom
Max
Units
VCC
Supply Voltage
4.75
5
5.25
V
VIH
HIGH Level Input Voltage
2
V
VIL
LOW Level Input Voltage
0.8
V
IOH
HIGH Level Output Current
−2.6
mA
IOL
LOW Level Output Current
24
mA
tW
Write Enable Pulse Width (Note 5)
25
ns
tSU
Setup Time
Data
10
ns
(Note 5)(Note 6)
WA, WB
15
tH
Hold Time
Data
15
ns
(Note 5)(Note 6)
WA, WB
5
tLATCH
Latch Time for New Data (Note 5)(Note 7)
25
ns
TA
Free Air Operating Temperature
0
70
°C


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