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SN74ACT2227 데이터시트(PDF) 11 Page - Texas Instruments

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부품명 SN74ACT2227
상세설명  DUAL 64 횞 1, DUAL 256 횞 1 FIRST-IN, FIRST-OUT MEMORIES
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SN74ACT2227 데이터시트(HTML) 11 Page - Texas Instruments

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SN74ACT2227, SN74ACT2229
DUAL 64
× 1, DUAL 256 × 1
FIRST-IN, FIRST-OUT MEMORIES
SCAS220C – JUNE 1992 – REVISED OCTOBER 1997
11
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
0
5
10
15
20
25
30
35
40
0
102030405060
SINGLE FIFO SUPPLY CURRENT
vs
CLOCK FREQUENCY
fclock – Clock Frequency – MHz
fI = 1/2 fclock
TA = 75°C
CL = 0 pF
VCC = 5.5 V
VCC = 5 V
VCC = 4.5 V
Figure 5
calculating power dissipation
Data for Figure 5 is taken with one FIFO active and one FIFO idle on the device. The active FIFO has both writes
and reads enabled with its read clock (RDCLK) and write clock (WRTCLK) operating at the rate specified by
fclock. The data input rate and data output rate are half the fclock rate, and the data output is disconnected. A
close approximation to the total device power can be found by Figure 5, determining the capacitive load on the
data output and determining the number of SN74ACT2227/2229 inputs driven by TTL high levels.
With ICC(f) taken from Figure 5, the maximum power dissipation (PT) of one FIFO on the SN74ACT2227 or
SN74ACT2229 can be calculated by:
PT = VCC × [ICC(f) + (N × ∆ICC × dc)] + (CL × VCC2 × fo)
where:
N
=
number of inputs driven by TTL levels
∆ICC = increase in power-supply current for each input at a TTL high level
dc
=
duty cycle of inputs at a TTL high level of 3.4 V
CL
=
output capacitive load
fo
=
switching frequency of an output


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