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SN74ACT2236 датащи(PDF) 10 Page - Texas Instruments

номер детали SN74ACT2236
подробное описание детали  1024x9x2 ASYNCHRONOUS BIDIRECTIONAL FIRST-IN, FIRST-OUT MEMORY
PDF  14 Pages
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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SN74ACT2236 датащи(HTML) 10 Page - Texas Instruments

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SN74ACT2236
1024 × 9 × 2
ASYNCHRONOUS BIDIRECTIONAL FIRST IN, FIRST OUT MEMORY
SCAS149A − APRIL 1990 − REVISED SEPTEMBER 1995
10
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251−1443
operating characteristics, VCC = 5 V, TA = 25°C
PARAMETER
TEST CONDITIONS
TYP
UNIT
Cpd
Power dissipation capacitance per 1K bits
Outputs enabled
CL = 50 pF, f = 5 MHz
71
pF
Cpd
Power dissipation capacitance per 1K bits
Outputs disabled
CL = 50 pF, f = 5 MHz
57
pF
TYPICAL CHARACTERISTICS
PROPAGATION DELAY TIME
vs
LOAD CAPACITANCE
0
50
100
200
250
150
300
typ − 2
CL − Load Capacitance − pF
typ
typ + 2
typ + 4
typ + 6
typ + 8
VCC = 5 V
TA = 25°C
RL = 500 Ω
4.5
4.6
4.7 4.8
4.9
5
5.1 5.2
5.3
5.4
5.5
typ + 2
typ + 1
typ
typ − 1
typ − 2
POWER DISSIPATION CAPACITANCE
vs
SUPPLY VOLTAGE
VCC − Supply Voltage − V
VCC = 5 V
fi = 5 MHz
TA = 25°C
typ − 3
Figure 2
Figure 3
calculating power dissipation
The maximum power dissipation (PT) can be calculated by:
PT = VCC × [ICC + (N × ∆ICC × dc)] + Σ(Cpd × VCC2 × fi) + Σ(CL × VCC2 × fo)
where:
ICC
= power-down ICC maximum
N
= number of inputs driven by a TTL device
∆ICC = increase in supply current
dc
= duty cycle of inputs at a TTL high level of 3.4 V
Cpd
= power dissipation capacitance
CL
= output capacitive load
fi
= data input frequency
fo
= data output frequency



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