參數(shù)資料
型號: HD74AC
廠商: Hitachi,Ltd.
英文描述: HD74AC Series Common Information
中文描述: HD74AC系列通用信息
文件頁數(shù): 3/52頁
文件大?。?/td> 220K
代理商: HD74AC
FACT Descriptions and Family Characteristics
2
1.3 Low Power CMOS Operation
If there is one single characteristic that justifies the existence of CMOS, it is low power dissipation. In the
quiescent state, FACT draws three orders of magnitude less power than the equivalent LS or ALS TTL
device. This enhances system reliability; because costly regulated high current power supplies, heat sinks
and fans are eliminated. FACT logic devices are ideal for portable systems such as laptop computers and
backpack communications systems. Operating power is also very low for FACT logic. Power
consumption of various technologies with a clock frequency of 1 MHz is shown below.
FACT = 0.1 mW/gate
ALS = 1.2 mW/gate
LS = 2.0 mW/gate
HC = 0.1 mW/gate
Figure 1 illustrates the effects of I
CC
versus power supply voltage (V
CC
) for two load capacitance values: 50
pF and stray capacitance. The clock frequency was 1 MHz for the measurements.
C
L
= 50 pF @ 1 MHz
I
C
μ
A
C
L
= Fixture Capacitance
@ 1 MHz
6
4
V
CC
(Volts)
2
0
0
100
200
300
400
500
Figure 1 I
CC
vs V
CC
1.4 AC Performance
In comparison to LS, ALS and HC families, FACT devices have faster internal gate delays as well as the
basic gate delays. Additionally, as the level of integration increases, FACT logic leads the way to very
high-speed systems.
The example below describes typical values for a HD74XX138, 3 to 8 line decoder.
FACT = 6.0 ns @ C
L
= 50 pF
ALS = 12.0 ns @ C
L
= 50 pF
LS = 27.0 ns @ C
L
= 15 pF
HC = 17.0 ns @ C
L
= 50 pF
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