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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 |
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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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD74AC00 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Quad 2-Input NAND Gate |
| HD74AC00FP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Quad 2-input NAND Gate |
| HD74AC00FPEL | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Quad 2-Input NAND Gate |
| HD74AC00P | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Quad 2-Input NAND Gate |
| HD74AC00RPEL | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Quad 2-Input NAND Gate |
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