參數(shù)資料
型號(hào)： 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(yè)數(shù)： 7/52頁(yè)
文件大小： 220K
代理商： HD74AC
FACT Descriptions and Family Characteristics
6
We can calculate what current is required by looking at the Bergeron diagram. The quiescent voltage on
the line will be within 100 mV of either rail. We know what voltage is required to guarantee a valid
voltage at the receiver. This is either 70% or 30% of V
CC
. The formula for calculating the current and
voltage required is | (V
OQ
–V
I
)/Z
O
| at V
I
. For V
OQ
= 100 mV, V
IH
= 3.85 V, V
CC
= 5.5 V and Z
O
= 50
, the
required I
OH
at 3.85 V is 75 mA. For the high-to-low transition, V
QQ
= 5.4 V, V
IL
= 1.65 V, and Z
O
= 50
,
I
OL
is 75 mA at 1.65 V. FACT’s I/O specifications include these limits. For transmission lines with
impedances greater than 50
, the current requirements are less and switching is still guaranteed.
It is important to note that the typical 24 mA drive specification is not adequate to guarantee incident wave
switching. The only way to guarantee this is to guarantee the current required to switch a transmission line
from the output quiescent point to the valid V
IN
level.
The performance charts in figures 5 to 7 are provided in order to aid the designer in determining dynamic
output current drive of FACT devices with various power supply voltage.
V
Current (mA)
–50
–100
–150
–200 mA
0
–2
2
–1
1
0
3
4
5
6
7
V
CC
= 4.5 V
V
CC
= 5.5 V
V
CC
= 5.0 V
Figure 5 Output Characteristics V
OH
/I
OH
, HD74AC00
Current (mA)
150
100
50
200 mA
0
V
–2
2
–1
1
0
3
4
5
6
7
V
CC
= 4.5 V
V
CC
= 5.0 V
V
CC
= 5.5 V
Figure 6 Output Characteristics V
OL
/I
OL
, HD74AC00
相關(guān)PDF資料
PDF描述
HD74ALVC162244 16-bit Buffer / Driver with 3-state Outputs(帶三態(tài)輸出的16位緩沖器/驅(qū)動(dòng)器)
HD74ALVC162334 16-bit Universal Bus Driver with 3-state Outputs(帶三態(tài)輸出的16位通用總線驅(qū)動(dòng)器)
HD74ALVC16244 16-bit Buffer / Driver with 3-state Outputs(帶三態(tài)輸出的16位緩沖器/驅(qū)動(dòng)器)
HD74ALVC162831 1-bit to 4-bit Address Register / Driver with 3-state Outputs(三態(tài)輸出的1位-4位地址寄存器/驅(qū)動(dòng)器)
HD74ALVC162834A 1-Of-8 Data Selectors/Multiplexers 16-CDIP -55 to 125
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(chēng):Hitachi Semiconductor 功能描述:Quad 2-Input NAND Gate
HD74AC00FP 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Quad 2-input NAND Gate
HD74AC00FPEL 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:Quad 2-Input NAND Gate
HD74AC00P 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:Quad 2-Input NAND Gate
HD74AC00RPEL 制造商:RENESAS 制造商全稱(chēng):Renesas Technology Corp 功能描述:Quad 2-Input NAND Gate
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