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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)： | 33/52頁 |
| 文件大?。?/td> | 220K |
| 代理商： | HD74AC |
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Design Considerations
32
1. Interfacing
FACT devices have outputs which combine balanced CMOS outputs with high current line driving
capability. Each standard output is guaranteed to source or sink 24 mA of current at worst case conditions.
This allows FACT circuits to drive more loads than standard advanced Schottky parts; FACT can directly
drive ALS, AS, LS, HC, and HCT devices.
AC/ACT
NMOS,
CMOS or
TTL
V
CC
Figure 1 Interfacing FACT to NMOS, CMOS and TTL
FACT devices can be directly driven by both NMOS and CMOS families, as shown in figure 1, operating
at the same rail potential without special considerations. This is possible due to the low input loading of
FACT product, guaranteed to be less than 1
μ
A per input.
Some older technologies, including all existing TTL families, will not be able to drive FACT circuits
directly; this is due to inadequate high level capability, which is guaranteed to 2.4 V. There are two simple
approaches to the TTL-to-FACT interface problem. A TTL-to-CMOS converter can be constructed
employing a resistor pull-up to V
CC
of approximately 4.7 k
, which is depicted in figure 2. The correct
high level is seen by the CMOS device while not loading down the TTL driver.
TTL
AC
Figure 2 V
IH
Pull-Up on TTL Outputs
Unfortunately, there will be designs where including a pull-up resistor will not be acceptable. In these
cases, such as a terminated TTL bus, Hitachi has designed devices which offer thresholds that are TTL-
compatible (figure 3). These interfaces tend to be slightly slower than their CMOS-level counter-parts due
to an extra buffer stage required for level conversion.
TTL
V
CC
ACT
Figure 3 TTL Interfacing to HD74ACT
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PDF描述 |
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| HD74ALVC162244 | 16-bit Buffer / Driver with 3-state Outputs(帶三態(tài)輸出的16位緩沖器/驅(qū)動器) |
| 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)動器) |
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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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