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)： 49/52頁(yè)
文件大?。?/td> 220K
代理商： HD74AC
Design Considerations
48
Since the static I
CC
requirements of CMOS devices are so low, output load currents must be prevented from
masking the current load of the device during an I
CC
test. Even a standard 500
load resistor will sink 10
mA at 5 V, which is more than twice the I
CC
level being tested. Thus, most manufacturers will specify that
all outputs must be unloaded during I
CC
tests.
Another area of concern is identified when considering the inputs of the device. When the input is in the
transition region, I
CC
can be several orders of magnitude greater than the specification. When the input
voltage is in the transition region, both the n-channel and the p-channel transistors in the input totem-pole
structure will be slightly on, and a conduction is created from V
CC
to ground. This conduction path leads to
the increased I
CC
current seen in the I
CC
vs. V
IN
curve (figure 22). When the input is at either rail, the input
structure no longer conducts. Most I
CC
testing is done with all of the inputs tied to either V
CC
or ground. If
the inputs are allowed to float, they will typically float to the middle of the transition region, and the input
structure will conduct an order of magnitude more current than the actual I
CC
of the device under test which
is being measured by the tester.
When testing the I
CC
of a CMOS HD74AC245/HD74ACT245, problems can arise depending upon how the
test is conducted. Note the structure of the HD74AC245/HD74ACT245’s I/O pins illustrated figure 23.
10.00
0.00
0.00
5.00
I
C
(
V
IN
(V)
Figure 22 I
CC
versus I
IN
Drive Enable
I/O PAD
I/O PAD
Figure 23 HD74AC245/HD74ACT245 I/O Structure
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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