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參數(shù)資料
| 型號(hào)： | 74ACQ646SCX |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 通用總線功能 |
| 英文描述： | CMOS, µP Compatible, 5µs/10µs, 8-Bit ADCs |
| 中文描述： | AC SERIES, 8-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDSO24 |
| 封裝： | 0.300 INCH, MS-013, SOIC-24 |
| 文件頁數(shù)： | 8/10頁 |
| 文件大?。?/td> | 97K |
| 代理商： | 74ACQ646SCX |
www.fairchildsemi.com
8
7
FACT Noise Characteristics
The setup of a noise characteristics measurement is critical
to the accuracy and repeatability of the tests. The following
is a brief description of the setup used to measure the
noise characteristics of FACT.
Equipment:
Hewlett Packard Model 8180A Word Generator
PC-163A Test Fixture
Tektronics Model 7854 Oscilloscope
Procedure:
1. Verify Test Fixture Loading: Standard Load 50 pF,
500
.
2. Deskew the HFS generator so that no two channels
have greater than 150 ps skew between them. This
requires that the oscilloscope be deskewed first. It is
important to deskew the HFS generator channels
before testing. This will ensure that the outputs switch
simultaneously.
3. Terminate all inputs and outputs to ensure proper load-
ing of the outputs and that the input levels are at the
correct voltage.
4. Set the HFS generator to toggle all but one output at a
frequency of 1 MHz. Greater frequencies will increase
DUT heating and effect the results of the measure-
ment.
5. Set the HFS generator input levels at 0V LOW and 3V
HIGH for ACT devices and 0V LOW and 5V HIGH for
AC devices. Verify levels with an oscilloscope.
FIGURE 5. Quiet Output Noise Voltage Waveforms
Note 20:
V
OHV
and V
OLP
are measured with respect to ground reference.
Note 21:
Input pulses have the following characteristics: f
=
1 MHz,
t
r
=
3 ns, t
f
=
3 ns, skew
<
150 ps.
V
OLP
/V
OLV
and V
OHP
/V
OHV
:
Determine the quiet output pin that demonstrates the
greatest noise levels. The worst case pin will usually be
the furthest from the ground pin. Monitor the output volt-
ages using a 50
coaxial cable plugged into a standard
SMB type connector on the test fixture. Do not use an
active FET probe.
Measure V
OLP
and V
OLV
on the quiet output during the
worst case transition for active and enable. Measure
V
OHP
and V
OHV
on the quiet output during the worst
case active and enable transition.
Verify that the GND reference recorded on the oscillo-
scope has not drifted to ensure the accuracy and repeat-
ability of the measurements.
V
ILD
and V
IHD
:
Monitor one of the switching outputs using a 50
coaxial
cable plugged into a standard SMB type connector on
the test fixture. Do not use an active FET probe.
First increase the input LOW voltage level, V
IL
,until the
output begins to oscillate or steps out a min of 2 ns.
Oscillation is defined as noise on the output LOW level
that exceeds V
IL
limits, or on output HIGH levels that
exceed V
IH
limits. The input LOW voltage level at which
oscillation occurs is defined as V
ILD
.
Next decrease the input HIGH voltage level, V
IH
, until
the output begins to oscillate or steps out a min of 2 ns.
Oscillation is defined as noise on the output LOW level
that exceeds V
IL
limits, or on output HIGH levels that
exceed V
IH
limits. The input HIGH voltage level at which
oscillation occurs is defined as V
IHD
.
Verify that the GND reference recorded on the oscillo-
scope has not drifted to ensure the accuracy and repeat-
ability of the measurements.
FIGURE 6. Simultaneous Switching Test Circuit
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 74ACQ646SPC | 功能描述:總線收發(fā)器 Octal Trans/Reg RoHS:否 制造商:Fairchild Semiconductor 邏輯類型:CMOS 邏輯系列:74VCX 每芯片的通道數(shù)量:16 輸入電平:CMOS 輸出電平:CMOS 輸出類型:3-State 高電平輸出電流:- 24 mA 低電平輸出電流:24 mA 傳播延遲時(shí)間:6.2 ns 電源電壓-最大:2.7 V, 3.6 V 電源電壓-最小:1.65 V, 2.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-48 封裝:Reel |
| 74ACT00 | 功能描述:NAND Gate IC 4 Channel Die 制造商:fairchild/micross components 系列:74ACT 包裝:托盤 零件狀態(tài):有效 邏輯類型:與非門 電路數(shù):4 輸入數(shù):2 特性:- 電壓 - 電源:4.5 V ~ 5.5 V 電流 - 靜態(tài)（最大值）:2μA 電流 - 輸出高，低:24mA，24mA 邏輯電平 - 低:0.8V 邏輯電平 - 高:2V 不同 V，最大 CL 時(shí)的最大傳播延遲:9ns @ 5V，- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 供應(yīng)商器件封裝:模具 封裝/外殼:模具 標(biāo)準(zhǔn)包裝:25 |
| 74ACT00B | 功能描述:邏輯門 Quad 2-Input NAND RoHS:否 制造商:Texas Instruments 產(chǎn)品:OR 邏輯系列:LVC 柵極數(shù)量:2 線路數(shù)量（輸入/輸出）:2 / 1 高電平輸出電流:- 16 mA 低電平輸出電流:16 mA 傳播延遲時(shí)間:3.8 ns 電源電壓-最大:5.5 V 電源電壓-最小:1.65 V 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DCU-8 封裝:Reel |
| 74ACT00D | 制造商:Texas Instruments 功能描述: 制造商:undefined 功能描述: |
| 74ACT00M | 功能描述:邏輯門 RO 511-74ACT00M-TR RoHS:否 制造商:Texas Instruments 產(chǎn)品:OR 邏輯系列:LVC 柵極數(shù)量:2 線路數(shù)量（輸入/輸出）:2 / 1 高電平輸出電流:- 16 mA 低電平輸出電流:16 mA 傳播延遲時(shí)間:3.8 ns 電源電壓-最大:5.5 V 電源電壓-最小:1.65 V 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:DCU-8 封裝:Reel |
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