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參數(shù)資料
| 型號： | 74ACTQ245FC |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 總線收發(fā)器 |
| 英文描述： | ACT SERIES, 8-BIT TRANSCEIVER, TRUE OUTPUT, CDFP20 |
| 封裝： | CERPACK-20 |
| 文件頁數(shù)： | 7/10頁 |
| 文件大小： | 207K |
| 代理商： | 74ACTQ245FC |
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 500X
2 Deskew the word generator so that no two channels have
greater than 150 ps skew between them This requires
that the oscilloscope be deskewed first Swap out the
channels that have more than 150 ps of skew until all
channels being used are within 150 ps It is important to
deskew the word generator channels before testing This
will ensure that the outputs switch simultaneously
3 Terminate all inputs and outputs to ensure proper loading
of the outputs and that the input levels are at the correct
voltage
4 Set VCC to 50V
5 Set the word generator to toggle all but one output at a
frequency of 1 MHz Greater frequencies will increase
DUT heating and affect the results of the measurement
TLF10236 – 5
FIGURE 8 Quiet Output Noise Voltage Waveforms
Note A
VOHV and VOLP are measured with respect to ground reference
Note B
Input pulses have the following characteristics f e 1 MHz tr e
3 ns tf e 3 ns skew k 150 ps
6 Set the word generator input levels at 0V LOW and 3V
HIGH for ACT devices and 0V LOW and 5V HIGH for AC
devices Verify levels with a digital volt meter
VOLP VOLV and VOHP VOHV
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 50X coaxial cable plugged into a standard
SMB type connector on the test fixture Do not use an
active FET probe
Measure VOLP and VOLV on the quiet output during the
HL transition Measure VOHP and VOHV on the quiet out-
put during the LH transition
Verify that the GND reference recorded on the oscillo-
scope has not drifted to ensure the accuracy and repeat-
ability of the measurements
VILD and VIHD
Monitor one of the switching outputs using a 50X 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 VIL until the
output begins to oscillate Oscillation is defined as noise
on the output LOW level that exceeds VIL limits or on
output HIGH levels that exceed VIH limits The input
LOW voltage level at which oscillation occurs is defined
as VILD
Next increase the input HIGH voltage level on the word
generator VIH until the output begins to oscillate Oscilla-
tion is defined as noise on the output LOW level that
exceeds VIL limits or on output HIGH levels that exceed
VIH limits The input HIGH voltage level at which oscilla-
tion occurs is defined as VIHD
Verify that the GND reference recorded on the oscillo-
scope has not drifted to ensure the accuracy and repeat-
ability of the measurements
TLF10236 – 6
FIGURE 9 Simultaneous Switching Test Circuit
6
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| 74ACTQ245MSA | 功能描述:總線收發(fā)器 Octal Bidir Trans 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 |
| 74ACTQ245MSA_Q | 功能描述:總線收發(fā)器 Octal Bidir Trans 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 |
| 74ACTQ245MSAX | 功能描述:總線收發(fā)器 Octal Bidir Trans 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 |
| 74ACTQ245MTC | 功能描述:總線收發(fā)器 Octal Bidir Trans 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 |
| 74ACTQ245MTCX | 功能描述:總線收發(fā)器 Octal Bidir Trans 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 |
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