- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄376782 > DM74ALS5245WM (FAIRCHILD SEMICONDUCTOR CORP) 10-Bit Buffer/Driver With 3-State Outputs 24-SSOP -40 to 85 PDF資料下載
參數(shù)資料
| 型號(hào)： | DM74ALS5245WM |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類(lèi)： | 通用總線功能 |
| 英文描述： | 10-Bit Buffer/Driver With 3-State Outputs 24-SSOP -40 to 85 |
| 中文描述： | ALS SERIES, 8-BIT TRANSCEIVER, TRUE OUTPUT, PDSO20 |
| 封裝： | 0.300 INCH, MS-150AE, SOIC-20 |
| 文件頁(yè)數(shù)： | 4/7頁(yè) |
| 文件大?。?/td> | 78K |
| 代理商： | DM74ALS5245WM |
www.fairchildsemi.com
4
D
ALS 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 ALS.
Equipment:
Word Generator
Printed Circuit Board Test Fixture
Dual Trace Oscilloscope
Procedure:
1. Verify Test Fixture Loading: Standard Load 50 pF,
500
.
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 load-
ing of the outputs and that the input levels are at the
correct voltage.
4. Set V
CC
to 5.0V.
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 measure-
ment.
6. Set the word generator input levels at 0V LOW and 3V
HIGH. Verify levels with a digital volt meter.
FIGURE 1. Quiet Output Noise Voltage Waveforms
Note 5:
V
OHV
and V
OHP
are measured with respect to V
OH
reference. V
OLV
and V
OLP
are measured with respect to ground reference.
Note 6:
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
HL transition. Measure V
OHP
and V
OHV
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.
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. 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 on the word
generator, V
IH
until the output begins to oscillate. Oscil-
lation 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 oscilla-
tion 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 2. Simultaneous Switching Test Circuit
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| DM74ALS5245WMX | 10-Bit Buffer/Driver With 3-State Outputs 24-SSOP -40 to 85 |
| DM74ALS533 | Octal D-Type Transparent Latch with 3-STATE Outputs(八D型通用鎖存器（三態(tài)輸出）) |
| DM74ALS533WMX | 8-Bit D-Type Latch |
| DM74ALS533N | 10-Bit Buffer/Driver With 3-State Outputs 24-TVSOP -40 to 85 |
| DM74ALS533WM | Octal D-Type Transparent Latch with 3-STATE Outputs |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DM74ALS5245WMX | 功能描述:總線收發(fā)器 Octal 3-STATE Trans RoHS:否 制造商:Fairchild Semiconductor 邏輯類(lèi)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(lèi)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 |
| DM74ALS533N | 功能描述:閉鎖 Oct D-Tp Trans Latch RoHS:否 制造商:Micrel 電路數(shù)量:1 邏輯類(lèi)型:CMOS 邏輯系列:TTL 極性:Non-Inverting 輸出線路數(shù)量:9 高電平輸出電流: 低電平輸出電流: 傳播延遲時(shí)間: 電源電壓-最大:12 V 電源電壓-最小:5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-16 封裝:Reel |
| DM74ALS533N_Q | 功能描述:閉鎖 Oct D-Tp Trans Latch RoHS:否 制造商:Micrel 電路數(shù)量:1 邏輯類(lèi)型:CMOS 邏輯系列:TTL 極性:Non-Inverting 輸出線路數(shù)量:9 高電平輸出電流: 低電平輸出電流: 傳播延遲時(shí)間: 電源電壓-最大:12 V 電源電壓-最小:5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-16 封裝:Reel |
| DM74ALS533WM | 功能描述:閉鎖 Oct D-Tp Trans Latch RoHS:否 制造商:Micrel 電路數(shù)量:1 邏輯類(lèi)型:CMOS 邏輯系列:TTL 極性:Non-Inverting 輸出線路數(shù)量:9 高電平輸出電流: 低電平輸出電流: 傳播延遲時(shí)間: 電源電壓-最大:12 V 電源電壓-最小:5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-16 封裝:Reel |
| DM74ALS533WM_Q | 功能描述:閉鎖 Oct D-Tp Trans Latch RoHS:否 制造商:Micrel 電路數(shù)量:1 邏輯類(lèi)型:CMOS 邏輯系列:TTL 極性:Non-Inverting 輸出線路數(shù)量:9 高電平輸出電流: 低電平輸出電流: 傳播延遲時(shí)間: 電源電壓-最大:12 V 電源電壓-最小:5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-16 封裝:Reel |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。