74ACTQ843SC datasheet(6/8 Pages) FAIRCHILD

tên linh kiện	74ACTQ843SC

Giải thích chi tiết về linh kiện	Quiet Seriesa??9-Bit Transparent Latch with 3-STATE Outputs

Download	8 Pages

Scroll/Zoom	100%

nhà sản xuất	FAIRCHILD [Fairchild Semiconductor]

Trang chủ	http://www.fairchildsemi.com

Logo

6 / 8 page

www.fairchildsemi.com

6

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

Ω.

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 1. Quiet Output Noise Voltage Waveforms

Note 10: VOHV and VOLP are measured with respect to ground reference.

Note 11: Input pulses have the following characteristics: f

= 1MHz,

tr = 3 ns, tf = 3 ns, skew < 150 ps.

VOLP/VOLV and VOHP/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

Ω 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

worst case transition for active and enable. Measure

VOHP and VOHV 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.

VILD and VIHD:

• Monitor one of the switching outputs using a 50

Ω 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 or steps out a min of 2 ns.

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 decrease the input HIGH voltage level on the, VIH,

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 VIL limits, or on output HIGH levels

that exceed VIH limits. The input HIGH voltage level at

which oscillation 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.

FIGURE 2. Simultaneous Switching Test Circuit

Số phần tương tự - 74ACTQ843SC

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
Fairchild Semiconductor	74ACTQ841	66Kb / 7P	Quiet Seriesa??10-Bit Transparent Latch with 3-STATE Outputs
	74ACTQ841	76Kb / 7P	Quiet Series 10-Bit Transparent Latch with 3-STATE Outputs
	74ACTQ841SC	66Kb / 7P	Quiet Seriesa??10-Bit Transparent Latch with 3-STATE Outputs
	74ACTQ841SC	76Kb / 7P	Quiet Series 10-Bit Transparent Latch with 3-STATE Outputs
	74ACTQ841SPC	66Kb / 7P	Quiet Seriesa??10-Bit Transparent Latch with 3-STATE Outputs

More results

Mô tả tương tự - 74ACTQ843SC

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
Fairchild Semiconductor	74ACTQ841	66Kb / 7P	Quiet Seriesa??10-Bit Transparent Latch with 3-STATE Outputs
	74ACTQ823	75Kb / 7P	Quiet Seriesa??9-Bit D-Type Flip-Flop with 3-STATE Outputs
	74ACTQ841	76Kb / 7P	Quiet Series 10-Bit Transparent Latch with 3-STATE Outputs
	74ACTQ533	93Kb / 8P	Quiet Series Octal Transparent Latch with 3-STATE Outputs
	74ACQ373	96Kb / 10P	Quiet Series??Octal Transparent Latch with 3-STATE Outputs
	74ACQ373	311Kb / 13P	Quiet Series??Octal Transparent Latch with 3-STATE Outputs
	74ACTQ827	63Kb / 7P	Quiet Seriesa??10-Bit Buffer/Line Driver with 3-STATE Outputs
National Semiconductor ...	54ACTQ841	180Kb / 8P	Quiet Series 10-Bit Transparent Latch with TRI-STATE Outputs
Fairchild Semiconductor	74ACTQ821	68Kb / 7P	Quiet Seriesa??10-Bit D-Type Flip-Flop with 3-STATE Outputs
National Semiconductor ...	54ACQ373	170Kb / 8P	Quiet Series Octal Transparent Latch with TRI-STATE Outputs

More results

74ACTQ843SC bảng dữ liệu(PDF) 6 Page - Fairchild Semiconductor

74ACTQ843SC bảng dữ liệu(HTML) 6 Page - Fairchild Semiconductor

Số phần tương tự - 74ACTQ843SC

Mô tả tương tự - 74ACTQ843SC

Html Pages

1 2 3 4 5 6 7 8

bảng dữ liệu tải về

Link URL