DM74ALS14 datasheet(3/6 Pages) FAIRCHILD | Hex Inverter with Schmitt Trigger Inputs

Part #	DM74ALS14

Description	Hex Inverter with Schmitt Trigger Inputs

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

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Switching Characteristics over recommended operating free air temperature range

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 Oscillo-

scope

Procedure:

1. Verify Test Fixture Loading: Standard Load 50 pF,

500

Ω.

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 VCC 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.

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 50

Ω coaxial cable plugged into a standard

SMB type connector on the test fixture. Do not use an

active FET probe.

• 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. 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 word

generator, VIH until the output begins to oscillate. Oscil-

lation 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.

VOHV and VOHP are measured with respect to VOH reference. VOLV and

VOLPare measured with respect to ground reference.

Input pulses have the following characteristics: f

= 1 MHz, t

r = 3 ns, tf =

3 ns, skew

< 150 ps.

FIGURE 1. Quiet Output Noise Voltage Waveforms

FIGURE 2. Simultaneous Switching Test Circuit

Symbol

Parameter

Conditions

Min

Max

Units

tPLH

Propagation Delay Time LOW-to-HIGH Level Output

VCC = 4.5V to 5.5V

2

12

ns

tPHL

Propagation Delay Time HIGH-to-LOW Level Output

RL = 500Ω, CL = 50 pF

2

10

ns

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