MC74LCX574

LCX DATA

BR1339 — REV 3

5

MOTOROLA

WAVEFORM 3 – PULSE WIDTH

tR = tF = 2.5ns (or fast as required) from 10% to 90%;

Output requirements: VOL ≤ 0.8V, VOH ≥ 2.0V

2.7V

0V

2.7V

0V

1.5V

1.5V

Figure 1. AC Waveforms

tw

1.5V

1.5V

tw

WAVEFORM 2 – OUTPUT ENABLE AND DISABLE TIMES

tR = tF = 2.5ns, 10% to 90%; f = 1MHz; tW = 500ns

2.7V

0V

≈ 0V

OE

On

tPZH

≈ 3.0V

tPHZ

tPZL

tPLZ

On

1.5V

1.5V

1.5V

VCC

VOH – 0.3V

VOL + 0.3V

GND

1.5V

CP

CP

WAVEFORM 1 – PROPAGATION DELAYS, SETUP AND HOLD TIMES

tR = tF = 2.5ns, 10% to 90%; f = 1MHz; tW = 500ns

2.7V

0V

Dn

CP

1.5V

On

2.7V

0V

VOH

VOL

tPLH, tPHL

th

ts

1.5V

1.5V

fmax

OPEN

PULSE

GENERATOR

RT

DUT

VCC

RL

R1

CL

6V

GND

TEST

SWITCH

tPLH, tPHL

Open

tPZL, tPLZ

6V

Open Collector/Drain tPLH and tPHL

6V

tPZH, tPHZ

GND

CL = 50pF or equivalent (Includes jig and probe capacitance)

RL = R1 = 500Ω or equivalent

RT = ZOUT of pulse generator (typically 50Ω)

Figure 2. Test Circuit