MC74LCX2245

LCX DATA

BR1339 — REV 3

5

MOTOROLA

CAPACITIVE CHARACTERISTICS

Symbol

Parameter

Condition

Typical

Unit

CIN

Input Capacitance

VCC = 3.3V, VI = 0V or VCC

7

pF

CI/O

Input/Output Capacitance

VCC = 3.3V, VI = 0V or VCC

8

pF

CPD

Power Dissipation Capacitance

10MHz, VCC = 3.3V, VI = 0V or VCC

25

pF

WAVEFORM 1 – PROPAGATION DELAYS

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

2.7V

0V

VOH

VOL

An, Bn

Bn, An

tPHL

tPLH

WAVEFORM 2 – OUTPUT ENABLE AND DISABLE TIMES

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

2.7V

0V

≈ 0V

OE, T/R

An, Bn

tPZH

≈ 3.0V

tPHZ

tPZL

tPLZ

An, Bn

1.5V

1.5V

1.5V

1.5V

1.5V

1.5V

Figure 3. AC Waveforms

1.5V

VCC

VOH – 0.3V

VOL + 0.3V

GND

1.5V

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 4. Test Circuit