CD74FCT540M datasheet(6/7 Pages) TI

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8-6

Test Circuits and Waveforms

NOTE:

8. Pulse Generator for All Pulses: Rate

≤ 1.0MHz; ZOUT ≤ 50Ω;

tf, tr ≤ 2.5ns.

FIGURE 1. TEST CIRCUIT

FIGURE 2. ENABLE AND DISABLE TIMING

FIGURE 3. PROPAGATION DELAY

NOTES:

9. VOLP is measured with respect to a ground reference near the output under test. VOHV is measured with respect to VOH.

10. Input pulses have the following characteristics:

PRR ≤ 1MHz, tr = 2.5ns, tf = 2.5ns, skew 1ns.

11. R.F. fixture with 700MHz design rules required. IC should be soldered into test board and bypassed with 0.1

µF capacitor. Scope and

probes require 700MHz bandwidth.

FIGURE 4. SIMULTANEOUS SWITCHING TRANSIENT WAVEFORMS

DUT

PULSE ZO

GEN

500

Ω

50pF

500

Ω

VCC

RT = ZO

tr, tf = 2.5ns

(NOTE 8)

SWITCH POSITION

TEST

SWITCH

tPLZ, tPZL, Open Drain

Closed

tPHZ, tPZH, tPLH, tPHL

Open

DEFINITIONS:

CL = Load capacitance, includes jig and probe

capacitance.

RT = Termination resistance, should be equal to ZOUT of

the Pulse Generator.

VIN = 0V to 3V.

Input: tr =tf = 2.5ns (10% to 90%), unless otherwise specified

1.5V

CONTROL INPUT

OUTPUT

NORMALLY LOW

OUTPUT

NORMALLY HIGH

SWITCH

OPEN

tPZL

3.5V

1.5V

tPLZ

tPHZ

tPZH

3.5V

0.3V

VOL

VOH

SWITCH

CLOSED

ENABLE

DISABLE

1.5V

tPLH

SAME PHASE

INPUT TRANSITION

tPHL

tPLH

tPHL

OPPOSITE PHASE

INPUT TRANSITION

OUTPUT

1.5V

VOH

VOL

OTHER

OUTPUTS

OUTPUT

UNDER

TEST

VOH

VOL

VOH

VOHV

VOLP

VOL

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