CD74FCT240

BiCMOS OCTAL BUFFER/LINE DRIVER

WITH 3-STATE OUTPUTS

SCBS729 − JULY 2000

5

POST OFFICE BOX 655303

PARAMETER MEASUREMENT INFORMATION

3 V

3 V

0 V

0 V

VOLTAGE WAVEFORMS

SETUP AND HOLD TIMES

Data Input

3 V

0 V

1.5 V

1.5 V

Input

Out-of-Phase

Output

In-Phase

Output

Timing Input

VOLTAGE WAVEFORMS

PROPAGATION DELAY TIMES

INVERTING AND NONINVERTING OUTPUTS

Output

Control

Output

Waveform 1

(see Note B)

Output

Waveform 2

(see Note B)

≈3.5 V

0 V

1.5 V

1.5 V

≈0 V

3 V

VOLTAGE WAVEFORMS

ENABLE AND DISABLE TIMES

LOW- AND HIGH-LEVEL ENABLING

Open Drain

Open

7 V

Open

7 V

TEST

S1

3 V

0 V

1.5 V

VOLTAGE WAVEFORMS

PULSE DURATION

Input

B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.

Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.

C. All input pulses are supplied by generators having the following characteristics: PRR

D. The outputs are measured one at a time with one input transition per measurement.

From Output

Under Test

(see Note A)

LOAD CIRCUIT FOR

3-STATE AND OPEN-DRAIN OUTPUTS

S1

7 V

500

Ω

GND

From Output

Under Test

(see Note A)

Test

Point

LOAD CIRCUIT FOR

TOTEM-POLE OUTPUTS

Open

1.5 V

1.5 V

1.5 V

1.5 V

1.5 V

1.5 V

1.5 V

1.5 V

500

Ω

500

Ω

1.5 V

1.5 V

VOLTAGE WAVEFORM

INPUT RISE AND FALL TIMES

1.5 V

1.5 V

10%

10%

90%

90%

3 V

0 V

Figure 1. Load Circuit and Voltage Waveforms