3 V

3 V

0 V

0 V

VOLTAGE WAVEFORMS

SETUP AND HOLD TIMES

Data Input

3 V

0 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

S1 at GND

(see Note B)

0 V

≈0 V

3 V

VOLTAGE WAVEFORMS

ENABLE AND DISABLE TIMES

LOW- AND HIGH-LEVEL ENABLING

Open Drain

Open

GND

TEST

S1

3 V

0 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.

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

E. All parameters and waveforms are not applicable to all devices.

From Output

Under Test

(see Note A)

LOAD CIRCUIT FOR

3-STATE AND OPEN-DRAIN OUTPUTS

S1

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

1.5 V

SN54AHCT14, SN74AHCT14

www.ti.com

SCLS246Q – OCTOBER 1995 – REVISED JULY 2014

8 Parameter Measurement Information

Figure 2. Load Circuit and Voltage Waveforms

Copyright © 1995–2014, Texas Instruments Incorporated

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