SN54BCT2244, SN74BCT2244

OCTAL BUFFERS AND LINE/MOS DRIVERS

WITH 3-STATE OUTPUTS

SCBS017D − SEPTEMBER 1988 − REVISED MARCH 2003

5

POST OFFICE BOX 655303

POST OFFICE BOX 1443

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

C. 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 transition per measurement.

E. When measuring propagation delay times of 3-state outputs, switch S1 is open.

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

From Output

Under Test

Test

Point

R1

(see Note A)

LOAD CIRCUIT FOR

TOTEM-POLE OUTPUTS

LOAD CIRCUIT FOR

3-STATE AND OPEN-COLLECTOR OUTPUTS

R1

S1

Open

(all others)

From Output

Under Test

Test

Point

R2

(see Note A)

1.5 V

1.5 V

1.5 V

3 V

3 V

0 V

0 V

VOLTAGE WAVEFORMS

SETUP AND HOLD TIMES

Timing Input

(see Note B)

Data Input

(see Note B)

1.5 V

1.5 V

3 V

3 V

0 V

0 V

High-Level

Pulse

(see Note B)

Low-Level

Pulse

VOLTAGE WAVEFORMS

PULSE DURATION

1.5 V

1.5 V

Input

(see Note B)

Out-of-Phase

Output

(see Note D)

1.5 V

1.5 V

1.5 V

1.5 V

1.5 V

1.5 V

3 V

0 V

In-Phase

Output

(see Note D)

VOLTAGE WAVEFORMS

PROPAGATION DELAY TIMES (see Note D)

0.3 V

1.5 V

1.5 V

1.5 V

1.5 V

3 V

0 V

Output

Control

(low-level enable)

Waveform 1

(see Notes C and D)

Waveform 2

(see Notes C and D)

0 V

3.5 V

0.3 V

VOLTAGE WAVEFORMS

ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS

Figure 1. Load Circuit and Voltage Waveforms