SN54ALVTH16821, SN74ALVTH16821

2.5-V/3.3-V 20-BIT BUS-INTERFACE FLIP-FLOPS

WITH 3-STATE OUTPUTS

SCES078E – JULY 1996 – REVISED JANUARY 1999

10

POST OFFICE BOX 655303

PARAMETER MEASUREMENT INFORMATION

VOH

VOL

th

tsu

From Output

Under Test

CL = 50 pF

(see Note A)

LOAD CIRCUIT

S1

Open

GND

500

Ω

500

Ω

tPLH

tPHL

Output Control

Output

Waveform 1

S1 at 6 V

(see Note B)

Output

Waveform 2

S1 at GND

(see Note B)

tPZL

tPZH

tPLZ

tPHZ

3 V

0 V

VOH

VOL

0 V

VOL + 0.3 V

VOH – 0.3 V

≈ 0 V

3 V

0 V

0 V

tw

Input

3 V

3 V

3 V

VOLTAGE WAVEFORMS

SETUP AND HOLD TIMES

VOLTAGE WAVEFORMS

PROPAGATION DELAY TIMES

INVERTING AND NONINVERTING OUTPUTS

VOLTAGE WAVEFORMS

PULSE DURATION

VOLTAGE WAVEFORMS

ENABLE AND DISABLE TIMES

LOW- AND HIGH-LEVEL ENABLING

Timing

Input

Data

Input

Output

Input

tPLH/tPHL

tPLZ/tPZL

tPHZ/tPZH

Open

6 V

GND

TEST

S1

NOTES: A. CL includes probe and jig capacitance.

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

Waveform22 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

≤ 10 MHz, ZO = 50 Ω, tr ≤ 2.5 ns, tf ≤ 2.5 ns.

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

6 V

1.5 V

1.5 V

1.5 V

1.5 V

1.5 V

0 V

3 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

Figure 2. Load Circuit and Voltage Waveforms