SN54ABT18652, SN74ABT18652

SCAN TEST DEVICES WITH

18-BIT BUS TRANSCEIVERS AND REGISTERS

SCBS132A – AUGUST 1992 – REVISED OCTOBER 1992

10

POST OFFICE BOX 655303

PARAMETER MEASUREMENT INFORMATION

1.5 V

th

tsu

From Output

Under Test

CL = 50 pF

LOAD CIRCUIT FOR OUTPUTS

S1

7 V

Open

GND

500

Ω

500

Ω

Data Input

Timing Input

1.5 V

3 V

0 V

1.5 V

1.5 V

3 V

0 V

3 V

0 V

1.5 V

1.5 V

tw

Input

(see Note A)

VOLTAGE WAVEFORMS

SETUP AND HOLD TIMES

VOLTAGE WAVEFORMS

PROPAGATION DELAY TIMES

INVERTING AND NON-INVERTING OUTPUTS

VOLTAGE WAVEFORMS

PULSE DURATION

tPLH

tPHL

tPHL

tPLH

VOH

VOH

VOL

VOL

1.5 V

1.5 V

3 V

0 V

1.5 V

1.5 V

Input

(see Note B)

1.5 V

Output

Control

Output

Waveform 1

S1 at 7 V

(see Note C)

Output

Waveform 2

S1 at Open

(see Note C)

VOL

VOH

tPZL

tPZH

tPLZ

tPHZ

1.5 V

1.5 V

3.5 V

0 V

1.5 V

VOL + 0.3 V

1.5 V

VOH – 0.3 V

[ 0 V

3 V

VOLTAGE WAVEFORMS

ENABLE AND DISABLE TIMES

LOW- AND HIGH-LEVEL ENABLING

Output

Output

tPLH/tPHL

tPLZ/tPZL

tPHZ/tPZH

Open

7 V

Open

TEST

S1

NOTES: A. CL includes probe and jig capacitance.

B. 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.

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.

Figure 2. Load Circuit and Voltage Waveforms