SN74CBT34X245

32-BIT FET BUS SWITCH

SCDS089C – MAY 1999 – REVISED MAY 2001

4

POST OFFICE BOX 655303

PARAMETER MEASUREMENT INFORMATION

VOH

VOL

From Output

Under Test

CL = 50 pF

(see Note A)

LOAD CIRCUIT

S1

7 V

Open

GND

500

Ω

500

Ω

tPLH

tPHL

Output

Control

Output

Waveform 1

S1 at 7 V

(see Note B)

Output

Waveform 2

S1 at Open

(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

Input

3 V

3.5 V

VOLTAGE WAVEFORMS

PROPAGATION DELAY TIMES

VOLTAGE WAVEFORMS

ENABLE AND DISABLE TIMES

Output

tpd

tPLZ/tPZL

tPHZ/tPZH

Open

7 V

Open

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.

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

≤ 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.

E. tPLZ and tPHZ are the same as tdis.

F. tPZL and tPZH are the same as ten.

G. tPLH and tPHL are the same as tpd.

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 1. Load Circuit and Voltage Waveforms