SN74CBT3251

1OF8 FET MULTIPLEXER/DEMULTIPLEXER

SCDS019L − MAY 1995 − REVISED JANUARY 2004

4

POST OFFICE BOX 655303

(unless otherwise noted) (see Figure 1)

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

VCC = 4 V

VCC = 5 V

± 0.5 V

UNIT

PARAMETER

(INPUT)

(OUTPUT)

MIN

MAX

MIN

MAX

UNIT

tpd†

A or B

B or A

0.35

0.25

ns

tpd

S

A

6

2

5.5

ns

ten

S

B

6.4

1.5

5.6

ns

ten

OE

A or B

6.4

1.6

5.8

ns

tdis

S

B

6.8

1.9

6.4

ns

tdis

OE

A or B

6

2.3

6.2

ns

† The propagation delay is the calculated RC time constant of the typical on-state resistance of the switch and the specified load capacitance, when

driven by an ideal voltage source (zero output impedance).

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.

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

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