54AC11240, 74AC11240

OCTAL BUFFERS/LINE DRIVERS

WITH 3-STATE OUTPUTS

SCAS169 – MAY 1987 – REVISED APRIL 1993

POST OFFICE BOX 655303

2–4

switching characteristics over recommended operating free-air temperature range,

PARAMETER

FROM

TO

TA = 25°C

54AC11240

74AC11240

UNIT

PARAMETER

(INPUT)

(OUTPUT)

MIN

TYP

MAX

MIN

MAX

MIN

MAX

UNIT

tPLH

A

Y

1.5

5.4

7.5

1.5

9

1.5

8.4

ns

tPHL

A

Y

1.5

4.6

6.6

1.5

7.8

1.5

7.2

ns

tPZH

G

Y

1.5

5.7

8.2

1.5

9.9

1.5

9.2

ns

tPZL

G

Y

1.5

5.3

7.7

1.5

9.4

1.5

8.7

ns

tPHZ

G

Y

1.5

4.7

6.3

1.5

6.9

1.5

6.6

ns

tPLZ

G

Y

1.5

5.2

7.3

1.5

8

1.5

7.7

ns

PARAMETER

TEST CONDITIONS

TYP

UNIT

C d

Power dissipation capacitance per buffer

Outputs enabled

CL =50 pF

f=1MHz

39

pF

Cpd

Power dissipation capacitance per buffer

Outputs disabled

CL = 50 pF,

f = 1 MHz

12

pF

PARAMETER MEASUREMENT INFORMATION

From Output

Under Test

CL = 50 pF

(see Note A)

LOAD CIRCUIT

S1

2

× VCC

500

Ω

500

Ω

tPHL

tPLH

Output

Control

(low-level

enabling)

Output

Waveform 1

S1 at 2

× VCC

(see Note C)

Output

Waveform 2

S1 at GND

(see Note C)

VOL

VOH

tPZL

tPZH

tPLZ

tPHZ

50%

50%

50%

50%

[ VCC

VCC

0 V

50% VCC

50% VCC

VOH

VOL

0 V

50% VCC

20% VCC

50% VCC

80% VCC

[ 0 V

VCC

GND

Open

Input

(see Note B)

Output

VOLTAGE WAVEFORMS

VOLTAGE WAVEFORMS

tPLH /tPHL

tPLZ /tPZL

tPHZ /tPZH

Open

2

× VCC

GND

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 = 3 ns, tf = 3 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 input transition per measurement.

Figure 1. Load Circuit and Voltage Waveforms