SN54ACT1284, SN74ACT1284

7BIT BUS INTERFACES

WITH 3STATE OUTPUTS

SCAS459D − NOVEMBER 1994 − REVISED OCTOBER 2003

4

POST OFFICE BOX 655303

electrical characteristics over recommended ranges of operating free-air temperature and supply

voltage (unless otherwise noted)

PARAMETER

TEST CONDITIONS

VCC†

SN54ACT1284

SN74ACT1284

UNIT

PARAMETER

TEST CONDITIONS

VCC†

MIN

TYP

MAX

MIN

TYP

MAX

UNIT

Vhys

Input

VIT+ − VIT− for all inputs

5 V

0.4

0.4

V

Vhys

Input

hysteresis

VIT+ − VIT− for all inputs

4.7 V

0.2

0.2

V

B port

IOH = −14 mA

4.7 V

2.4

2.4

VOH

A port

IOH = −50 µA

MIN

to MAX

VCC−0.2

VCC −0.2

V

A port

IOH = −4 mA

4.7 V

3.7

3.7

B port

IOL = 14 mA

4.7 V

0.4

0.4

VOL

A port

IOL = 50 µA

4.7 V

0.2

0.2

V

VOL

A port

IOL = 4 mA

4.7 V

0.4

0.4

V

II

VI = VCC or GND

5.5 V

±1

±1

µA

IOZ

A or B ports‡

VO = VCC or GND

5.5 V

±20

±20

µA

Ioff

B port

VI or VO ≤ 7 V

0 V

±100

±100

µA

ICC

VI = VCC or GND,

IO = 0

5.5 V

1.5

1.5

mA

Ci

Control inputs

VI = VCC or GND

5 V

4

4

pF

Cio

A or B ports

VO = VCC or GND

5 V

12

12

pF

ZO

B port

IOH = −20 mA,

IOH = −50 mA

5 V

8

30

8

30

Ω

† For I/O ports, the parameter IOZ includes the input leakage current II.

‡ For conditions shown as MIN or MAX, use the appropriate values under recommended operating conditions.

switching characteristics over recommended ranges of supply voltage and operating free-air

temperature (unless otherwise noted) (see Figure 1)

PARAMETER

FROM

TO

SN54ACT1284

SN74ACT1284

UNIT

PARAMETER

FROM

(INPUT)

TO

(OUTPUT)

MIN

MAX

MIN

MAX

UNIT

tPLH

Totem pole

A or B

B or A

1

20

1

20

ns

tPHL

Totem pole

A or B

B or A

1

20

1

20

ns

SR

Totem pole

B output

0.05

0.4

0.05

0.4

V/ns

tpd(EN)

Totem pole

HD

B

1

20

1

20

ns

tpd(DIS)

Totem pole

HD

B

1

20

1

20

ns

tr, tf

Open drain

A

B

120

120

ns

PRODUCT PREVIEW information concerns products in the formative or

design phase of development. Characteristic data and other

specifications are design goals. Texas Instruments reserves the right to

change or discontinue these products without notice.