PARAMETER

SYMBOL

TEST CONDITIONS

VCC (V)

25°C

-40°C TO 85°C

-55°C TO

125°C

UNIT

VI (V)

IO (mA)

MIN

MAX

MIN

MAX

MIN

MAX

Quiescent Supply Current

MSI

ICC

VCC or

GND

0

5.5

-

8

-

80

-

160

μA

Additional Supply Current

per Input Pin TTL Inputs

High 1 Unit Load

ΔICC

VCC -2.1

-

4.5 to

5.5

-

2.4

-

2.8

-

3

mA

(1)

Test one output at a time for a 1-second maximum duration. Measurement is made by forcing current and measuring voltage to

minimize power dissipation.

(2)

Test verifies a minimum 50Ω transmission-line-drive capability at 85°C, 75Ω at 125°C.

Table 4-1. ACT Input Load

Table

INPUT

UNIT LOAD

Data

0.83

S

1.27

OE

1.27

Note

Unit load is ΔICC limit specified in DC Electrical Specifications Table, e.g., 2.4mA max at 25°C.

4.5 Switching Specifications

Input tr, tf = 3ns, CL = 50pF (Worst Case)

PARAMETER

SYMBOL

VCC (V)

-40°C TO 85°C

-55°C TO 125°C

UNITS

MIN

TYP

MAX

MIN

TYP

MAX

AC TYPES

Propagation Delay, In to Y AC/

ACT257

tPLH, tPHL

1.5

-

-

106

-

-

117

ns

3.3 (1)

3.3

-

11.8

3.3

-

13

ns

5(2)

2.4

-

8.5

2.3

-

9.3

ns

Propagation Delay, S to Y AC/

ACT257

tPLH, tPHL

1.5

-

-

153

-

-

168

ns

3.3

4.8

-

17.1

4.7

-

18.8

ns

5

3.5

-

12.2

3.4

-

13.4

ns

Propagation Delay, OE to Y AC/

ACT257

tPLZ, tPHZ, tPZL,

tPZH

1.5

-

-

167

-

-

184

ns

3.3

5.3

-

18.7

5.2

-

20.6

ns

5

3.8

-

13.4

3.7

-

14.7

ns

Propagation Delay, In to Y ’AC/

CD74ACT258

tPLH, tPHL

1.5

-

-

91

-

-

100

ns

3.3

2.9

-

10.2

2.8

-

11.2

ns

5

2.1

-

7.3

2

-

8

ns

Propagation Delay, S to Y ’AC/

CD74ACT258

tPLH, tPHL

1.5

-

-

153

-

-

168

ns

3.3

4.8

-

17.1

4.7

-

18.8

ns

5

3.5

-

12.2

3.4

-

13.4

ns

Propagation Delay, OE to Y ’AC/

CD74ACT258

tPLZ, tPHZ, tPZL,

tPZH

1.5

-

-

167

-

-

184

ns

3.3

5.3

-

18.7

5.2

-

20.6

ns

5

3.8

-

13.4

3.7

-

14.7

ns

Three-State Output Capacitance CO

-

-

-

15

-

-

15

pF

Input Capacitance

CI

-

-

-

10

-

-

10

pF

Power Dissipation Capacitance

CPD (3)

-

-

130

-

-

130

-

pF

ACT TYPES

CD54AC257, CD74AC257, CD54ACT257, CD74ACT257, CD74ACT258

SCHS248C – NOVEMBER 1998 – REVISED APRIL 2025

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