HD74LS251 datasheet(3/6 Pages) RENESAS

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HD74LS251

Rev.3.00, Jul.15.2005, page 3 of 5

Recommended Operating Conditions

Item

Symbol

Min

Typ

Max

Unit

Supply voltage

VCC

4.75

5.00

5.25

IOH

—

–2.6

Output current

IOL

—

Operating temperature

Topr

–20

°C

Electrical Characteristics

(Ta = –20 to +75 °C)

Item

Symbol

min.

typ.*

max.

Unit

Condition

VIH

2.0

—

Input voltage

VIL

—

0.8

VOH

2.4

—

VCC = 4.75 V, VIH = 2 V, VIL = 0.8 V,

IOH = –2.6 mA

—

0.4

IOL = 4 mA

Output voltage

VOL

—

0.5

IOL = 8 mA

VCC = 4.75 V, VIH = 2 V,

VIL = 0.8 V

IIH

—

µA

VCC = 5.25 V, VI = 2.7 V

IIL

—

–0.4

VCC = 5.25 V, VI = 0.4 V

Input current

—

0.1

VCC = 5.25 V, VI = 7 V

—

VO = 2.7 V

Output current

IOZ

—

–20

µA

VO = 0.4 V

VCC = 5.25 V, VIH = 2 V

Short-circuit output

current

IOS

–30

—

–130

VCC = 5.25 V

—

6.1

Condition A

Supply current**

ICC

—

7.1

Condition B

VCC = 5.25 V

Input clamp voltage

VIK

—

–1.5

VCC = 4.75 V, IIN = –18 mA

Notes: * VCC = 5 V, Ta = 25°C

** ICC is measured with the outputs open and all data and select inputs at 4.5 V under the following conditions.

A; Strobe grounded, B; Strove at 4.5 V

Switching Characteristics

(VCC = 5 V, Ta = 25°C)

Item

Symbol

Inputs

Outputs

min.

typ.

max.

Unit

Condition

tPLH

—

tPHL

A, B, C

(4 level)

—

tPLH

—

tPHL

A, B, C

(3 level)

—

tPLH

—

tPHL

Data

—

tPLH

—

Propagation delay time

tPHL

Data

—

tZH

—

tZL

Strobe

—

tZH

—

Output enable time

tZL

Strobe

—

CL = 15 pF,

RL = 2 k

Ω

tHZ

—

tLZ

Strobe

—

tHZ

—

Output disable time

tLZ

Strobe

—

CL = 5 pF,

RL = 2 k

Ω

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