5-407

FAST AND LS TTL DATA

SN54/74LS249

GUARANTEED OPERATING RANGES

Symbol

Parameter

Min

Typ

Max

Unit

VCC

Supply Voltage

54

74

4.5

4.75

5.0

5.0

5.5

5.25

V

TA

Operating Ambient Temperature Range

54

74

– 55

0

25

25

125

70

°C

IOH

Output Current — High

BI / RBO

54, 74

– 50

µA

IOL

Output Current — Low

BI / RBO

Output Current — Low

BI / RBO

54

74

1.6

3.2

mA

VOH

Output Voltage — High

a – g

54, 74

5.5

V

IOL

Output Current — Low

a – g

Output Current — Low

a – g

54

74

4.0

8.0

mA

Symbol

Parameter

Limits

Unit

Test Conditions

Symbol

Parameter

Min

Typ

Max

Unit

Test Conditions

VIH

Input HIGH Voltage

2.0

V

Guaranteed Input HIGH Voltage for

All Inputs

VIL

Input LOW Voltage

54

0.7

V

Guaranteed Input LOW Voltage for

All Inputs

VIL

Input LOW Voltage

74

0.8

V

Guaranteed Input LOW Voltage for

All Inputs

VIK

Input Clamp Diode Voltage

– 0.65

– 1.5

V

VCC = MIN, IIN = – 18 mA

VOH

Output HIGH Voltage

BI / RBO

54

2.4

4.2

V

VCC = MIN, IOH = MAX, VIN = VIH

or VIL per Truth Table

VOH

Output HIGH Voltage

BI / RBO

74

2.4

4.2

V

VCC = MIN, IOH = MAX, VIN = VIH

or VIL per Truth Table

IOH

Output HIGH Current

a – g

54, 74

250

µA

VCC = MIN, VIH = 2.0 V,

VOH = 5.5 V, VIL = MAX

VOL

Output LOW Voltage

BI / RBO

54, 74

0.25

0.4

V

IOL = 1.6 mA

VCC = MIN, VIH = 2.0 V,

VIL = per Truth Table

VOL

74

0.35

0.5

V

IOL = 3.2 mA

VCC = MIN, VIH = 2.0 V,

VIL = per Truth Table

VOL

a – g

54, 74

0.25

0.4

V

IOL = 4.0 mA

VIL = per Truth Table

74

0.35

0.5

V

IOL = 8.0 mA

IIH

Input HIGH Current

Any Input, except BI / RBO

20

µA

VCC = MAX, VIN = 2.7 V

IIH

Input HIGH Current

Any Input, except BI / RBO

0.1

mA

VCC = MAX, VIN = 7.0 V

IIL

Input LOW Current

Any Input, except BI / RBO

– 0.4

mA

VCC = MAX, VIN = 0.4 V

IIL

BI / RBO

– 1.2

mA

VCC = MAX, VIN = 0.4 V

IOS

Short Circuit Current

BI / RBO (Note 1)

– 0.3

– 2.0

mA

VCC = MAX

ICC

Power Supply Current

8.0

15

mA

VCC = MAX

Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.

Symbol

Parameter

Limits

Unit

Test Conditions

Symbol

Parameter

Min

Typ

Max

Unit

Test Conditions

tPHL

tPLH

Propagation Delay Time, High-to-Low-Level Output from A Input

Propagation Delay Time, Low-to-High-Level Output from A Input

100

100

ns

CL = 15 pF, RL = 2.0 Ω

tPHL

tPLH

Propagation Delay Time, High-to-Low-Level Output from RBI Input

Propagation Delay Time, Low-to-High-Level Output from RBI Input

100

100

ns

CL = 15 pF, RL = 6.0 Ω