74LCX138MTC datasheet(5/12 Pages) FAIRCHILD

Part #	74LCX138MTC

Description	Low Voltage 1-of-8 Decoder/Demultiplexer with 5V Tolerant Inputs

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Manufacturer	FAIRCHILD [Fairchild Semiconductor]

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AC Electrical Characteristics

Note 6: Skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device. The

specification applies to any outputs switching in the same direction, either HIGH-to-LOW (tOSHL) or LOW-to-HIGH (tOSLH).

Dynamic Switching Characteristics

Capacitance

Symbol

Parameter

TA = −40°C to +85°C, RL = 500Ω

Units

VCC = 3.3V ± 0.3V

VCC = 2.7V

VCC = 2.5V ± 0.2V

CL = 50pF

CL = 30pF

Min

Max

Min

Max

Min

Max

tPHL

Propagation Delay

1.5

6.0

1.5

7.0

1.5

7.2

ns

tPLH

An to Qn

1.5

6.0

1.5

7.0

1.5

7.2

tPHL

Propagation Delay

1.5

6.5

1.5

7.5

1.5

8.4

ns

tPLH

E3 to Qn

1.5

6.5

1.5

7.5

1.5

8.4

tPHL

Propagation Delay

1.5

6.0

1.5

7.0

1.5

7.2

ns

tPLH

E1 or E2 to Qn

1.5

6.0

1.5

7.0

1.5

7.2

tOSHL

Output to Output Skew (Note 6)

1.0

ns

tOSLH

1.0

Symbol

Parameter

Conditions

VCC

TA = 25°C

Units

(V)

Typical

VOLP

Quiet Output Dynamic Peak VOL

CL = 50 pF, VIH = 3.3V, VIL = 0V

3.3

0.8

V

CL = 30 pF, VIH = 2.5V, VIL = 0V

2.5

0.6

VOLV

Quiet Output Dynamic Valley VOL

CL = 50 pF, VIH = 3.3V, VIL = 0V

3.3

−0.8

V

CL = 30 pF, VIH = 2.5V, VIL = 0V

2.5

−0.6

Symbol

Parameter

Conditions

Typical

Units

CIN

Input Capacitance

VCC = Open, VI = 0V or VCC

7.0

pF

COUT

Output Capacitance

VCC = 3.3V, VI = 0V or VCC

8.0

pF

CPD

Power Dissipation Capacitance

VCC = 3.3V, VI = 0V or VCC, f = 10 MHz

25.0

pF

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