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MC14008BF

4-Bit Full Adder

ON Semiconductor 

MC14008B

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ SWITCHING CHARACTERISTICS (7.) (CL = 50 pF, TA = 25_C)

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Characteristic

VDD

Symbol

Vdc

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Output Rise and Fall Time

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ tTLH, tTHL = (1.5 ns/pF) CL + 25 ns

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ tTLH, tTHL = (0.75 ns/pF) CL + 12.5 ns

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ tTLH, tTHL = (0.55 ns/pF) CL + 9.5 ns

Propagation Delay Time

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Sum in to Sum Out

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ tPLH, tPHL = (1.7 ns/pF) CL + 315 ns

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ tPLH, tPHL = (0.66 ns/pF) CL + 127 ns

tPLH, tPHL = (0.5 ns/pF) CL + 90 ns

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Sum In to Carry Out

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ tPLH, tPHL = (1.7 ns/pF) CL + 220 ns

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ tPLH, tPHL = (0.66 ns/pF) CL + 112 ns

tPLH, tPHL = (0.5 ns/pF) CL + 85 ns

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Carry In to Sum Out

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ tPLH, tPHL = (1.7 ns/pF) CL + 290 ns

tPLH, tPHL = (0.66 ns/pF) CL + 122 ns

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ tPLH, tPHL = (0.5 ns/pF) CL + 90 ns

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ Carry In to Carry Out

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ tPLH, tPHL = (1.7 ns/pF) CL + 85 ns

tPLH, tPHL = (0.66 ns/pF) CL + 42 ns

ÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎÎ tPLH, tPHL = (0.5 ns/pF) CL + 30 ns

tTLH,

tTHL

5.0

10

15

tPLH, tPHL

5.0

10

15

5.0

10

15

5.0

10

15

5.0

10

15

Min

Typ (8.)

Max

Unit

ns

—

100

200

—

50

100

—

40

80

ns

—

400

800

—

160

320

—

115

230

—

305

610

—

145

290

—

110

220

—

375

750

—

155

310

—

115

230

—

170

340

—

75

150

—

55

110

7. The formulas given are for the typical characteristics only at 25_C.

8. Data labelled “Typ” is not to be used for design purposes but is intended as an indication of the IC’s potential performance.

VDD = – VGS

16

B4 S4

A4

B3 S3

A3

B2 S2

A2

B1 S1

A1

Cin Cout

8 VSS

Vout

IOH

EXTERNAL

POWER

SUPPLY

Figure 1. Typical Source Current

Characteristics Test Circuit

VDD = VGS

16

B4 S4

A4

B3 S3

A3

B2 S2

A2

B1 S1

A1

Cin Cout

8 VSS

Vout

IOL

EXTERNAL

POWER

SUPPLY

Figure 2. Typical Sink Current

Characteristics Test Circuit

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4

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