MC14518B_14 datasheet(4/7 Pages) ONSEMI

No de pièce	MC14518B

Description	Dual Up Counters

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Fabricant	ONSEMI [ON Semiconductor]

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MC14518B, MC14520B

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4

SWITCHING CHARACTERISTICS (Note 6) (CL = 50 pF, TA = 25_C)

Characteristic

Symbol

VDD

All Types

Unit

Min

Typ

(Note 7)

Max

Output Rise and Fall Time

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

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

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

tTLH,

tTHL

5.0

10

15

−

100

50

40

200

100

80

ns

Propagation Delay Time

Clock to Q/Enable to Q

tPLH, tPHL = (1.7 ns/pF) CL + 215 ns

tPLH, tPHL = (0.66 ns/pF) CL + 97 ns

tPLH, tPHL = (0.5 ns/pF) CL + 75 ns

Reset to Q

tPHL = (1.7 ns/pF) CL + 265 ns

tPHL = (0.66 ns/pF) CL + 117 ns

tPHL = (0.66 ns/pF) CL + 95 ns

tPLH,

tPHL

5.0

10

15

−

280

115

80

560

230

160

ns

tPHL

5.0

10

15

−

330

130

90

650

230

170

ns

Clock Pulse Width

tw(H)

tw(L)

5.0

10

15

200

100

70

100

50

35

−

ns

Clock Pulse Frequency

fcl

5.0

10

15

−

2.5

6.0

8.0

1.5

3.0

4.0

MHz

Clock or Enable Rise and Fall Time

tTHL, tTLH

5.0

10

15

−

15

5

4

μs

Enable Pulse Width

tWH(E)

5.0

10

15

440

200

140

220

100

70

−

ns

Reset Pulse Width

tWH(R)

5.0

10

15

280

120

90

125

55

40

−

ns

Reset Removal Time

trem

5.0

10

15

– 5

15

20

– 45

– 15

– 5

−

ns

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

_C.

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

Figure 1. Power Dissipation Test Circuit and Waveform

PULSE

GENERATOR

VARIABLE

WIDTH

CL

VDD

VSS

500

μF

0.01

μF

CERAMIC

20 ns

50%

10%

90%

20 ns

ID

Q3

Q2

Q1

Q0

C

E

R

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