MOTOROLA MC14490P, MC14490DW, MC14490DWR2, MC14490FEL, MC14490FL1 Datasheet

...

 Semiconductor Components Industries, LLC, 2000

May, 2000 – Rev. 4

1 Publication Order Number:

MC14490/D

MC14490

Hex Contact Bounce Eliminator

The MC14490 is constructed with complementary MOS enhancement mode devices, and is used for the elimination of extraneous level changes that result when interfacing with mechanical contacts. The digital contact bounce eliminator circuit takes an input signal from a bouncing contact and generates a clean digital signal four clock periods after the input has stabilized. The bounce eliminator circuit will remove bounce on both the “make” and the “break” of a contact closure. The clock for operation of the MC14490 is derived from an internal R–C oscillator which requires only an external capacitor to adjust for the desired operating frequency (bounce delay). The clock may also be driven from an external clock source or the oscillator of another MC14490 (see Figure 5).

NOTE: Immediately after power–up, the outputs of the MC14490 are in indeterminate states.

• Diode Protection on All Inputs

• Six Debouncers Per Package

• Internal Pullups on All Data Inputs

• Can Be Used as a Digital Integrator, System Synchronizer, or Delay

Line

• Internal Oscillator (R–C), or External Clock Source

• TTL Compatible Data Inputs/Outputs

• Single Line Input, Debounces Both “Make” and “Break” Contacts

• Does Not Require “Form C” (Single Pole Double Throw) Input

Signal

• Cascadable for Longer Time Delays

• Schmitt Trigger on Clock Input (Pin 7)

• Supply Voltage Range = 3.0 V to 18 V

• Chip Complexity: 546 FETs or 136.5 Equivalent Gates

MAXIMUM RATINGS (Voltages Referenced to V

) (Note 2.)

Symbol Parameter Value Unit

DC Supply Voltage Range –0.5 to +18.0 V

Vin, V

out

Input or Output Voltage Range

(DC or Transient)

–0.5 to VDD + 0.5 V

Input Current

(DC or Transient) per Pin

±10 mA

Power Dissipation,

per Package (Note 3.)

500 mW

Ambient Temperature Range –55 to +125 °C

stg

Storage Temperature Range –65 to +150 °C

Lead Temperature

(8–Second Soldering)

260 °C

2. Maximum Ratings are those values beyond which damage to the device

may occur.

3. Temperature Derating:

Plastic “P and D/DW” Packages: – 7.0 mW/_C From 65_C T o 125_C

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A = Assembly Location WL or L = Wafer Lot YY or Y = Year WW or W = Work Week

Device Package Shipping

ORDERING INFORMATION

MC14490DW SOIC–16 47/Rail MC14490DWR2 SOIC–16 1000/Tape & Reel MC14490F SOEIAJ–16 See Note 1.

1. For ordering information on the EIAJ version of the SOIC packages, please contact your local ON Semiconductor representative.

MARKING

DIAGRAMS

PDIP–16

P SUFFIX

CASE 648

MC14490P

AWLYYWW

MC14490FEL SOEIAJ–16 See Note 1. MC14490P PDIP–16 25/Rail

SOIC–16 DW SUFFIX CASE 751G

14490

AWLYYWW

This device contains protection circuitry to guard against damage due to high static voltages or electric fields. However, precautions must be taken to avoid applications of any voltage higher than maximum rated voltages to this high–impedance circuit. For proper operation, V

and V

out

should be constrained to the

range V

v (Vin or V

out

) v VDD.

Unused inputs must always be tied to an appropriate logic voltage level (e.g., either V

or VDD). Unused out-

puts must be left open.

SOEIAJ–16

F SUFFIX

CASE 966

MC14490

AWLYWW

MC14490

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PIN ASSIGNMENT

125

out

OSC

out

OSC

out

BLOCK DIAGRAM

Ain1

OSC

out

Ein5

φ1

φ2

OSCILLATOR

AND

TWO–PHASE

CLOCK GENERATOR

DATA

SHIFT LOAD

4–BIT STATIC SHIFT REGISTER

1/2–BIT

DELAY

φ1 φ2

15 A

out

VDD = PIN 16

= PIN 8

φ1 φ2

out

13 C

out

11 E

out

IDENTICAL TO ABOVE STAGE

MC14490

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ELECTRICAL CHARACTERISTICS (Voltages Referenced to V

)

– 55_C

25_C

125_C

Characteristic

Symbol

Vdc

Min

Max

Min

Typ

(4.)

Max

Min

Max

Unit

ОООООООО

Output Voltage “0” Level

Vin = VDD or 0

ÎÎ

5.0 10 15

— — —

0.05

ÎÎ

— — —

0 0 0

ÎÎ

0.05

— — —

0.05

Vdc

ОООООООО

“1” Level

Vin = 0 or V

ÎÎ

5.0 10 15

4.95

9.95

14.95

— — —

ÎÎ

4.95

9.95

14.95

5.0 10 15

ÎÎ

— — —

4.95

9.95

14.95

— — —

Vdc

ОООООООО

Input Voltage “0” Level

(VO = 4.5 or 0.5 Vdc) (V

= 9.0 or 1.0 Vdc)

(VO = 13.5 or 1.5 Vdc)

ÎÎ

5.0 10 15

— — —

1.5

3.0

4.0

ÎÎ

— — —

2.25

4.50

6.75

ÎÎ

1.5

3.0

4.0

— — —

1.5

3.0

4.0

Vdc

ОООООООО

(VO = 0.5 or 4.5 Vdc) “1 Level” (VO = 1.0 or 9.0 Vdc) (VO = 1.5 or 13.5 Vdc)

ÎÎ

5.0 10 15

3.5

7.0 11

— — —

ÎÎ

3.5

7.0 11

2.75

5.50

8.25

ÎÎ

— — —

3.5

7.0 11

— — —

Vdc

ОООООООО

Output Drive Current

Oscillator Output Source

(VOH = 2.5 V) (V

= 4.6 V) (VOH = 9.5 V) (VOH = 13.5 V)

ÎÎ

5.0

5.0 10 15

– 0.6 – 0.12 – 0.23

– 1.4

— — — —

ÎÎ

– 0.5 – 0.1 – 0.2 – 1.2

– 1.5 – 0.3 – 0.8 – 3.0

ÎÎ

— — — —

– 0.4 – 0.08 – 0.16

– 1.0

— — — —

mAdc

ОООООООО

Debounce Outputs

= 2.5 V)

= 4.6 V) (VOH = 9.5 V) (VOH = 13.5 V)

ÎÎ

5.0

5.0 10 15

– 0.9

– 0.19

– 0.6

1.8

— — — —

ÎÎ

– 0.75 – 0.16

– 0.5 – 1.5

– 2.2

– 0.46

– 1.2 – 4.5

ÎÎ

— — — —

– 0.6

– 0.12

– 0.4 – 1.2

— — — —

ОООООООО

Oscillator Output Sink

(VOL = 0.4 V) (VOL = 0.5 V) (V

= 1.5 V)

ÎÎ

5.0 10 15

0.36

0.9

4.2

— — —

ÎÎ

0.3

0.75

3.5

0.9

2.3 10

ÎÎ

— — —

0.24

0.6

2.8

— — —

mAdc

ОООООООО

Debounce Outputs

= 0.4 V) (VOL = 0.5 V) (VOL = 1.5 V)

ÎÎ

5.0 10 15

2.6

4.0 12

— — —

ÎÎ

2.2

3.3 10

4.0

9.0 35

ÎÎ

— — —

1.8

2.7

8.1

— — —

ОООООООО

Input Current

Debounce Inputs (V

= VDD)

ÎÎ

—

2.0

ÎÎ

—

0.2

ÎÎ

2.0

—

µAdc

Input Current Oscillator — Pin 7

(Vin = VSS or VDD)

—

± 620

—

± 255

± 400

—

± 250

µAdc

ОООООООО

Pullup Resistor Source Current

Debounce Inputs (Vin = VSS)

ÎÎ

5.0 10 15

175 340 505

375 740

1100

ÎÎ

140 280 415

190 380 570

ÎÎ

255 500 750

70 145 215

225 440 660

µAdc

Input Capacitance

—

5.0

7.5

—

ОООООООО

Quiescent Current

(Vin = VSS or VDD, I

out

= 0 µA)

ÎÎ

5.0 10 15

— — —

150 280 840

ÎÎ

— — —

40 90

225

ÎÎ

100 225 650

— — —

90 180 550

µAdc

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

MC14490

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SWITCHING CHARACTERISTICS

(5.)

= 50 pF, T

= 25_C)

Characteristic

ÎÎÎÎ

Symbol

Vdc

Min

Typ

(6.)

Max

Unit

ОООООООООООООО

Output Rise Time

All Outputs

ÎÎÎÎ

ÎÎÎ

TLH

ÎÎ

5.0 10 15

ÎÎ

— — —

ÎÎ

180

90 65

ÎÎ

360 180 130

ОООООООООООООО

Output Fall Time Oscillator Output

ÎÎÎÎ

ÎÎÎ

THL

ÎÎ

5.0 10 15

ÎÎ

— — —

ÎÎ

100

50 40

ÎÎ

200 100

ОООООООООООООО

Debounce Outputs

ÎÎÎÎ

ÎÎÎ

THL

ÎÎ

5.0 10 15

ÎÎ

— — —

ÎÎ

60 30 20

ÎÎ

120

60 40

ОООООООООООООО

Propagation Delay Time

Oscillator Input to Debounce Outputs

ÎÎÎÎ

ÎÎÎ

PHL

ÎÎ

5.0 10 15

ÎÎ

— — —

ÎÎ

285 120

ÎÎ

570 240 190

ОООООООООООООО

ÎÎÎÎ

ÎÎÎ

PLH

ÎÎ

5.0 10 15

ÎÎ

— — —

ÎÎ

370 160 120

ÎÎ

740 320 240

ОООООООООООООО

Clock Frequency (50% Duly Cycle)

(External Clock)

ÎÎÎÎ

ÎÎÎ

ÎÎ

5.0 10 15

ÎÎ

— — —

ÎÎ

2.8 6 9

ÎÎ

1.4

3.0

4.5

MHz

ОООООООООООООО

Setup Time (See Figure 1)

ÎÎÎÎ

ÎÎÎ

ÎÎ

5.0 10 15

ÎÎ

100

80 60

ÎÎ

50 40 30

ÎÎ

— — —

ОООООООООООООО

Maximum External Clock Input

Rise and Fall Time Oscillator Input

ÎÎÎÎ

ÎÎÎ

tr, t

ÎÎ

5.0 10 15

ОООООООО

No Limit

ОООООООООООООО

Oscillator Frequency

OSC

out

ext

≥ 100 pF*

Note: These equations are intended to be a design guide.

Laboratory experimentation may be required. Formulas are typically ± 15% of actual frequencies.

ÎÎÎÎ

ÎÎÎ

osc

, typ

ÎÎ

5.0

ОООООООО

1.5

ext

(inmF)

4.5

ext

(inmF)

6.5

ext

(inmF)

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

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

*POWER–DOWN CONSIDERATIONS

Large values of C

ext

may cause problems when powering down the MC14490 because of the amount of energy stored in the capacitor. When a system containing this device is powered down, the capacitor may discharge through the input protection diodes at Pin 7 or the parasitic diodes at Pin 9. Current through these internal diodes must be limited to 10 mA, therefore the turn–off time of the power supply must not be faster than t = (VDD – VSS)  C

ext

/(10 mA). For example, If VDD – VSS = 15

V and C

ext

= 1 µF , the power supply must turn off no faster than t = (15 V)  (1 µF)/10 mA = 1.5 ms. This is usually not a problem

because power supplies are heavily filtered and cannot discharge at this rate.

When a more rapid decrease of the power supply to zero volts occurs, the MC14490 may sustain damage. To avoid this

possibility, use external clamping diodes, D1 and D2, connected as shown in Figure 2.

Figure 1. Switching Waveforms Figure 2. Discharge Protection During Power Down

OSC

out

OSC

0 V

0 V V

0 V

50%

90%

50%

10%

PHL

90%

10%

50%

D1 D2C

ext

OSC

out

MC14490

PLH

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MOTOROLA MC14490P, MC14490DW, MC14490DWR2, MC14490FEL, MC14490FL1 Datasheet

Specifications and Main Features

Frequently Asked Questions

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