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EM83055H

KEYBOARD ENCODER

ELAN Microelectronics 

EM83055H

KEYBOARD ENCODER

ABSOLUTE MAXIMUM RATINGS

Parameter

Supply Voltage

Input Voltage

Output Voltage

Temperature under bias

Storage temperature

Sym.

VCC

VIN

VOUT

TB

TS

Ratings

-0.5V to +7V

-0.3V to +6V

-0.3V to +6V

0°C to 70°C

-65°C to 150°C

DC ELECTRICAL CHARACTERISTICS

Parameter

Sym. Min. Typ. Max. Unit

Operating voltage

V

4.5 5 5.5 V

CC

Operating supply current

ICCI

3 mA

Input leakage

IIN

±1 µA

Input high voltage

VIH

2.0

V

Input low voltage

V

0.8 V

IL

Output low voltage

VOL1

0.4 V

Output low voltage for LEDS

VOL2

3.2 V

Internal Pull-high resistance ( port 6,9 ) RPH1 12

23 KΩ

Internal Pull-high resistance for

DATA, CLK

RPH2 1.5 2.2

3

KΩ

Output low voltage for DATA CLK

VOL3

0.4 V

Condition

Fosc=1.8432MHz

VIN=VCC ,VSS

IOL1 = 3.0 mA

IOL2 = 10 mA

VPH1 = 0V

VPH2 = 0V

IOL3 = 5 mA

AC ELECTRICAL CHARACTERISTICS

Parameter

Time from DATA transition to falling edge of CLK

Time from rising edge of CLK to DATA transition

Duration of CLK inactive

Duration of CLK active

Time to auxiliary device inhibit after clock 11 to ensure

the auxiliary device does not start another transmission

Time from inactive to active CLK transition, used to time

when auxiliary device samples DATA

System clock

Sym. Min. Typ. Max.

T1

5

25

T2

5

T4 - 5

T3

30 40 50

T4

30 40 50

T5

50

T6

5

25

FCLK

1.843

Unit

µS

µS

µS

µS

µS

µS

MHz

* This specification are subject to be changed without notice.

9.25.2001 17

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