EM83055H Datasheet, PDF (17/22 Pages) ELAN Microelectronics Corp – KEYBOARD ENCODER

EM83055H
KEYBOARD ENCODER
ABSOLUTE MAXIMUM RATINGS
Parameter
Supply Voltage
Input Voltage
Output Voltage
Temperature under bias
Storage temperature
Sym.
V_CC
V_IN
V_OUT
T_B
T_S
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
I_CCI
3 mA
Input leakage
I_IN
±1 µA
Input high voltage
V_IH
2.0
V
Input low voltage
V
0.8 V
IL
Output low voltage
V_OL1
0.4 V
Output low voltage for LEDS
V_OL2
3.2 V
Internal Pull-high resistance ( port 6,9 ) R_PH1 12
23 KΩ
Internal Pull-high resistance for
DATA, CLK
R_PH2 1.5 2.2
3
KΩ
Output low voltage for DATA CLK
V_OL3
0.4 V
Condition
Fosc=1.8432MHz
V_IN=V_CC ,V_SS
I_OL1 = 3.0 mA
I_OL2 = 10 mA
V_PH1 = 0V
V_PH2 = 0V
I_OL3 = 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