EM84510
PS/2 SCROLLING MOUSE CONTROLLER
AC ELECTRICAL CHARACTERISTICS (TA=0°C to 70°C)
Parameters
Sym.
Min.
Typ.
Max.
Unit
Oscillating Frequency (OSCR=51KΩ)
Key Debounce
Fosc
37.5-10% 37.5 37.5+10%
KHz
Tkd
Tr
-
12
-
-
-
-
-
-
-
ms
us
us
us
us
us
Rising Edge Crossed Width Fosc=35 KHz
Falling Edge Crossed Width Fosc=35 KHz
Mouse CLK Active Time
14.6
Tf
14.6
-
Tmca
Tmci
Tmdc
-
-
-
40
40
13.3
Mouse CLK Inactive Time
Mouse Sample DATA from
CLK rising Edge
System CLK Active Time
Tsca
Tsci
Tsdc
Tscd
Tpi
-
-
40
40
-
-
us
us
us
us
us
System CLK Inactive Time
Time from DATA Transition to Falling Edge of CLK
-
13.3
26.7
-
-
Time from rising Edge of CLK to DATA Transition
Time to mouse Inhibit after the 11th CLK to
ensure mouse does not start another Transmission
-
0
-
50
PS. The AC timings are measured under using 35 KHz system clock signal.
TIMING DIAGRAM
(1) Photo-couples pulse width :
X1 (Y1)
X2 (Y2)
Tf
Tr
(2) PS/2 Mouse
(A) Receiving DATA
1st
CLK
2nd
CLK
9th
CLK
10th
CLK
11th
CLK
Inhibit
CLK
• • • • •
>
<
>
<
Tmca
Tmci
> <
Tmdc
DATA
• • • • • • • • •
• • •
• • • • •
• •
Stop
Bit
Start
Bit
Line
Control
Bit
Parity
Bit0 -Bit7
Bit
5.30.2001
* This specification are subject to be changed without notice.
12
ELAN [ ELAN MICROELECTRONICS CORP ]
