EM78P257
OTP ROM
DATA to low, and clock once more. If framing error occurs, EM78P257A/B continues to clock until
DATA is high, then clocks the line control bit and requests for a Resend. When the system sends
out a command or data transmission that requires a response, the system waits for EM78P257A/B
to respond before sending its next output.
X1,X2,Y1,Y2,Z1,Z2 INPUT IM PEDANCE
18
16
14
12
10
8
M AX
TYP
M IN
6
4
2
0
VOLTS(LIN)
Table 26 MOUSE AC electrical characteristics (TA = 0℃to 70℃)
Parameters
Sym.
Tkd
Min.
-
Typ.
12
Max.
-
Unit
ms
Key Debounce
Rising Edge Crossed Width Fosc=35 KHz
Falling Edge Crossed Width Fosc=35 KHz
Mouse CLK Active Time
Mouse CLK Inactive Time
Mouse Sample DATA from CLK rising Edge
System CLK Active Time
Tr
Tf
14.3
14.3
-
-
-
-
-
-
-
-
-
-
-
us
us
us
us
us
us
us
us
us
Tmca
Tmci
Tmdc
Tsca
Tsci
Tsdc
Tscd
-
-
-
-
-
-
-
42.9
42.9
14.3
42.9
42.9
14.3
28.6
System CLK Inactive Time
Time from DATA Transition to Falling Edge of CLK
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
Tpi
0
-
50
us
In Oscillating Frequency = 34.3 KHz.
This specification is subject to change without prior notice.
58
07.27.2004 (V1.4)
ELAN [ ELAN MICROELECTRONICS CORP ]
