Legacy-Free Keyboard/Embedded Controller with SPI and LPC Docking Interface
Table 28.2 DC Electrical Characteristics (T = 0°C - 70°C, V 1 and V 2= 3.3 VDC ±10%)
A
CC
CC
PARAMETER
SYMBOL
MIN
TYP
30
MAX
UNITS
COMMENTS
IPD Type Buffer
Low Input Level
High Input Level
Pull Down
0.8
V
V
IL
V
V
IH
2.0
uA
PD
ISP Type Input Buffer
with 90 µA weak pull-up
0.8
V
Schmitt Trigger
Schmitt Trigger
Low Input Level
High Input Level
V
V
V
ILIS
IHIS
HYS
2.2
V
250
mV
Schmitt Trigger
Hysteresis
ICLK Input Buffer
Low Input Level
High Input Level
VILCK
VIHCK
0.8
V
V
2.0
ICLK2/OCLK2 Crystal
Oscillator
Use a 32 Khz parallel resonant crystal oscillator. The load capacitors are seen by
the crystal as two capacitors in series and should be approximately CL = X/Y, X =
CL1* CL2, Y = CL1 + CL2. For example, a 7.5pF crystal should use two 15pF
capacitors for proper loading.
OD4 Type Buffer
Low Output Level
O8 Type Buffer
Low Output Level
High Output Level
OD8 Type Buffer
Low Output Level
O12 Type Buffer
Low Output Level
High Output Level
OD12 Type Buffer
Low Output Level
Output Leakage
V
0.4
0.4
V
V
= 4 mA
OL
OL
V
V
V
V
I
I
= 8 mA
OL
OL
2.4
= -4 mA
OH
OH
V
0.4
0.4
V
V
= 8 mA
OL
OL
V
V
V
V
I
I
= 12mA
= -6mA
OL
OL
2.4
-10
2.4
2.4
OH
OH
V
0.4
V
I
= 12mA
OL
OL
I
+10
µA
V
= 0 to 5V
OL
IN
O24 Type Buffer
Low Output Level
High Output Level
IO4 Type Buffer
Low Output Level
High Output Level
V
V
0.4
0.4
V
V
I
I
= 24 mA
= -12 mA
OL
OL
OH
OH
V
V
V
V
I
I
= 4mA
= -2mA
OL
OL
OH
OH
Revision 1.1 (01-14-03)
290
SMSC LPC47N350
DATASHEET
SMSC [ SMSC CORPORATION ]
