W83C43 Datasheet, PDF (6/21 Pages) Winbond – KEYBOARD CONTROLLER

W83C43
ELECTRICAL CHARACTERISTICS & CAPACITANCE
(Ta = 0° C to + 70° C, VDD = +5V ± 5%)
SYMBOL
DESCRIPTION
MIN. TYP.
VDD Power Supply
4.75 5.0
VIL
Input Low Voltage (except RESET, T0,
T1)
VIL1 Input Low Voltage (RESET, T0, T1)
VIH1 Input High Voltage (except RESET, T0, 2.0
T1, P10, P11)
VIH2 Input High Voltage (P10, P11)
3.0
VIH3 Input High Voltage (T0, T1, RESET)
3.5
VOH1
Output High Voltage (P10−P13,
P20−P27)
VOH2 Output High Voltage (D0−D7)
VOL1 Output Low Voltage (P10−P13,
0.4
P20−P27)
VOL2 Output Low Voltage (D0−D7)
0.4
RIP
Min. I/P Resist
10K
IOFL O/P Leakage Current (D0−D7, High Z
-10
State)
IIH
I/P Leakage Current
-10
IIL
I/P Leakage Current (Except P10, P11, -10
P14, P15, P16, P17)
IIL1
I/P Leakage Current (P10, P11, P14,
-10
P15, P16, P17)
CL
O/P Load Capacity
15
MAX.
5.25
0.8
0.6
2.4
2.4
10
10
10
550
50
UNIT
V
V
V
V
V
V
V
V
V
V
Ω
µA
µA
µA
µA
pF
NOTE
IOH = -2
mA
IOH = -4
mA
IOL = 2 mA
IOL = 4 mA
VDD = 5.5V,
VIN = VDD
VDD = 5.5V,
VIN = VSS
VDD = 5.5V,
VIN = VSS
STATUS REGISTER (AT MODE)
The status register is an 8-bit read-only register at I/O address hex 64 that holds information about the
status of the keyboard controller and interface. It may be read at any time.
BIT
BIT FUNCTION
0
Output Buffer Full
1
Input Buffer Full
DESCRIPTION
0: Output buffer empty
1: Output buffer full
0: Input buffer empty
1: Input buffer full
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