W83C43

- 6 -

ELECTRICAL CHARACTERISTICS & CAPACITANCE

(Ta = 0

SYMBOL

DESCRIPTION

MIN.

TYP.

MAX.

UNIT

NOTE

Power Supply

4.75

5.0

5.25

V

Input Low Voltage (except RESET, T0,

T1)

0.8

V

Input Low Voltage (RESET, T0, T1)

0.6

V

Input High Voltage (except RESET, T0,

T1, P10, P11)

2.0

V

Input High Voltage (P10, P11)

3.0

V

Input High Voltage (T0, T1, RESET)

3.5

V

Output High Voltage (P10

−P13,

P20

−P27)

2.4

V

mA

Output High Voltage (D0

−D7)

2.4

V

mA

Output Low Voltage (P10

−P13,

P20

−P27)

0.4

V

Output Low Voltage (D0

−D7)

0.4

V

Min. I/P Resist

10K

Ω

O/P Leakage Current (D0

−D7, High Z

State)

-10

10

µA

I/P Leakage Current

-10

10

µA

I/P Leakage Current (Except P10, P11,

P14, P15, P16, P17)

-10

10

µA

I/P Leakage Current (P10, P11, P14,

P15, P16, P17)

-10

550

µA

O/P Load Capacity

15

50

pF

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

DESCRIPTION

0

Output Buffer Full

0: Output buffer empty

1: Output buffer full

1

Input Buffer Full

0: Input buffer empty

1: Input buffer full