W78L51

- 10 -

DC Characteristics, continued

PARAMETER

SYM.

SPECIFICATION

UNIT

TEST CONDITIONS

MIN.

MAX.

Input Low Voltage

0

0.8

V

XTAL1 [*3]

0

0.6

V

Input High Voltage

2.0

V

1.4

V

Input High Voltage

3.5

V

RST[*1]

1.7

V

Input High Voltage

3.5

V

XTAL1 [*3]

1.6

V

Output Low Voltage

-

0.45

V

P1, P2, P3, P4

-

0.25

V

Output Low Voltage

-

0.45

V

P0, ALE, PSEN [*2]

-

0.25

V

Sink Current

4

9

mA

P1, P2, P3, P4

1.8

5.4

mA

Sink Current

8

16

mA

P0, ALE, PSEN

4.5

9

mA

Output High Voltage

2.4

-

V

µA

P1, P2, P3, P4

1.4

-

V

µA

Output High Voltage

2.4

-

V

µA

P0, ALE, PSEN [*2]

1.4

-

V

µA

Source Current

-100

-250

µA

P1, P2, P3, P4

-10

-30

µA

Source Current

-8

-16

mA

P0, ALE, PSEN

-1.0

-2.4

mA

Notes:

*1. RST pin is a Schmitt trigger input.

*2. P0, ALE and /PSEN are tested in the external access mode.

*3. XTAL1 is a CMOS input.

*4. Pins of P1, P2, P3, P4 can source a transition current when they are being externally driven from 1 to 0.