Preliminary W78LE51

Publication Release Date: December 1998

- 13 -

Revision A1

DC Characteristics, continued

PARAMETER

SYM.

SPECIFICATION

UNIT

TEST CONDITIONS

MIN.

MAX.

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

-20

-50

µA

Source Current

-8

-14

mA

P0, ALE, PSEN

-1.9

-3.8

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.

AC CHARACTERISTICS

The AC specifications are a function of the particular process used to manufacture the part, the

ratings of the I/O buffers, the capacitive load, and the internal routing capacitance. Most of the

usually experience less than a

±20 nS variation. The numbers below represent the performance

expected from a 0.6micron CMOS process when using 2 and 4 mA output buffers.

Clock Input Waveform

T

T

XTAL1

F

CH

CL

OP,

PARAMETER

SYMBOL

MIN.

TYP.

MAX.

UNIT

NOTES

Operating Speed

0

-

24

MHz

1

Clock Period

25

-

-

nS

2

Clock High

10

-

-

nS

3

Clock Low

10

-

-

nS

3

Notes:

1. The clock may be stopped indefinitely in either state.

3. There are no duty cycle requirements on the XTAL1 input.