Philips Semiconductors

Product specification

TPM749

Microcontroller with TrackPoint

™ microcode from IBM

1996 May 01

9

AC ELECTRICAL CHARACTERISTICS

12MHz CLOCK

VARIABLE CLOCK

SYMBOL

PARAMETER

MIN

MAX

MIN

MAX

UNIT

Oscillator frequency:

3.5

12

MHz

External Clock (Figure 3)

High time

20

20

ns

Low time

20

20

ns

Rise time

20

20

ns

Fall time

20

20

ns

EXPLANATION OF THE AC SYMBOLS

Each timing symbol has five characters. The first character is always

‘t’ (= time). The other characters, depending on their positions,

indicate the name of a signal or the logical status of that signal. The

designations are:

C – Clock

D – Input data

H – Logic level high

L – Logic level low

Q – Output data

T – Time

V – Valid

X – No longer a valid logic level

Z – Float

0.45V

SU00297

Figure 3. External Clock Drive

0.45V

SU00307

Figure 4. AC Testing Input/Output