8XC525458

EXPLANATION OF THE AC SYMBOLS

Each timing symbol has 5 characters The first char-

acter is always a ‘T’ (stands for time) The other

characters depending on their positions stand for

the name of a signal or the logical status of that

signal The following is a list of all the characters and

what they stand for

A Address

C Clock

D Input Data

H Logic level HIGH

I Instruction (program memory contents)

L Logic level LOW or ALE

P PSEN

Q Output Data

R RD signal

T Time

V Valid

W WR signal

X No longer a valid logic level

Z Float

For example

TAVLL e Time from Address Valid to ALE Low

TLLPL e Time from ALE Low to PSEN Low

PSEN e 100 pF Load Capacitance for All Other Outputs e 80 pF)

EXTERNAL MEMORY CHARACTERISTICS

All parameter values apply to all devices unless otherwise indicated In this table 8XC5X refers to 8XC5X

8XC5X-1 and 8XC5X-2

Symbol

Parameter

Oscillator

Units

12 MHz

24 MHz

33 MHz

Variable

Min Max Min Max Min Max

Min

Max

1TCLCL Oscillator Frequency

8XC5X

35

12

MHz

8XC5X-1

35

16

MHz

8XC5X-2

05

12

MHz

8XC5X-24

35

24

MHz

8XC5X-33

35

33

MHz

TLHLL

ALE Pulse Width

127

43

21

2 TCLCL b 40

ns

TAVLL

Address Valid to

ALE Low

8XC5X

43

TCLCL b 40

ns

8XC5X-24

12

TCLCL b 30

ns

8XC5X-33

5

TCLCL b 25

ns

TLLAX

Address Hold After

ALE Low

8XC5X-24

53

12

TCLCL b 30

ns

8XC5X-33

5

TCLCL b 25

ns

TLLIV

ALE Low to Valid

Instruction In

8XC5X

234

4 TCLCL b 100

ns

8XC5X-24

91

4 TCLCL b 75

ns

8XC5X-33

56

4 TCLCL b 65

ns

12