T83C51SND1-ROTIL datasheet(39/60 Pages) ATMEL

39 / 60 page

T8xC51SND1

Rev. D – 15-Nov-01

12. AC Characteristics

12.1 AC Characteristics - External 8-bit Bus Cycles

12.2.1 Definition of symbols

Table 44. External 8-bit Bus Cycles Timing Symbol Definitions

12.3.2 Timings

Test conditions: capacitive load on all pins= 50 pF.

Table 45. External 8-bit Bus Cycle - Data Read AC Timings

VDD= 2.7 to 3.3 V, TA= -40 to +85

°C

Signals

Conditions

Address

High

Data In

Low

ALE

Valid

Data Out

No Longer Valid

RD#

Floating

WWR#

Symbol

Parameter

Variable Clock

Standard Mode

Variable Clock

X2 Mode

Unit

Min

Max

Min

Max

CLCL

Clock Period

LHLL

ALE Pulse Width

2·T

CLCL-15

AVLL

Address Valid to ALE Low

CLCL-20

0.5·T

CLCL-20

LLAX

Address hold after ALE Low

CLCL-20

0.5·T

CLCL-20

LLRL

ALE Low to RD# Low

3·T

CLCL-30

1.5·T

CLCL-30

RLRH

RD# Pulse Width

6·T

CLCL-25

3·T

CLCL-25

RHLH

RD# high to ALE High

CLCL-20

CLCL+20

0.5·T

CLCL-20

0.5·T

CLCL+20

AVDV

Address Valid to Valid Data In

9·T

CLCL-65

4.5·T

CLCL-65

AVRL

Address Valid to RD# Low

4·T

CLCL-30

2·T

CLCL-30

RLDV

RD# Low to Valid Data

5·T

CLCL-30

2.5·T

CLCL-30

RLAZ

RD# Low to Address Float

RHDX

Data Hold After RD# High

TRHDZ

Instruction Float After RD#

High

2·TCLCL-25

TCLCL-25

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