AT80SND1C-ROTIL datasheet(186/210 Pages) ATMEL

186 / 210 page

186

AT8xC51SND1C

4109E–8051–06/03

AC Characteristics

External 8-bit Bus Cycles

Definition of Symbols

Table 159. External 8-bit Bus Cycles Timing Symbol Definitions

Timings

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

Table 160. External 8-bit Bus Cycle - Data Read AC Timings

DD = 2.7 to 3.3 V, TA = -40 to +85°C

Signals

Conditions

Address

High

Data In

Low

LALE

Valid

Data Out

No Longer Valid

RRD

ZFloating

WWR

Symbol

Parameter

Variable Clock

Standard Mode

Variable Clock

X2 Mode

Unit

Min

Max

Min

Max

TCLCL

Clock Period

TLHLL

ALE Pulse Width

2·TCLCL-15

TCLCL-15

TAVLL

Address Valid to ALE Low

TCLCL-20

0.5·TCLCL-20

TLLAX

Address hold after ALE Low

TCLCL-20

0.5·TCLCL-20

TLLRL

ALE Low to RD Low

3·TCLCL-30

1.5·TCLCL-30

TRLRH

RD Pulse Width

6·TCLCL-25

3·TCLCL-25

TRHLH

RD high to ALE High

TCLCL-20

TCLCL+20

0.5·TCLCL-20 0.5·TCLCL+20

TAVDV

Address Valid to Valid Data In

9·TCLCL-65

4.5·TCLCL-65

TAVRL

Address Valid to RD Low

4·TCLCL-30

2·TCLCL-30

TRLDV

RD Low to Valid Data

5·TCLCL-30

2.5·TCLCL-30

TRLAZ

RD Low to Address Float

TRHDX

Data Hold After RD High

TRHDZ

Instruction Float After RD High

2·TCLCL-25

TCLCL-25

AT80SND1C-ROTIL 데이터시트(PDF) 186 Page - ATMEL Corporation

AT80SND1C-ROTIL 데이터시트(HTML) 186 Page - ATMEL Corporation

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