DS80C320 datasheet(31/42 Pages) DALLAS

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DS80C320/DS80C323

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DS80C320/DS80C323 EXTERNAL CLOCK CHARACTERISTICS

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

NOTES

Clock High Time

tCHCX

Clock Low Time

tCLCX

Clock Rise Time

tCLCH

Clock Fall Time

tCHCL

DS80C320/DS80C323 SERIAL PORT MODE 0 TIMING CHARACTERISTICS

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

NOTES

Serial Port Clock Cycle Time

SM2=0 12 clocks per cycle

SM2=1 4 clocks per cycle

tXLXL

12tCLCL

4tCLCL

Output Data Setup to Clock

Rising Edge

SM2=0 12 clocks per cycle

SM2=1 4 clocks per cycle

tQVXH

10tCLCL

3tCLCL

Output Data Hold from Clock

Rising

SM2=0 12 clocks per cycle

SM2=1 4 clocks per cycle

tXHQX

2tCLCL

tCLCL

Input Data Hold after Clock

Rising

SM2=0 12 clocks per cycle

SM2=1 4 clocks per cycle

tXHDX

tCLCL

Clock Rising Edge to Input

Data Valid

SM2=0 12 clocks per cycle

SM2=1 4 clocks per cycle

tXHDV

11tCLCL

2tCLCL

EXPLANATION OF AC SYMBOLS

In an effort to remain compatible with the original 8051 family, this device specifies the same parameter

as such devices, using the same symbols. For completeness, the following is an explanation of the

symbols.

Time

Address

Clock

Input data

Logic level high

Logic level low

Instruction

PSEN

Output data

signal

Valid

signal

No longer a valid logic level

Tristate

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