DS80C320 datasheet(29/42 Pages) DALLAS

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DS80C320/DS80C323

29 of 42

DS80C323 AC ELECTRICAL CHARACTERISTICS

PARAMETER

SYMBOL

18 MHz

MIN

18 MHz

MAX

VARIABLE

CLOCK

MIN

VARIABLE

CLOCK

MAX

UNITS

Oscillator Frequency

(Ext. Osc.)

(Ext. Crystal)

1/tCLCL

MHz

ALE Pulse Width

tLHLL

1.5tCLCL-10

Port 0 Address Valid

to ALE Low

tAVLL

0.5tCLCL-11

Address Hold After

ALE Low

tLLAX1

note 5

0.25tCLCL-5

note 5

Address Hold After

ALE Low for MOVX WR

tLLAX2

0.5tCLCL-7

ALE Low to Valid

Instruction In

tLLIV

112

2.5tCLCL-27

ALE Low to PSEN Low

tLLPL

0.25tCLCL-7

PSEN

Pulse Width

tPLPH

118

2.25tCLCL-7

PSEN

Low to Valid

Instruction In

tPLIV

104

2.25tCLCL-21

Input Instruction Hold

After PSEN

tPXIX

Input Instruction Float

After PSEN

tPXIZ

tCLCL-5

Port 0 Address to Valid

Instruction In

tAVIV1

140

3tCLCL-27

Port 2 Address to Valid

Instruction In

tAVIV2

162

3.5tCLCL-33

PSEN

Low to

Address Float

tPLAZ

note 5

NOTES FOR DS80C323 AC ELECTRICAL CHARACTERISTICS:

All parameters apply to both commercial and industrial temperature range operation unless otherwise

noted. AC timing characteristics valid for oscillator frequency > 16 MHz.

1. All signals rated over operating temperature at 18 MHz.

2. All signals characterized with load capacitance of 80 pF except Port 0, ALE, PSEN , RD and WR at

100 pF. Note that loading should be approximately equal for valid timing.

3. Interfacing to memory devices with float times (turn off times) over 35 ns may cause contention. This

will not damage the parts, but will cause an increase in operating current.

4. Specifications assume a 50% duty cycle for the oscillator. Port 2 timing will change with the duty

cycle variations.

5. Address is held in a weak latch until over-driven by external memory.

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