DS80C320/DS80C323 High-Speed/Low-Power Microcontrollers

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AC ELECTRICAL CHARACTERISTICS—DS80C323

18 MHz

VARIABLE CLOCK

PARAMETER

SYMBOL

MIN

MAX

MIN

MAX

UNITS

External

Oscillator

0

18

0

18

Oscillator

Frequency

External

Crystal

1

18

1

18

MHz

ALE Pulse Width

68

ns

Port 0 Address Valid

to ALE Low

16

ns

Address Hold After

ALE Low

6

(Note 5)

(Note 5)

ns

Address Hold After

14

ns

ALE Low to Valid

Instruction In

93

ns

4

ns

PSEN

Pulse Width

118

ns

PSEN

Low to Valid

Instruction In

87

ns

Input Instruction Hold

0

0

ns

Input Instruction Float

51

ns

Port 0 Address to Valid

Instruction In

128

ns

Port 2 Address to Valid

Instruction In

139

ns

PSEN

Low to Address Float

(Note 5)

(Note 5)

ns

NOTES FOR DS80C323 AC ELECTRICAL CHARACTERISTICS

All parameters apply to both commercial and industrial temperature operation unless otherwise noted. Specifications to -40°C

are guaranteed by design and are not production tested. AC electrical characteristics assume 50% duty cycle for the oscillator,

oscillator frequency > 16MHz, and are not 100% production tested, but are guaranteed by design.

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

Note that loading should be approximately equal for valid timing.

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