HMS99C52 datasheet(35/43 Pages) HYNIX

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HMS99C5X Series

Jan. 2003 Ver 1.0

AC Characteristics for HMS99C5X series (40MHz version)

VCC= 5V + 10%, − 15%; VSS= 0V; TA= -40°C to 85°C

(CL for port 0. ALE and PSEN outputs = 100pF; CL for all other outputs = 80pF)

External Program Memory Characteristics

† Interfacing the HMS99C5X series to devices with float times up to 20 ns is permissible. This limited bus contention will not

cause any damage to port 0 Drivers.

Parameter

Symbol

40 MHz Oscillator

Variable Oscillator

1/tCLCL = 3.5 to 40MHz

Unit

Min.

Max.

Min.

Max.

ALE pulse width

tLHLL

2tCLCL−20

Address setup to ALE

tAVLL

tCLCL−20

Address hold after ALE

tLLAX

tCLCL−20

-ns

ALE low to valid instruction in

tLLIV

-56

4tCLCL−65

ALE to PSEN

tLLPL

tCLCL−15

PSEN pulse width

tPLPH

3tCLCL−20

PSEN to valid instruction in

tPLIV

-35

3tCLCL−55

Input instruction hold after PSEN

tPXIX

Input instruction float after PSEN

tPXIZ †

-20

tCLCL−10

Address valid after PSEN

tPXAV †

tCLCL−5-

Address to valid instruction in

tAVIV

-91

5tCLCL−60

Address float to PSEN

tAZPL

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