HMS99C52 datasheet(33/43 Pages) HYNIX

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HMS99C5X Series

Jan. 2003 Ver 1.0

AC Characteristics for HMS99C5X series (24MHz 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 35 ns is permissible. This limited bus contention will not

cause any damage to port 0 Drivers.

Parameter

Symbol

24 MHz Oscillator

Variable Oscillator

1/tCLCL = 3.5 to 24MHz

Unit

Min.

Max.

Min.

Max.

ALE pulse width

tLHLL

2tCLCL-40

Address setup to ALE

tAVLL

tCLCL-25

Address hold after ALE

tLLAX

tCLCL-25

ALE low to valid instruction in

tLLIV

-80

4tCLCL-87

ALE to PSEN

tLLPL

tCLCL-20

PSEN pulse width

tPLPH

3tCLCL-30

PSEN to valid instruction in

tPLIV

-60

3tCLCL-65

Input instruction hold after PSEN

tPXIX

Input instruction float after PSEN

tPXIZ †

-32

tCLCL-10

Address valid after PSEN

tPXAV †

tCLCL-5

Address to valid instruction in

tAVIV

-148

5tCLCL-60

Address float to PSEN

tAZPL

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