GMS90C51 datasheet(44/59 Pages) HYNIX

44 / 59 page

GMS90 Series

Dec. 1998 Ver 3.0

AC Characteristics for GMS90 series (40MHz version)

VCC= 5V + 10%, − 15%; VSS= 0V; TA= 0°C to 70°C

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

External Program Memory Characteristics

† Interfacing the GMS90 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−15

Address setup to ALE

tAVLL

tCLCL−15

Address hold after ALE

tLLAX

tCLCL−15

ALE low to valid instruction in

tLLIV

-55

4tCLCL−45

ALE to PSEN

tLLPL

tCLCL−15

PSEN pulse width

tPLPH

3tCLCL−15

PSEN to valid instruction in

tPLIV

-25

3tCLCL−50

Input instruction hold after PSEN

tPXIX

Input instruction float after PSEN

tPXIZ †

-15

tCLCL−10

Address valid after PSEN

tPXAV †

tCLCL−5-

Address to valid instruction in

tAVIV

-65

5tCLCL−60

Address float to PSEN

tAZPL

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