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GMS90X5XC Series HYUNDAI MicroElectronics
Jan. 2001 Ver 1.0 33
AC Characteristics for GMS90X5XC series (24MHz version)
V
CC
= 5V + 10%, −15%; V
SS
= 0V; T
A
= 0°C to 70°C
(C
L
for port 0. ALE and PSEN outputs = 100pF; C
L
for all other outputs = 80pF)
External Program Memory Characteristics
†
Interfacing the GMS90X5XC 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/t
CLCL
= 3.5 to 24MHz
Unit
Min. Max. Min. Max.
ALE pulse width t
LHLL
43 - 2t
CLCL
-40 - ns
Address setup to ALE t
AVLL
17 - t
CLCL
-25 - ns
Address hold after ALE t
LLAX
17 - t
CLCL
-25 - ns
ALE low to valid instruction in t
LLIV
-80 -4t
CLCL
-87 ns
ALE to PSEN t
LLPL
22 - t
CLCL
-20 - ns
PSEN
pulse width t
PLPH
95 - 3t
CLCL
-30 - ns
PSEN
to valid instruction in t
PLIV
-60 -3t
CLCL
-65 ns
Input instruction hold after PSEN t
PXIX
0- 0 - ns
Input instruction float after PSEN
t
PXIZ
†
-32 -t
CLCL
-10 ns
Address valid after PSEN
t
PXAV
†
37 - t
CLCL
-5 - ns
Address to valid instruction in t
AVIV
-148 -5t
CLCL
-60 ns
Address float to PSEN
t
AZPL
0- 0 - ns