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GMS90X5XC Series HYUNDAI MicroElectronics
Jan. 2001 Ver 1.0 37
AC Characteristics for GMS90X5XC series (40MHz 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 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/t
CLCL
= 3.5 to 40MHz
Unit
Min. Max. Min. Max.
ALE pulse width t
LHLL
35 - 2t
CLCL
−
15 - ns
Address setup to ALE t
AVLL
10 - t
CLCL
−
15 - ns
Address hold after ALE t
LLAX
10 - t
CLCL
−
15 - ns
ALE low to valid instruction in t
LLIV
-55 -4t
CLCL
−
45 ns
ALE to PSEN
t
LLPL
10 - t
CLCL
−
15 - ns
PSEN
pulse width t
PLPH
60 - 3t
CLCL
−
15 - ns
PSEN
to valid instruction in t
PLIV
-25 -3t
CLCL
−
50 ns
Input instruction hold after PSEN
t
PXIX
0- 0 - ns
Input instruction float after PSEN
t
PXIZ
†
-15 -t
CLCL
−
10 ns
Address valid after PSEN
t
PXAV
†
20 - t
CLCL
−
5- ns
Address to valid instruction in t
AVIV
-65 -5t
CLCL
−
60 ns
Address float to PSEN
t
AZPL
5- 5 - ns