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HYUNDAI MicroElectronics GMS90X5XC Series
28 Jan. 2001 Ver 1.0
AC Characteristics
Explanation of the AC Symbols
Each timing symbol has 5 characters. The first character is always a ‘t’ (stand for time). The other characters,
depending on their positions, stand for the name of a signal or the logical status of that signal. The following is
a list of all the characters and what they stand for.
AC Characteristics for GMS90X5XC series (12MHz version)
External Program Memory Characteristics
V
CC
= 5V :
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)
V
CC
= 3.3V :
V
CC
= 3.3V
+
0.3V,
−
0.6V; V
SS
= 0V; T
A
= 0
°
C to 70
°
C
(C
L
for port 0. ALE and PSEN outputs = 50pF; C
L
for all other outputs = 50pF)
Variable clock :
Vcc = 5V : 1/t
CLCL
= 3.5 MHz to 12 MHz
Vcc = 3.3V : 1/t
CLCL
= 1 MHz to 12 MHz
Parameter Symbol
12 MHz Oscillator
Variable Oscillator
1/t
CLCL
= 3.5 to 12MHz
Unit
Min. Max. Min. Max.
ALE pulse width t
LHLL
127 - 2t
CLCL
-40 - ns
Address setup to ALE t
AVLL
43 - t
CLCL
-40 - ns
Address hold after ALE t
LLAX
30 - t
CLCL
-53 - ns
ALE low to valid instruction in t
LLIV
-233 -4t
CLCL
-100 ns
ALE to PSEN t
LLPL
58 - t
CLCL
-25 - ns
PSEN
pulse width t
PLPH
215 - 3t
CLCL
-35 - ns
PSEN
to valid instruction in t
PLIV
-150 -3t
CLCL
-100 ns
Input instruction hold after PSEN t
PXIX
0- 0 - ns
Input instruction float after PSEN
t
PXIZ
†
-63 -t
CLCL
-20 ns
Address valid after PSEN
t
PXAV
†
75 - t
CLCL
-8 - ns
Address to valid instruction in t
AVIV
-302 -5t
CLCL
-115 ns
Address float to PSEN
t
AZPL
0- 0 - ns
A: Address
C: Clock
D: Input Data
H: Logic level HIGH
I: Instruction (program memory contents)
L: Logic level LOW, or ALE
P: PSEN
Q: Output Data
R: RD
signal
T: Time
V: Valid
W: WR
signal
X: No longer a valid logic level
Z: Float
For example,
t
AVLL
= Time from Address Valid to ALE Low
t
LLPL
= Time from ALE Low to PSEN Low