GMS90 Hynix Semiconductor, GMS90 Datasheet - Page 35

• Manufacturer Part Number: GMS90
• Description: 8-BIT SINGLE-CHIP MICROCONTROLLERS
• Manufacturer: Hynix Semiconductor

GMS90 Series
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 GMS90 series (12MHz version)
External Program Memory Characteristics
Dec. 1998 Ver 3.0
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
V
V
Variable clock :
ALE pulse width
Address setup to ALE
Address hold after ALE
ALE low to valid instruction in
ALE to PSEN
PSEN pulse width
PSEN to valid instruction in
Input instruction hold after PSEN
Input instruction float after PSEN
Address valid after PSEN
CC
CC
= 5V :
= 3.3V :
Parameter
V
(C
V
Vcc = 5V : 1/t
Vcc = 3.3V : 1/t
(C
CC
CC
L
L
for port 0. ALE and PSEN outputs = 100pF; C
= 5V
= 3.3V
for port 0. ALE and PSEN outputs = 50pF; C
10%,
0.3V,
CLCL
CLCL
t
t
t
t
t
t
t
t
t
t
LHLL
AVLL
LLAX
LLIV
LLPL
PLPH
PLIV
PXIX
PXIZ
PXAV
Symbol
= 3.5 MHz to 12 MHz
15%; V
= 1 MHz to 12 MHz
†
0.6V; V
†
SS
SS
= 0V; T
12 MHz Oscillator
= 0V; T
Min.
127
215
43
30
58
75
0
-
-
-
T: Time
V: Valid
W: WR signal
X: No longer a valid logic level
Z: Float
For example,
t
t
AVLL
LLPL
A
= 0 C to 70 C
A
= 0 C to 70 C
= Time from ALE Low to PSEN Low
= Time from Address Valid to ALE Low
Max.
233
150
63
-
-
-
-
-
-
-
L
L
for all other outputs = 50pF)
for all other outputs = 80pF)
2t
3t
1/t
t
t
t
CLCL
CLCL
CLCL
t
CLCL
CLCL
CLCL
Variable Oscillator
Min.
CLCL
0
-
-
-
-40
-53
-25
-40
-35
-8
= 3.5 to 12MHz
4t
3t
t
CLCL
CLCL
CLCL
Max.
-
-
-
-
-
-
-
-100
-100
-20
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
31