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
VCC= 5V : 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)
VCC= 3.3V : VCC= 3.3V + 0.3V, − 0.6V; VSS= 0V; TA= 0°C to 70°C
(CL for port 0. ALE and PSEN outputs = 50pF; CL for all other outputs = 50pF)
Variable clock : Vcc = 5V : 1/tCLCL = 3.5 MHz to 12 MHz
Vcc = 3.3V : 1/tCLCL = 1 MHz to 12 MHz
Parameter Symbol 12 MHz Oscillator Variable Oscillator
1/tCLCL = 3.5 to 12MHz Unit
Min. Max. Min. Max.
ALE pulse width tLHLL 127 - 2tCLCL-40 - ns
Address setup to ALE tAVLL 43 - tCLCL-40 - ns
Address hold after ALE tLLAX 30 - tCLCL-53 - ns
ALE low to valid instruction in tLLIV -233 -4t
CLCL-100 ns
ALE to PSEN tLLPL 58 - tCLCL-25 - ns
PSEN pulse width tPLPH 215 - 3tCLCL-35 - ns
PSEN to valid instruction in tPLIV -150 -3t
CLCL-100 ns
Input instruction hold after PSEN tPXIX 0- 0 - ns
Input instruction float after PSEN tPXIZ †-63 - t
CLCL-20 ns
Address valid after PSEN tPXAV †75 - tCLCL-8 - ns
Address to valid instruction in tAVIV -302 -5t
CLCL-115 ns
Address float to PSEN tAZPL 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,
tAVLL = Time from Address Valid to ALE Low
tLLPL = Time from ALE Low to PSEN Low