GMS90X5XC Series HYUNDAI MicroElectronics
Jan. 2001 Ver 1.0 37

AC Characteristics for GMS90X5XC series (40MHz version)

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)
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/tCLCL = 3.5 to 40MHz Unit
Min. Max. Min. Max.
ALE pulse width tLHLL 35 - 2tCLCL−15 - ns
Address setup to ALE tAVLL 10 - tCLCL−15 - ns
Address hold after ALE tLLAX 10 - tCLCL−15 - ns
ALE low to valid instruction in tLLIV -55 -4t
CLCL−45 ns
ALE to PSEN tLLPL 10 - tCLCL−15 - ns
PSEN pulse width tPLPH 60 - 3tCLCL−15 - ns
PSEN to valid instruction in tPLIV -25 -3t
CLCL−50 ns
Input instruction hold after PSEN tPXIX 0- 0 - ns
Input instruction float after PSEN tPXIZ †-15 -t
CLCL−10 ns
Address valid after PSEN tPXAV †20 - tCLCL−5-ns
Address to valid instruction in tAVIV -65 -5t
CLCL−60 ns
Address float to PSEN tAZPL 5- 5 - ns