GMS90X5XC Series HYUNDAI MicroElectronics
Jan. 2001 Ver 1.0 35

AC Characteristics for GMS90X5XC series (33MHz 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 35 ns is permissible. This limited bus contention will not
cause
any damage to port 0 Drivers.
Parameter Symbol 33 MHz Oscillator Variable Oscillator
1/tCLCL = 3.5 to 33MHz Unit
Min. Max. Min. Max.
ALE pulse width tLHLL 40 - 2tCLCL-20 - ns
Address setup to ALE tAVLL 10 - tCLCL-20 - ns
Address hold after ALE tLLAX 10 - tCLCL-20 - ns
ALE low to valid instruction in tLLIV -56 -4t
CLCL-65 ns
ALE to PSEN tLLPL 15 - tCLCL-15 - ns
PSEN pulse width tPLPH 80 - 3tCLCL-20 - ns
PSEN to valid instruction in tPLIV -35 -3t
CLCL-55 ns
Input instruction hold after PSEN tPXIX 0- 0 - ns
Input instruction float after PSEN tPXIZ †-20 - t
CLCL-10 ns
Address valid after PSEN tPXAV †25 - tCLCL-5 - ns
Address to valid instruction in tAVIV -91 -5t
CLCL-60 ns
Address float to PSEN tAZPL 0- 0 - ns