GMS90 Series
AC Characteristics for GMS90 series (33MHz version)
CC= 5V + 10%, −15%; VSS= 0V; TA= 0°C to 70°C
V
(CL for port 0. ALE and PSEN outputs = 100pF; CL for all other outputs = 80pF)
External Program Memory Characteristics
33 MHz Oscillator
Variable Oscillator
1/tCLCL = 3.5 to 33MHz
Parameter
Symbol
Unit
Min.
40
10
10
-
Max.
Min.
Max.
tLHLL
-
-
2tCLCL-20
-
ALE pulse width
ns
ns
ns
ns
ns
ns
ns
ns
tAVLL
tLLAX
tLLIV
tCLCL-20
-
Address setup to ALE
-
tCLCL-20
-
Address hold after ALE
ALE low to valid instruction in
ALE to PSEN
56
-
-
4tCLCL-65
tLLPL
tPLPH
tPLIV
tPXIX
15
80
-
tCLCL-15
-
-
3tCLCL-20
-
PSEN pulse width
35
-
-
0
-
3tCLCL-55
-
PSEN to valid instruction in
Input instruction hold after PSEN
Input instruction float after PSEN
0
†
-
20
tCLCL-10
ns
ns
tPXIZ
†
25
-
tCLCL-5
-
Address valid after PSEN
Address to valid instruction in
Address float to PSEN
tPXAV
tAVIV
tAZPL
-
91
-
-
5tCLCL-60
-
ns
ns
0
0
†
Interfacing the GMS90 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.
38
Dec. 1998 Ver 3.0
HYNIX [ HYNIX SEMICONDUCTOR ]
