HYUNDAI MicroElectronics
GMS90 Series
AC Characteristics for GMS90 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
40 MHz Oscillator
Variable Oscillator
1/tCLCL = 3.5 to 40MHz
Parameter
Symbol
Unit
Min.
35
10
10
-
Max.
Min.
Max.
tLHLL
-
-
2tCLCL−15
-
ALE pulse width
ns
ns
ns
ns
ns
ns
ns
ns
tAVLL
tLLAX
tLLIV
t
t
CLCL−15
CLCL−15
-
-
Address setup to ALE
-
-
Address hold after ALE
ALE low to valid instruction in
ALE to PSEN
55
-
4tCLCL−45
tLLPL
tPLPH
tPLIV
tPXIX
10
60
-
t
CLCL−15
-
-
3tCLCL−15
-
PSEN pulse width
25
-
-
0
-
3tCLCL−50
PSEN to valid instruction in
Input instruction hold after PSEN
Input instruction float after PSEN
0
-
†
-
15
t
CLCL−10
ns
ns
tPXIZ
†
20
-
t
CLCL−5
-
Address valid after PSEN
Address to valid instruction in
Address float to PSEN
tPXAV
tAVIV
tAZPL
-
65
-
-
5tCLCL−60
ns
ns
5
5
-
†
Interfacing the GMS90 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.
40
Oct. 2000 Ver 3.1a
HYNIX [ HYNIX SEMICONDUCTOR ]
