GMS90 Hynix Semiconductor, GMS90 Datasheet - Page 31

• Manufacturer Part Number: GMS90
• Description: 8-BIT SINGLE-CHIP MICROCONTROLLERS
• Manufacturer: Hynix Semiconductor

GMS90 Series
1) Capacitive loading on ports 0 and 2 may cause spurious noise pulses to be superimposed on the V
2) Capacitive loading on ports 0 and 2 may cause the V
3) I
4) I
5) I
6) I
Dec. 1998 Ver 3.0
The noise is due to external bus capacitance discharging into the port 0 and port 2 pins when these pins make 1-to-0 tran-
sitions during bus operation. In the worst case (capacitive loading:
line may exceed 0.8V. In such cases it may be desirable to qualify ALE with a schmitt-trigger, or use an address latch with
a schmitt-trigger strobe input.
tion when the address lines are stabilizing.
active mode: I
idle mode:
where f
XTAL1 driven with t
EA = Port0 = RESET = V
1mA).
XTAL1 driven with t
RESET = EA = V
EA = Port0 = V
CC
CC
CC
PD
Max at other frequencies is given by:
(active mode) is measured with:
(Idle mode) is measured with all output pins disconnected and with all peripherals disabled;
(Power Down Mode) is measured under following conditions:
OSC
is the oscillator frequency in MHz. I
I
CC
CC
CC
SS
; RESET = V
= 1.27
= 0.28
CLCH
CLCH
; Port0 = V
, t
, t
CC
CHCL
CHCL
f
f
; all other pins are disconnected. I
OSC
OSC
CC
SS
= 5ns, V
= 5ns, V
+ 5.73
+ 1.45 (except OTP devices)
; all other pins are disconnected;
; XTAL2 = N.C.; XTAL1 = V
IL
IL
= V
= V
SS
SS
CC
+ 0.5V, V
+ 0.5V, V
values are given in mA and measured at V
OH
on ALE and PSEN to momentarily fall below the 0.9V
IH
IH
SS
= V
= V
CC
; all other pins are disconnected.
CC
CC
would be slightly higher if a crystal oscillator is used (appr.
- 0.5V; XTAL2 = N.C.;
- 0.5V; XTAL2 = N.C.;
50pF at 3.3V,
100pF at 5V), the noise pulse on ALE
CC
= 5V.
OL
of ALE and port 3.
CC
specifica-
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