GMS90C3X Datasheet, PDF (31/59 Pages) Hynix Semiconductor – HYNIX SEMICONDUCTOR INC. 8-BIT SINGLE-CHIP MICROCONTROLLERS

GMS90 Series
1) Capacitive loading on ports 0 and 2 may cause spurious noise pulses to be superimposed on the V_OL of ALE and port 3.
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: > 50pF at 3.3V, > 100pF at 5V), the noise pulse on ALE
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.
2) Capacitive loading on ports 0 and 2 may cause the V_OH on ALE and PSEN to momentarily fall below the 0.9V_CC specifica-
tion when the address lines are stabilizing.
3) I_CC Max at other frequencies is given by:
active mode: I_CC = 1.27 × f_OSC + 5.73
idle mode: I_CC = 0.28 × f_OSC + 1.45 (except OTP devices)
where f_OSC is the oscillator frequency in MHz. I_CC values are given in mA and measured at V_CC = 5V.
4) I_CC (active mode) is measured with:
XTAL1 driven with t_CLCH, t_CHCL = 5ns, V_IL = V_SS + 0.5V, V_IH = V_CC - 0.5V; XTAL2 = N.C.;
EA = Port0 = RESET = V_CC; all other pins are disconnected. I_CC would be slightly higher if a crystal oscillator is used (appr.
1mA).
5) I_CC (Idle mode) is measured with all output pins disconnected and with all peripherals disabled;
XTAL1 driven with t_CLCH, t_CHCL = 5ns, V_IL = V_SS + 0.5V, V_IH = V_CC - 0.5V; XTAL2 = N.C.;
RESET = EA = V_SS; Port0 = V_CC; all other pins are disconnected;
6) I_PD (Power Down Mode) is measured under following conditions:
EA = Port0 = V_CC; RESET = V_SS; XTAL2 = N.C.; XTAL1 = V_SS; all other pins are disconnected.
Oct. 2000 Ver 3.1a
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