C501 datasheet(32/48 Pages) INFINEON

32 / 48 page

C501

Semiconductor Group

1997-04-01

Notes:

Capacitive loading on ports 0 and 2 may cause spurious noise pulses to be superimposed on the

VOL 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 transitions during bus operation. In the worst case (capacitive loading > 100 pF), the noise

pulse on ALE line may exceed 0.8 V. 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.

Capacitive loading on ports 0 and 2 may cause the

VOH on ALE and PSEN to momentarily fall bellow the

0.9

VCC specification when the address lines are stabilizing.

IPD (Power Down Mode) is measured under following conditions:

EA = Port0 = VCC; RESET = VSS; XTAL2 = N.C.; XTAL1 = VSS; all other pins are disconnected.

ICC (active mode) is measured with:

XTAL1 driven with

tCLCH, tCHCL = 5 ns, VIL = VSS + 0.5 V, VIH = VCC – 0.5 V; XTAL2 = N.C.;

EA = Port0 = RESET=

VCC; all other pins are disconnected. ICC would be slightly higher if a crystal oscillator is

used (appr. 1 mA).

ICC (Idle mode) is measured with all output pins disconnected and with all peripherals disabled;

XTAL1 driven with

tCLCH, tCHCL = 5 ns, VIL = VSS + 0.5 V, VIH = VCC – 0.5 V; XTAL2 = N.C.;

RESET = EA =

VSS; Port0 = VCC; all other pins are disconnected;

ICC max at other frequencies is given by:

active mode:

ICC = 1.27 x fOSC + 5.73

idle mode:

ICC = 0.28 x fOSC + 1.45 (C501-L and C501-1R only)

where

fOSC is the oscillator frequency in MHz. ICC values are given in mA and measured at VCC = 5 V.

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