SAB80C515A-5 Datasheet, PDF (97/108 Pages) Siemens Semiconductor Group – 8-Bit CMOS Single-Chip Microcontroller Family

SAB 80C515A/83C515A-5
Notes for page 44:
1) Capacitive loading on ports 0 and 2 may cause spurious noise pulses to be superimposed
on the V_OL of ALE and ports 1, 3, 4 and 5. 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.
2) Capacitive loading on ports 0 and 2 may cause the V _OH on ALE and PSEN to momentarily
fall below the 0.9 V_CC specification when the address lines are stabilizing.
3) I_PD (Software Power Down Mode) is measured under following conditions:
EA = RESET = V_CC; Port0 = Port6 = V_CC; XTAL1 = N.C.; XTAL2 = V_SS;
PE/SWD = V_SS; HWPD = V_CC; V _AGND = V _SS; V_ARef = V_CC; all other pins are
disconnected.
I_PD (Hardware Power Down Mode): independent of any particular pin connection.
4) I_CC (active mode) is measured with:
XTAL2 driven with t_CLCH, t_CHCL = 5 ns, V _IL = V_SS + 0.5 V, V_IH = V _CC – 0.5 V; XTAL1 = N.C.;
EA = PE/SWD = V_CC; Port0 = Port6 = V_CC; HWPD = V_CC; RESET = V_SS;
all other pins are disconnected. I_CC would be slightly higher if a crystal oscillator is used (ap-
pr. 1 mA).
5) I_CC (Idle mode) is measured with all output pins disconnected and with all peripherals dis-
abled; XTAL2 driven with t _CLCH, t _CHCL = 5 ns, V_IL = V _SS + 0.5 V, V_IH = V _CC – 0.5 V; XTAL1
= N.C.; RESET = V_CC; HWPD = V_CC; Port0 = Port6 = V_CC; EA = PE/SWD = V_SS; all other
pins are disconnected;
6) I_CC (slow down mode) is measured with all output pins disconnected and with all peripherals
disabled;
XTAL2 driven with t_CLCH, t _CHCL = 5 ns, V_IL = V _SS + 0.5 V, V_IH = V_CC – 0.5 V; XTAL1 =
N.C.; RESET = V_CC; HWPD = V_CC; Port6 = V_CC; EA = PE/SWD = V_SS; all other pins are
disconnected;
7) I_CC Max at other frequencies is given by:
active mode:I_CC (max) = 1.5 _* f_OSC + 8
idle mode:I_CC (max)= 0.4 _* f_OSC + 7
where f_OSC is the oscillator frequency in MHz. I_CC values are given in mA and
measured at V_CC = 5 V.
Semiconductor Group
6-45