AN2555 - Application note

Electrical characteristics

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5.2

AC characteristics at 40 MHz

As the technology is different between the two devices, the I/Os also present some differences in the AC

behavior. Table 13 and Table 14 list all the timing differences. Please check carefully your design for

possible impact.

5.2.1

External memory bus timings

Note that for high CPU clock frequencies above 40 MHz (when using the ST10F276Z5Q3), some

numbers in the timing formulas become zero or negative, that in most of the cases is not acceptable or

Output low

voltage (all

other)

–

1.6mA

–

mA

mA

V

Output high

voltage

2.4

PORT0,

PORT1, Port

4, ALE, RD,

WR, BHE,

CLKOUT,

RSTOUT

PORT6, ALE,

CLKOUT, WR,

READY, BHE,

RD, RSTOUT,

RSTIN

V

Output high

voltage (all

other)

2.4

–V

Input leakage

current (Port5)

–

± 200

–

± 200

nA

Input leakage

current (all

other)

–±1

–

±0.5

uA

Input leakage

current (P2.0)

–-

–

-0.5

+1

uA

Input leakage

current (RPD)

–-

–

±3

uA

Overload cur-

rent (P2.0)

–-

–

-1

+5

mA

Table 12.

DC characteristics

Parameter

Symbol

ST10F269Zx Limit Values

ST10F276Z5 Limit Values

Unit

min.

max.

min.

max.