472
20.1.3
AC Characteristics
The following AC timing chart represents the AC characteristics, not signal functions. For signal
functions, see the explanation in the text.
(
1
)
Clock Timing
Table 20.4
Clock Timing
Case A: V
CC
= 3.0 to 5.5 V, AV
CC
= 3.0 to 5.5 V, AV
CC
= V
CC
±10%, AV
ref
= 3.0 V to AV
CC
,
V
SS
= AV
SS
= 0 V, Ta = –20 to +75°C*)
Case B: V
CC
= 5.0 V ±10%, AV
CC
= 5.0 V ±10%, AV
CC
= V
CC
±10%, AV
ref
= 4.5 V to AV
CC
,
V
SS
= AV
SS
= 0 V, Ta = –20 to +75°C*)
Note: * Regular-specification products; for wide-temperature-range products, Ta = –40 to +85°C
Case A
Case B
Sym-
12.5 MHz
20 MHz
Item
bol
Min
Max
Min
Max
Unit
Figures
EXTAL input high level
pulse width
t
EXH
20
—
10
—
ns
20.1
EXTAL input low level
pulse width
t
EXL
20
—
10
—
ns
EXTAL input rise time
t
EXr
—
10
—
5
ns
EXTAL input fall time
t
EXf
—
10
—
5
ns
Clock cycle time
t
cyc
80
500
50
500
ns
20.1, 20.2
Clock high pulse width
t
CH
30
—
20
—
ns
20.2
Clock low pulse width
t
CL
30
—
20
—
ns
Clock rise time
t
Cr
—
10
—
5
ns
Clock fall time
t
Cf
—
10
—
5
ns
Reset oscillation settling
time
t
OSC1
10
—
10
—
ms
20.3
Software standby
oscillation settling time
t
OSC2
10
—
10
—
ms
Содержание HD6417032
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Страница 525: ...490 CK RAS CAS TRp TRc TRcc tRASD1 tRASD2 tCASD3 tCASD2 TRr tCSR Figure 20 18 Self Refresh ...
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