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4.3
AC Characteristics
(1) Vcc = 3.0 V ± 10%
No.
Parameter
period ( = x)
1
f
FPH
A0 to A23 valid →
2
/
RD
WR
rise → A0 to A23 hold
3
RD
rise → A0 to A23 hold
4
WR
A0 to A23 valid → D0 to D15 input
5
fall → D0 to D15 input
6
RD
7
low width
RD
rise → D0 to A15 hold
8
RD
low width
9
WR
D0 to D15 valid →
rise
10
WR
rise → D0 to D15 hold
11
WR
A0 to A23 valid →
12
WAIT
fall →
/
hold
13
RD
WR
WAIT
A0 to A23 valid → Port input
14
A0 to A23 valid → Port hold
15
A0 to A23 valid → Port valid
16
AC measuring conditions
•
Output level: High = 0.7 Vcc, Low = 0.3 Vcc, CL = 50 pF
•
Input level:
Note: Symbol x in the above table means the period of clock f
f
for CPU core. The period of f
SYS
high/low oscillator frequency.
Symbol
t
FPH
fall
t
AC
0.5x −13
t
CAR
t
CAW
t
AD
t
RD
2.5x − 15
t
RR
t
HR
2.0x − 15
t
WW
1.5x − 35
t
DW
t
WD
(1 + N) WAIT
input
t
AW
mode
(1 + N) WAIT
t
2.5x + 0
CW
mode
t
APH
t
APH2
t
APO
High = 0.9 Vcc, Low = 0.1 Vcc
depends on the clock gear setting or the selection of
FPH
91C824-222
Variable
f
FPH
Min
Max
Min
30.3
31250
30.3
x − 23
7
2
x − 13
17
3.5x − 24
2.5x − 24
60
0
0
45
10
x − 25
5
3.5x − 60
76
3.5x − 89
3.5x
106
3.5x + 60
, it's half period of the system clock
FPH
TMP91C824
= 33 MHz
Unit
Max
ns
ns
ns
ns
82
ns
51
ns
ns
ns
ns
ns
ns
46
ns
ns
17
ns
ns
166
ns
2008-02-20
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