Page-4
Aug.1998
5. AC Characteristics
( CL=50pF,Ta=-40 to 85
)
V
DD
=3.0V±10%
V
DD
=5.0V±10%
Description
Symbol
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
Unit
CLK clock cycle
t
CLK
1200
600
ns
CLK H Pulse Width
t
WH
600
-
-
300
-
-
ns
CLK L Pulse Width
t
WL
600
-
-
300
-
-
ns
CE setup time
t
CS
300
-
-
150
-
-
ns
CE hold time
t
CH
400
-
-
200
-
-
ns
CE recovery time
t
CR
600
-
-
300
-
-
ns
CLK hold time
t
CKH
100
-
-
50
-
-
ns
Write DATA in setup time
t
DS
50
-
-
50
-
-
ns
Write DATA in hold time
t
DH
50
-
-
50
-
-
ns
Read DATA in delay time
t
RD
0
-
400
0
-
200
ns
Output disable delay time
t
RZ
-
-
200
-
-
100
ns
rise and fall time
t
RF
-
-
40
-
-
20
ns
FOUT duty ratio
( 32.768kHz output )
Duty
35
-
65
40
-
60
%
CLK
C E
CS
t
WL
t
WH
t
CH
t
CKH
t
CR
t
50%
50%
Write Mode
ReadMode
CLK
DATA
CLK
DATA
C E
Hi-Z
DS
t
DH
t
RF
t
RF
t
RZ
t
RD
t
C E
CS
t
%
50
%
50
%
50
%
50
%
90
%
10
%
90
%
10
%
50
%
50
°
C
