Datasheet

DS1251/DS1251P
12 of 20
MEMORY AC ELECTRICAL CHARACTERISTICS
(T
A
= Over the operating range.) (3.3V)
PARAMETER 12BSYMBOL
13B
DS1251W-120
14BUNITS 15BNOTES
MIN
16B
MAX
Read Cycle Time
t
RC
120
ns
Access Time
t
ACC
120
ns
OE
to Output Valid
t
OE
60
ns
CE
to Output Valid
t
CO
120
ns
OE
or
CE
to Output Active
t
COE
5
ns
5
Output High-Z from Deselection
t
OD
40
ns
5
Output Hold from Address Change
t
OH
5
ns
Write Cycle Time
t
WC
120
ns
Write Pulse Width
t
WP
90
ns
3
Address Setup Time
t
AW
0
ns
Write Recovery Time
t
WR
20
ns
10
Output High-Z from
WE
t
ODW
40
ns
5
Output Active from
WE
t
OEW
5
ns
5
Data Setup Time
t
DS
50
ns
4
Data Hold Time from
WE
t
DH
20
ns
4
PHANTOM CLOCK AC ELECTRICAL CHARACTERISTICS
(T
A
= Over the operating range.) (3.3V)
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES
Read Cycle Time t
RC
120 ns
CE Access Time t
CO
100 ns
OE Access Time t
OE
100 ns
CE
to Output Low-Z
t
COE
5
ns
OE to Output Low-Z t
OEE
5 ns
CE to Output High-Z t
OD
40 ns 5
OE to Output High-Z t
ODO
40 ns 5
Read Recovery t
RR
20 ns
Write Cycle Time t
WC
120 ns
Write Pulse Width t
WP
100 ns 3
Write Recovery t
WR
20 ns 10
Data Setup Time t
DS
45 ns 4
Data Hold Time t
DH
0 ns 4
CE Pulse Width t
CW
105 ns
RST Pulse Width t
RST
120 ns