DS1254 Maxim, DS1254 Datasheet - Page 8

• Manufacturer Part Number: DS1254
• Description: The DS1254 is a fully nonvolatile static RAM (NV SRAM) (organized as 2M words by 8 bits) with built-in real-time clock
• Manufacturer: Maxim

AC ELECTRICAL CHARACTERISTICS
(V
POWER-UP/POWER-DOWN CHARACTERISTICS
(V
(T
WARNING: Under no circumstances are negative undershoots, of any amplitude, allowed when
device is in battery-backup mode.
Read Cycle Time
Address Access Time
OE to Output Valid
CE to Output Valid
CE or OE to Output Active
Output High-Z from Deselection
Output Hold from Address Change
Write Cycle Time
WE, CE Pulse Width
Address Setup Time
Address Hold Time
Output High-Z from WE
Output Active from WE
Data Setup Time
Data Hold Time
Read Recovery (Clock Access Only)
Write Recovery (Clock Access Only)
CE and WE at V
V
V
V
V
V
Expected Data-Retention Time (Oscillator On)
A
CC
CC
CC
CC
CC
CC
CC
= +25
= 3.3V 10%, T
= 3.3V 10%)
Fall Time: V
Fall Time: V
Rise Time: 0V to V
Valid to End of Write Protection
Valid to BW Valid

C)
PARAMETER
IH
PF(MAX)
PF(MIN)
PARAMETER
PARAMETER
Before Power-Down
A
= 0
to V
to V
PF(MIN)

C to +70
BAT
PF(MIN)

C.)
SYMBOL
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
ODW
OEW
t
COE
t
AAC
AH1
AH2
DH1
DH2
WC
WP
AW
WR
RC
OE
CO
OD
OH
RR
DS
8 of 17
SYMBOL
SYMBOL
t
t
t
t
t
REC
BPU
t
PD
t
DR
FB
F
R
MIN
150
150
100
10
25
60
20
20
20
0
5
5
5
0
MIN
MIN
300
150
10
10
0
MAX
150
150
75
70
70
TYP
TYP
MAX
MAX
125
1
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
UNITS
UNITS
years
ms
s
s
s
s
s
NOTES
DS1254
NOTES
NOTES
2
2
5
6
7
2
2
8
6
8
3
4