DS1643-120 DALLAS [Dallas Semiconductor], DS1643-120 Datasheet - Page 8

• Manufacturer Part Number: DS1643-120
• Description: Nonvolatile Timekeeping RAM
• Manufacturer: DALLAS [Dallas Semiconductor]

AC ELECTRICAL CHARACTERISTICS (POWER–UP/DOWN TIMING)
DS1643 READ CYCLE TIMING
DS1643
041697 8/11
PARAMETER
CE2, CE or WE at V
Power Down
V
V
V
V
V
V
V
V
Power–Up
Expected Data Retention Time
(Oscillator On)
PF
CC
PF
CC
SO
CC
PF
CC
A0–A12
CE
WE
DQ0–DQ7
OE
(Max) to V
(Min) to V
(Min) to V
Fall Time
Fall Time
to V
Rise Time
Rise Time
PF
(Min)
SO
PF
PF
(Max)
(Min)
IH
before
t
CEL
t
CEA
t
OEL
READ
t
t
OEA
RC
VALID OUT
SYMBOL
t
t
t
REC
t
t
PD
RB
t
DR
t
FB
R
F
t
OH
t
MIN
AA
300
10
15
10
0
1
0
READ
t
RC
VALID OUT
TYP
25
MAX
35
t
OEZ
t
AS
WRITE
t
t
WEW
WC
VALID IN
UNITS
years
ms
s
s
s
s
s
(0 C to 70 C)
t
WR
NOTES
t
4
AH