DS1644 Maxim, DS1644 Datasheet - Page 8

• Manufacturer Part Number: DS1644
• Description: The DS1644 is a 32k x 8 nonvolatile static RAM with a full function real time clock, which are both accessible in a byte-wide format
• Manufacturer: Maxim

AC ELECTRICAL CHARACTERISTICS
AC TEST CONDITIONS
Input Levels:
Transition Times:
CAPACITANCE
AC ELECTRICAL CHARACTERISTICS
(POWER-UP/DOWN TIMING)
PARAMETER
Read Cycle Time
Address Access Time
Output Enable Access Time
Output Enable Data Off Time
Output Enable to DQ Low-Z
Output Hold from Address
Write Cycle Time
Address Setup Time
Address Hold from End of Write
Write Pulse Width
Data Setup Time
Data Hold Time High
PARAMETER
Capacitance on all pins (except DQ)
Capacitance on DQ pins
PARAMETER
V
V
V
V
Power-Up
Expected Data Retention Time
(Oscillator On)
CE
CE
CE
CE
CE
WE
WE
PF
PF
SO
PF
Access Time
Data Off Time
to DQ Low-Z
Pulse Width
or
(Max) to V
(Min) to V
(Min) to V
to V
Data Off Time
or
WE
CE
PF
(Min) V
Inactive Time
at V
SO
PF
PF
IH
(Max) V
V
(Min) V
before Power Down
CC
CC
0V to 3V
5 ns
Fall Time
Rise Time
CC
CC
Fall Time
Rise Time
SYMBOL
SYMBOL
SYMBOL
t
t
t
t
C
t
t
t
t
t
t
t
t
t
t
t
WEW
t
t
t
t
CEW
WEZ
t
t
CEA
OEA
t
t
t
t
CEZ
OEZ
OEL
CEL
AH1
AH2
DH1
DH2
REC
C
WC
WR
AA
OH
t
RC
AS
DS
PD
t
RB
DR
FB
DQ
R
F
8 of 14
I
MIN
MIN
MIN
120
120
100
300
30
75
10
85
15
10
15
10
5
5
5
0
5
0
0
1
0
TYP
TYP
TYP
(Over the Operating Range)
(Over the Operating Range)
MAX
MAX
MAX
120
120
100
40
40
40
10
35
7
UNITS
UNITS
UNITS
years
ms
pF
pF
s
s
s
s
s
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
(T
DS1644/DS1644P
A
= +25C)
NOTES
NOTES
NOTES
5
6
5
6
4