DS1554 Maxim, DS1554 Datasheet - Page 13

• Manufacturer Part Number: DS1554
• Description: The DS1554 is a full-function, year 2000-compliant (Y2KC), real-time clock/calendar (RTC) with an RTC alarm, watchdog timer, power-on reset, battery monitor, and 32k x 8 nonvolatile static RAM
• Manufacturer: Maxim

AC CHARACTERISTICS—READ CYCLE
(T
AC CHARACTERISTICS—WRITE CYCLE
(T
Read Cycle Time
Address Access Time
Output Hold from Address
Write Cycle Time
Address Access Time
Data Setup Time
Data Hold Time (Note 9)
Data Hold Time (Note 10)
Address Hold Time (Note 9)
Address Hold Time
(Note 10)
Write Recovery Time
CE
CE
CE
OE
OE
OE
WE
CE
WE
A
A
= Over the operating range)
= Over the operating range)
to DQ Low-Z
Access Time
Data Off Time
to DQ Low-Z
Access Time
Data Off Time
Pulse Width
Pulse Width
Data Off Time
PARAMETER
PARAMETER
SYMBOL
SYMBOL
t
t
t
t
t
t
t
t
t
t
t
t
t
t
WEW
t
t
t
t
CEW
OEA
t
t
WEZ
CEL
CEA
CEZ
OEL
OEZ
DH1
DH2
AH1
AH2
WC
WR
RC
AA
OH
AS
DS
MIN
MIN
V
V
70
70
50
60
30
5
5
5
0
5
5
5
5
5
DS1554 256k, Nonvolatile, Y2K-Compliant Timekeeping RAM
CC
CC
13 of 18
= 5.0V 10%
= 5.0V 10%
MAX
MAX
70
70
25
35
25
25
V
V
MIN
MIN
CC
CC
120
100
110
120
80
10
0
5
5
0
5
5
5
5
= 3.3V 10%
= 3.3V 10%
MAX
MAX
120
120
100
40
40
35
UNITS
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns