DS1557 Maxim, DS1557 Datasheet - Page 12

• Manufacturer Part Number: DS1557
• Description: The DS1557 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 512k x 8 nonvolatile static RAM
• Manufacturer: Maxim

AC CHARACTERISTICS—READ CYCLE
(T
AC CHARACTERISTICS—WRITE CYCLE
(T
Read Cycle Time
Address Access Time
CE to DQ Low-Z
CE Access Time
CE Data Off Time
OE to DQ Low-Z
OE Access Time
OE Data Off Time
Output Hold from Address
Write Cycle Time
Address Access Time
WE Pulse Width
CE Pulse Width
Data Setup Time
Data Hold Time (Note 9)
Data Hold Time (Note 10)
Address Hold Time (Note 9)
Address Hold Time
(Note 10)
WE Data Off Time
Write Recovery Time
A
A
= Over the Operating Range)
= Over the Operating Range)
PARAMETER
PARAMETER
SYMBOL
SYMBOL
t
t
t
t
t
t
t
t
t
t
t
t
t
t
WEW
t
t
t
t
t
CEW
WEZ
CEA
OEA
t
CEL
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
CC
CC
12 of 17
= 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