DS1501/DS1511 Y2KC Watchdog Real-Time Clocks
AC OPERATING CHARACTERISTICS
(V
CC
= 3.3V ±10%,
T
A
= 0°C to +70°C;
V
CC
= 3.3V ±10%,
T
A
= -40°C to +85°C.)
PARAMETER
Read Cycle Time
Address Access Time
CE
to DQ Low-Z
CE
Access Time
CE
Data Off Time
OE
to DQ Low-Z (0°C to +85°C)
OE
to DQ Low-Z (-40°C to 0°C)
OE
Access Time
OE
Data-Off Time
Output Hold from Address
Write Cycle Time
Address Setup Time
WE
Pulse Width
CE
Pulse Width
Data Setup Time
Data Hold Time
Address Hold Time
WE
Data-Off Time
Write Recovery Time
Pulse Width,
OE
,
WE
, or
CE
High
Pulse Width,
OE
,
WE
, or
CE
Low
SYMBOL
t
RC
t
AA
t
CEL
t
CEA
t
CEZ
t
OEL
t
OEL
t
OEA
t
OEZ
t
OH
t
WC
t
AS
t
WEW
t
CEW
t
DS
t
DH
t
AH
t
WEZ
t
WR
PW
HIGH
PW
LOW
CONDITIONS
MIN
120
5
120
40
5
2
100
35
5
120
0
100
110
80
5
5
(Note 8)
15
40
100
40
TYP
MAX
120
(Note 8)
(Note 8)
(Note 8)
(Note 8)
(Note 8)
UNITS
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Figure 1. Read Cycle Timing
t
RC
A0–A4
t
AA
CE
t
CEA
t
CEZ
t
OH
t
CEL
OE
t
OEA
t
OEZ
t
OEL
DQ0-DQ7
VALID
4 of 20
DALLAS [ DALLAS SEMICONDUCTOR ]
