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DS1501WZ+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22
DS1501/DS1511 Y2KC Watchdog Real-Time Clocks
4 of 22
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 SYMBOL CONDITIONS MIN TYP MAX UNITS
Read Cycle Time
t
RC
120 ns
Address Access Time
t
AA
120 ns
CE to DQ Low-Z
t
CEL
(Note 8) 5 ns
CE Access Time
t
CEA
120 ns
CE Data Off Time
t
CEZ
(Note 8) 40 ns
OE to DQ Low-Z (0°C to +85°C)
t
OEL
(Note 8) 5 ns
OE to DQ Low-Z (-40°C to 0°C)
t
OEL
(Note 8) 2 ns
OE Access Time
t
OEA
100 ns
OE Data-Off Time
t
OEZ
(Note 8) 35 ns
Output Hold from Address
t
OH
5 ns
Write Cycle Time
t
WC
120 ns
Address Setup Time
t
AS
0 ns
WE Pulse Width
t
WEW
100 ns
CE Pulse Width
t
CEW
110 ns
Data Setup Time
t
DS
80 ns
Data Hold Time
t
DH
5 ns
Address Hold Time
t
AH
5 ns
WE Data-Off Time
t
WEZ
(Note 8) 40 ns
Write Recovery Time
t
WR
15 ns
Pulse Width, OE, WE, or CE High
PW
HIGH
40 ns
Pulse Width, OE, WE, or CE Low
PW
LOW
100 ns
Figure 1. Read Cycle Timing
t
RC
t
CEA
t
OEA
t
CEL
t
OEL
t
OH
t
OEZ
t
AA
VALID
DQ0-DQ7
O
E
C
E
A0–A4
t
CEZ
DS1501/DS1511 Y2KC Watchdog Real-Time Clocks
5 of 22
Figure 2. Write Cycle Timing, Write-Enable Controlled
t
WC
t
AH
t
DS
t
AS
t
WEZ
t
DH
t
WR
t
AS
DATA INPUT
DQ0–DQ7
W
E
C
E
A0–A4
DATA OUTPUT DATA INPUT
t
WEW
VALID VALID
Figure 3. Write Cycle Timing, Chip-Enable Controlled
t
WC
t
A
H
t
D
S
t
AS
t
D
H
t
W
R
t
AS
DATA INPUT
DQ0-DQ7
WE
CE
A0-A4
DATA INPUT
t
C
E
W
VALID VALID
DS1501/DS1511 Y2KC Watchdog Real-Time Clocks
6 of 22
Figure 4. Burst Mode Timing Waveform
A0–A4
DQ0–DQ7
O
E
,
E
,
OR
C
E
13h
PW
HIGH
PW
LOW
POWER-UP/DOWN CHARACTERISTICS
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
t
PF
0
μs
CE or WE at V
IH
Before Power-Fail
V
CC
Fall Time: V
PF(MAX)
to V
PF(MIN)
t
F
300
μs
V
CC
Fall Time: V
PF(MIN)
to V
SO
t
FB
10
μs
V
CC
Rise Time: V
PF(MIN)
to V
PF(MAX)
t
R
0
μs
t
REC
35 200 ms
V
PF
to RST High
(T
A
= +25°C)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Expected Data-Retention Time
(Oscillator On)
t
DR
(Note 9) 10 Years
CAPACITANCE
(T
A
= +25°C)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Capacitance on All Input Pins C
IN
10 pF
Capacitance on IRQ, PWR, RST, and DQ
Pins
C
IO
10 pF
AC TEST CONDITIONS
INPUT PULSE
LEVELS
TIMING MEASUREMENT
REFERENCE LEVELS
INPUT PULSE RISE
AND FALL TIMES
OUTPUT LOAD
(Y) 50pF + 1TTL Gate Input: 1.5V
0V to 3.0V for 5V
operation
Output: 1.5V
5ns
(W) 25pF + 1 TTL Gate
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22

DS1501WZ+

Mfr. #:
Buy DS1501WZ+
Manufacturer:
Maxim Integrated
Description:
Real Time Clock Y2K-Compliant Watchdog
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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