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DS1501WEN

Part # DS1501WEN
Description Real Time Clock Parallel 256Byte 28-Pin TSOP - Rail/Tube
Category IC
Availability Out of Stock
Qty 0
Qty Price
1 + $18.96738

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Technical Document


DISCLAIMER: The information provided herein is solely for informational purposes. Customers must be aware of the suitability of this product for their application, and consider that variable factors such as Manufacturer, Product Category, Date Codes, Pictures and Descriptions may differ from available inventory.

DS1501/DS1511 Y2KC Watchdog Real-Time Clocks
4 of 20
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 20
Figure 2. Write Cycle Timing, Write-Enable Controlled
Figure 3. Write Cycle Timing, Chip-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
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 20
Figure 4. Burst Mode Timing Waveform
A0–A4
DQ0–DQ7
O
E, WE, OR CE
13h
PW
HIGH
PW
LOW
POWER-UP/DOWN CHARACTERISTICS
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CE or WE at V
IH
Before Power-Fail
t
PF
0
ms
V
CC
Fall Time: V
PF(MAX)
to V
PF(MIN)
t
F
300
ms
V
CC
Fall Time: V
PF(MIN)
to V
SO
t
FB
10
ms
V
CC
Rise Time: V
PF(MIN)
to V
PF(MAX)
t
R
0
ms
V
PF
to RST High
t
REC
35 200 ms
(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
OUTPUT LOAD
INPUT PULSE
LEVELS
TIMING MEASUREMENT
REFERENCE LEVELS
INPUT PULSE RISE
AND FALL TIMES
(Y) 50pF + 1TTL Gate Input: 1.5V
(W) 25pF + 1 TTL Gate
0V to 3.0V for 5V
operation
Output: 1.5V
5ns
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