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DS1501WZ+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P22
DS1501/DS1511
Y2K-Compliant Watchdog Real-Time Clocks
GENERAL DESCRIPTION
The DS1501/DS1511 are full-function, year 2000-
compliant real-time clock/calendars (RTCs) with an
RTC alarm, watchdog timer, power-on reset, battery
monitors, 256 bytes NV SRAM, and a 32.768kHz
output. User access to all registers within the
DS1501/DS1511 is accomplished with a byte-wide
interface, as shown in
Figure 8. The RTC registers
contain century, year, month, date, day, hours,
minutes, and seconds data in 24-hour binary-coded
decimal (BCD) format. Corrections for day of month
and leap year are made automatically.
APPLICATIONS
Remote Systems
Battery-Backed Systems
Telecom Switches
Office Equipment
Consumer Electronics
Pin Configurations and Typical Operating Circuit appear at
end of data sheet.
FEATURES
BCD-Coded Century, Year, Month, Date, Day,
Hours, Minutes, and Seconds with Automatic
Leap-Year Compensation Valid Up to the Year
2100
Programmable Watchdog Timer and RTC
Alarm
Century Register; Y2K-Compliant RTC
+3.3 (W) or +5V (Y) Operation
Precision Power-On Reset
Power-Control Circuitry Support System
Power-On from Date/Day/Time Alarm or Key
Closure/Modem-Detect Signal
256 Bytes Battery-Backed SRAM
Auxiliary Battery Input
Accuracy of DS1511 Better than ±1
Minute/Month at +25°C
Day-of-Week/Date Alarm Register
Crystal Select Bit Allow RTC to Operate with
6pF or 12.6pF Crystal (DS1501)
Battery Voltage-Level Indicator Flags
Available as Chip (DS1501) or Stand-Alone
Encapsulated DIP Module with Embedded
Battery and Crystal (DS1511)
Underwriters Laboratories (UL) Recognized
ORDERING INFORMATION
PART VOLTAGE (V) TEMP RANGE
PIN-PACKAGE TOP MARK*
DS1501W+ 3.3
0°C to +70°C
28 DIP (0.600) DS1501W
DS1501WE+ 3.3
0°C to +70°C
28 TSOP DS1501WE
DS1501WEN+ 3.3
-40°C to +85°C
28 TSOP DS1501WEN
DS1501WEN+T&R 3.3
-40°C to +85°C
28 TSOP/Tape & Reel DS1501WEN
DS1501WE+T&R 3.3
0°C to +70°C
28 TSOP/Tape & Reel DS1501WE
+Denotes a lead(Pb)-free/RoHS-compliant package.
*A “+” anywhere on the top mark denotes a lead(Pb)-free device. An N or IND denotes an industrial temperature device.
Ordering Information continued at end of data sheet.
1 of 22
REV: 010909
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata
.
DS1501/DS1511 Y2KC Watchdog Real-Time Clocks
2 of 22
ABSOLUTE MAXIMUM RATINGS
Voltage Range on Any Pin Relative to Ground……………………………………………………..……....-0.5V to +6.0V
Operating Temperature Range, DS1501
………………………………………………..-40°C to +85°C (Note 1)
Operating Temperature Range, DS1511……………………………………………………………….……..0°C to +70°C
Storage Temperature Range, DS1501
…………………...…………………………………....-55°C to +125°C
Storage Temperature Range, DS1511………………………………………………………………….…..-40°C to +70°C
Soldering Temperature (DIP, EDIP Module)…..………...….+260°C lead temperature for 10 seconds (max) (Note 2)
Soldering Temperature (SO, TSOP)
…….………….…..See IPC/JEDEC J-STD-020 for surface-mount devices
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only,
and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is
not implied. Exposure to the absolute maximum rating conditions for extended periods may affect device reliability.
RECOMMENDED DC OPERATING CONDITIONS
(V
CC
= 3.3V or 5V ±10%, T
A
= 0°C to +70°C; V
CC
= 3.3V or 5V ±10%, T
A
= -40°C to +85°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
5V (Y) 4.5 5.0 5.5
Power Supply Voltage (Note 3) V
CC
3.3V (W) 3.0 3.3 3.6
V
Y 2.2 V
CC
+ 0.3
Logic 1 Voltage All Inputs (Note 3) V
IH
W 2.0 V
CC
+ 0.3
V
Pullup Voltage, IRQ, PWR, and
RST Outputs (Note 3)
V
PU
5.5 V
Y -0.3 +0.8
Logic 0 Voltage All Inputs (Note 3) V
IL
W -0.3 +0.6
V
Battery Voltage (Note 3) V
BAT
2.5 3.0 3.7 V
Y 2.5 3.0 5.3
Auxiliary Battery Voltage (Note 3) V
BAUX
W 2.5 3.0 3.7
V
DC ELECTRICAL CHARACTERISTICS
(V
CC
= 3.3V or 5V ±10%, T
A
= 0°C to +70°C; V
CC
= 3.3V or 5V ±10%, T
A
= -40°C to +85°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Y 15
Active Supply Current (Note 4) I
CC
W 10
mA
Y 5
TTL Standby Current (CE = V
IH
)
I
CC1
W 4
mA
Y 5
CMOS Standby Current
(CE = V
CC
- 0.2V)
I
CC2
W 4
mA
Input Leakage Current (Any Input) I
IL
-1 +1
μA
Output Leakage Current (Any Output) I
OL
-1 +1
μA
Output Logic 1 Voltage
(I
OUT
= -1.0mA)
V
OH
(Note 3) 2.4 V
V
OL1
(Note 3) 0.4 V
Output Logic 0 Voltage (I
OUT
= 2.1mA,
DQ0–7; I
OUT
= 5.0mA, IRQ, I
OUT
=
7.0mA, PWR and RST)
V
OL2
(Notes 3, 5) 0.4 V
Y 2.0
Battery Low, Flag Trip Point (Note 2) V
BLF
W 1.9
V
Y 4.20 4.50
Power-Fail Voltage (Note 2) V
PF
W 2.75 2.97
V
Battery Switchover Voltage (Notes 3, 6) V
SO
V
BAT,
V
BAUX,
or V
PF
V
Battery Leakage Current I
LKG
100 nA
DS1501/DS1511 Y2KC Watchdog Real-Time Clocks
3 of 22
DC ELECTRICAL CHARACTERISTICS
(V
CC
= 0V; T
A
= 0°C to +70°C; V
CC
= 0V, T
A
= -40°C to +85°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Battery Current, BB32 = 0, EOSC = 0
I
BAT1
(Note 7)
0.27 1.0
μA
Battery Current, BB32 = 0, EOSC = 1
I
BAT2
(Note 7)
0.01 0.1
μA
V
BAUX
Current BB32 = 1, SQW Open
I
BAUX
(Note 7)
2
μA
CRYSTAL SPECIFICATIONS*
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Nominal Frequency f
O
32.768 kHz
Series Resistance
ESR 45
kΩ
Load Capacitance C
L
6/12.5 pF
*The crystal, traces, and crystal input pins should be isolated from RF generating signals. Refer to Application Note 58: Crystal Considerations
for Dallas Real-Time Clocks for additional specifications.
AC OPERATING CHARACTERISTICS
(V
CC
= 5V ±10%, T
A
= 0°C to +70°C; V
CC
= 5V ±10%, T
A
= -40°C to +85°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Read Cycle Time t
RC
70 ns
Address Access Time t
AA
70 ns
CE to DQ Low-Z
t
CEL
(Note 8)
5 ns
CE Access Time
t
CEA
70 ns
CE Data-Off Time
t
CEZ
(Note 8)
25 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
35 ns
OE Data-Off Time
t
OEZ
(Note 8)
25 ns
Output Hold from Address t
OH
5 ns
Write Cycle Time
t
WC
70 ns
Address Setup Time
t
AS
0 ns
WE Pulse Width
t
WEW
50 ns
CE Pulse Width
t
CEW
55 ns
Data Setup Time
t
DS
30 ns
Data Hold Time
t
DH
5 ns
Address Hold Time
t
AH
0 ns
WE Data-Off Time
t
WEZ
(Note 8) 25 ns
Write Recovery Time
t
WR
15 ns
Pulse Width, OE, WE, or CE High
PW
HIGH
20 ns
Pulse Width, OE, WE, or CE Low
PW
LOW
70 ns
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.
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