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DS3234S#

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21
General Description
The DS3234 is a low-cost, extremely accurate SPI™ bus
real-time clock (RTC) with an integrated temperature-com-
pensated crystal oscillator (TCXO) and crystal. The
DS3234 incorporates a precision, temperature-compen-
sated voltage reference and comparator circuit to monitor
V
CC
. When V
CC
drops below the power-fail voltage (V
PF
),
the device asserts the RST output and also disables read
and write access to the part when V
CC
drops below both
V
PF
and V
BAT
. The RST pin is monitored as a pushbutton
input for generating a µP reset. The device switches to the
backup supply input and maintains accurate timekeeping
when main power to the device is interrupted. The integra-
tion of the crystal resonator enhances the long-term accu-
racy of the device as well as reduces the piece-part count
in a manufacturing line. The DS3234 is available in com-
mercial and industrial temperature ranges, and is offered
in an industry-standard 300-mil, 20-pin SO package.
The DS3234 also integrates 256 bytes of battery-backed
SRAM. In the event of main power loss, the contents of
the memory are maintained by the power source con-
nected to the V
BAT
pin. The RTC maintains seconds,
minutes, hours, day, date, month, and year information.
The date at the end of the month is automatically adjust-
ed for months with fewer than 31 days, including correc-
tions for leap year. The clock operates in either the
24-hour or 12-hour format with AM/PM indicator. Two
programmable time-of-day alarms and a programmable
square-wave output are provided. Address and data are
transferred serially by an SPI bidirectional bus.
Applications
Servers Utility Power Meters
Telematics GPS
Features
♦ Accuracy ±2ppm from 0°C to +40°C
♦ Accuracy ±3.5ppm from -40°C to +85°C
♦ Battery Backup Input for Continuous
Timekeeping
♦ Operating Temperature Ranges
Commercial: 0°C to +70°C
Industrial: -40°C to +85°C
♦ Low-Power Consumption
♦ Real-Time Clock Counts Seconds, Minutes,
Hours, Day, Date, Month, and Year with Leap Year
Compensation Valid Up to 2099
♦ Two Time-of-Day Alarms
♦ Programmable Square-Wave Output
♦ 4MHz SPI Bus Supports Modes 1 and 3
♦ Digital Temp Sensor Output: ±3°C Accuracy
♦ Register for Aging Trim
♦ RST Input/Output
♦ 300-Mil, 20-Pin SO Package
♦ Underwriters Laboratories Recognized
DS3234
Extremely Accurate SPI Bus RTC with
Integrated Crystal and SRAM
______________________________________________
Maxim Integrated Products
1
19-5339; Rev 3; 7/10
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Ordering Information
PART TEMP RANGE
PIN-
PACKAGE
TOP
MARK
DS3234S# 0°C to +70°C 20 SO DS3234S
DS3234SN# -40°C to +85°C 20 SO DS3234SN
DS3234
CS
INT/SQW
32kHz
V
BAT
PUSH-
BUTTON
RESET
SCLK
RST
N.C.
N.C.
N.C.
V
CC
V
PU
V
CC
GND
V
CC
μP
SS
SCLK
DIN
MOSI
DOUT
MISO
RST
N.C.
N.C.
N.C.
N.C.
N.C.
N.C.
Typical Operating Circuit
#
Denotes a RoHS-compliant device that may include lead that
is exempt under the RoHS requirements. Lead finish is JESD97
Category e3, and is compatible with both lead-based and
lead-free soldering processes. A "#" anywhere on the top mark
denotes a RoHS-compliant device.
TOP VIEW
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
SCLK
DOUT
SCLK
DINV
CC
32kHz
N.C.
CS
V
BAT
GND
N.C.
N.C.N.C.
N.C.
RST
INT/SQW
12
11
9
10
N.C.
N.C.N.C.
N.C.
SO
DS3234
Pin Configuration
SPI is a trademark of Motorola, Inc.
DS3234
Extremely Accurate SPI Bus RTC with
Integrated Crystal and SRAM
2 _____________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED OPERATING CONDITIONS
(T
A
= -40°C to +85°C, unless otherwise noted.) (Notes 2, 3)
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
absolute maximum rating conditions for extended periods may affect device reliability.
Voltage Range on Any Pin Relative to Ground......-0.3V to +6.0V
Junction-to-Ambient Thermal Resistance (θ
JA
) (Note 1) ...55°C/W
Junction-to-Case Thermal Resistance (θ
JC
) (Note 1) ........24°C/W
Operating Temperature Range
(noncondensing) .............................................-40°C to +85°C
Junction Temperature......................................................+125°C
Storage Temperature Range ...............................-40°C to +85°C
Lead Temperature (soldering, 10s) .................................+260°C
Soldering Temperature (reflow, 2 times max) ....................+260°C
(See the
Handling, PC Board Layout, and Assembly
section.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
CC
2.0 3.3 5.5
Supply Voltage
V
BAT
2.0 3.0 3.8
V
Logic 1 Input CS, SCLK, DIN V
IH
0.7 x
V
CC
V
CC
+
0.3
V
2.0V V
CC
3.63V -0.3
+0.2 x
V
CC
Logic 0 Input CS, SCLK, DIN,
RST
V
IL
3.63V < V
CC
5.5V -0.3 +0.7
V
ELECTRICAL CHARACTERISTICS
(V
CC
= 2.0V to 5.5V, V
CC
= active supply (see Table 1), T
A
= -40°C to +85°C, unless otherwise noted.) (Typical values are at V
CC
=
3.3V, V
BAT
= 3.0V, and T
A
= +25°C, unless otherwise noted. TCXO operation guaranteed from 2.3V to 5.5V on V
CC
and 2.3V to 3.8V on
V
BAT
.) (Notes 2, 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
CC
= 3.63V 400
Active Supply Current I
CCA
SCLK = 4MHz, BSY = 0
(Notes 4, 5)
V
CC
= 5.5V 700
µA
V
CC
= 3.63V 120
Standby Supply Current I
CCS
CS = V
IH
, 32kHz output off,
SQW output off
(Note 5)
V
CC
= 5.5V 160
µA
V
CC
= 3.63V 500
Temperature Conversion Current I
CCSCONV
SPI bus inactive, 32kHz
output off, SQW output off
V
CC
= 5.5V 600
µA
Power-Fail Voltage V
PF
2.45 2.575 2.70 V
V
BAT
Leakage Current I
BATLKG
25 100 nA
(V
CC
= 2.0V to 5.5V, T
A
= -40°C to +85°C, unless otherwise noted.) (Notes 2 and 3)
Logic 1 Output, 32kHz
I
OH
= -500µA
I
OH
= -250µA
I
OH
= -125µA
V
OH
V
CC
> 3.63V,
3.63V > V
CC
> 2.7V,
2.7V > (V
CC
or V
BAT
) > 2.0V
(BB32kHz = 1)
0.85 x V
CC
V
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial
.
DS3234
Extremely Accurate SPI Bus RTC with
Integrated Crystal and SRAM
_____________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 2.0V to 5.5V, V
CC
= active supply (see Table 1), T
A
= -40°C to +85°C, unless otherwise noted.) (Typical values are at V
CC
=
3.3V, V
BAT
= 3.0V, and T
A
= +25°C, unless otherwise noted. TCXO operation guaranteed from 2.3V to 5.5V on V
CC
and 2.3V to 3.8V on
V
BAT
.) (Notes 2, 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Logic 0 Output, 32kHz V
OL
I
OL
= 1mA 0.4 V
Logic 1 Output, DOUT V
OH
I
OH
= -1.0mA 0.85 x V
CC
V
Logic 0 Output, DOUT, INT/SQW V
OL
I
OL
= 3mA 0.4 V
Logic 0 Output, RST V
OL
I
OL
= 1.0mA 0.4 V
Output Leakage Current 32kHz,
INT/SQW, DOUT
I
LO
Output high impedance -1 0 +1 µA
Input Leakage DIN, CS, SCLK I
LI
-1 +1 µA
RST Pin I/O Leakage I
OL
RST high impedance (Note 6) -200 +10 µA
TCXO (V
CC
= 2.3V to 5.5V, V
BAT
= 2.3V to 3.8V, T
A
= -40°C to +85°C, unless otherwise noted.) (Notes 2 and 3)
Output Frequency f
OUT
V
CC
= 3.3V or V
BAT
= 3.3V
32.768 kHz
0°C to +40°C -2 +2
Frequency Stability vs.
Temperature
Δf/f
OUT
V
CC
= 3.3V or
V
BAT
= 3.3V
-40°C to 0°C and
+40°C to +85°C
-3.5 +3.5
ppm
Frequency Stability vs. Voltage Δf/V 1 ppm/V
-40°C 0.7
+25°C 0.1
+70°C 0.4
Trim Register Frequency
Sensitivity per LSB
Δf/LSB Specified at:
+85°C 0.8
ppm
Temperature Accuracy Temp -3 +3 °C
First year ±1.0
Crystal Aging Δf/f
OUT
After reflow,
not production tested
0–10 years ±5.0
ppm
ELECTRICAL CHARACTERISTICS
(V
CC
= 0V, V
BAT
= 2.0V to 3.8V, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
BAT
= 3.4V 1.5 2.3
Timekeeping Battery Current
(Note 5)
I
BATT
EOSC = 0, BBSQW = 0,
CRATE1 = CRATE0 = 0
V
BAT
= 3.8V 1.5 2.5
µA
Temperature Conversion Current I
BATTC
EOSC = 0, BBSQW = 0 400 µA
Data-Retention Current I
BATTDR
EOSC = 1 100 nA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21

DS3234S#

Mfr. #:
Buy DS3234S#
Manufacturer:
Maxim Integrated
Description:
Real Time Clock Integrated RTC/TCXO/Crystal
Lifecycle:
New from this manufacturer.
Delivery:
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