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Bus RTC. DS3234 Datasheet

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Bus RTC. DS3234 Datasheet






DS3234 RTC. Datasheet pdf. Equivalent




DS3234 RTC. Datasheet pdf. Equivalent





Part

DS3234

Description

Extremely Accurate SPI Bus RTC



Feature


www.DataSheet4U.com Rev 0; 2/06 Extreme ly Accurate SPI Bus RTC with Integrated Crystal and SRAM General Description T he DS3234 is a low-cost, extremely accu rate SPI™ bus real-time clock (RTC) w ith an integrated temperaturecompensate d crystal oscillator (TCXO) and crystal . The DS3234 incorporates a precision, temperature-compensated voltage referen ce and comparator ci.
Manufacture

Maxim Integrated Products

Datasheet
Download DS3234 Datasheet


Maxim Integrated Products DS3234

DS3234; rcuit to monitor VCC. When VCC drops bel ow the power-fail voltage (VPF), the de vice asserts the RST output and also di sables read and write access to the par t when VCC drops below both VPF and VBA T. The RST pin is monitored as a pushbu tton input for generating a reset exter nally. The device switches to the backu p supply input and maintains accurate t imekeeping when ma.


Maxim Integrated Products DS3234

in power to the device is interrupted. T he integration of the crystal resonator enhances the long-term accuracy of the device as well as reduces the piece-pa rt count in a manufacturing line. The D S3234 is available in commercial and in dustrial temperature ranges, and is off ered in an industry-standard 300-mil, 2 0-pin SO package. The DS3234 also integ rates 256 bytes of.


Maxim Integrated Products DS3234

battery-backed SRAM. In the event of ma in power loss, the contents of the memo ry are maintained by the power source c onnected to the VBAT pin. The RTC maint ains seconds, minutes, hours, day, date , month, and year information. The date at the end of the month is automatical ly adjusted for months with fewer than 31 days, including corrections for leap year. The clock o.

Part

DS3234

Description

Extremely Accurate SPI Bus RTC



Feature


www.DataSheet4U.com Rev 0; 2/06 Extreme ly Accurate SPI Bus RTC with Integrated Crystal and SRAM General Description T he DS3234 is a low-cost, extremely accu rate SPI™ bus real-time clock (RTC) w ith an integrated temperaturecompensate d crystal oscillator (TCXO) and crystal . The DS3234 incorporates a precision, temperature-compensated voltage referen ce and comparator ci.
Manufacture

Maxim Integrated Products

Datasheet
Download DS3234 Datasheet




 DS3234
DS3234
Extremely Accurate SPI Bus RTC
with Integrated Crystal and SRAM
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
VCC. When VCC drops below the power-fail voltage (VPF),
the device asserts the RST output and also disables read
and write access to the part when VCC drops below both
VPF and VBAT. 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 VBAT 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
Telematics
Utility Power Meters
GPS
Underwriters Laboratories Inc. is a registered certification mark
of Underwriters Laboratories Inc.
Benefits and Features
Highly Accurate RTC with Integrated Crystal and
SRAM Completely Manages All Timekeeping
Functions
Accuracy ±2ppm from 0°C to +40°C
Accuracy ±3.5ppm from -40°C to +85°C
Real-Time Clock Counts Seconds, Minutes, Hours,
Day, Date, Month, and Year, with Leap Year
Compensation Valid Up to 2099
Digital Temp Sensor Output: ±3°C Accuracy
Register for Aging Trim
RST Input/Output
Two Time-of-Day Alarms
Programmable Square-Wave Output
Simple Serial Interface Connects to Most
Microcontrollers
4MHz SPI Bus Supports Modes 1 and 3
Battery-Backup Input for Continuous Timekeeping
Low Power Operation Extends Battery Backup Run
Time
Operating Temperature Ranges: Commercial: 0°C to
+70°C, Industrial: -40°C to +85°C
300-Mil, 20-Pin SO Package
Underwriters Laboratories® (UL) Recognized
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
#Denotes an RoHS-compliant device that may include lead(Pb)
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 an RoHS-compliant device.
Typical Operating Circuit
VCC
SS
SCLK
MOSI
MISO
RST
µP
PUSH-
BUTTON
RESET
VCC VPU
CS
SCLK
DIN
DOUT
RST
N.C.
N.C.
N.C.
N.C.
N.C.
VCC
INT/SQW
32kHz
VBAT
DS3234
N.C.
N.C.
N.C.
GND N.C.
19-5339; Rev 4; 3/15




 DS3234
DS3234
Extremely Accurate SPI Bus RTC
with Integrated Crystal and SRAM
Absolute Maximum Ratings
Voltage Range on Any Pin Relative to Ground......-0.3V to +6.0V
Junction-to-Ambient Thermal Resistance (θJA) (Note 1) ...55°C/W
Junction-to-Case Thermal Resistance (θJC) (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.)
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.maximintegrated.com/thermal-tutorial.
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.
Recommended Operating Conditions
(TA = -40°C to +85°C, unless otherwise noted.) (Notes 2, 3)
PARAMETER
SYMBOL
CONDITIONS
Supply Voltage
VCC
VBAT
Logic 1 Input CS, SCLK, DIN
VIH
Logic 0 Input CS, SCLK, DIN,
RST
VIL 2.0V  VCC  3.63V
3.63V < VCC  5.5V
MIN
2.0
2.0
0.7 x
VCC
-0.3
-0.3
TYP
3.3
3.0
MAX
5.5
3.8
VCC +
0.3
+0.2 x
VCC
+0.7
UNITS
V
V
V
Electrical Characteristics
(VCC = 2.0V to 5.5V, VCC = active supply (see Table 1), TA = -40°C to +85°C, unless otherwise noted.) (Typical values are at VCC =
3.3V, VBAT = 3.0V, and TA = +25°C, unless otherwise noted. TCXO operation guaranteed from 2.3V to 5.5V on VCC and 2.3V to 3.8V on
VBAT.) (Notes 2, 3)
PARAMETER
Active Supply Current
Standby Supply Current
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
ICCA
SCLK = 4MHz, BSY = 0
(Notes 4, 5)
VCC = 3.63V
VCC = 5.5V
400
µA
700
ICCS
CS = VIH, 32kHz output off,
SQW output off
(Note 5)
VCC = 3.63V
VCC = 5.5V
120
µA
160
Temperature Conversion Current
ICCSCONV
SPI bus inactive, 32kHz
output off, SQW output off
VCC = 3.63V
VCC = 5.5V
Power-Fail Voltage
VPF
VBAT Leakage Current
IBATLKG
(VCC = 2.0V to 5.5V, TA = -40°C to +85°C, unless otherwise noted.) (Notes 2 and 3)
500
600
2.45 2.575 2.70
25 100
µA
V
nA
Logic 1 Output, 32kHz
IOH = -500µA
IOH = -250µA
IOH = -125µA
VCC > 3.63V,
VOH
3.63V > VCC > 2.7V,
2.7V > (VCC or VBAT) > 2.0V
(BB32kHz = 1)
0.85 x VCC
V
www.maximintegrated.com
Maxim Integrated | 2




 DS3234
DS3234
Extremely Accurate SPI Bus RTC
with Integrated Crystal and SRAM
Electrical Characteristics (continued)
(VCC = 2.0V to 5.5V, VCC = active supply (see Table 1), TA = -40°C to +85°C, unless otherwise noted.) (Typical values are at VCC =
3.3V, VBAT = 3.0V, and TA = +25°C, unless otherwise noted. TCXO operation guaranteed from 2.3V to 5.5V on VCC and 2.3V to 3.8V on
VBAT.) (Notes 2, 3)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Logic 0 Output, 32kHz
Logic 1 Output, DOUT
Logic 0 Output, DOUT, INT/SQW
Logic 0 Output, RST
VOL
VOH
VOL
VOL
IOL = 1mA
IOH = -1.0mA
IOL = 3mA
IOL = 1.0mA
0.85 x VCC
0.4 V
V
0.4 V
0.4 V
Output Leakage Current 32kHz,
INT/SQW, DOUT
ILO Output high impedance
-1 0 +1 µA
Input Leakage DIN, CS, SCLK
RST Pin I/O Leakage
ILI
IOL RST high impedance (Note 6)
-1
-200
+1
+10
TCXO (VCC = 2.3V to 5.5V, VBAT = 2.3V to 3.8V, TA = -40°C to +85°C, unless otherwise noted.) (Notes 2 and 3)
Output Frequency
fOUT VCC = 3.3V or VBAT = 3.3V
32.768
Frequency Stability vs.
Temperature
Δf/fOUT
VCC = 3.3V or
VBAT = 3.3V
0°C to +40°C
-40°C to 0°C and
+40°C to +85°C
-2
-3.5
+2
+3.5
µA
µA
kHz
ppm
Frequency Stability vs. Voltage
Δf/V
1 ppm/V
-40°C
0.7
Trim Register Frequency
Sensitivity per LSB
Δf/LSB Specified at:
+25°C
+70°C
0.1
ppm
0.4
+85°C
0.8
Temperature Accuracy
Temp
-3 +3 °C
Crystal Aging
Δf/fOUT
After reflow,
not production tested
First year
0–10 years
±1.0
±5.0
ppm
Electrical Characteristics
(VCC = 0V, VBAT = 2.0V to 3.8V, TA = -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Timekeeping Battery Current
(Note 5)
Temperature Conversion Current
Data-Retention Current
IBATT
IBATTC
IBATTDR
EOSC = 0, BBSQW = 0,
CRATE1 = CRATE0 = 0
EOSC = 0, BBSQW = 0
EOSC = 1
VBAT = 3.4V
VBAT = 3.8V
1.5 2.3
1.5 2.5
400
100
µA
µA
nA
www.maximintegrated.com
Maxim Integrated | 3



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