DS3234S# Maxim Integrated Products, DS3234S# Datasheet

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DS3234S#

Manufacturer Part Number
DS3234S#
Description
IC RTC W/TCXO 20-SOIC
Manufacturer
Maxim Integrated Products
Type
Clock/Calendar/TCXO/Crystalr
Datasheet

Specifications of DS3234S#

Memory Size
2K (256 x 8)
Time Format
HH:MM:SS (12/24 hr)
Date Format
YY-MM-DD-dd
Interface
SPI, 3-Wire Serial
Voltage - Supply
2 V ~ 5.5 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
20-SOIC (7.5mm Width)
Function
Clock/Calendar/Alarm/Battery Backup/Interrupt
Rtc Memory Size
256 Byte
Supply Voltage (max)
5.5 V
Supply Voltage (min)
2 V
Maximum Operating Temperature
+ 70 C
Minimum Operating Temperature
0 C
Mounting Style
SMD/SMT
Rtc Bus Interface
Serial (4-Wire, SPI)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
DS3234S#DS3234S
Manufacturer:
MAXIM/美信
Quantity:
20 000
Company:
Part Number:
DS3234S#
Manufacturer:
Maxim
Quantity:
74
Company:
Part Number:
DS3234S#T&R
Quantity:
2 000
Company:
Part Number:
DS3234S#DS3234SN
Manufacturer:
MAXIM/美信
Quantity:
20 000
Company:
Part Number:
DS3234S#DS3234SN
0
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
the device asserts the RST output and also disables read
and write access to the part when V
V
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
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.
19-5339; Rev 3; 7/10
SPI is a trademark of Motorola, Inc.
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.
CC
PF
. When V
and V
V
μP
Servers
Telematics
CC
SCLK
MOSI
MISO
RST
BUTTON
SS
BAT
PUSH-
RESET
CC
. The RST pin is monitored as a pushbutton
Typical Operating Circuit
drops below the power-fail voltage (V
BAT
pin. The RTC maintains seconds,
General Description
CS
SCLK
DIN
DOUT
RST
N.C.
N.C.
N.C.
N.C.
N.C.
Extremely Accurate SPI Bus RTC with
Utility Power Meters
GPS
DS3234
GND
V
V
CC
CC
CC
Applications
INT/SQW
______________________________________________ Maxim Integrated Products
drops below both
32kHz
V
N.C.
N.C.
N.C.
N.C.
BAT
V
Integrated Crystal and SRAM
PU
PF
),
♦ Accuracy ±2ppm from 0°C to +40°C
♦ Accuracy ±3.5ppm from -40°C to +85°C
♦ Battery Backup Input for Continuous
♦ Operating Temperature Ranges
♦ Low-Power Consumption
♦ Real-Time Clock Counts Seconds, Minutes,
♦ 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
# 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.
DS3234S#
DS3234SN#
Timekeeping
Hours, Day, Date, Month, and Year with Leap Year
Compensation Valid Up to 2099
TOP VIEW
PART
Commercial: 0°C to +70°C
Industrial: -40°C to +85°C
INT/SQW
32kHz
-40°C to +85°C
N.C.
N.C.
N.C.
N.C.
N.C.
V
RST
TEMP RANGE
CS
CC
0°C to +70°C
10
1
2
3
4
5
6
7
8
9
Ordering Information
DS3234
SO
Pin Configuration
PIN-
PACKAGE
20 SO
20 SO
20
19
18
17
16
15
14
13
12
11
SCLK
DOUT
SCLK
DIN
V
GND
N.C.
N.C.
N.C.
N.C.
BAT
Features
DS3234SN
DS3234S
MARK
TOP
1

Related parts for DS3234S#

DS3234S# Summary of contents

Page 1

... Register for Aging Trim ♦ RST Input/Output ♦ 300-Mil, 20-Pin SO Package ♦ Underwriters Laboratories Recognized PART DS3234S# DS3234SN# # Denotes a RoHS-compliant device that may include lead that is exempt under the RoHS requirements. Lead finish is JESD97 Applications Category e3, and is compatible with both lead-based and lead-free soldering processes. A " ...

Page 2

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 (θ Junction-to-Case Thermal Resistance (θ JC Operating Temperature Range (noncondensing) .............................................-40°C to +85°C Note ...

Page 3

Extremely Accurate SPI Bus RTC with ELECTRICAL CHARACTERISTICS (continued 2.0V to 5.5V active supply (see Table 1 3.3V 3.0V, and T = +25°C, unless otherwise noted. TCXO operation guaranteed from 2.3V ...

Page 4

Extremely Accurate SPI Bus RTC with Integrated Crystal and SRAM AC ELECTRICAL CHARACTERISTICS (V = 2.0V to 5.5V -40°C to +85°C, unless otherwise noted.) (Note PARAMETER SYMBOL SCLK Clock Frequency Data to SCLK Setup SCLK ...

Page 5

Extremely Accurate SPI Bus RTC with RST PF(MAX) V PF(MIN) t VCCF RST WARNING: Negative undershoots below -0.3V while the part is in battery-backed mode may cause loss of data. Note 2: Limits at -40°C are guaranteed ...

Page 6

Extremely Accurate SPI Bus RTC with Integrated Crystal and SRAM CS t CCS t CC SCLK t t CDH t DC DIN W/R DOUT NOTE: SCLK CAN BE EITHER POLARITY, SHOWN FOR CPOL = SCLK t ...

Page 7

Extremely Accurate SPI Bus RTC with (V = +3.3V +25°C, unless otherwise noted STANDBY SUPPLY CURRENT vs. SUPPLY VOLTAGE 150 INPUTS = GND RST ACTIVE 125 100 2.3 2.8 3.3 3.8 4.3 ...

Page 8

Extremely Accurate SPI Bus RTC with Integrated Crystal and SRAM PIN NAME CS 1 Active-Low Chip Select Input. Used to select or deselect the device. 2, 7–14 N.C. No Connection. Not connected internally. Must be connected to ground. 32kHz Push-Pull ...

Page 9

Extremely Accurate SPI Bus RTC with X1 OSCILLATOR AND CAPACITOR ARRAY BAT POWER CONTROL GND CS SCLK SPI INTERFACE AND ADDRESS REGISTER SCLK DECODE DIN DOUT Detailed Description The DS3234 is a TCXO and RTC with ...

Page 10

Extremely Accurate SPI Bus RTC with Integrated Crystal and SRAM date, month, and year information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock ...

Page 11

Extremely Accurate SPI Bus RTC with When RST is active due to a power-fail condition (see Table 1), SPI operations are inhibited while the TCXO and RTC continue to operate. When RST is active due to a pushbutton event, it ...

Page 12

Extremely Accurate SPI Bus RTC with Integrated Crystal and SRAM Figure 1. Address Map for DS3234 Timekeeping Registers and SRAM ADDRESS MSB BIT 6 READ/WRITE BIT 7 00h 80h 0 01h 81h 0 02h 82h 0 12/24 03h 83h 0 ...

Page 13

Extremely Accurate SPI Bus RTC with The DS3234 contains two time-of-day/date alarms. Alarm 1 can be set by writing to registers 07h to 0Ah. Alarm 2 can be set by writing to registers 0Bh to 0Dh. The alarms can be ...

Page 14

Extremely Accurate SPI Bus RTC with Integrated Crystal and SRAM BIT 7 BIT 6 EOSC NAME: BBSQW POR POR is defined as the first application of power to the device, either V Special-Purpose Registers The DS3234 has ...

Page 15

Extremely Accurate SPI Bus RTC with BIT 7 BIT 6 NAME: OSF BB32kHz POR POR is defined as the first application of power to the device, either V Control/Status Register (0Fh/8Fh) Bit 7: Oscillator Stop Flag (OSF). ...

Page 16

Extremely Accurate SPI Bus RTC with Integrated Crystal and SRAM BIT 7 BIT 6 NAME: SIGN DATA POR BIT 7 BIT 6 NAME: SIGN DATA POR BIT 7 BIT 6 NAME: DATA DATA POR ...

Page 17

Extremely Accurate SPI Bus RTC with BIT 7 BIT 6 0 NAME POR*: 0 *POR is defined as the first application of power to the device, either V BIT 7 BIT 6 NAME BIT 7 BIT ...

Page 18

Extremely Accurate SPI Bus RTC with Integrated Crystal and SRAM Address and data bytes are shifted MSB first into the serial data input (DIN) and out of the serial data output (DOUT). Any transfer requires the address of the byte ...

Page 19

Extremely Accurate SPI Bus RTC with CS SCLK DIN WRITE ADDRESS BYTE DIN ADDRESS BYTE READ DOUT HIGH IMPEDANCE Figure 5. SPI Multiple-Byte Burst Transfer Data transfers can occur one byte at a time or in multi- ple-byte burst mode. ...

Page 20

Extremely Accurate SPI Bus RTC with Integrated Crystal and SRAM Chip Information SUBSTRATE CONNECTED TO GROUND PROCESS: CMOS 20 ____________________________________________________________________ Package Information For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or ...

Page 21

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 21 © 2010 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc ...

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