High Accuracy Timekeeping Module PT7C4025TPericom’s highly accurate RTC module maintains precise time across a broad temperature range. This RTC module integrates crystal and temperature compensation circuit into one unit, which provides enhanced reliability and ruggedness as well as less susceptibility to aging, EMI, and vibration. It also provides low-current operation and high accuracy comparable to other crystal-based solutions.

RTC with Integrated Crystal PT7C4337CPericom’s high accuracy RTC with integrated crystal could help designers to reduce development and testing time, and simplify testing process. It meets low timekeeping voltage 1.2V with SOIC-16 standard package.

I2C Interface RTCPericom’s I2C interface RTCs are all the lowest cost timekeeping options due to their simple, small circuit and reduced pin count. They are offered in various package types including SOP, DIP, MSOP, TSSOP and the smallest package DFN.

3-Wire Interface RTCMany timekeeping applications require the use of either square wave or interrupt function. If only one pin is available, the designer must choose the function to invoke.

REA

L TI

ME

CLO

CK

S

Design with Pericom’s Real Time Clock Portfolio

Integrated CRYSTAL and temperature compensation circuit in one unit

High Accuracy Timekeeping Module

RTC with Integrated Crystal3-Wire Interface RTC

I C Interface RTC2

®

MicroprocessorSupervisory IC

Real Time Clock

Microprocessor

Supervisory IC

Real Time

Clock

Pericom’s highly accurate timekeeping RTC module PT7C4025T with I2C interface is designed based on standard tuning-fork crystal.

It maintains ±3.8ppm within 0 ºC to +50 ºC temperature range (Equivalent to 10 seconds of monthly deviation) and ±5.0ppm within

-40 ºC to +85 ºC temperature range (Equivalent to 13 seconds of monthly deviation).

Highly Accurate Timekeeping Module – PT7C4025T

RTC with Integrated Crystal – PT7C4337C

®

This device is designed for users who require high accuracy timekeeping function, memory option, interrupt option, and low-current modes.

The FR4 package integrates RTC IC and crystal together. This module has been tested to meet Pericom stringent quality requirements.

PT7C4337C Key Features

Advantages Î Cost Effective

Î Accurate Time keeping

Î Memory Option

Î Low Current Mode

Î Reliable in all enviromental temperatures

Applications Î Utility meters

Î Security

Î Solar Cell panels

-140.0

-120.0

-100.0

-80.0

-60.0

-40.0

-20.0

0.0

20.0

-40 -35 -30 -25 -20 -15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85

Freq

.(ppm

)

Temp.(c)

-

VDD=5V

Freq. Deviation vs Temp.(Pre Calibration)

-3.0

-2.0

-1.0

0.0

1.0

2.0

3.0

4.0

-40 -35 -30 -25 -20 -15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85

Freq

.(ppm

)

Temp.(c)

-

VDD=5V

Freq. Deviation vs Temp.(Post Calibration)

VDD

VDD

TESTSCLSDA/INTFOEFOUT

GND

D 1 Note

OPEN

+SchottkyBarrierDiode

4.7µF

0.1µF

PT7C4025T

1

2

3

4

16

15

14

13

5

6

7

8

12

11

10

9

SOIC -16

SCL

SQW/INTB

VCC

NC

NC

NC

NC

NC

SDA

GND

INTA

NC

NC

NC

NC

NC

Î Using internal 32.768kHz quartz crystal

Î Supports I2C-Bus’s high speed mode (400 kHz)

Î Includes time (Hour/Minute/Second) and calendar (Year/Month/Date/Day) counter functions (BCD code)

Î Programmable square wave output signal

Î Two Time-of-Day Alarms

Î Oscillator Stop Flag

Î Operating range: 1.8V to 5.5V

Î Timekeeping range: 1.2V to 1.8V

Î Lead free and Green SOIC-16 package

Applications Î Wireless Access, Switch, NVR

All trademarks are property of their respective owners

www.pericom.com

Advantages of RTC Module with Integrated Crystal vs Stand-alone RTC IC

Î Ensure RTC and crystal have good match and work (appropriate load capacitance and Series Resistance)

Î No crystal procurement problem

Advantages of using SOIC-16 Package

Î ROHS Package

Î Do not have crystal layout problems (for PCB)

Î Not like the through hole type crystal, that will have add- itional steps in production and additional test process

I2C Interface RTC’s

Î Integrated crystal package can cut off destructor for crystal destruction thereby providing an additional security barrier

Part No. Description Applications & Benefits Package Types

PT7C4337 Low cost Timekeeping RTC Cost effective RTC with low operating current. Application: Switch, NVR, Car tracker, IP Camera, Mobile POS

DIP-8, SOIC-8, MSOP-8, DFN-8

PT7C43390 Low-current consumption RTC Works under a wide operating voltage range (1.3V-5.5V) Application: IP Camera SOIC-8, TSSOP-8

PT7C433833 Low-current consumption RTC with NVRAM Supports battery backup feature to provide system flexibility. Application: Broadband Access SOIC-8, MSOP-8, DFN-8

PT7C4311 Low-current RTC with NVRAM and clock calibration capability

Supports battery backup feature to provide system flexibility with clock calibration capability Application: HD STB, car tracker, security

SOIC-8, DFN-8

Î Uses external 32.768kHz quartz crystal

3-Wire Interface RTC’s

Part No. Description Applications & Benefits Package Types

PT7C4302Low-Power RTC with Programmable Square-wave Output and 31 Bytes of NVRAM

Works under a wide voltage range with battery backup supply Application: Water heater

DIP-8, SOIC-8, DFN-8

PT7C43190 Low-Power 3-wire interface RTC with wide operating voltage range

Works under a wide operating voltage range. (1.3V - 5.5V) Application: Monitors SOIC-8, TSSOP-8

Î Uses external 32.768kHz quartz crystal

VCC VCC

VBAT

VCC

VCCVCC2X1X2GND

VCC1SCLK

I/ORST

PT7C4302MCU

PT7M7825

MCU

RESET RESET

MRRESET

GND

GND

GND

U1U2

U3

GND

VBAT

BT1C4

C5104C3

C2

2

2

3

4

1

7

6

5

8

12pF

12pF

C1 104104

C6104

GND

GNDGND

GND

GND

GND

G1327000732.768KHz

14

S1

SW-PB3

VCC

Typical Application Circuit - PT7C4302

®

®

The solutions you need to connect at high-speed.Get more info on Real time clocks and timing solutions at: www.pericom.com

Pericom Real-Time Clock Solutions

PT7C4302 PT7C4307 PT7C4337 PT7C4337C* PT7C433833 PT7C4311 PT7C4363 PT7C4372A PT7C4025T* PT7C43190 PT7C43390 PT7C4563

Crystal (HZ) 32.768K 32.768K 32.768KIntegrated 32.768K

32.768K 32.768K 32.768K32.768K 32.000K

Integrated 32.768K

32.768K 32.768K 32.768K

Enable/Disable √ √ √ √ √ √ / / / / / /

Failure Detect / / √ √ √ / √ √ / / / √

Display (Hour)

12/24 12/24 12/24 12/24 12/24 24 24 12/24 24 12/24 12/24 24

Square Wave Output (HZ)

/1, 4.096K,

8.192K, 32.768K

1, 4.096K, 8.192K, 32.768K

1, 4.096K, 8.192K, 32.768K

1, 4.096K, 8.192K, 32.768K

5121, 32,

1.024K, 32.768K

1, 2, 32.768K,

32K

1, 1.024K,

32.768K, 1, 2, 4, 8, 16, 32K

1, 2, 4, 8, 16, 32K

1, 32, 1.024K, 32.768K

High/Low Output

/ √ / / √ √ / / / / / /

Alarm Interrupt / / √ √ / / √ √ √ √ √ √

NV RAM 31x8 56x8 / / 56x8 56x8 / / / / / /

Clock Calibration

/ / / / / √ / √ / √ √ /

Battery Backup √ √ / / √ √ / / / / / /

Interface 3-Wire I2C I2C I2C I2C I2C I2C I2C I2C 3-Wire I2C I2C

Charger √ / / / / / / / / / / /

Battery Voltage Range

1.5V~5.5V 4.5V~5.5V 1.8V~5.5V 1.8V~5.5V 2.7V~5.5V 1.5V~5.5V 1.3V~5.5V 1.8V~6.0V 1.8V~5.5V 1.3V~5.5V 1.3V~5.5V 1.3V~5.5V

Package 1

2

3

4

8

7

6

5

I/O

RST

VCC2

X1

X2

GND

SCLK

VCC1

DIP8,SOIC8 DFN8*

1

2

3

4

8

7

6

5

VCC

SCL

SDA

X1

X2

VBAT

GND

SQW/OUT

DIP8,SOIC8 DFN8*

1

2

3

4

8

7

6

5

VCC

SCL

SDA

X1

X2

INTA

GND

SQW/INTB

DIP8, SOIC8 MSOP8 DFN8

1

2

3

4

16

15

14

13

5

6

7

8

12

11

10

9

SOIC -16

SCL

SQW/INTB

VCC

NC

NC

NC

NC

NC

SDA

GND

INTA

NC

NC

NC

NC

NC

SOIC16

1

2

3

4

8

7

6

5

VCC

SCL

SDA

X1

X2

VBAT

GND

SQW/OUT

SOIC8 MSOP8 DFN8*

1

2

3

4

8

7

6

5

VCC

SCL

SDA

X1

X2

VBAT

GND

FDOUT

SOIC8 DFN8*

1

2

3

4

8

7

6

5

VCC

SCL

SDA

X1

X2

INT

GND

SQW

DIP8, SOIC8

1

2

3

4

8

7

6

5

VCC

INTA

INTB

SCL

SDA

GND

OSCIN

OSCOUT

SOIC8, DFN8*, TSSOP8

FR4

1

2

3

4

8

7

6

5

VDD

SIO

SCK

CS

INT

XOUT

XIN

VSS

SOIC8, TSSOP8

1

2

3

4

8

7

6

5

VDD

SCL

INT2

INT1

XOUT

XIN

GND

SDA

SOIC8, TSSOP8

1

2

3

4

8

7

6

5

VCC

SCL

SDA

X1

X2

INT

GND

SQW

DIP8, SOIC8 MSOP8 DFN8* TSSOP8

REAL-TIME CLOCK SOLUTIONS

Oscil

lator

Time

Prog

ramm

able

Note: * Contact Pericom for Availability http://www.pericom.com/products/clocks/real-time-clock/

RTC Brochure V.1 11/19/2012

Pericom offers a diverse range of accurate, low cost RTC solutions for handheld & embedded applications

14

13

12

11

10

9

8

NC

SDA

T2(Vpp)

GND

/INT

NC

NC

1

2

3

4

5

6

7

T1(CE)

SCL

FOUT

NC

Test

VDD

FOE