Document
www.DataSheet4U.com
Rev 0; 7/07
I2C, 32-Bit, Binary Counter Clock with 64-Bit ID
General Description
The DS1372 is a 32-bit binary up counter and 24-bit down counter with a unique 64-bit ID. The counters, ID, configuration, and status registers are accessed using an I 2 C serial interface. The DS1372 includes a SQW/INT open-drain output that can output either a square wave at one of four predefined frequencies, or it can output an active-low signal when the 24-bit down counter reaches 0.
Features
♦ Compliant with Microsoft Windows Media® DRM 10 for Portable Devices ♦ 32-Bit Binary Counter ♦ Programmable Alarm ♦ 64-Bit Factory-Programmed ID ♦ Interrupt Output ♦ I2C Serial Interface ♦ Two Selectable I2C Addresses ♦ 2.4V to 5.5V Operating Voltage Range ♦ 1.3V to 5.5V Timekeeping Operating Range ♦ -40°C to +85°C Operating Temperature Range ♦ 8-Pin µSOP
DS1372
Applications
Portable Audio and Video Players
Pin Configuration
TOP VIEW
X1 X2 AD0 GND 1 2 3 4
Ordering Information
+
8 7 VCC SQW/INT SCL SDA
PART DS1372U+
TEMP RANGE -40°C to +85°C
PIN-PACKAGE 8 μSOP
DS1372
TOP MARK 1372
6 5
μSOP
+Denotes a lead-free package. This symbol also appears on the top mark.
Windows Media is a registered trademark of Microsoft Corp.
Typical Operating Circuit
VCC CRYSTAL VCC
VCC
RPU
RPU SCL
X1
X2 VCC SQW/INT
CPU SDA RPU = tR / CB
DS1372
GND
AD0
________________________________________________________________ Maxim Integrated Products
1
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.
I2C, 32-Bit, Binary Counter Clock with 64-Bit ID DS1372
ABSOLUTE MAXIMUM RATINGS
Voltage Range on Any Pin Relative to Ground…. .-0.3V to +6.0V Continuous Power Dissipation (TA = +70°C) (derate 4.5mW/°C above +70°C) ……………………. ....360mW Operating Temperature Range (noncondensing)……. .......................................-40°C to +85°C Storage Temperature Range…………………….-55°C to +125°C Soldering Temperature………….......See IPC/JEDEC J-STD-020 specification.
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 DC ELECTRICAL CHARACTERISTICS
(VCC = 2.4V to 5.5V, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER Supply Voltage Active Supply Current Standby Current (Oscillator Enabled) Data Retention (Oscillator Disabled) Input Logic 1 AD0, SCL, SDA Input Logic 0 AD0, SCL, SDA Input Leakage AD0, SCL, SDA, SQW/INT Output Logic 0 SYMBOL VCC ICCA ICCS IDDR VIH VIL ILI I OL CONDITIONS Operating voltage range (Notes 2 and 3) Timekeeping operating range (Notes 2 and 4) (Note 3) EOSC = 0 (Notes 4 and 5) EOSC = 1 (Note 4) (Note 2) (Note 2) SDA, SQW/INT high impedance VOL = 0.4V (VCC > 2.4V), SDA, SQW/INT VOL = 0.2VCC (1.3V < VCC < 2.4V), SQW/INT 0.7 x VCC -0.3 -1 SQW = 32kHz SQW = 0 MIN 2.4 1.3 35 600 400 25 TYP MAX 5.5 5.5 90 1300 800 100 VCC + 0.3 0.3 x VCC +1 3 0.250 V μA nA nA V V μA mA UNITS
ELECTRICAL CHARACTERISTICS
(VCC = 2.4V to 5.5V, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER SCL Clock Frequency (Note 6) Bus-Free Time Between a STOP and START Condition Hold Time (Repeated) START Condition (Note 7) Low Period of SCL Clock High Period of SCL Clock Setup Time for Repeated START Condition Data Hold Time (Notes 8 and 9) SYMBOL fSCL tBUF tHD:STA tLOW tHIGH tSU:STA tHD:DAT CONDITIONS Fast mode Standard mode Fast mode Standard mode Fast mode Standard mode Fast mode Standard mode Fast mode Standard mode Fast mode Standard mode Fast mode Standard mode MIN 100 0.04 1.3 4.7 0.6 4.0 1.3 4.7 0.6 4.0 0.6 4.7 0 0 TYP MAX 400 100.00 UNITS kHz μs μs μs μs μs 0.9 μs
2
_______________________________________________________________________________________
I2C, 32-Bit, Binary Counter Clock with 64-Bit ID
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 2.4V to 5.5V, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER Data Setup Time (Note 10) SYMBOL tSU:DAT CONDITIONS Fast mode Standard mode Fast mode tR Standard mode Fast mode tF Standard mode tSU:STO CB CI/O TSP tOSF T_TIMEOUT 25 10 30 100 35 Fast mode Standard mode MIN 100 250 20 + 0.1CB 20 + 0.1CB 20 + 0.1CB 20 + 0.1CB 0.6 4.0 400 300 ns 1000 300 ns 300 μs pF pF ns ms ms TYP MAX UNITS ns
DS1372
Rise Time of SDA and SCL Signals (Note 11)
Fall Time of SDA and SCL Signals (Note 11)
Setup Time for STOP Condition Capacitive Load for Each Bus Line (Note 11) I/O Capacitance SCL Spike Suppresion Oscillator Stop Flag (OSF) Delay (Note 12) Timeout Interval (Note 13)
CRYSTAL SPECIFICATIONS
PARAMETER Nominal Frequency Capacitive Load Equivalent Series Resistance SYMBOL fO CL ESR MIN TYP 32.768 12.5 50 MAX UNITS kHz.