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Details, datasheet, quote on part number:X1205S8
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Datasheet text preview:
New Features Repetitive Alarms & Temperature Compensation
2-WireTM RTC Real Time Clock/Calendar
FEATURES · Real Time Clock/Calendar -- Tracks time in Hours, Minutes, and Seconds --Day of the Week, Day, Month, and Year · 2 Polled Alarms (Non-volatile) -- Settable on the Second, Minute, Hour, Day of the Week, Day, or Month -- Repeat Mode (periodic interrupts) · Oscillator Compensation on chip -- Internal feedback resistor and compensation capacitors -- 64 position Digitally Controlled Trim Capacitor -- 6 digital frequency adjustment settings to ±30ppm · Battery Switch or Super Cap Input · 2-WireTM Interface interoperable with I2C* -- 400kHz data transfer rate · Low Power CMOS -- 1.25µA Operating Current (Typical) · Small Package Options -- 8-Lead SOIC and 8-Lead TSSOP APPLICATIONS · · · · · Utility Meters HVAC Equipment Audio / Video Components Set Top Box / Television Modems · · · · · · · · · ·
X1205
Network Routers, Hubs, Switches, Bridges Cellular Infrastructure Equipment Fixed Broadband Wireless Equipment Pagers / PDA POS Equipment Test Meters / Fixtures Office Automation (Copiers, Fax) Home Appliances Computer Products Other Industrial / Medical / Automotive
DESCRIPTION The X1205 device is a Real Time Clock with clock/ calendar, two polled alarms, oscillator compensation, and battery backup switch. The oscillator uses an external, low-cost 32.768kHz crystal. All compensation and trim components are integrated on the chip. This eliminates several external discrete components and a trim capacitor, saving board area and component cost. The Real-Time Clock keeps track of time with separate registers for Hours, Minutes, and Seconds. The Calendar has separate registers for Date, Month, Year and Day-of-week. The calendar is correct through 2099, with automatic leap year correction.
BLOCK DIAGRAM
OSC Compensation 32.768kHz X1 Oscillator X2 Frequency Divider 1Hz Timer Calendar Logic
Time Keeping Registers (SRAM)
Mask 8 Interrupt Enable Alarm
SCL SDA
Serial Interface Decoder
Control Decode Logic
Control Registers (EEPROM)
Status Registers (SRAM)
Alarm
Compare Alarm Regs (EEPROM)
IRQ
*I2C is a Trademark of Philips. REV 1.0.13 10/16/03
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X1205
PIN DESCRIPTIONS X1205
8-Pin SOIC X1 X2 IRQ VSS 1 2 3 4 8 7 6 5 VCC VBACK SCL SDA
8-Pin TSSOP VBACK VCC X1 X2 1 2 3 4 8 7 6 5 SCL SDA VSS IRQ
NC = No internal connection
ORDERING INFORMATION VCC Range
2.7-5.5V
Package
8L SOIC 8L TSSOP
Operating Temperature Range
070°C -4085°C 070°C -4085°C
Part Number
X1205S8 X1205S8I X1205V8 X1205V8I
PART MARK INFORMATION 8-Lead TSSOP YWW XXXXX 8-Lead SOIC X1205 X YWW XX Blank = 8-Lead SOIC
1205 = 2.7 to 5.5V, 0 to +70°C 1205I = 2.7 to 5.5V, -40 to 85°C PIN ASSIGNMENTS Pin Number SOIC
1 2 3
Blank = 2.7 to 5.5V, 0 to +70°C I = 2.7 to 5.5V, -40 to 85°C
TSSOP Symbol
3 4 5 X1 X2 IRQ
Brief Description
X1. The X1 pin is the input of an inverting amplifier and should be connected to one pin of a 32.768kHz quartz crystal. X2. The X2 pin is the output of an inverting amplifier and should be connected to one pin of a 32.768kHz quartz crystal. Interrupt Output IRQ. This is an interrupt signal output. This signal notifies a host processor that an alarm has occurred and requests action. It is an open drain active low output. VSS. Serial Data (SDA). SDA is a bidirectional pin used to transfer data into and out of the device. It has an open drain output and may be wire ORed with other open drain or open collector outputs. Serial Clock (SCL). The SCL input is used to clock all data into and out of the device. VBACK. This input provides a backup supply voltage to the device. VBACK supplies power to the device in the event the VCC supply fails. This pin can be connected to a battery, a Supercap or tied to ground if not used. VCC.
4 5
6 7
VSS SDA
6 7
8 1
SCL VBACK
8
2
VCC
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X1205
ABSOLUTE MAXIMUM RATINGS Temperature Under Bias .......... -65°C to +135°C Storage Temperature....... -65°C to +150°C Voltage on VCC, VBACK and IRQ pin (respect to ground) .... -0.5V to 7.0V Voltage on SCL, SDA, X1 and X2 pin (respect to ground) ...... -0.5V to 7.0V or 0.5V above VCC or VBACK (whichever is higher) DC Output Current .... 5 mA Lead Temperature (Soldering, 10 sec) ......300°C Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and the functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
DC OPERATING CHARACTERISTICS (Temperature = -40°C to +85°C, unless otherwise stated.) Symbol
VCC VBACK VCB VBC
Parameter
Main Power Supply Backup Power Supply Switch to Backup Supply Switch to Main Supply
Conditions
Min
2.7 1.8 VBACK -0.2 VBACK
Typ
Max
5.5 5.5 VBACK -0.1 VBACK +0.2
Unit
V V V V
Notes
OPERATING CHARACTERISTICS Symbol
ICC1 ICC2 ICC3 IBACK
Parameter
Read Active Supply Current Program Supply Current (nonvolatile) Main Timekeeping Current Timekeeping Current
Conditions
VCC = 2.7V VCC = 5.0V VCC = 2.7V VCC = 5.0V VCC = 2.7V VCC = 5.0V VBACK = 1.8V VBACK = 3.3V
Min
Typ
Max
400 800 2.5 3.0 10 20
Unit
µA µA mA mA µA µA µA µA
Notes
1, 5, 7, 14 2, 5, 7, 14 3, 7, 8, 14, 15 3, 6, 9, 14, 15
"See Performance Data"
1.25 1.5 10 10 -0.5 VCC x 0.7 or VBACK x 0.7 VCC x 0.2 or VBACK x 0.2 VCC + 0.5 or VBACK + 0.5
ILI ILO VIL VIH VHYS VOL
Input Leakage Current Output Leakage Current Input LOW Voltage Input HIGH Voltage Schmitt Trigger Input Hysteresis Output LOW Voltage for SDA/IRQ VCC related level VCC = 2.7V VCC = 5.5V
µA µA V V V
10 10 13 13 13 11
.05 x VCC or .05 x VBACK 0.4 0.4
V
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