Document
New Features Repetitive Alarms & Temperature Compensation
®
2-Wire™ RTC, 256K (32K x 8)
Intersil Real Time Clock/Calendar/CPU Supervisor with EEPROM
FEATURES
• Real Time Clock/Calendar — Tracks time in Hours, Minutes, Seconds and Hundredths of a Second — 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 • 32K x 8 Bits of EEPROM — 128-Byte Page Write Mode — 8 modes of Block Lock™ Protection — Single Byte Write Capability • High Reliability — Data Retention: 100 years — Endurance: 100,000 cycles per byte • 2-Wire™ Interface interoperable with I2C* — 400kHz data transfer rate • Frequency Output (SW Selectable: Off, 1Hz, 100Hz, or 32.768kHz) • Low Power CMOS — 1.25µA Operating Current (Typical) • Small Package Options — 8-Lead EIAJ SOIC and 14-Lead TSSOP
X1286
APPLICATIONS
• • • • • • • • • • • • • • • Utility Meters HVAC Equipment Audio / Video Components Set Top Box / Television Modems 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
BLOCK DIAGRAM
OSC Compensation
X1
32.768kHz
X2
Oscillator
Frequency Divider
1Hz
Timer Calendar Logic
Time Keeping Registers (SRAM)
Battery Switch Circuitry
VCC VBACK
PHZ/IRQ
Select Status Registers (SRAM) Mask
SCL SDA
Serial Interface Decoder
Control Decode Logic
Control/ Registers (EEPROM)
Alarm
Compare Alarm Regs (EEPROM) 256K EEPROM ARRAY
8
*I2C is a Trademark of Philips. REV 1.1 7/8/04
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X1286
PIN DESCRIPTIONS
8-pin EIAJ SOIC X1 X2 PHZ/IRQ VSS 1 2 3 4 8 7 6 5 VCC VBACK SCL SDA X1 X2 NC NC NC PHZ/IRQ VSS
14- pin TSSOP 1 2 3 4 5 6 7 14 13 12 11 10 9 8 VCC VBACK NC NC NC SCL SDA
ORDERING INFORMATION VCC Range
2.7–5.5V
Package
8L EIAJ SOIC 14L TSSOP
Operating Temperature Range
0–70°C -40–85°C 0–70°C -40–85°C
Part Number
X1286A8 X1286A8I X1286V14 X1286V14I
PART MARK INFORMATION 14-Lead TSSOP EYWW XXXXX 1286 = 2.7 to 5.5V, 0 to +70°C 1286I = 2.7 to 5.5V, -40 to +85°C 8-Lead EIAJ SOIC X1286 EYWWX Blank = 2.7 to 5.5V, 0 to +70°C I = 2.7 to 5.5V, -40 to +85°C
REV 1.1 7/8/04
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X1286
PIN ASSIGNMENTS Pin Number EIAJ SOIC
1
TSSOP
1
Symbol
X1
Brief Description
X1. The X1 pin is the input of an inverting amplifier. An external 32.768kHz quartz crystal is used with the X1286 to supply a timebase for the real time clock. The recommended crystal is a Citizen CFS206-32.768KDZF. Internal compensation circuitry is included to form a complete oscillator circuit. Care should be taken in t.