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REV 1.1.30 3/24/04
1 of 31
www.xicor.com
Preliminary Information
2-Wire
TM
RTC Real Time Clock/Calendar/CPU Supervisor with EEPROM
X1288
FEATURES
Real Time Clock/Calendar
-- Tracks time in Hours, Minutes, Seconds and Hun-
dredths 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 setting to 30ppm
CPU Supervisor Functions
-- Power On Reset, Low Voltage Sense
-- Watchdog Timer (SW Selectable: 0.25s, 0.75s,
1.75s, off)
Battery Switch or Super Cap Input
32K x 8 Bits of EEPROM
-- 128-Byte Page Write Mode
-- 8 modes of Block LockTM Protection
-- Single Byte Write Capability
High Reliability
--Data Retention: 100 years
--Endurance: 100,000 cycles per byte
2-WireTM Interface interoperable with I2C*
-- 400kHz data transfer rate
Frequency Output (SW Selectable: Off, 1Hz, 100Hz,
or 32.768kHz)
Low Power CMOS
-- 1.25A Operating Current (Typical)
Small Package Options
-- 16-Lead SOIC and 14-Lead TSSOP
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
X1
X2
Oscillator
Frequency
Timer
Logic
Divider
Calendar
8
Control/
Registers
1Hz
Time
Keeping
Registers
Alarm Regs
Compare
Mask
RESET
Control
Decode
Logic
Alarm
(EEPROM)
(EEPROM)
SCL
SDA
Serial
Interface
Decoder
256K
EEPROM
ARRAY
Watchdog
Timer
Low Voltage
Reset
Registers
Status
(SRAM)
Select
PHZ/IRQ
V
CC
V
BACK
32.768kHz
(SRAM)
Battery
Circuitry
Switch
OSC
Compensation
*I2C is a Trademark of Philips.
New Features
Repetitive Alarms &
Temperature Compensation
2 of 31
REV 1.1.30 3/24/04
www.xicor.com
Preliminary Information
X1288
PIN DESCRIPTIONS
ORDERING INFORMATION
V
CC
Range
V
TRIP
Range
Package
Operating
Temperature Range
Part Number
4.55.5V
4.63V112mV
16L SOIC
070C
X1288S16-4.5A
-4085C
X1288S16I-4.5A
14L TSSOP
070C
X1288V14-4.5A
-4085C
X1288V14I-4.5A
4.55.5V
4.38V112mV
16L SOIC
070C
X1288S16
-4085C
X1288S16I
14L TSSOP
070C
X1288V14
-4085C
X1288V14I
2.75.5V
2.85V100mV
16L SOIC
070C
X1288S16-2.7A
-4085C
X1288S16I-2.7A
14L TSSOP
070C
X1288V14-2.7A
-4085C
X1288V14I-2.7A
2.75.5V
2.65V100mV
16L SOIC
070C
X1288S16-2.7
-4085C
X1288S16I-2.7
14L TSSOP
070C
X1288V14-2.7
-4085C
X1288V14I-2.7
X1
X2
V
BACK
V
CC
NC
PHZ/IRQ
NC
V
SS
1
2
3
4
13
14
12
11
14-pin TSSOP
NC
NC
SCL
NC
RESET
SDA
5
6
7
9
10
8
16-pin SOIC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
X1
X2
NC
V
SS
NC
NC
RESET
NC
V
BACK
V
CC
PHZ/IRQ
NC
SCL
NC
SDA
NC
NC = No internal connection
3 of 31
REV 1.1.30 3/24/04
www.xicor.com
Preliminary Information
X1288
PART MARK INFORMATION
14-Lead TSSOP
YWW
XXXXX
1288F = 2.7 to 5.5V, 0 to +70C, V
TRIP
=2.65V100mV
1288G = 2.7 to 5.5V, -40 to +85C, V
TRIP
=2.65V100mV
1288 = 2.7 to 5.5V, 0 to +70C, V
TRIP
=4.38V112mV
1288I = 2.7 to 5.5V, -40 to +85C, V
TRIP
=4.38V112mV
1288AN = 2.7 to 5.5V, 0 to +70C, V
TRIP
=2.85V100mV
1288AP = 2.7 to 5.5V, -40 to +85C, V
TRIP
=2.85V100mV
1288AL = 2.7 to 5.5V, 0 to +70C, V
TRIP
=4.63V112mV
1288AM = 2.7 to 5.5V, -40 to +85C, V
TRIP
=4.63V112mV
16-Lead SOIC
YWW
XXXXX
1288F = 2.7 to 5.5V, 0 to +70C, V
TRIP
=2.65V100mV
1288G = 2.7 to 5.5V, -40 to +85C, V
TRIP
=2.65V100mV
1288 = 2.7 to 5.5V, 0 to +70C, V
TRIP
=4.38V112mV
1288I = 2.7 to 5.5V, -40 to +85C, V
TRIP
=4.38V112mV
1288AN = 2.7 to 5.5V, 0 to +70C, V
TRIP
=2.85V100mV
1288AP = 2.7 to 5.5V, -40 to +85C, V
TRIP
=2.85V100mV
1288AL = 2.7 to 5.5V, 0 to +70C, V
TRIP
=4.63V112mV
1288AM = 2.7 to 5.5V, -40 to +85C, V
TRIP
=4.63V112mV
4 of 31
REV 1.1.30 3/24/04
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Preliminary Information
X1288
PIN ASSIGNMENTS
Pin Number
Symbol
Brief Description
SOIC
TSSOP
1
1
X1
X1.
The X1 pin is the input of an inverting amplifier. An external 32.768kHz quartz
crystal is used with the X1288 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 the placement of the
crystal and the layout of the circuit. Plenty of ground plane around the device and short
traces to X1 are highly recommended. See Application section for more information.
2
2
X2
X2.
The X2 pin is the output of an inverting amplifier. An external 32.768kHz quartz
crystal is used with the X1288 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 the placement of the
crystal and the layout of the circuit. Plenty of ground plane around the device and short
traces to X2 are highly recommended. See Application section for more information.
7
6
RESET
RESET Output RESET.
This is a reset signal output. This signal notifies a host
processor that the watchdog time period has expired or that the voltage has dropped
below a fixed V
TRIP
threshold. It is an open drain active LOW output. Recommended
value for the pullup resistor is 5K Ohms. If unused, tie to ground.
8
7
V
SS
V
SS
.
9
8
SDA
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. The input buffer is always active (not gated).
An open drain output requires the use of a pull-up resistor. The output circuitry controls
the fall time of the output signal with the use of a slope controlled pull-down. The circuit
is designed for 400kHz 2-wire interface speed.
10
9
SCL
Serial Clock (SCL).
The SCL input is used to clock all data into and out of the device.
The input buffer on this pin is always active (not gated).
14
12
PHZ/IRQ
Programmable Frequency/Interrupt Output PHZ/IRQ.
This is either an output from
the internal oscillator or an interrupt signal output. It is a CMOS output.
When used as frequency output, this signal has a frequency of 32.768kHz, 100Hz, 1Hz
or inactive.
When used as interrupt output, this signal notifies a host processor that an alarm has
occurred and an action is required. It is an active LOW output.
The control bits for this function are FO1 and FO0 and are found in address 0011h of
the Clock Control Memory map. See "Programmable Frequency Output Bits--FO1,
FO0" on page 15..
15
13
V
BACK
V
BACK
.
This input provides a backup supply voltage to the device. V
BACK
supplies
power to the device in the event the V
CC
supply fails. This pin can be connected to a
battery, a Supercap or tied to ground if not used.
16
14
V
CC
V
CC
.
5 of 31
REV 1.1.30 3/24/04
www.xicor.com
Preliminary Information
X1288
ABSOLUTE MAXIMUM RATINGS
Temperature Under Bias ................... -65C to +135C
Storage Temperature......................... -65C to +150C
Voltage on V
CC
, V
BACK
and PHZ/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 V
CC
or V
BACK
(whichever is higher)
DC Output Current .............................................. 5 mA
Lead Temperature (Soldering, 10 sec) ...............300C
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 spec-
ification is not implied. Exposure to absolute maximum
rating conditions for extended periods may affect
device reliability.
DC OPERATING CHARACTERISTICS
(Temperature = -40C to +85C, unless otherwise stated.)
OPERATING CHARACTERISTICS
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
Notes
V
CC
Main Power Supply
2.7
5.5
V
V
BACK
Backup Power Supply
1.8
5.5
V
V
CB
Switch to Backup Supply
V
BACK
-0.2
V
BACK
-0.1
V
V
BC
Switch to Main Supply
V
BACK
V
BACK
+0.2
V
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
Notes
I
CC1
Read Active Supply
Current
V
CC
= 2.7V
400
A
1, 5, 7, 14
V
CC
= 5.0V
800
A
I
CC2
Program Supply Current
(nonvolatile)
V
CC
= 2.7V
2.5
mA
2, 5, 7, 14
V
CC
= 5.0V
3.0
mA
I
CC3
Main Timekeeping
Current
V
CC
= 2.7V
10
A
3, 7, 8, 14, 15
V
CC
= 5.0V
20
A
I
BACK
Timekeeping Current
(Low Voltage Sense and
Watchdog Timer dis-
abled
V
BACK
= 1.8V
1.25
A
3, 6, 9, 14, 15
"See Perfor-
mance Data"
V
BACK
= 3.3V
1.5
A
I
LI
Input Leakage Current
10
A
10
I
LO
Output Leakage Current
10
A
10
V
IL
Input LOW Voltage
-0.5
V
CC
x 0.2 or
V
BACK
x 0.2
V
13
V
IH
Input HIGH Voltage
V
CC
x 0.7 or
V
BACK
x 0.7
V
CC
+ 0.5 or
V
BACK
+ 0.5
V
13
V
HYS
Schmitt Trigger Input
Hysteresis
V
CC
related level
.05 x V
CC
or
.05 x V
BACK
V
13
V
OL1
Output LOW Voltage for
SDA and RESET
V
CC
= 2.7V
0.4
V
11
V
CC
= 5.5V
0.4
V
OL2
Output LOW Voltage for
PHZ/IRQ
V
CC
= 2.7V
V
CC
x 0.3
V
11
V
CC
= 5.5V
V
CC
x 0.3
V
OH2
Output HIGH Voltage for
PHZ/IRQ
V
CC
= 2.7V
V
CC
x 0.7
V
12
V
CC
= 5.5V
V
CC
x 0.7