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M41T56C64
Serial Real Time Clock with 56 bytes of NVRAM + 64 Kbit (8192 bit x 8) EEPROM
Feature summary

5V 10% supply voltage I2C bus compatible Operating temperature of -40 to 85C Packaging includes: - 18-lead SOIC (with embedded crystal)
18
Embedded crystal
RoHS compliant
1
Serial RTC features
Counters for seconds, minutes, hours, day, date, month, years, and century Embedded crystal package Software clock calibration Automatic power-fail detect and switch circuitry 56 bytes of general purpose SRAM Ultra-low battery supply current of 450nA Automatic leap year compensation Special software programmable output Two-wire I2C serial interface supports 100kHz protocol
SOX18(MY) 18-pin (300mil) SOIC

Serial EEPROM features
8192 bytes of general purpose EEPROM (more than 1e6 erase/write cycles) Two-wire I2C serial interface supports 400kHz protocol Byte and page write (up to 32 bytes) More than 40 year data retention Self-timed programming cycle

September 2006
Rev 4
1/19
www.st.com 1
Contents
M41T56C64
Contents
1 Summary description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 2.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 4
Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1 4.2 Serial RTC device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 EEPROM device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5 6 7 8 9
Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2/19
M41T56C64
List of tables
List of tables
Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Table 10. Table 11. Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Device select code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Operating and AC measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Capacitance and input parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 DC characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 AC characteristics, (serial RTC, M41T56) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 AC characteristics (Serial EEPROM, M24C64) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 SOX18 - 18-lead plastic small outline, 300mils, embedded crystal, package mech. . . . . . 16 Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3/19
List of figures
M41T56C64
List of figures
Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 18-pin SOIC connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Crystal accuracy across temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 AC measurement I/O waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 AC Bus timing requirements sequence (serial RTC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 SOX18 - 18-lead plastic small outline, 300mils, embedded crystal . . . . . . . . . . . . . . . . . . 16
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M41T56C64
Summary description
1
Summary description
The M41T56C64 is a low power, Serial Real Time Clock with 56 bytes of NVRAM plus a 64Kb EEPROM (see Figure 3). A built-in 32,768Hz oscillator (crystal controlled) and the first 8 bytes of the RAM are used for the clock/calendar function and are configured in binary coded decimal (BCD) format. Addresses and data are transferred serially via a two-line, bidirectional bus. The built-in address register is incremented automatically after each WRITE or READ data byte. The M41T56C64 clock has a built-in power sense circuit which detects power failures and automatically switches to the battery supply during power failures. The energy needed to sustain the RAM and clock operations can be supplied from a small lithium coin cell. Typical data retention time for the Serial RTC is in excess of 10 years with a 50mAh, 3V lithium cell. The M41T56C64 is supplied in an 18-lead Plastic SOIC package.
1.1
Calibration
As the crystal is molded together with the silicon in this package, ST can program the appropriate calibration value necessary to achieve 5 ppm accuracy at 25C after two SMT reflows (see Figure 4). This calibration value will be written into address 1550h of the EEPROM. This clock accuracy can then be guaranteed to drift no more than 3 ppm the first year, and 1 ppm for each following year due to crystal aging. Figure 1. Logic diagram
VCC VBAT
SCL E0 E1 E2 WC M41T56 + M24C64 (EEPROM) SDA FT/OUT(1)
VSS
AI09123
1. Open drain output
5/19
Pin settings
M41T56C64
2
2.1
Pin settings
Pin description
Table 1. Signal names
FT/OUT (1) SDA SCL WC E0, E1, E2 VBAT VCC VSS NC (2) NF (3)
1. Open drain output 2. No connect (NC) pins should be tied to VSS. 3. No function (NF) pins should be tied to VSS. Pins 2 and 3, and pins 16 and 17 are internally shorted together.
Frequency test / output driver (open drain) Serial data address input / output Serial clock Write control Chip enables Battery supply voltage Supply voltage Ground No connect No function
2.2
Pin connections
Figure 2. 18-pin SOIC connection
NC(1) NF(2) NF(2) (1) NC E0 E1 E2 VBAT VSS
18 1 2 17 3 16 M41T56 15 4 + 5 14 M24C64 6 13 (EEPROM) 7 12 8 11 9 10
NC(1) NF(2) (2) NF VCC NC(1)
FT/OUT(3) WC SCL SDA
AI09124
1. No connect (NC) pins should be tied to VSS 2. No function (NF) pins should be tied to VSS. Pins 2 and 3, and pins 16 and 17 are internally shorted together. 3. Open drain output
6/19
M41T56C64
Application
3
Figure 3.
Application
Block diagram
1 Hz OSCILLATOR 32.768 kHz DIVIDER SECONDS MINUTES CENTURY/HOURS DAY FT/OUT VCC VSS VBAT E0 E1 E2 VOLTAGE SENSE and SWITCH CIRCUITRY DATE MONTH CONTROL LOGIC YEAR CONTROL
56 x8 (SRAM)
SCL
SERIAL BUS INTERFACE
SDA
ADDRESS REGISTER
M24C64 8192 x8 (EEPROM)
AI09125
Figure 4.
Crystal accuracy across temperature
Frequency (ppm) 20 0 -20 -40 -60 -80 -100 -120 -140 -160 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 F = offset + K x (T - 25)2 F K = -0.034 ppm/C2 0.004 ppm/C2 offset = 6 ppm 6 ppm
Temperature C
AI09159
7/19
Application Table 2. Device select code
Device type identifier(1) b7 M24C64 M41T56 1 1 b6 0 1 b5 1 0 b4 0 1 Chip enable address(2) b3 E2 0 b2 E1 0 b1 E0 0
M41T56C64
RW b0 RW RW
1. The most significant bit, b7, is sent first. 2. E0, E1, and E2 are compared against the respective external pins on the memory device.
8/19
M41T56C64
Operation
4
4.1
Operation
Serial RTC device
The M41T56C64 contains one Serial RTC (M41T56). For detailed information on how to use the devices, see the M41T56 datasheet, which is available from your local STMicroelectronics distributor or from the STMicroelectronics website, http://www.st.com/rtc/.
4.2
EEPROM device
The M41T56C64 contains a 64 Kbit Serial EEPROM (M24C64). For detailed information on how to use the devices, see the M24C64 datasheet, which is available from your local STMicroelectronics distributor or from the STMicroelectronics website, http://www.st.com/eeprom/.
9/19
Maximum rating
M41T56C64
5
Maximum rating
Stressing the device above the rating listed in the "absolute maximum ratings" table may cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions above those indicated in the Operating sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE program and other relevant quality documents. Table 3. Absolute maximum ratings
Symbol TA TSTG TSLD(1) VIO VCC IO PD Parameter Ambient operating temperature Storage temperature (VCC off, oscillator off) Lead solder temperature for 10 seconds Input or output voltages Supply voltage Output current Power dissipation Value -40 to 85 -55 to 125 240 -0.3 to 6.5 -0.3 to 6.5 20 0.25 Unit C C C V V mA W
1. For SOX18 package, Lead-free (Pb-free) lead finish: Reflow at peak temperature of 240C (total thermal budget not to exceed 180C for between 90 to 150 seconds). No direct exposure to infrared (IR) reflow, or IR preheat allowed, to avoid damaging the embedded 32KHz crystal.
Caution:
Negative undershoots below -0.3V are not allowed on any pin while in the battery back-up mode.
10/19
M41T56C64
DC and AC parameters
6
DC and AC parameters
This section summarizes the operating and measurement conditions, as well as the DC and AC characteristics of the device. The parameters in the following DC and AC characteristic tables are derived from tests performed under the measurement conditions listed in the relevant tables. Designers should check that the operating conditions in their projects match the measurement conditions when using the quoted parameters. Table 4. Operating and AC measurement conditions(1)
Parameter Supply voltage (VCC) Ambient operating temperature (TA) Load capacitance (CL) Input rise and fall times Input pulse voltages Input and output timing ref. voltages
1. Output Hi-Z is defined as the point where data is no longer driven.
Value 4.5 to 5.5 -40 to 85 100 50 (max) 0.2VCC to 0.8VCC 0.3VCC to 0.7VCC
Unit V C pF ns V V
Figure 5.
AC measurement I/O waveform
0.8VCC
0.7VCC 0.3VCC
AI02568
0.2VCC
11/19
DC and AC parameters Table 5. Capacitance and input parameters
Symbol CIN Parameter (1) (2) Input capacitance (SCL) Input capacitance (SDA) Input Capacitance (Other pins) ZWCL ZWCH COUT(3) WC input impedance WC input impedance Output capacitance (SDA) Output capacitance (FT/OUT)
1. Effective capacitance measured with power supply at 5V; sampled, not 100% tested. 2. At 25C, f = 400kHz.. 3. Outputs deselected.
M41T56C64
Test condition
Min
Max 13 18 6
Unit pF pF pF k k
VIN < 0.5V VIN < 0.7VCC
5 500
20
18 10
pF pF
Table 6. DC characteristics
Symbol ILI ILO Parameter Input leakage current Output leakage current Supply current (Serial RTC active) ICC1 Supply current (Serial EEPROM active) Supply current (standby) Input low voltage (SCL, SDA) VIL Input low voltage (E2, E1, E0) Input low voltage (WC) Input high voltage (SCL, SDA) VIH VOL Input high voltage (E2, E1, E1, WC) Output low voltage IOL = 3mA, VCC = 5V 2.5 TA = 25C, VCC = 0V, Oscillator ON, VBAT = 3V 3 450 Test Condition(1) 0V VIN VCC 0V VOUT VCC Switch frequency = 100kHz VCC = 5V, fc=400kHz (rise/fall time < 30ns) SCL, SDA = VCC - 0.3V -0.3 -0.45 -0.45 3 0.7VCC 100 1.5 0.3VCC 0.5 VCC + 0.8 VCC + 1 0.4 3.5 550 Min Typ Max 3 3 310 2.2 Unit A A A mA A V V V V V V V nA
ICC2
VBAT(2) Battery supply voltage IBAT Battery supply current
1. Valid for ambient operating temperature: TA = -40 to 85C; VCC = 4.5 to 5.5V (except where noted). 2. STMicroelectronics recommends the RAYOVAC BR1225 or BR1632 (or equivalent) as the battery supply.
12/19
M41T56C64 Figure 6.
DC and AC parameters AC Bus timing requirements sequence (serial RTC)
SDA tBUF tHD:STA tR SCL tHIGH P S tLOW tSU:DAT tHD:DAT tSU:STA SR P tSU:STO tF tHD:STA
AI00589
Table 7. AC characteristics, (serial RTC, M41T56)
Symbol fSCL tLOW tHIGH tR tF tHD:STA tSU:STA tSU:DAT Parameter (1) SCL clock frequency Clock low period Clock high period SDA and SCL rise time SDA and SCL fall time START condition hold time (after this period the first clock pulse is generated) START condition setup time (only relevant for a repeated start condition) Data setup time 4 4.7 250 0 4.7 4.7 0.25 1 Min 0 4.7 4 1 300 Max 100 Unit kHz s s s ns s s ns s s s s
tHD:DAT(2) Data hold time tSU:STO tBUF tLP STOP condition setup time Time the bus must be free before a new transmission can start Low-pass filter input time constant (SDA and SCL) for Serial RTC
1. Valid for ambient operating temperature: TA = -40 to 85C; VCC = 4.5 to 5.5V (except where noted). 2. Transmitter must internally provide a hold time to bridge the undefined region (300ns max.) of the falling edge of SCL.
13/19
DC and AC parameters Table 8. AC characteristics (Serial EEPROM, M24C64)
Symbol fC tCHCL tCLCH tDL1DL2(1) tDXCX tCLDX tCLQX tCLQV(2) tCHDX(3) tDLCL tCHDH tDHDL tW tNS Alt. fSCL tHIGH tLOW tF tSU:DAT tHD:DAT tDH tAA tSU:STA tHD:STA Parameter Clock frequency Clock pulse width high Clock pulse width low SDA fall time Data in set up time Data in hold time Data out hold time Clock low to next data valid (access time) Start condition set up time Start condition hold time 600 1300 20 100 0 200 200 600 600 600 1300 Test condition Min.
M41T56C64
Max. 400
Unit kHz ns ns
300
ns ns ns ns
900
ns ns ns ns ns
tSU:STO Stop condition set up time tBUF tWR Time between stop condition and next start condition Write time Pulse width ignored (input filter on SCL and SDA for serial EEPROM) Single glitch
5 100
ms ns
1. Sampled only, not 100% tested. 2. To avoid spurious START and STOP conditions, a minimum delay is placed between SCL=1 and the falling or rising edge of SDA. 3. For a reSTART condition, or following a Write cycle.
14/19
M41T56C64
Package mechanical data
7
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have a Lead-free second level interconnect . The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com
15/19
Package mechanical data Figure 7.
M41T56C64
SOX18 - 18-lead plastic small outline, 300mils, embedded crystal
D
9 1
h x 45
C E H
10
18
A2 B SO-J e A1
A ddd A1 L
1. Drawing is not to scale.
Table 9. SOX18 - 18-lead plastic small outline, 300mils, embedded crystal, package mech.
millimetres Symbol Typ A A1 A2 B C D ddd E e H L a N 1.27 7.57 - 10.16 0.51 0 18 11.61 Min 2.44 0.15 2.29 0.41 0.20 11.56 Max 2.69 0.31 2.39 0.51 0.31 11.66 0.10 7.67 - 10.52 0.81 8 0.050 0.298 - 0.400 0.020 0 18 0.457 Typ Min 0.096 0.096 0.090 0.016 0.008 0.455 Max 0.106 0.012 0.094 0.020 0.012 0.459 0.004 0.302 - 0.414 0.032 8 inches
16/19
M41T56C64
Order codes
8
Order codes
Table 10. Ordering information scheme
Example: M41T 56 C64 MY 6 E
Device type M41T = Serial RTC
Supply voltage and write protect voltage 56 = VCC = 4.5 to 5.5V
EEPROM density C64 = 64 Kbit (8192 bit x 8)
Package MY(1)= SOX18
Temperature range 6 = -40C to 85C
Shipping method E = ECOPACK(R) package, tubes F = ECOPACK(R) package, tape & reel
1. The SOX18 package includes an embedded 32,768Hz crystal.
For other options, or for more information on any aspect of this device, please contact the ST Sales Office nearest you.
17/19
Revision history
M41T56C64
9
Revision history
Table 11. Revision history
Date 14-Sep-2004 25-Mar-2005 4-Sep-2006 Version 1 2 3 First Edition Clarify pin connections, maximum rating Datasheet status updated to full datasheet; changed title on page 1; small text changes to Section 1: Summary description; reformatted figure in the Feature summary, reformatted Figure 1, Figure 2, Table 2 and Table 9; ecopack compliant; updated disclaimer Added information on EEPROM density Table 10: Ordering information scheme Description
22-Sep-2006
4
18/19
M41T56C64
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19/19

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