STMICROELECTRONICS M41T56C64MY6E

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 85°C
■
Packaging includes:
– 18-lead SOIC (with embedded crystal)
■
RoHS compliant
Embedded crystal
18
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
2
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2
Pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3
Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
4
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1
Serial RTC device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2
EEPROM device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5
Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6
DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
7
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
8
Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
9
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.
4/19
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
M41T56C64
1
Summary description
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 25°C 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
M41T56
+
M24C64
(EEPROM)
SDA
FT/OUT(1)
WC
VSS
AI09123
1. Open drain output
5/19
Pin settings
M41T56C64
2
Pin settings
2.1
Pin description
Table 1. Signal names
FT/OUT (1)
Frequency test / output driver (open drain)
SDA
Serial data address input / output
SCL
Serial clock
WC
Write control
E0, E1, E2
Chip enables
VBAT
Battery supply voltage
VCC
Supply voltage
VSS
Ground
NC (2)
No connect
NF (3)
No function
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.
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
4
15
+
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
Application
Figure 3.
Block diagram
1 Hz
OSCILLATOR
32.768 kHz
SECONDS
MINUTES
DIVIDER
CENTURY/HOURS
DAY
FT/OUT
DATE
MONTH
VOLTAGE
SENSE
and
SWITCH
CIRCUITRY
VCC
VSS
VBAT
YEAR
CONTROL
LOGIC
CONTROL
E0
E1
E2
56 x8
(SRAM)
SCL
SERIAL
BUS
INTERFACE
M24C64
8192 x8
(EEPROM)
ADDRESS
REGISTER
SDA
AI09125
Figure 4.
Crystal accuracy across temperature
Frequency (ppm)
20
0
–20
–40
–60
∆F = offset + K x (T – 25)2
F
–80
K = –0.034 ppm/°C2 ± 0.004 ppm/°C2
–100
offset = 6 ppm ± 6 ppm
–120
–140
–160
–40
–30
–20
–10
0
10
20
30
40
50
60
70
80
Temperature °C
AI09159
7/19
Application
M41T56C64
Table 2. Device select code
Device type identifier(1)
Chip enable address(2)
b7
b6
b5
b4
b3
b2
b1
b0
M24C64
1
0
1
0
E2
E1
E0
RW
M41T56
1
1
0
1
0
0
0
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
RW
M41T56C64
Operation
4
Operation
4.1
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
5
M41T56C64
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)
Parameter
Value
Unit
Ambient operating temperature
–40 to 85
°C
Storage temperature (VCC off, oscillator off)
–55 to 125
°C
240
°C
Lead solder temperature for 10 seconds
VIO
Input or output voltages
–0.3 to 6.5
V
VCC
Supply voltage
–0.3 to 6.5
V
IO
Output current
20
mA
PD
Power dissipation
0.25
W
1. For SOX18 package, Lead-free (Pb-free) lead finish: Reflow at peak temperature of 240°C (total thermal
budget not to exceed 180°C 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:
10/19
Negative undershoots below –0.3V are not allowed on any pin while in the battery back-up
mode.
M41T56C64
6
DC and AC parameters
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
Value
Unit
Supply voltage (VCC)
4.5 to 5.5
V
Ambient operating temperature (TA)
–40 to 85
°C
Load capacitance (CL)
100
pF
Input rise and fall times
50 (max)
ns
Input pulse voltages
0.2VCC to 0.8VCC
V
Input and output timing ref. voltages
0.3VCC to 0.7VCC
V
1. Output Hi-Z is defined as the point where data is no longer driven.
Figure 5.
AC measurement I/O waveform
0.8VCC
0.2VCC
0.7VCC
0.3VCC
AI02568
11/19
DC and AC parameters
M41T56C64
Table 5. Capacitance and input parameters
CIN
Test
condition
Parameter (1) (2)
Symbol
Min
Max
Unit
Input capacitance (SCL)
13
pF
Input capacitance (SDA)
18
pF
Input Capacitance (Other pins)
6
pF
20
kΩ
ZWCL
WC input impedance
VIN < 0.5V
5
ZWCH
WC input impedance
VIN < 0.7VCC
500
COUT(3)
kΩ
Output capacitance (SDA)
18
pF
Output capacitance (FT/OUT)
10
pF
Max
Unit
0V ≤VIN ≤VCC
±3
µA
0V ≤VOUT ≤VCC
±3
µA
Switch frequency =
100kHz
310
µA
Supply current
(Serial EEPROM active)
VCC = 5V, fc=400kHz
(rise/fall time < 30ns)
2.2
mA
Supply current (standby)
SCL, SDA = VCC – 0.3V
1. Effective capacitance measured with power supply at 5V; sampled, not 100% tested.
2. At 25°C, f = 400kHz..
3. Outputs deselected.
Table 6. DC characteristics
Symbol
Parameter
ILI
Input leakage current
ILO
Output leakage current
Supply current
(Serial RTC active)
ICC1
ICC2
VIL
Test Condition(1)
VOL
100
µA
–0.3
1.5
V
Input low voltage (E2, E1, E0)
–0.45
0.3VCC
V
Input low voltage (WC)
–0.45
0.5
V
3
VCC + 0.8
V
0.7VCC
VCC + 1
V
0.4
V
3
3.5
V
450
550
nA
Input high voltage
(E2, E1, E1, WC)
Output low voltage
IOL = 3mA, VCC = 5V
VBAT(2) Battery supply voltage
IBAT
Typ
Input low voltage (SCL, SDA)
Input high voltage (SCL, SDA)
VIH
Min
Battery supply current
2.5
TA = 25°C, VCC = 0V,
Oscillator ON, VBAT = 3V
1. Valid for ambient operating temperature: TA = –40 to 85°C; 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
DC and AC parameters
Figure 6.
AC Bus timing requirements sequence (serial RTC)
SDA
tBUF
tHD:STA
tR
tHD:STA
tF
SCL
tHIGH
P
S
tLOW
tSU:DAT
tHD:DAT
tSU:STA
tSU:STO
SR
P
AI00589
Table 7. AC characteristics, (serial RTC, M41T56)
Parameter (1)
Symbol
Min
Max
Unit
0
100
kHz
fSCL
SCL clock frequency
tLOW
Clock low period
4.7
µs
tHIGH
Clock high period
4
µs
tR
SDA and SCL rise time
1
µs
tF
SDA and SCL fall time
300
ns
tHD:STA
START condition hold time
(after this period the first clock pulse is generated)
tSU:STA
tSU:DAT
4
µs
START condition setup time
(only relevant for a repeated start condition)
4.7
µs
Data setup time
250
ns
0
µs
STOP condition setup time
4.7
µs
tBUF
Time the bus must be free before a new transmission
can start
4.7
µs
tLP
Low-pass filter input time constant (SDA and SCL) for
Serial RTC
0.25
tHD:DAT(2) Data hold time
tSU:STO
1
µs
1. Valid for ambient operating temperature: TA = –40 to 85°C; 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
M41T56C64
Table 8. AC characteristics (Serial EEPROM, M24C64)
Parameter
Test
condition
Symbol
Alt.
Min.
Max.
Unit
fC
fSCL
Clock frequency
400
kHz
tCHCL
tHIGH
Clock pulse width high
600
ns
tCLCH
tLOW
Clock pulse width low
1300
ns
tDL1DL2(1)
tF
tDXCX
SDA fall time
20
tSU:DAT
Data in set up time
100
ns
tCLDX
tHD:DAT
Data in hold time
0
ns
tCLQX
tDH
Data out hold time
200
ns
tCLQV(2)
tAA
Clock low to next data valid
(access time)
200
tCHDX(3)
tSU:STA
Start condition set up time
600
ns
tDLCL
tHD:STA
Start condition hold time
600
ns
tCHDH
tSU:STO Stop condition set up time
600
ns
1300
ns
tDHDL
tBUF
Time between stop condition and next
start condition
tW
tWR
Write time
tNS
Pulse width ignored (input filter on SCL
and SDA for serial EEPROM)
Single
glitch
300
900
ms
100
ns
2. To avoid spurious START and STOP conditions, a minimum delay is placed between SCL=1 and the
falling or rising edge of SDA.
14/19
ns
5
1. Sampled only, not 100% tested.
3. For a reSTART condition, or following a Write cycle.
ns
M41T56C64
7
Package mechanical data
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK®
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
h x 45°
1
C
E
10
H
18
A2
A
B
ddd
A1
e
A1
α
L
SO-J
1. Drawing is not to scale.
Table 9. SOX18 – 18-lead plastic small outline, 300mils, embedded crystal, package
mech.
millimetres
inches
Symbol
Typ
Min
Max
A
2.44
A1
Min
Max
2.69
0.096
0.106
0.15
0.31
0.096
0.012
A2
2.29
2.39
0.090
0.094
B
0.41
0.51
0.016
0.020
C
0.20
0.31
0.008
0.012
11.56
11.66
0.455
0.459
D
11.61
ddd
0.457
0.10
E
7.57
7.67
–
–
H
10.16
L
0.004
0.298
0.302
–
–
10.52
0.400
0.414
0.51
0.81
0.020
0.032
a
0°
8°
0°
8°
N
18
e
16/19
Typ
1.27
0.050
18
M41T56C64
8
Order codes
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 = –40°C to 85°C
Shipping method
E = ECOPACK® package, tubes
F = ECOPACK® 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
9
M41T56C64
Revision history
Table 11. Revision history
18/19
Date
Version
Description
14-Sep-2004
1
First Edition
25-Mar-2005
2
Clarify pin connections, maximum rating
4-Sep-2006
3
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
22-Sep-2006
4
Added information on EEPROM density Table 10: Ordering information
scheme
M41T56C64
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19/19