M41T315W [STMICROELECTRONICS]
Serial access phantom RTC supervisor; 串行访问幻影RTC主管
| 型号： | M41T315W |
| 厂家： | 
ST |
| 描述： | Serial access phantom RTC supervisor |
| 文件： | 总30页 (文件大小：242K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
M41T315Y
M41T315V, M41T315W
Serial access phantom RTC supervisor
Not For New Design
Features
■ 3.0V, 3.3V, or 5V operating voltage
■ Real-time clock keeps track of
tenths/hundredths of seconds, seconds,
minutes, hours, days, date of the month,
months, and years
16
■ Automatic leap year correction valid up to 2100
■ Automatic switch-over and deselect circuitry
■ Choice of power-fail deselect voltages:
1
SO16 (MQ)
(V
= power-fail deselect voltage)
PFD
(a)
– M41T315Y : V = 4.5 to 5.5V
CC
4.25V ≤ V
≤ 4.50V
PFD
– M41T315V: V = 3.0 to 3.6V
CC
2.80V ≤ V
≤ 2.97V
PFD
– M41T315W: V = 2.7 to 3.3V
SNAPHAT (SH)
battery & crystal
CC
2.60V ≤ V
≤ 2.70V
PFD
■ No address space required to communicate
with RTC
■ Provides nonvolatile supervisor functions for
battery backup of SRAM
■ Full 10% V operating range
CC
■ Industrial operating temperature range (–40 to
+85°C)
28
■ Ultra-low battery supply current of 500nA (max)
1
■ Optional packaging includes A 28-lead SOIC
®
and SNAPHAT top (to be ordered separately)
SOH28 (MH)
■ SNAPHAT package provides direct connection
for a snaphat top, which contains the battery
and crystal
■ RoHS compliant
– Lead-free second level interconnect
a. Contact local ST sales office for availability.
November 2007
Rev 3
1/30
This is information on a product still in production but not recommended for new designs.
www.st.com
1
Contents
M41T315Y, M41T315V, M41T315W
Contents
1
2
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.1
2.2
Non-volatile supervisor operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Data retention . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3
Clock operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.1
3.2
3.3
3.4
Clock register information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
AM-PM/12/24 mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Oscillator and reset bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Zero bits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4
5
6
7
8
Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
2/30
M41T315Y, M41T315V, M41T315W
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.
Table 12.
Table 13.
Table 14.
Table 15.
Table 16.
Table 17.
Table 18.
Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
AC electrical characteristics (M41T315Y). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
AC electrical characteristics (M41T315V/W) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
RTC register map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Ablolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
DC and AC measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
DC characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Crystal electrical characteristics (externally supplied) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Power down/up trip points DC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
SO16 - 16-lead plastic small outline (150 mils body width), package mechanical data . . . 23
SOH28 - 28-lead plastic small outline, package mechanical data . . . . . . . . . . . . . . . . . . . 24
SH - 4-pin SNAPHAT housing for 48mAh battery and crystal, package mechanical data . 25
SH - 4-pin SNAPHAT housing for 120mAh battery and crystal, package mechanical data 26
Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
SNAPHAT battery table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
3/30
List of figures
M41T315Y, M41T315V, M41T315W
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
16-pin SOIC connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
28-pin SOIC connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
M41T315Y/V/W to RAM/clock interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Read mode waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Write mode waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Comparison register definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Reset pulse waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 10. AC testing load circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 11. Power down/up mode AC waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 12. SO16 - 16-lead plastic small outline, package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Figure 13. SOH28 - 28-lead plastic small outline, package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 14. SH - 4-pin SNAPHAT housing for 48mAh battery and crystal, package mechanical data . 25
Figure 15. SH - 4-pin SNAPHAT housing for 120mAh battery and crystal, package outline. . . . . . . . 26
4/30
M41T315Y, M41T315V, M41T315W
Description
1
Description
®
The M41T315Y/V/W RTC Supervisor is a combination of a CMOS TIMEKEEPER and a
nonvolatile memory supervisor. Power is constantly monitored by the memory supervisor. In
the event of power instability or absence, an external battery maintains the timekeeping
operation and provides power for a CMOS static RAM by switching on and invoking write
protection to prevent data corruption in the memory and RTC.
The clock keeps track of tenths/hundredths of seconds, seconds, minutes, hours, day, date,
month, and year information. The last day of the month is automatically adjusted for months
with less than 31 days, including leap year correction.
The clock operates in one of two formats:
●
a 12-hour mode with an AM/PM indicator;
or
●
a 24-hour mode
The nonvolatile supervisor supplies all the necessary support circuitry to convert a CMOS
RAM to a nonvolatile memory. The M41T315Y/V/W can be interfaced with RAM without
leaving gaps in memory.
The M41T315Y/V/W is supplied in a 28-lead SOIC SNAPHAT® package (which integrates
both crystal and battery in a single SNAPHAT top) or a-16 pin SOIC. The 28-pin, 330mil
SOIC provides sockets with gold plated contacts at both ends for direct connection to a
separate SNAPHAT housing containing the battery and crystal. The unique design allows
the SNAPHAT battery/crystal package to be mounted on top of the SOIC package after the
completion of the surface mount process.
Insertion of the SNAPHAT housing after reflow prevents potential battery and crystal
damage due to the high temperatures required for device surface-mounting. The SNAPHAT
housing is also keyed to prevent reverse insertion.
The 28-pin SOIC and battery/crystal packages are shipped separately in plastic anti-static
tubes or in Tape & Reel form. For the 28-lead SOIC, the battery/crystal package (e.g.,
SNAPHAT) part number is “M4TXX-BR12SH” (see Table 17 on page 28).
Caution:
Do not place the SNAPHAT battery/crystal top in conductive foam, as this will drain the
lithium button-cell battery.
5/30
Description
M41T315Y, M41T315V, M41T315W
Figure 1.
Logic diagram
V
V
CCO
CCI
D
Q
XI(1)
(1)
CEO
XO
M41T315Y
M41T315V
M41T315W
WE
CEI
OE
RST
(1)
BAT
V
V
SS
AI03902
1. For 16-pin SOIC only
Table 1.
Signal names
XI-XO
D
32.768 KHz crystal connection
Data input
Q
Data output
RST
CEO
CEI
VBAT
OE
Reset input
Chip enable output
Chip enable input
Battery input
Output enable input
WRITE enable input
Switched supply voltage output
Supply voltage input
Ground
WE
VCCO
VCCI
VSS
NC
Not connected internally
Don’t Use
DU
6/30
M41T315Y, M41T315V, M41T315W
Figure 2. 16-pin SOIC connections
Description
XI
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
V
CCI
XO
CCO
WE
(1)
DU
M41T315Y
M41T315V
M41T315W
V
RST
OE
BAT
V
SS
D
CEI
CEO
NC
Q
V
SS
AI03909
Figure 3.
28-pin SOIC connections
WE
NC
NC
NC
NC
NC
NC
1
28
V
CCI
NC
2
27
26
25
24
23
22
21
20
19
18
17
16
15
3
NC
4
V
CCO
5
DU
NC
RST
NC
OE
NC
NC
CEI
6
M41T315Y
M41T315V
M41T315W
7
V
8
SS
NC
NC
D
9
10
11
12
13
14
Q
NC
CEO
NC
V
SS
AI03910
7/30
Description
Figure 4.
M41T315Y, M41T315V, M41T315W
Block diagram
XO
XI
32,768 Hz
CRYSTAL
CLOCK/CALENDAR LOGIC
CEO
UPDATE
READ
CEI
OE
WRITE
TIMEKEEPER REGISTER
CONTROL
LOGIC
WE
RST
POWER-FAIL
ACCESS
ENABLE
SEQUENCE
DETECTOR
COMPARISON REGISTER
D
Q
I/O
BUFFERS
DATA
INTERNAL V
V
CC
POWER-FAIL
DETECT
LOGIC
V
CCI
CCO
V
BAT
AI03636B
8/30
M41T315Y, M41T315V, M41T315W
Figure 5. M41T315Y/V/W to RAM/clock interface
Description
A0-An
DATA I/O
A0-An
D0-D7
CMOS
SRAM
WE
OE
WE
OE
CE
V
CC
CEO
OE
V
CCO
D
WE
V
CC
M41T315Y/V/W
CE
CEI
Q
RST
RST
V
CCI
V
BAT
X
X
1
0
+
BAT
V
SS
32.768 Hz
CRYSTAL
V
SS
AI04258
9/30
Operation
M41T315Y, M41T315V, M41T315W
2
Operation
Figure 6 on page 11 illustrates the main elements of the device. The following paragraphs
describe the signals and functions.
Communication with the clock is established by pattern recognition of a serial bit stream of
64 bits which must be matched by executing 64 consecutive WRITE cycles containing the
proper data on data in (D). All accesses which occur prior to recognition of the 64-bit pattern
are directed to memory via the chip enable output pin (CEO).
After recognition is established, the next 64 READ or WRITE Cycles either extract or update
data in the clock and CEO remains high during this time, disabling the connected memory
(see Table 2 on page 11).
Data transfer to and from the timekeeping function is accomplished with a serial bit stream
under control of chip enable input (CEI), output enable (OE), and WRITE enable (WE).
Initially, a READ cycle using the CEI and OE control of the clock starts the pattern
recognition sequence by moving the pointer to the first bit of the 64-bit comparison register.
Next, 64 consecutive WRITE cycles are executed using the CEI and WE control of the clock.
These 64 WRITE cycles are used only to gain access to the clock.
When the first WRITE cycle is executed, it is compared to the first bit of the 64-bit
comparison register. If a match is found, the pointer increments to the next location of the
comparison register and awaits the next WRITE cycle.
If a match is not found, the pointer does not advance and all subsequent WRITE cycles are
ignored. If a READ cycle occurs at any time during pattern recognition, the present
sequence is aborted and the comparison register pointer is reset. Pattern recognition
continues for a total of 64 WRITE cycles as described above until all the bits in the
comparison register have been matched (see Figure 8 on page 14).
With a correct match for 64 bits, access to the registers is enabled and data transfer to or
from the timekeeping registers may proceed. The next 64 cycles will cause the device to
either receive data on D, or transmit data on Q, depending on the level of OE pin or the WE
pin. Cycles to other locations outside the memory block can be interleaved with CEI cycles
without interrupting the pattern recognition sequence or data transfer sequence to the
device.
For a SO16 pin package, a standard 32.768 kHz quartz crystal can be directly connected to
the M41T315Y/V/W via pins 1 and 2 (XI, XO). The crystal selected for use should have a
specified load capacitance (C ) of 12.5 pF (see Table 10 on page 21).
L
10/30
M41T315Y, M41T315V, M41T315W
Operation
Table 2.
Mode
Operating modes
VCC
CEI
OE
WE
D
Q
Power
Deselect
WRITE
READ
VIH
VIL
VIL
VIL
X
X
X
X
VIL
VIH
VIH
X
Hi-Z
DIN
Hi-Z
Hi-Z
DOUT
Hi-Z
Hi-Z
Hi-Z
Standby
Active
4.5 to 5.5V
or
3.0 to 3.6V
or
VIL
VIH
X
Hi-Z
Hi-Z
Hi-Z
Hi-Z
Active
2.7 to 3.3V
READ
Active
Deselect
Deselect
VSO to VPFD (min)(1)
CMOS standby
Battery back-up mode
(1)
≤ VSO
X
X
X
1. See Table 11 on page 21 for details.
2.1
Non-volatile supervisor operation
A switch is provided to direct power from the battery input or V
to V
with a maximum
CCI
CCO
voltage drop of 0.3 Volts. The V
output pin is used to supply uninterrupted power to
CCO
CMOS SRAM. The M41T315Y/V/W safeguards the clock and RAM data by power-fail
detection and write protection.
Power-fail detection occurs when V
falls below V
which is set by an internal bandgap
CCI
PFD
reference. The M41T315Y/V/W constantly monitors the V
supply pin. When V
is less
CCI
CCI
than V
, power-fail circuitry forces the chip enable output (CEO) to V
or V -0.2 volts
PFD
CCI BAT
for external RAM write protection. During nominal supply conditions, CEO will track CEI with
a propagation delay. Internally, the M41T315Y/V/W aborts any data transfer in progress
without changing any of the device registers and prevents future access until V
exceeds
CCI
V
. Figure 5 on page 9 illustrates a typical RAM/clock interface.
PFD
Figure 6.
Read mode waveforms
WE
tRC
tCW
tOW
tRR
tCO
CEI
OE
tOD
tODO
tOE
tOEE
tCOE
DATA OUTPUT VALID
Q
AI04259
11/30
Operation
Figure 7.
M41T315Y, M41T315V, M41T315W
Write mode waveforms
OE
tWC
tWP
tWR
WE
CEI
tWR
tCW
t
DH
tDH
tDS
D
DATA INPUT STABLE
AI04261
Table 3.
AC electrical characteristics (M41T315Y)
Symbol
tRC
tCO
Parameter(1)
Min
Typ
Max
Units
tAVAV
tELQV
tGLQV
tELQX
tGLQX
tEHQZ
tGHQZ
READ cycle time
CEI access time
OE access time
65
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
55
55
tOE
tCOE
tOEE
tOD
CEI to output low Z
OE to output low Z
CEI to output high Z
5
5
25
25
tODO OE to output high Z
tRR
tCW
tOW
tWC
tWP
READ recovery
CEI pulse width
OE pulse width
WRITE cycle
10
55
55
65
55
tELEH
tGLGH
tAVAV
tWLWH
WRITE pulse width
tEHAX
tWHAX
tDVEH
tDVWH
tEHDX
tWHDX
(2)
tWR
WRITE recovery
Data setup
10
30
ns
ns
(3)
tDS
(3)
tDH
Data hold time
0
ns
ns
tRST
RST pulse width
65
1. Valid for ambient operating temperature: TA = –40 to 85°C; VCC = 4.5 to 5.5V (except where noted).
2. tWR is a function of the latter occurring edge of WE or CEI.
3. tDH and tDS are functions of the first occurring edge of WE or CEI in RAM mode.
12/30
M41T315Y, M41T315V, M41T315W
Operation
Units
Table 4.
Symbol
tRC
tCO
AC electrical characteristics (M41T315V/W)
Parameter(1)
Min
Typ
Max
tAVAV
tELQV
tGLQV
tELQX
tGLQX
tEHQZ
tGHQZ
READ cycle time
CEI access time
OE access time
85
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
85
85
tOE
tCOE
tOEE
tOD
CEI to output low Z
OE to output low Z
CEI to output high Z
5
5
30
30
tODO OE to output high Z
tRR
tCW
tOW
tWC
tWP
READ recovery
CEI pulse width
OE pulse width
WRITE cycle
20
65
60
85
60
tELEH
tGLGH
tAVAV
tWLWH
WRITE pulse width
tEHAX
tWHAX
tDVEH
tDVWH
tEHDX
tWHDX
(2)
tWR
WRITE recovery
Data setup
25
35
ns
ns
(3)
tDS
(3)
tDH
Data hold time
5
ns
ns
tRST
RST pulse width
85
1. Valid for ambient operating temperature: TA = –40 to 85°C; VCC = 4.5 to 5.5V (except where noted).
2. tWR is a function of the latter occurring edge of WE or CEI.
3. tDH and tDS are functions of the first occurring edge of WE or CEI in RAM mode.
13/30
Operation
Figure 8.
M41T315Y, M41T315V, M41T315W
Comparison register definition
Hex
Value
6
1
5
0
4
0
3
0
2
1
0
1
7
1
C5
BYTE 0
BYTE 1
0
1
1
0
1
0
1
0
1
1
0
0
1
0
1
0
1
0
0
1
3A
0
0
1
1
0
1
BYTE 2
BYTE 3
BYTE 4
BYTE 5
BYTE 6
A3
5C
C5
3A
A3
0
1
1
0
1
1
1
0
1
0
1
0
1
0
0
1
0
1
1
0
0
0
1
0
5C
0
0
BYTE 7
0
1
1
0
1
1
AI04262
Note:
Pattern recognition in “hex” is C5, 3A, A3, 5C, C5, 3A, A3, and 5C. The odds of this pattern
being accidentally duplicated and sending aberrant entries to the RTC is less than 1 in 10 .
19
This pattern is sent to the clock LSB to MSB.
2.2
Data retention
Most low power SRAMs on the market today can be used with the M41T315Y/V/W. There
are, however some criteria which should be used in making the final choice of an SRAM to
use. The SRAM must be designed in a way where the chip enable input disables all other
inputs to the SRAM. This allows inputs to the M41T315Y/V/W and SRAMs to be Don’t Care
once V
falls below V
(min). The SRAM should also guarantee data retention down to
CCI
PFD
V
= 2.0 volts. The chip enable access time must be sufficient to meet the system needs
CC
with the chip enable output propagation delays included. If the SRAM includes a second
chip enable pin (E2), this pin should be tied to V
.
OUT
If data retention lifetime is a critical parameter for the system, it is important to review the
data retention current specifications for the particular SRAMs being evaluated. Most SRAMs
specify a data retention current at 3.0 volts. Manufacturers generally specify a typical
condition for room temperature along with a worst case condition (generally at elevated
temperatures). The system level requirements will determine the choice of which value to
14/30
M41T315Y, M41T315V, M41T315W
Operation
use. The data retention current value of the SRAMs can then be added to the IBAT value of
the M41T315Y/V/W to determine the total current requirements for data retention. The
®
available battery capacity for the SNAPHAT of your choice can then be divided by this
current to determine the amount of data retention available (see Table 17 on page 28).
For a further more detailed review of lifetime calculations, please see Application Note
AN1012.
15/30
Clock operation
M41T315Y, M41T315V, M41T315W
3
Clock operation
3.1
Clock register information
Clock information is contained in eight registers of 8 bits, each of which is sequentially
accessed 1 bit at a time after the 64-bit pattern recognition sequence has been completed.
When updating the clock registers, each must be handled in groups of 8 bits. Writing and
reading individual bits within a register could produce erroneous results. These
READ/WRITE registers are defined in Table 5 on page 17.
Data contained in the clock registers is in binary coded decimal format (BCD). Reading and
writing the registers is always accomplished by stepping though all eight registers, starting
with Bit 0 of Register 0 and ending with Bit 7 of Register 7.
3.2
3.3
AM-PM/12/24 mode
Bit 7 of the hours register is defined as the 12-hour or 24-hour mode select bit. When high,
the 12-hour mode is selected. In the 12-hour mode, Bit 5 is the AM/PM bit with logic high
being PM. In the 24-hour mode, Bit 5 is the second 10-hour bit (20-23 hours).
Oscillator and reset bits
Bits 4 and 5 of the day register are used to control the reset and oscillator functions. Bit 4
controls the reset pin input. When the Reset Bit is set to logic '1,' the reset input pin is
ignored. When the Reset Bit is set to logic '0,' a low input on the reset pin will cause the
device to abort data transfer without changing data in the timekeeping registers. Reset
operates independently of all other inputs. Bit 5 controls the oscillator. When set to logic '0,'
the oscillator turns on and the real-time clock/calendar begins to increment.
3.4
Zero bits
Registers 1, 2, 3, 4, 5, and 6 contain one (1) or more bits that will always read logic '0.' When
writing to these locations, either a logic '1' or '0' is acceptable.
16/30
M41T315Y, M41T315V, M41T315W
Clock operation
Table 5.
Register
RTC register map
Function/range
BCD format
D7
D6
0.1 seconds
10 seconds
D5
D4
D3
D2
D1
D0
0
1
2
0.01 seconds
seconds
seconds
00-99
00-59
00-59
0
0
seconds
minutes
10 minutes
minutes
10/
A/P
01-12/
00-23
3
12/24
0
hrs
hours (24 hour format)
hours
4
5
6
7
0
0
0
0
0
0
OSC
0
RST
0
day of the week
date: day of the month
month
day
date
01-07
01-31
01-12
00-99
10 date
10M
month
year
10 years
year
Keys:
A/P = AM/PM bit
12/24 = 12 or 24-hour mode bit
OSC = Oscillator bit
RST = Reset bit
0 = Must be set to ‘0’
Figure 9.
Reset pulse waveform
tRST
RST
AI04260
17/30
Maximum rating
M41T315Y, M41T315V, M41T315W
4
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 6.
Symbol
Ablolute maximum ratings
Parameter
Value
Unit
TA
Operating temperature
–40 to +85
–40 to +85
–55 to +125
260
°C
°C
°C
°C
V
®
SNAPHAT
SOIC
TSTG
Storage temperature (VCC, oscillator off)
Lead solder temperature for 10 seconds
Supply voltage (on any pin relative to Ground)
(1)
TSLD
M41T315Y
–0.3 to +7.0
–0.3 to +4.6
–0.3 to VCC to +0.3
20
VCCI
M41T315V/W
V
VIO
IO
Input or output voltages
Output current
V
mA
W
PD
Power dissipation
1
1. For SO package, Lead-free (Pb-free) lead finish: Reflow at peak temperature of 260°C (total thermal budget not to exceed
245°C for greater than 30 seconds).
Caution:
Caution:
Negative undershoots below –0.3V are not allowed on any pin while in the Battery Back-up
mode.
Do NOT wave solder SOIC to avoid damaging SNAPHAT sockets.
18/30
M41T315Y, M41T315V, M41T315W
DC and AC parameters
5
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 7.
DC and AC measurement conditions
Parameter M41T315Y
M41T315V/W
VCC supply voltage
4.5 to 5.5V
–40 to +85°C
100pF
2.7 to 3.6V
–40 to +85°C
50pF
Ambient operating temperature
Load capacitance (CL)
Input rise and fall times
Input pulse voltages
≤ 5ns
≤ 5ns
0 to 3V
0 to 3V
Input and output timing ref. voltages
1.5V
1.5V
Figure 10. AC testing load circuit
400
DEVICE
UNDER
TEST
2.0V
AI04255
Max
C
L
C
includes JIG capacitance
L
Note:
50pF for M41T315V.
Table 8.
Symbol
CIN
Capacitance
Parameter(1)(2)
Min
Unit
Input capacitance
10
10
pF
pF
(3)
CIO
Input/output capacitance
1. Effective capacitance measured with power supply at 5V; sampled only; not 100% tested.
2. At 25°C, f = 1MHz.
3. Outputs were deselected.
19/30
DC and AC parameters
M41T315Y, M41T315V, M41T315W
M41T315V/W
Table 9.
Sym
DC characteristics
M41T315Y
–65
Parameter
Test condition(1)
–85
Typ
Unit
Min
Typ
Max
Min
Max
Input leakage
current
(2)
IIL
0V ≤ VIN ≤ VCC
1
1
µA
Output leakage
current
IOL
0V ≤ VOUT ≤ VCC
1
10
1
6
µA
mA
mA
(3)
ICC1
Supply current
VCC power supply
current
(4)
ICCO1
VCC0 = VCC1 – 0.3
150
100
Supply current
(TTL standby)
(3)
ICC2
CEI = VIH
3
2
mA
VCC power supply
current
(3)
ICC3
CEI = VCC1 – 0.2
1
1
mA
V
(5)
VIL
Input low voltage
Input high voltage
Output low voltage
–0.3
2.2
0.8
–0.3
2.0
0.6
VCC
0.3
+
(5)
VIH
VCC1 + 0.3
0.4
V
(6)
VOL
IOL = 4.0 mA
0.4
V
Output high
voltage
(6)
VOH
IOH = –1.0 mA
2.4
2.4
V
2.80 (V)
2.60 (W)
2.97 (V)
2.70 (W)
Power fail
deselect
VPFD
4.25
4.50
3.7
V
Battery back-up
switchover
VSO
VBAT
2.5
V
V
VBAT Battery voltage
2.5
2.5
3.7
VCC1 – 0.2
or
VCC1 – 0.2
or
CEO output
VCEO
V
voltage
VBAT – 0.2
VBAT – 0.2
VBAT = 3.0V
TA = 25°C
VCC = 0V
(3)
IBAT
Battery current
0.5
0.5
µA
µA
Battery backup
current
(7)
ICCO2
VCC0 = VBAT – 0.2V
100
100
1. Valid for ambient operating temperature: TA = –40 to 85°C; VCC = 4.5 to 5.5V or 2.7 to 3.6V (except where noted).
2. Applies to all input pins except RST, which is pulled internally to VCCI
.
3. Measured without RAM connected.
4. ICCO1 is the maximum average load current the device can supply to external memory.
5. Voltages are referenced to Ground.
6. Measured with load shown in Figure 10 on page 19.
7. ICCO2 is the maximum average load current that the device can supply to memory in the battery backup mode.
20/30
M41T315Y, M41T315V, M41T315W
DC and AC parameters
Table 10. Crystal electrical characteristics (externally supplied)
Symbol
Parameter(1)(2)
Min
Typ
Max
Unit
fO
RS
CL
Resonant frequency
Series resistance
Load capacitance
32.768
kHz
kΩ
pF
60
12.5
1. These values are externally supplied. STMicroelectronics recommends the KDS DT-38:
1TA/1TC252E127, Tuning Fork Type (thruhole) or the DMX-26S: 1TJS125FH2A212, (SMD) quartz crystal
for industrial temperature operations. KDS can be contacted at kouhou@ kdsj.co.jp or
http://www.kdsj.co.jp for further information on this crystal type.
2. Load capacitors are integrated within the M41T315Y/V/W. Circuit board layout considerations for the
32.768kHz crystal of minimum trace lengths and isolation from RF generating signals should be taken into
account.
Figure 11. Power down/up mode AC waveforms
V
CC
V
(max)
PFD
V
(min)
PFD
V
SO
tR
tFB
tF
tREC
tPF
DON’T CARE
CEI
V
0.2V
V
0.2V
tPD
tPD
BAT
BAT
CEO
AI04257
Table 11. Power down/up trip points DC characteristics
Symbol
Parameter(1)(2)
Min
Max
Unit
tREC
tF
tFB
tR
VPFD (max) to CEI low
1.5
300
10
0
2.5
ms
µs
µs
µs
µs
ns
ns
VPFD (max) to VPFD (min) VCC fall time
VPFD (min) to VSO VCC fall time
VPFD (min) to VPFD (max) VCC rise time
CEI high to power-fail
tPF
0
M41T315Y
M41T315V/W
10
15
(3)(4)
tPD
CEI propagation delay
1. Valid for ambient operating temperature: TA = –40 to 85°C; VCC = 4.5 to 5.5V or 2.7 to 3.6V (except
where noted).
2. Measured at 25°C.
3. Measured with load shown in Figure 10 on page 19.
4. Input pulse rise and fall times equal 10ns
21/30
Package mechanical data
M41T315Y, M41T315V, M41T315W
6
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.
22/30
M41T315Y, M41T315V, M41T315W
Package mechanical data
Figure 12. SO16 - 16-lead plastic small outline, package outline
A2
A
C
B
CP
e
D
N
1
E
H
A1
L
SO-b
Note:
Drawing is not to scale
Table 12. SO16 - 16-lead plastic small outline (150 mils body width), package
mechanical data
mm
Min
inches
Min
Sym
Typ
Max
Typ
Max
A
A1
A2
B
1.75
0.25
1.60
0.46
0.25
10.00
4.00
-
0.069
0.010
0.063
0.018
0.010
0.394
0.158
-
0.10
0.004
0.35
0.19
9.80
3.30
-
0.014
0.007
0.386
0.150
-
C
D
E
e
1.27
0.050
H
5.80
0.40
0°
6.20
1.27
8°
0.228
0.016
0°
0.244
0.050
8°
L
a
N
16
16
CP
0.10
0.004
23/30
Package mechanical data
M41T315Y, M41T315V, M41T315W
Figure 13. SOH28 - 28-lead plastic small outline, package outline
A2
A
C
eB
B
e
CP
D
N
E
H
A1
L
1
SOH-A
Note:
Drawing is not to scale.
Table 13. SOH28 - 28-lead plastic small outline, package mechanical data
mm
Min
inches
Min
Sym
Typ
Max
Typ
Max
A
A1
A2
B
3.05
0.36
2.69
0.51
0.32
18.49
8.89
-
0.120
0.014
0.106
0.020
0.12
0.05
2.34
0.36
0.15
17.71
8.23
-
0.002
0.092
0.014
0.006
0.697
0.324
-
C
D
0.728
0.350
-
E
e
1.27
0.050
eB
H
3.20
11.51
0.41
0°
3.61
12.70
1.27
8°
0.126
0.453
0.016
0°
0.142
0.500
0.050
8°
L
a
N
28
28
CP
0.10
0.004
24/30
M41T315Y, M41T315V, M41T315W
Package mechanical data
Figure 14. SH - 4-pin SNAPHAT housing for 48mAh battery and crystal, package
mechanical data
A2
A1
A
A3
L
eA
D
B
eB
E
SHTK-A
Table 14. SH - 4-pin SNAPHAT housing for 48mAh battery and crystal, package
mechanical data
mm
Min
inches
Min
Sym
Typ
Max
Typ
Max
A
A1
A2
A3
B
9.78
7.24
0
0.385
0.285
0.275
0.015
0.022
0.860
0.590
0.628
0.142
0.090
6.73
6.48
0.265
0.255
0
6.99
0.38
0.46
21.21
14.22
15.55
3.20
0.56
21.84
14.99
15.95
3.61
0.018
0.835
0.560
0.612
0.126
0.080
D
E
eA
eB
L
2.03
2.29
25/30
Package mechanical data
M41T315Y, M41T315V, M41T315W
Figure 15. SH - 4-pin SNAPHAT housing for 120mAh battery and crystal, package
outline
A2
A1
A
A3
L
eA
D
B
eB
E
SHTK-A
Table 15. SH - 4-pin SNAPHAT housing for 120mAh battery and crystal, package
mechanical data
mm
Min
inches
Min
Sym
Typ
Max
Typ
Max
A
A1
A2
A3
B
10.54
8.51
0
0.415
0.335
0.315
0.015
0.022
0.860
0.710
0.628
0.142
0.090
8.00
7.24
0.315
0.285
0
8.00
0.38
0.46
21.21
17.27
15.55
3.20
0.56
0.018
0.835
0.680
0.612
0.126
0.080
D
21.84
18.03
15.95
3.61
E
eA
eB
L
2.03
2.29
26/30
M41T315Y, M41T315V, M41T315W
Part numbering
7
Part numbering
Table 16. Ordering information scheme
Example:
M41T
315Y
–65
MH
6
E
Device type
M41T
Supply voltage and write protect voltage
315Y(1) = VCC = 4.5 to 5.5V; VPFD = 4.25 to 4.50V
315V = VCC = 3.0 to 3.6V; VPFD = 2.80 to 2.97V
315W = VCC = 2.7 to 3.3V; VPFD = 2.60 to 2.70V
Speed
–65 = 65ns (315Y)
–85 = 85ns (315V/W)
Package
MH(2) = SOH28
MQ = SO16
Temperature range
6 = –40 to 85°C
Shipping method
For SOH28:
blank = Tubes (not for new design - use E)
E = Lead-free package (ECOPACK®), tubes
F = Lead-free package (ECOPACK®), tape & reel
TR = Tape & reel (not for new design - use F)
For SOH16:
blank = Tubes (not for new design - use E)
E = Lead-free package (ECOPACK®), tubes
F = Lead-free package (ECOPACK®), tape & reel
TR = Tape & reel (not for new design - use F)
1. Contact local sales office
2. The SOIC package (SOH28) requires the SNAPHAT® battery package which is ordered separately under the part number
“M4Txx-BR12SHX” in plastic tube or “M4TXX-BR12SHXTR” in tape & reel form (see Table 17 on page 28).
27/30
Part numbering
M41T315Y, M41T315V, M41T315W
Caution:
Do not place the SNAPHAT battery package “M4TXX-BR12SH” in conductive foam as it will
drain the lithium button-cell battery.
For other options, or for more information on any aspect of this device, please contact the
ST sales office nearest you.
Table 17. SNAPHAT battery table
Part number
Description
Package
M48T28-BR12SH
M48T32-BR12SH
Lithium battery (48mAh) SNAPHAT
Lithium battery (120mAh) SNAPHAT
SH
SH
28/30
M41T315Y, M41T315V, M41T315W
Revision history
8
Revision history
Table 18. Document revision history
Date
Revision
Changes
Jun-2001
1.0
1.1
1.2
1.3
1.4
First issue
17-Jul-2001
18-Sep-2001
27-Sep-2001
01-May-2002
Basic formatting changes
Changed pin 8 in 28-pin to VSS
Added ambient temp to DC characteristics table (Table 9)
Modify reflow time and temperature footnote (Table 6)
Modify crystal electrical characteristics table footnotes (Table 10);
add marketing status (Table 16)
04-Nov-2002
1.5
26-Mar-2003
08-Jun-2004
1.6
2.0
Update test condition (Table 9)
Reformatted; add lead-free information
Reformatted document; product status Not for New Design; added
lead-free second level interconnect information to cover page and
Section 6: Package mechanical data; updated Table 6.
26-Nov-2007
3
29/30
M41T315Y, M41T315V, M41T315W
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30/30
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