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Электронный компонент: M48T12-120

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1/19
March 2003
Rev. 3.0
M48T02
M48T12
5.0V, 16 Kbit (2Kb x 8) TIMEKEEPER
SRAM
FEATURES SUMMARY
s
INTEGRATED, ULTRA LOW POWER SRAM,
REAL TIME CLOCK, and POWER-FAIL
CONTROL CIRCUIT
s
BYTEWIDETM RAM-LIKE CLOCK ACCESS
s
BCD CODED YEAR, MONTH, DAY, DATE,
HOURS, MINUTES, and SECONDS
s
TYPICAL CLOCK ACCURACY OF 1 MINUTE
A MONTH, AT 25C
s
SOFTWARE CONTROLLED CLOCK
CALIBRATION FOR HIGH ACCURACY
APPLICATIONS
s
AUTOMATIC POWER-FAIL CHIP DESELECT
and WRITE PROTECTION
s
WRITE PROTECT VOLTAGES
(V
PFD
= Power-fail Deselect Voltage):
M48T02: V
CC
= 4.75 to 5.5V
4.5V
V
PFD
4.75V
M48T12: V
CC
= 4.5 to 5.5V
4.2V
V
PFD
4.5V
s
SELF-CONTAINED BATTERY and CRYSTAL
IN THE CAPHATTM DIP PACKAGE
s
PIN and FUNCTION COMPATIBLE WITH
JEDEC STANDARD 2K x 8 SRAMs
Figure 1. 24-pin PCDIP, CAPHATTM Package
24
1
PCDIP24 (PC)
Battery/Crystal
CAPHAT
M48T02, M48T12
2/19
TABLE OF CONTENTS
SUMMARY DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Figure 2. Logic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Table 1. Signal Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Figure 3. DIP Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Figure 4. Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
MAXIMUM RATING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Table 2. Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
DC AND AC PARAMETERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Table 3. Operating and AC Measurement Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 5. AC Testing Load Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Table 4. Capacitance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Table 5. DC Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
OPERATION MODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 6. Operating Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
READ Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 6. READ Mode AC Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 7. READ Mode AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
WRITE Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 7. WRITE Enable Controlled, WRITE AC Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 8. Chip Enable Controlled, WRITE AC Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 8. WRITE Mode AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Data Retention Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 9. Checking the BOK Flag Status. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 10. Power Down/Up Mode AC Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 9. Power Down/Up AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 10. Power Down/Up Trip Points DC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
CLOCK OPERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Reading the Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Setting the Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 11. Register Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Stopping and Starting the Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Calibrating the Clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 11. Crystal Accuracy Across Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 12. Clock Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
V
CC
Noise And Negative Going Transients. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 13. Supply Voltage Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
PACKAGE MECHANICAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
PART NUMBERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
REVISION HISTORY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3/19
M48T02, M48T12
SUMMARY DESCRIPTION
The M48T02/12 TIMEKEEPER
RAM is a 2Kb x 8
non-volatile static RAM and real time clock which
is pin and functional compatible with the DS1642.
A special 24-pin, 600mil DIP CAPHATTM package
houses the M48T02/12 silicon with a quartz crystal
and a long life lithium button cell to form a highly
integrated battery backed-up memory and real
time clock solution.
The M48T02/12 button cell has sufficient capacity
and storage life to maintain data and clock func-
tionality for an accumulated time period of at least
10 years in the absence of power over the operat-
ing temperature range.
The M48T02/12 is a non-volatile pin and function
equivalent to any JEDEC standard 2Kb x 8 SRAM.
It also easily fits into many ROM, EPROM, and
EEPROM sockets, providing the non-volatility of
PROMs without any requirement for special
WRITE timing or limitations on the number of
WRITEs that can be performed.
Figure 2. Logic Diagram
Table 1. Signal Names
Figure 3. DIP Connections
AI01027
11
A0-A10
W
DQ0-DQ7
VCC
M48T02
M48T12
G
VSS
8
E
A0-A10
Address Inputs
DQ0-DQ7
Data Inputs / Outputs
E
Chip Enable
G
Output Enable
W
WRITE Enable
V
CC
Supply Voltage
V
SS
Ground
A1
A0
DQ0
A7
A4
A3
A2
A6
A5
A10
A8
A9
DQ7
W
G
E
DQ5
DQ1
DQ2
DQ3
VSS
DQ4
DQ6
VCC
AI01028
M48T02
M48T12
8
1
2
3
4
5
6
7
9
10
11
12
16
15
24
23
22
21
20
19
18
17
14
13
M48T02, M48T12
4/19
Figure 4. Block Diagram
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 indicat-
ed in the Operating sections of this specification is
not implied. Exposure to Absolute Maximum Rat-
ing conditions for extended periods may affect de-
vice reliability. Refer also to the
STMicroelectronics SURE Program and other rel-
evant quality documents.
Table 2. Absolute Maximum Ratings
Note: 1. Soldering temperature not to exceed 260C for 10 seconds (total thermal budget not to exceed 150C for longer than 30 seconds).
CAUTION: Negative undershoots below 0.3V are not allowed on any pin while in the Battery Back-up mode.
AI01329
LITHIUM
CELL
OSCILLATOR AND
CLOCK CHAIN
VPFD
VCC
VSS
32,768 Hz
CRYSTAL
VOLTAGE SENSE
AND
SWITCHING
CIRCUITRY
8 x 8 BiPORT
SRAM ARRAY
2040 x 8
SRAM ARRAY
A0-A10
DQ0-DQ7
E
W
G
POWER
BOK
Symbol
Parameter
Value
Unit
T
A
Ambient Operating Temperature
0 to 70
C
T
STG
Storage Temperature (V
CC
Off, Oscillator Off)
40 to 85
C
T
SLD
(2)
Lead Solder Temperature for 10 seconds
260
C
V
IO
Input or Output Voltages
0.3 to 7
V
V
CC
Supply Voltage
0.3 to 7
V
I
O
Output Current
20
mA
P
D
Power Dissipation
1
W
5/19
M48T02, M48T12
DC AND AC PARAMETERS
This section summarizes the operating and mea-
surement 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 Measure-
ment Conditions listed in the relevant tables. De-
signers should check that the operating conditions
in their projects match the measurement condi-
tions when using the quoted parameters.
Table 3. Operating and AC Measurement Conditions
Note: Output Hi-Z is defined as the point where data is no longer driven.
Figure 5. AC Testing Load Circuit
Table 4. Capacitance
Note: 1. Effective capacitance measured with power supply at 5V. Sampled only, not 100% tested.
2. At 25C, f = 1MHz.
3. Outputs deselected.
Parameter
M48T02
M48T12
Unit
Supply Voltage (V
CC
)
4.75 to 5.5
4.5 to 5.5
V
Ambient Operating Temperature (T
A
)
0 to 70
0 to 70
C
Load Capacitance (C
L
)
100
100
pF
Input Rise and Fall Times
5
5
ns
Input Pulse Voltages
0 to 3
0 to 3
V
Input and Output Timing Ref. Voltages
1.5
1.5
V
AI01019
5V
OUT
CL = 100pF
CL includes JIG capacitance
1.8k
DEVICE
UNDER
TEST
1k
Symbol
Parameter
(1,2)
Min
Max
Unit
C
IN
Input Capacitance
10
pF
C
IO
(3)
Input / Output Capacitance
10
pF