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M48T512V-85PM1

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P23
Not recommended for new design
This is information on a product still in production but not recommended for new designs.
June 2011 Doc ID 5747 Rev 7 1/23
1
M48T512Y
M48T512V
5.0 or 3.3 V, 4 Mbit (512 Kbit x 8) TIMEKEEPER
®
SRAM
Features
■ Integrated ultra low power SRAM, real-time
clock, power-fail control circuit, battery, and
crystal
■ BCD coded year, month, day, date, hours,
minutes, and seconds
■ Automatic power-fail chip deselect and WRITE
protection
■ WRITE protect voltages:
(V
PFD
= power-fail deselect voltage)
–M48T512Y: V
CC
= 4.5 to 5.5 V;
4.2 V ≤ V
PFD
≤ 4.5 V
–M48T512V: V
CC
= 3.0 to 3.6 V;
2.7 V ≤ V
PFD
≤ 3.0 V
■ Conventional SRAM operation; unlimited
WRITE cycles
■ Software controlled clock calibration for high
accuracy applications
■ 10 years of data retention and clock operation
in the absence of power
■ Pin and function compatible with industry
standard 512 K x 8 SRAMS
■ Self-contained battery and crystal in DIP
package
■ RoHS compliant
– Lead-free second level interconnect
32
1
PMDIP32 module
www.st.com
Obsolete Product(s) - Obsolete Product(s)
Contents M48T512Y, M48T512V
2/23 Doc ID 5747 Rev 7
Contents
1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 READ mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 WRITE mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.3 Data retention mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3 Clock operations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.1 Reading the clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2 Setting the clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.3 Stopping and starting the oscillator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.4 Calibrating the clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.5 V
CC
noise and negative going transients . . . . . . . . . . . . . . . . . . . . . . . . . 14
4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5 DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6 Environmental information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
8 Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Obsolete Product(s) - Obsolete Product(s)
M48T512Y, M48T512V List of tables
Doc ID 5747 Rev 7 3/23
List of tables
Table 1. Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Table 2. Operating modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 3. READ mode AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 4. WRITE mode AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 5. Register map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 6. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Table 7. Operating and AC measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Table 8. Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Table 9. DC characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Table 10. Power down/up AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Table 11. Power down/up trip points DC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Table 12. PMDIP32 – 32-pin plastic module DIP, package mechanical data. . . . . . . . . . . . . . . . . . . 20
Table 13. Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Table 14. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Obsolete Product(s) - Obsolete Product(s)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P23

M48T512V-85PM1

Mfr. #:
Buy M48T512V-85PM1
Manufacturer:
STMicroelectronics
Description:
Real Time Clock 4 MBIT 512 Kbitx8 TIMEKEEPER
Lifecycle:
New from this manufacturer.
Delivery:
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