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PDF M48T08Y Data sheet ( Hoja de datos )

Número de pieza M48T08Y
Descripción 64 Kbit 8Kb x 8 TIMEKEEPER SRAM
Fabricantes STMicroelectronics 
Logotipo STMicroelectronics Logotipo



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No Preview Available ! M48T08Y Hoja de datos, Descripción, Manual

M48T08
M48T08Y, M48T18
5 V, 64 Kbit (8 Kb x 8) TIMEKEEPER® SRAM
Features
Integrated ultra low power SRAM, real-time
clock, power-fail control circuit, and battery
BYTEWIDERAM-like clock access
BCD coded year, month, day, date, hours,
minutes, and seconds
Typical clock accuracy of ±1 minute a month, at
25 °C
Automatic power-fail chip deselect and WRITE
protection
WRITE protect
VPFD = power-fail deselect voltage):
– M48T08: VCC = 4.75 to 5.5 V;
4.5 V VPFD 4.75 V
– M48T18/T08Y: VCC = 4.5 to 5.5 V;
4.2 V VPFD 4.5 V
Software controlled clock calibration for high
accuracy applications
Self-contained battery and crystal in the
CAPHATDIP package
Packaging includes a 28-lead SOIC and
SNAPHAT® top (to be ordered separately)
SOIC package provides direct connection for a
snaphat top which contains the battery and
crystal
Pin and function compatible with DS1643 and
JEDEC standard 8 K x 8 SRAMs
RoHS compliant
– Lead-free second level interconnect
28
1
PCDIP28
battery/crystal
CAPHAT™
SNAPHAT®
battery/crystal
28
1
SOH28
June 2011
Doc ID 2411 Rev 11
1/31
www.st.com
1

1 page




M48T08Y pdf
M48T08, M48T08Y, M48T18
1 Description
Description
The M48T08/18/08Y TIMEKEEPER® RAM is an 8 K x 8 non-volatile static RAM and real-
time clock which is pin and function compatible with the DS1643. The monolithic chip is
available in two special packages to provide a highly integrated battery-backed memory and
real-time clock solution.
The M48T08/18/08Y is a non-volatile pin and function equivalent to any JEDEC standard
8 K 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.
The 28-pin, 600 mil DIP CAPHAT™ houses the M48T08/18/08Y silicon with a quartz crystal
and a long-life lithium button cell in a single package.
The 28-pin, 330 mil 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 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 keyed to prevent reverse insertion.
The 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 “M4T28-BR12SH” or “M4T32-BR12SH”.
Figure 1. Logic diagram
VCC
13
A0-A12
8
DQ0-DQ7
W
M48T08
E1
M48T08Y
M48T18
INT
E2
G
VSS
AI01020
Doc ID 2411 Rev 11
5/31

5 Page





M48T08Y arduino
M48T08, M48T08Y, M48T18
Operation modes
Figure 6. WRITE enable controlled, WRITE AC waveform
A0-A12
E1
E2
W
DQ0-DQ7
tAVE1L
tAVAV
VALID
tAVWH
tAVE2H
tAVWL
tWLWH
tWLQZ
tWHDX
DATA INPUT
tDVWH
tWHAX
tWHQX
AI00963
Figure 7. Chip enable controlled, WRITE AC waveforms
A0-A12
E1
tAVE1L
tAVAV
VALID
tAVE1H
tE1LE1H
tE1HAX
E2
W
DQ0-DQ7
tAVE2H
tAVWL
tAVE2L
tE2HE2L
tE2LAX
tE1HDX
tE2LDX
DATA INPUT
tDVE1H
tDVE2L
AI00964B
Doc ID 2411 Rev 11
11/31

11 Page







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