M48T35AV Datasheet PDF - ST Microelectronics
| Part Number | M48T35AV | |
| Description | 256 Kbit (32 Kbit x 8) TIMEKEEPER SRAM | |
| Manufacturers | ST Microelectronics | |
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M48T35AV
3.3 V, 256 Kbit (32 Kbit x 8) TIMEKEEPER® SRAM
Features
■ Integrated, ultra low power SRAM, real-time
clock, power-fail control circuit and battery
■ BYTEWIDE™ RAM-like clock access
■ BCD coded year, month, day, date, hours,
minutes, and seconds
■ Battery low flag (BOK)
■ Frequency test output for real-time clock
■ Automatic power-fail chip deselect and WRITE
protection
■ WRITE protect voltage
(VPFD = power-fail deselect voltage):
– M48T35AV: VCC = 3.0 to 3.6 V;
2.7 V ≤ VPFD ≤ 3.0 V
■ Self-contained battery and crystal in the
CAPHAT™ DIP package
■ SOIC package provides direct connection for a
SNAPHAT® housing containing the battery and
crystal
■ SNAPHAT® housing (battery and crystal) is
replaceable
■ Pin and function compatible with JEDEC
standard 32 Kbit 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 6845 Rev 9
1/29
www.st.com
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M48T35AV
1 Description
Description
The M48T35AV TIMEKEEPER® RAM is a 32 Kbit x 8 non-volatile static RAM and real-time
clock. The monolithic chip is available in two special packages to provide a highly integrated
battery-backed memory and real-time clock solution.
The M48T35AV is a non-volatile pin and function equivalent to any JEDEC standard
32 Kb 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 M48T35AV 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 part numbers are M4T28-BR12SH1 (48
mAh lithium battery SNAPHAT), M4T32-BR12SH1 (120 mAh lithium battery SNAPHAT),
and M4T32-BR12SH6 (120 mAh lithium battery SNAPHAT, –40 to +85 °C crystal).
Figure 1. Logic diagram
VCC
15
A0-A14
8
DQ0-DQ7
W
M48T35AV
E
G
VSS
AI02797B
Doc ID 6845 Rev 9
5/29
Preview 5 Page |
Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for M48T35AV electronic component. |
| Information | Total 29 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ M48T35AV.PDF Datasheet ] | |
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