M48T59 查看數據表（PDF） - STMicroelectronics
零件编号
产品描述 (功能)
生产厂家
M48T59 Datasheet PDF : 29 Pages
| |||
M48T59, M48T59Y, M48T59V*
SUMMARY DESCRIPTION
The M48T59/Y/V TIMEKEEPER® RAM is an
8 Kb x8 non-volatile static RAM and real time
clock. The monolithic chip is available in two spe-
cial packages to provide a highly integrated bat-
tery backed-up memory and real time clock
solution.
The M48T59/Y/V is a non-volatile pin and function
equivalent to any JEDEC standard 8 Kb x8 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, 600mil DIP CAPHAT™ houses the
M48T59/Y/V silicon with a quartz crystal and a
long life lithium button cell in a single package.
The 28-pin, 330mil SOIC provides sockets with
gold plated contacts at both ends for direct con-
nection to a separate SNAPHAT® housing con-
taining 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. Inser-
tion of the SNAPHAT housing after reflow pre-
vents potential battery and crystal damage due to
the high temperatures required for device surface-
mounting. The SNAPHAT housing is keyed to pre-
vent 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 bat-
tery/crystal package (e.g., SNAPHAT) part num-
ber is “M4T28-BR12SH” or “M4T32-BR12SH”
(see Table 19., page 27).
Caution: Do not place the SNAPHAT battery/crys-
tal top in conductive foam, as this will drain the lith-
ium button-cell battery.
Figure 3. Logic Diagram
VCC
13
A0-A12
8
DQ0-DQ7
W
M48T59
M48T59Y
E
M48T59V
IRQ/FT
G
RST
VSS
AI01380E
Table 1. Signal Names
A0-A12
Address Inputs
DQ0-DQ7 Data Inputs / Outputs
IRQ/FT
Interrupt / Frequency Test Output
(Open Drain)
RST
Reset Output (Open Drain)
E
Chip Enable
G
Output Enable
W
Write Enable
VCC
Supply Voltage
VSS
Ground
4/29
Share Link: 