M48T59VMH 查看數據表（PDF） - STMicroelectronics
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M48T59VMH Datasheet PDF : 21 Pages
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Figure 3. Block Diagram
IRQ/FT
M48T59, M48T59Y, M48T59V
32,768 Hz
CRYSTAL
LITHIUM
CELL
OSCILLATOR AND
CLOCK CHAIN
16 x 8 BiPORT
SRAM ARRAY
POWER
VOLTAGE SENSE
AND
SWITCHING
CIRCUITRY
VPFD
8176 x 8
SRAM ARRAY
A0-A12
DQ0-DQ7
E
W
G
VCC
RST
VSS
AI01383D
DESCRIPTION
The M48T59/59Y/59V TIMEKEEPER® RAM is an
8Kb x8 non-volatile static RAM and real time clock.
The monolithic chip is available in two special
packages to provide a highly integrated battery
backed-up memory and real time clock solution.
The M48T59/59Y/59V is a non-volatile pin and
function equivalent to any JEDEC standard 8Kb 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
M48T59/59Y/59V 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 contain-
ing 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.
Table 4. AC Measurement Conditions
Input Rise and Fall Times
≤ 5ns
Input Pulse Voltages
0 to 3V
Input and Output Timing Ref. Voltages
1.5V
Note that Output Hi-Z is defined as the point where data is no longer
driven.
Figure 4. AC Testing Load Circuit
DEVICE
UNDER
TEST
645Ω
CL = 100pF
1.75V
CL includes JIG capacitance
Note: Excluding open-drain output pins.
AI02325
3/21
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