m48t18 STMicroelectronics, m48t18 Datasheet - Page 13

• Manufacturer Part Number: m48t18
• Description: 5v, 64kbit 8 Kb X 8 Timekeeper Sram
• Manufacturer: STMicroelectronics

Note:
Power-fail interrupt pin
When V
preserves data and powers the clock. The internal button cell will maintain data in the
M48T08/18/08Y for an accumulated period of at least 10 years when V
Requires use of M4T32-BR12SH SNAPHAT
As system power returns and V
power supply is switched to external V
Write protection continues until V
high or E2 low as V
system stabilization. Normal RAM operation can resume t
For more information on Battery Storage Life refer to the Application Note AN1012.
The M48T08/18/08Y continuously monitors V
point, an interrupt is immediately generated. An internal clock provides a delay of between
10µs and 40µs before automatically deselecting the M48T08/18/08Y. The INT pin is an
open drain output and requires an external pull up resistor, even if the interrupt output
function is not being used.
CC
drops below V
CC
rises past V
SO
, the control circuit switches power to the internal battery which
CC
CC
PFD
rises above V
reaches V
CC
(min) to prevent inadvertent WRITE cycles prior to
.
®
CC
top when using the SOH28 package.
PFD
. When V
SO
(min) plus t
, the battery is disconnected and the
CC
rec
falls to the power-fail detect trip
after V
rec
(min). E1 should be kept
CC
exceeds V
CC
is less than V
PFD
(max).
13/30
SO
.