M48T18-150PC STMicroelectronics, M48T18-150PC Datasheet - Page 13

• Manufacturer Part Number: M48T18-150PC
• Description: IC, TIMEKEEPER, YY-MM-DD-dd, 8KX8, DIP28
• Manufacturer: STMicroelectronics

Specifications of M48T18-150PC

• Clock Format: HH
• Clock Ic Type: Timekeeper
• Memory Configuration: 8K X 8
• Supply Voltage Range: 4.5V To 5.5V
• Digital Ic Case Style: DIP
• No. Of Pins: 28
• Date Format: YY-MM-DD-dd
• Memory Size: 64Kbit
• Nvram Features: RTC, Internal Battery, XTAL
• Interface Type: Parallel
• Access Time: 150ns
• Memory Case Style: DIP
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

M48T08, M48T08Y, M48T18
2.3
Note:
Note:
2.4
Data retention mode
With valid V
RAM. Should the supply voltage decay, the RAM will automatically power-fail deselect, write
protecting itself when V
become high impedance, and all inputs are treated as “Don't care.”
A power failure during a WRITE cycle may corrupt data at the currently addressed location,
but does not jeopardize the rest of the RAM's content. At voltages below V
user can be assured the memory will be in a write protected state, provided the V
is not less than t
reach into the deselect window during the time the device is sampling V
decoupling of the power supply lines is recommended.
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.
Power-fail interrupt pin
The M48T08/18/08Y continuously monitors V
point, an interrupt is immediately generated. An internal clock provides a delay of between
10 µs and 40 µs 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
applied, the M48T08/18/08Y operates as a conventional BYTEWIDE™ static
F
. The M48T08/18/08Y may respond to transient noise spikes on V
CC
rises past V
CC
SO
falls within the V
, the control circuit switches power to the internal battery which
Doc ID 2411 Rev 10
CC
CC
PFD
rises above V
reaches V
CC
(min) to prevent inadvertent WRITE cycles prior to
.
PFD
®
CC
top when using the SOH28 package.
PFD
(max), V
. When V
SO
(min) plus t
, the battery is disconnected and the
PFD
CC
rec
(min) window. All outputs
falls to the power-fail detect trip
after V
rec
(min). E1 should be kept
CC
exceeds V
CC
CC
Operation modes
is less than V
. Therefore,
PFD
(min), the
CC
PFD
CC
fall time
(max).
that
13/31
SO
.