M48T18-150PC STMicroelectronics, M48T18-150PC Datasheet - Page 5

• 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
1
Description
The M48T08/18/08Y TIMEKEEPER
time clock which is pin and function compatible with the DS1643. The monolithic chip is
available in two special packages to provide a highly integrated battery-backed memory and
real-time clock solution.
The M48T08/18/08Y is a non-volatile pin and function equivalent to any JEDEC standard
8 K 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 M48T08/18/08Y 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
design allows the SNAPHAT
after the completion of the surface mount process. Insertion of the SNAPHAT
reflow prevents potential battery and crystal damage due to the high temperatures required
for device surface-mounting. The SNAPHAT
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 (e.g., SNAPHAT
part number is “M4T28-BR12SH” or “M4T32-BR12SH”.
Figure 1.
Logic diagram
A0-A12
®
E1
E2
Doc ID 2411 Rev 10
battery package to be mounted on top of the SOIC package
W
G
13
®
®
housing containing the battery and crystal. The unique
RAM is an 8 K x 8 non-volatile static RAM and real-
V CC
V SS
M48T08Y
M48T08
M48T18
®
housing is keyed to prevent reverse insertion.
8
DQ0-DQ7
INT
®
housing after
Description
AI01020
®
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