AN1012

TIMEKEEPER products

Doc ID 6395 Rev 4

17/33

5.2.4

M48T35 and M48T37V/Y

The M48T35 and M48T37V/Y families use the same technology as the M48T58 device, but

with a 32K x 8 SRAM array. Figure 10 and Figure 11 show the expected battery lifetime

typically 6.8 years (this assumes that a 48 mAh battery is used, see Figure 10). Devices in

than twice this (almost 17 years, see Figure 11).

Figure 10.

M48T35/37V/37Y data retention lifetime vs. temperature (48 mAh, 100%

battery backup)

Figure 11.

M48T35/37V/37Y data retention lifetime vs. temperature (120 mAh, 100%

battery backup)