M48T35 datasheet(16/28 Pages) STMICROELECTRONICS

16 / 28 page

Clock operations

M48T35, M48T35Y

16/28

Doc ID 2611 Rev 10

3.6

VCC noise and negative going transients

ICC transients, including those produced by output switching, can produce voltage

fluctuations, resulting in spikes on the VCC bus. These transients can be reduced if

capacitors are used to store energy which stabilizes the VCC bus. The energy stored in the

bypass capacitors will be released as low going spikes are generated or energy will be

absorbed when overshoots occur. A bypass capacitor value of 0.1 µF (as shown in

Figure 10) is recommended in order to provide the needed filtering.

In addition to transients that are caused by normal SRAM operation, power cycling can

generate negative voltage spikes on VCC that drive it to values below VSS by as much as

one volt. These negative spikes can cause data corruption in the SRAM while in battery

backup mode. To protect from these voltage spikes, it is recommended to connect a

Schottky diode from VCC to VSS (cathode connected to VCC, anode to VSS). Schottky diode

1N5817 is recommended for through hole and MBRS120T3 is recommended for surface

mount.

Figure 10.

Supply voltage protection

AI02169

VCC

0.1µF

DEVICE

VCC

VSS

M48T35 Arkusz danych(PDF) 16 Page - STMicroelectronics