MB91F313 datasheet(19/71 Pages) FUJITSU

19 / 71 page

MB91313 Series

• Notes on the turning on/off VDDI pin (1.8 V internal power supply) and VDDE pin (3.3 V external pin power supply)

Do not apply only VDDE pin (external power supply) voltage continuously (more than one minute) while the

VDDI pin (internal power supply) is disconnected as it will adversely affect the reliability of the LSI.

When the VDDE pin (external power supply) returns from the off state to the on state, the circuit may not be

able to maintain its internal state, for example, due to power supply noise.

When the power is turned on, the states of the output pins may remain undefined until the internal power supply

becomes stable.

• Notes on using an external clock

When using the external clock as a general rule you should simultaneously supply X0 (X0A) and X1 (X1A) pins.

And also, the clock signal to X0 (X0A) should be supplied a clock signal with the reverse phase to X1 (X1A) pins.

However, in this case the stop mode (oscillation stop mode) must not be used (This is because the X1 (X1A)

pin stops at “H” output in STOP mode). Furthermore, supply a clock to X0 (X0A) pin only if the device is operating

in less than 12.5 MHz.

Note : When operating at a frequency of 10 MHz, the delay between the X0 (X0A) and X1 signals should be less

than 15 ns.

Power on

VDD pin (internal power supply)

→ VDDE pin (external power supply) → Analog→ Signal

Power off

Signal

→ Analog→ VDDE pin (external power supply) → VDDI pin (internal power supply)

X0, X0A

X1, X1A

Cannot be used in STOP mode (oscillation stop mode).

MB91313 series

Using an External Clock (Normal Method)

X0, X0A

X1, X1A

Open

MB91313 series

Using an External Clock (available at 12.5 MHz or less)

MB91F313 Datasheet(PDF) 19 Page - fujitsu semiconductor