Z86L997 datasheet(39/102 Pages) ZILOG

39 / 102 page

Z86D990/Z86D991 OTP and Z86L99X ROM

Low-Voltage Microcontrollers with ADC

PS003807-1002

Z86D99/Z86L99

Figure 16. Active Glitch/Power Filter

When the internal power/glitch filter is not used, both VDD_padring and VDD_CORE

must be connected together externally to the power supply.

When the internal circuitry is used, the VDD_padring has to be connected to the

power supply and the VDD_CORE has to be connected to an external energy stor-

age capacitor (1

−10 µF range). The core is connected only to this capacitor during

power supply glitches.

Table 8 describes the active glitch/filter specifications.

On the wafer level, all three power buses are available. Depending on the number

of pins of the package, one or more power buses are connected together.

The active glitch/power filter effectively increases the noise immunity for battery-

operated designs where the controller is driving high current loads (for example,

IR LED).

Table 8. Active Glitch/Filter Specifications (Preliminary)

Parameter

Max

Min

Condition

Diff. stage gain

75 dB

Diff. stage bandwidth

15 MHz

Rise time

255 ns

50 mV pulse

Fall time

214 ns

50 mV pulse

Rdson

Ω

Z86L997 Datasheet(PDF) 39 Page - Zilog, Inc.