PXS20 Datasheet, PDF (81/119 Pages) Freescale Semiconductor, Inc – PXS20 Microcontroller

Electrical characteristics
Table 16. Voltage regulator electrical specifications (continued)
Symbol
Parameter
Conditions
Min
— SR Supply ramp rate
—
3
— D LVD_MAIN: Time
3.3V noise rejection at the
1.1
constant of RC filter at
input of
LVD input
LVD comparator
— D HVD_DIG: Time constant 1.2V noise rejection at the
0.1
of RC filter at LVD input
input of
LVD comparator
— D LVD_DIG: Time constant 1.2V noise rejection at the
0.1
of RC filter at LVD input
input of
LVD comparator
Typ
Max
Unit
—
0.5 ×10⁶ V/s
—
—
µs
—
—
µs
—
—
µs
BCRTL
V_DD
BCP68
V1V2 ring on board
C_int
PXS20
R_b ^Lb
R_s
C_v1v2
ESR
C_ext
V1V2 pin
Figure 5. BCP68 board schematic example
NOTE
The combined ESR of the capacitors used on 1.2 V pins (V1V2 in the picture) shall be in
the range of 30 m to 150 m. The minimum value of the ESR is constrained by the
resonance caused by the external components, bonding inductance, and internal
decoupling. The minimum ESR is required to avoid the resonance and make the regulator
stable.
PXS20 Microcontroller Data Sheet, Rev. 1
Freescale Semiconductor
81
Preliminary—Subject to Change Without Notice