58.1 Electrical Parameters Usage

Tables in sections 58.5 I/O Characteristics, 58.6 Digital Peripheral Timings, 58.7 Analog Peripheral Characteristics, 58.8 Power Consumption in Active Mode and 58.9 Operation and Power Consumption in Low-Power Modes define the limiting values for several electrical parameters.

Unless otherwise noted, these values are valid over the junction temperature range T_J= [-40°C + 125°C].
Parameters annotated as "Simulation data" are not production-tested. Their limiting values come from simulations run in corner case conditions and were verified by electrical characterization over a limited number of samples.
These limits may be affected by the board on which the device is mounted. In particular, noisy supply and ground conditions must be avoided and care must be taken to provide:
- a PCB with a low-impedance ground plane. A single unbroken ground plane is a minimum requirement.
- low-impedance decoupling of the device power supply inputs. A 10 nF to 220 nF Ceramic X7R (or X5R) capacitor placed very close to each power supply input is a minimum requirement. See specific recommendations regarding analog pins or functions in the corresponding sections. To reduce any potential electromagnetic compatibility (EMC) related issues, it is good practice to double this decoupling capacitor whenever possible with a high frequency one, for example one 100 pF (C0G or NP0) per power supply input.
- low-impedance power supply decoupling of external components. This recommendation aims at avoiding large current spikes flowing into the PCB ground and power planes.
In addition, although the device is specified with wide operating supply ranges on most of its supply inputs (for example 1.7V to 3.6V), large and fast supply variations may lead to unpredictable device behavior including, but not limited to, out-of-specification operation. Therefore, in addition to maintaining the power supply inputs within their specified ranges, it is mandatory to keep the power supply variations within the limits shown in the following table during the device operation.

Table 58-1. Maximum Power Supply Variations
Symbol	Parameter	Conditions	Min	Max	Unit
V_N	Peak-to-peak ripple and noise voltage	Applies to: VDDCORE, VDDBU, VDDIOP0, VDDIOP1, VDDQSPI, VDDNF, VDDIOM	–	3	% V_DC⁽¹⁾
V_N	Peak-to-peak ripple and noise voltage	Applies to: VDDIN33, VDDANA	–	1	% V_DC⁽¹⁾
SR	Slewrate of power supply variations	ΔV ≤ 5% V_{DC_MIN}⁽²⁾⁽³⁾	–	±50	V/ms
		ΔV ≤ 10% V_{DC_MIN}	–	±10	V/ms
		ΔV > 10% V_{DC_MIN}	–	±1	V/ms

Note:

V_DC is the power supply DC value.
V_{DC_MIN} is the minimum operating voltage of the supply input as described in table Recommended Operating Conditions on Power Supply Inputs.
ΔV is the variation amplitude. The slewrate specification applies when ΔV ≥ V_N.

The following examples and figure illustrate the above table:

When working with VDDIOP0 = 3.3V, a maximum power supply ripple and noise voltage of 99 mV peak-to-peak (3% of 3.3V) must be respected.
When working with VDDIN33 = 3.3V, a maximum power supply ripple and noise voltage of 33 mV peak-to-peak (1% of 3.3V) must be respected.

Figure 58-1. Maximum Power Supply Variation