RX231 datasheet(98/177 Pages) RENESAS

98 / 177 page

R01DS0261EJ0110 Rev.1.10

Page 98 of 177

Oct 30, 2015

RX230 Group, RX231 Group

5. Electrical Characteristics

Note 1. When OFS1.(FASTSTUP, LVDAS) bits are 11b.

Note 2. When OFS1.(FASTSTUP, LVDAS) bits are 01b.

Note 3. When OFS1.LVDAS bit is 0.

Note 4. Turn on the power supply voltage according to the normal startup rising gradient because the settings in the OFS1 register are

not read in boot mode.

Figure 5.7

Ripple Waveform

Note:

The recommended capacitance is 4.7

μF. Variations in connected capacitors should be within the above range.

Table 5.13

DC Characteristics (11)

Conditions: 0 V

≤ VCC = VCC_USB = AVCC0 ≤ 5.5 V, VSS = AVSS0 = VSS_USB = 0 V, T

a = –40 to +105°C

Item

Symbol

Min.

Typ.

Max.

Unit

Test Conditions

Power-on VCC rising

gradient

At normal startup*1

SrVCC

0.02

—

ms/V

During fast startup time*2

0.02

—

Voltage monitoring 0 reset

enabled at startup*3, *4

0.02

—

Table 5.14

DC Characteristics (12)

Conditions: 1.8 V

≤ VCC = VCC_USB = AVCC0 ≤ 5.5 V, VSS = AVSS0 = VSS_USB = 0 V, T

a = –40 to +105°C

The ripple voltage must meet the allowable ripple frequency fr (VCC) within the range between the VCC upper limit and lower limit.

When VCC change exceeds VCC ±10%, the allowable voltage change rising/falling gradient dt/dVCC must be met.

Item

Symbol

Min.

Typ.

Max.

Unit

Test Conditions

Allowable ripple frequency

fr (VCC)

—

kHz

Figure 5.7

Vr (VCC) ≤ VCC × 0.2

—

MHz

Figure 5.7

Vr (VCC) ≤ VCC × 0.08

—

MHz

Figure 5.7

Vr (VCC) ≤ VCC × 0.06

Allowable voltage change

rising/falling gradient

dt/dVCC

1.0

—

ms/V

When VCC change exceeds VCC ±10%

Table 5.15

DC Characteristics (13)

Conditions: 1.8 V

≤ VCC = VCC_USB = AVCC0 ≤ 5.5 V, VSS = AVSS0 = VSS_USB = 0 V, T

a = –40 to +105°C

Item

Symbol

Min.

Typ.

Max.

Unit

Test Conditions

Permissible error of VCL pin external

capacitance

CVCL

1.4

4.7

7.0

μF

Vr(VCC)

VCC

1 / fr(VCC)

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