Electrical characteristics

STA8090GA

22/32

DS10820 Rev 5

Table 16 lists the DC characteristics for all the IO digital buffers expect for the following input

buffers: STBYn (23), STDBY_OUT (22), WAKEUP (25), TRSTn (20) and RSTn (24).

Table 17 lists the DC characteristics for the 1.0 V IO digital buffers input buffers: STBYn

(23), STDBY_OUT (22), WAKEUP (25), TRSTn (20) and RSTn (24).

Table 15. Low voltage detection thresholds

Parameter

Min.

Typ.

Max.

Unit

Input LVD always on

and main VRs(1)

1. Not tested in production.

Upper voltage threshold

—

1.680

—

V

Lower voltage threshold

—

1.650

—

V

Output LVD always

on VR(1)

Upper voltage threshold

—

0.995

—

V

Lower voltage threshold

—

0.935

—

V

Output LVD main VR

(1.1 V)(1)

Upper voltage threshold @ VOLM = 1.2 V

—

1.142

—

V

Lower voltage threshold @ VOLM = 1.2 V

—

1.076

—

V

Upper voltage threshold @ VOLM = 1.1 V

—

1.048

—

V

Lower voltage threshold @ VOLM = 1.1 V

—

0.986

—

V

Output LVD main VR

(1.8 V)(1)

Upper voltage threshold @ VOL1 = 1.8 V

—

1.645

—

V

Lower voltage threshold @ VOL1 = 1.8 V

—

1.626

—

V

Table 16. I/O buffers DC characteristics

Symbol

Parameter

Test

conditions

Min.

Typ.

Max.

Unit

VIL(1)

1. Excludes oscillator inputs RTC_XTI and XTAL_IN. Refer to oscillator electrical specifications.

Logical input low level voltage

VDDIO = 1.8 V

-0.3

—

0.3 * VDDIO

V

VDDIO = 3.3V

-0.3

—

0.8

V

VIH(1)

Logical input high level

voltage

VDDIO = 1.8 V

0.7 * VDDIO

—VDDIO + 0.3

V

VDDIO = 3.3V

2.0

—

VDDIO + 0.3

V

VHYST(2)

2. Apply to all digital inputs unless specified otherwise.

Schmitt-trigger hysteresis

–

50

—

mV

VOL

Low level output voltage

VDDIO = 1.8 V

—

0.4

V

VDDIO = 3.3V

—

0.4

V

VOH

High level output voltage

VDDIO = 1.8 V

VDDIO - 0.4

—

V

VDDIO = 3.3V

VDDIO - 0.4

—

V

Table 17. 1.0 V I/O buffers DC characteristics

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

VIL

Logical input low level voltage VOB = 1.0 V

-0.3

—

0.35 * VOB

V

VIH

Logical input high level voltage VOB = 1.0 V

0.65 * VOB

—VOB + 0.3

V