ST92141 datasheet(165/179 Pages) STMICROELECTRONICS

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ST92141 - ELECTRICAL CHARACTERISTICS

STANDARD TIMER TIMING TABLE

(VDD = 5V ± 10%, TA = –40°C to +85°C, CLoad = 50pF, fINTCLK = 25MHz, Push-pull output configuration,

unless otherwise specified)

Note: The value in the left hand column shows the formula used to calculate the timing minimum or maximum from the oscillator clock period,

standard timer prescaler and counter programmed values.

The value in the right hand two columns show the timing minimum and maximum for an internal clock (INTCLK) at 25MHz, with minimum and

maximum prescaler value and minimum and maximum counter value.

Measurement points are taken with reference to VIH-VIH / VOH-VOH for positive pulse and VIL-VIL / VOL-VOL for negative pulse

(1) Formula guaranteed by design.

Legend:

Tck = INTCLK period = OSCIN period when OSCIN is not divided by 2;

2 x OSCIN period when OSCIN is divided by 2;

OSCIN period x PLL factor when the PLL is enabled.

Psc = Standard Timer Prescaler Register content (STP): from 0 to 255

Cnt = Standard Timer Counter Registers content (STH,STL): from 0 to 65535

TSTIN = Standard Timer Input signal period (STIN).

STANDARD TIMER TIMING

N°

Symbol

Parameter

Value (Note)

Unit

Formula(1)

Min

Max

TwSTOL

STOUT Low Pulse Width

4 x (Psc+1) x (Cnt+1) x Tck

160

2.69

(Psc+1) x (Cnt+1) x TSTIN

with TSTIN ≥ 8 x Tck

320

TwSTOH

STOUT High Pulse Width

4 x (Psc+1) x (Cnt+1) x Tck

160

2.69

(Psc+1) x (Cnt+1) x TSTIN

with TSTIN ≥ 8 x Tck

320

TwSTIL

STIN High Pulse Width

≥ 4 x Tck + 10

170

TwSTIH

STIN Low Pulse Width

≥ 4 x Tck + 10

170

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