ST92141 datasheet(173/179 Pages) STMICROELECTRONICS

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ST92141 - ELECTRICAL CHARACTERISTICS

IMC TIMING TABLE

VDD = 5V ± 10%, TA = –40°C to +85°C, CLoad = 50pF, fINTCLK = 25MHz, unless otherwise specified)

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

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

Measurement points are taken with reference to VIH-VIH for positive pulse and VIL-VIL 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.

IMC TIMING

N°

Symbol

Parameter

Value (Note)

Unit

Formula(1)

Min

Max

TwTACLR

Tacho Low Level Minimum Pulse Width in Rising

Edge Mode

Tck

TwTACHR

Tacho High Level Minimum Pulse Width in Ris-

ing Edge Mode

Tck

TwTACHF

Tacho High Level Minimum Pulse Width in Fall-

ing Edge Mode

Tck

TwTACLF

Tacho Low Level Minimum Pulse Width in Fall-

ing Edge Mode

Tck

TwNMILR

NMI Low Level Minimum Pulse Width in Rising

Edge Mode

1000

TwNMIHR

NMI High Level Minimum Pulse Width in Rising

Edge Mode

1000

TwNMIHF

NMI High Level Minimum Pulse Width in Falling

Edge Mode

1000

TwNMILF

NMI Low Level Minimum Pulse Width in Falling

Edge Mode

1000

TdPHZ

Delay from NMI to Phases in High Impedance

1000

TACHO

NMI

UH/UL/VH/VL/WH/WL

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