EDSTRG28PLCC datasheet(33/78 Pages) TI

33 / 78 page

TIMING CONVENTIONS

1–25

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setup time

The time interval between the application of a signal at a specified input terminal and a subsequent active

transition at another specified input terminal.

NOTES:

1. The setup time is the actual time interval between two signal events and is determined by the system in which the digital circuit

operates. A minimum value is specified that is the shortest interval for which correct operation of the digital circuit is assured.

2. The setup time can have a negative value in which case the minimum limit defines the longest interval (between the active

transition and the application of the other signal) for which correct operation of the digital circuit is assured.

Example symbology:

Classified

Description

tsu(D)

Setup time, write data time to EDS high

tsu(WT-SCH)

Setup time, WAIT time to SYSCLK high

tsu(RXD-SCCH)

Setup time, SCIRXD to SCICLK high

tsu(SOMI-SPCH)

Setup time, SPISOMI to SPICLK high (polarity = 1)

tsu(SIMO-SPCH)

Setup time, SPISIMO to SPICLK high (polarity = 1)

tsu(S)

Setup time, analog to sample command

transition times (rise and fall times)

The time interval between two reference points (10% and 90% unless otherwise specified) on the same

waveform that is changing from the defined low level to the defined high level (rise time) or from the defined high

level to the defined low level (fall time).

Example symbology:

Classified

Description

Rise time

Fall time

tr(CI)

Rise time, XTAL2 / CLKIN

tf(CI)

Fall time, XTAL2 / CLKIN

valid time

D General. The time interval during which a signal is (or should be) valid.

D Output data-valid time. The time interval in which output data continues to be valid following a change of

input conditions that could cause the output data to change at the end of the interval.

Example symbology:

Classified

Description

tv(A)

Valid time, address to EDS, CSE1, CSE2, CSH1, CSH2, CSH3 and CSPF low

tv(SCCH-TXD)

Valid time, SCITXD data valid after SCICLK high

tv(SCCH-RXD)

Valid time, SCIRXD data valid after SCICLK high

tv(SPCH-SOMI)

Valid time, SPISOMI data valid after SPICLK high (polarity = 1)

tv(SPCH-SIMO)

Valid time, SPISIMO data valid after SPICLK high (polarity = 1)

tv(AB-CD) supersedes the older form tPVX.

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