UPD720122 datasheet(66/82 Pages) NEC

66 / 82 page

Data Sheet S16685EJ2V0DS

µPD720122

Parameter

Symbol

Conditions

Min.

Max.

Unit

Device event timing

Time from internal power good to device

pulling D+/D

− beyond VIHZ (min.) (signaling

attach)

TSIGATT

100

Debounce interval provided by USB system

software after attach

TATTDB

100

Inter-packet delay (for low-/full-speed)

TIPD

Bit times

Inter-packet delay for device response

w/detachable cable for low-/full-speed

TRSPIPD1

6.5

Bit times

High-speed detection start time from

suspend

TSCA

2.5

µs

Sample time for suspend vs. reset

TCSR

100

875

µs

Power down under suspend

TSUS

SUSPEND set time (SPNDOUT)

TSSP

−

SUSPEND clear time (RSUMOUT)

TCSP

−

Reversion time from suspend to high-speed

TRHS

1.333

µs

SUSPEND setup time (RSUMIN)

TSRW

−

RSUMIN active pulse width

TRWP

115

Drive chirp K width

TCKO

1ms

Finish chirp K assertion

TFCA

7ms

Start sequencing chirp K-J-K-J-K-J

TSSC

100

µs

Finish sequencing chirp K-J

TFSC

−500

−100

µs

Detect sequencing chirp K-J width

TCSI

2.5

µs

Sample time for sequencing chirp

TSCS

1.0

2.5

Reversion time to high-speed

TRHA

500

µs

High-speed detection start time

THDS

2.5

3000

µs

Reset completed time

TDRS

UPD720122 Datasheet(PDF) 66 Page - NEC

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