FT933Q-R datasheet(44/65 Pages) BRIDGETEK

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FT93x Datasheet Embedded Microcontroller Datasheet

Version 1.5

Document Reference No.: BRT_000051

Clearance No.: BRT#049

Parameter

Description

Minimum

Typical

Maximum

Units

Conditions

Vchirpj

Chirp-J output voltage

(Differential)

700

1100

Vchirpk

Chirp-K output

voltage (Differential)

-900

-500

Input level for full speed and low speed

Vdi

Differential input

voltage sensitivity

0.2

|Vdp-Vdm|

Vcm

Differential common

mode voltage

0.8

2.5

Vse

Single ended receiver

threshold

0.8

2.0

Output level for full speed and low speed

Vol

Low level output

voltage

0.3

Voh

High level output

voltage

2.8

3.6

Resistance

Rdrv

Driver output

impedance

40.5

49.5

ohm

Equivalent

resistance used as

an internal chip

Table 5-4 USB I/O Pin (D_DP/D_DM) Characteristics

5.3

AC Characteristics

AC Characteristics (Ambient Temperature = -40°C to +85°C)

System clock dynamic characteristics

Parameter

Value

Unit

Minimum

Typical

Maximum

Crystal oscillator

Clock frequency

12.00

MHz

External clock input

External clock

jitter

500

Clock duty cycle

Input voltage on

pin XI/CLKIN

3.3

Table 5-5 System clock characteristics

Note: Recommended accuracy of the clock frequency is 50ppm for the crystal.

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