FT232HL-REEL Datasheet, PDF (55/66 Pages) Future Technology Devices International Ltd. – Single Channel Hi-Speed USB to Multipurpose UART/FIFO IC

Document No.: FT_000288
FT232H SINGLE CHANNEL HI-SPEED USB TO MULTIPURPOSE UART/FIFO IC
Datasheet Version 1.82
Clearance No.: FTDI #199
6.3 Oscillator Configuration
Figure 6.4 Recommended FT232H Oscillator Configuration
Figure 6.4 illustrates how to connect the FT232H with a 12MHz ± 0.003% crystal. In this case loading
capacitors should to be added between OSCI, OSCO and GND as shown. A value of 27pF is shown as the
capacitor in the example – this will be good for many crystals but it is recommended to select the loading
capacitor value based on the manufacturer’s recommendations wherever possible. It is recommended to
use a fundamental mode, parallel cut type crystal.
It is also possible to use a 12 MHz Oscillator with the FT232H. In this case the output of the oscillator
would drive OSCI, and OSCO should be left unconnected. The oscillator must have a CMOS output drive
capability.
Parameter
Description
Minimum Typical Maximum
Units
Conditions
OSCI Vin
Input Voltage
Fin
Input Frequency
Ji
Cycle to cycle jitter
Table 6.1 OSCI Input characteristics
2.97
3.3V
12MHz
<150
3.63
V
MHz
pS
± 30ppm
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