FT2232HQ-REEL FTDI, FT2232HQ-REEL Datasheet - Page 53

• Manufacturer Part Number: FT2232HQ-REEL
• Description: USB Interface IC USB HS to Dual UART/ FIFO/SPI/JTAG/I2C
• Manufacturer: FTDI

Specifications of FT2232HQ-REEL

• Mounting Style: SMD/SMT
• Package / Case: QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

6.3 Oscillator Configuration
Figure 6.5 Recommended FT2232H Crystal Oscillator Configuration.
Figure 6.5 illustrates how to connect the FT2232H 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 parallel cut type crystal.
It is also possible to use a 12 MHz Oscillator with the FT2232H. 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.
Table 6.1 OSCI Input characteristics
Parameter
Crystal
OSCI Vin
12MHz
FIn
Ji
27pF
27pF
Cycle to cycle jitter
Input Frequency
Input Voltage
Description
Copyright © 2010 Future Technology Devices International Limited
2
3
OSCI
FT2232H
OSCO
FT2232H DUAL HIGH SPEED USB TO MULTIPURPOSE UART/FIFO IC
Minimum
2.97
Typical
< 150
3.30
12
Maximum
3.63
Document No.: FT_000061
Units
MHz
pS
V
Clearance No.: FTDI#77
Datasheet Version 2.10
+/- 30ppm
Conditions
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