FT4232HQ-REEL FTDI, FT4232HQ-REEL Datasheet - Page 33

• Manufacturer Part Number: FT4232HQ-REEL
• Description: USB Interface IC USB HS to Quad UART/ SPI/JTAG/I2C LQFN-64
• Manufacturer: FTDI
• Type: USB to High Speed UART/JTAG/SPI/I2Cr

Specifications of FT4232HQ-REEL

• Operating Supply Voltage: 1.8 V, 3.3 V
• Package / Case: QFN-64
• Description/function: USB High Speed to Dual UART/FIFO IC LQFP-64
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Operating Temperature Range: - 40 C to + 85 C
• Supply Current: 70 mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

6.3 Oscillator Configuration
Figure 6.5 Recommended FT4232H Crystal Oscillator Configuration.
Figure 6.5 illustrates how to connect the FT4232H 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 FT4232H. 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
FT4232H
OSCO
FT4232H QUAD HIGH SPEED USB TO MULTIPURPOSE UART/MPSSE IC
Minimum
2.97
Typical
< 150
3.30
12
Maximum
3.63
Document No.: FT_000060
Clearance No.: FTDI#78
Units
Datasheet Version 2.10
MHz
pS
V
+/- 30ppm
Conditions
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