FT221XS-R FTDI, FT221XS-R Datasheet - Page 30
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FT221XS-R
Manufacturer Part Number
FT221XS-R
Description
USB Interface IC USB to 8 bit SPI / FT1248 IC SSOP-20
Manufacturer
FTDI
Datasheet
1.FT221XS-R.pdf
(47 pages)
Specifications of FT221XS-R
Rohs
yes
Product
USB 2.0
Data Rate
12 Mbps, 480 Mbps
Interface Type
USB
Operating Supply Voltage
2.97 V to 5.5 V
Operating Supply Current
8.1 mA to 13.1 mA
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
SSOP-20
Tradename
X-Chip
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
FT221XS-R
Manufacturer:
FTDI
Quantity:
780
FT221X USB 8-BIT SPI/FT1248 IC Datasheet
Version 1.2
Document No.: FT_000630 Clearance No.: FTDI# 263
8
Application Examples
The following sections illustrate possible applications of the FT221X. The illustrations have omitted pin
numbers for ease of understanding since the pins differ between the FT221XS and FT221XQ package
options.
8.1 USB to FT1248 Converter
Figure 8.1 Application Example showing USB to FT1248 host
NOTE: ALL IO LINES SHOULD HAVE A 10k PULL UP TO VCCIO
The FT1248 can be used with 1-bit, 2-bit, 4-bit or 8-bit wide data. The Figure 8.1 is showing 8 bit mode.
By using 8 data bits you need fewer clock cycles to get the data across.
The FT221X is the slave device and the external FPGA/MCU is the bus master. The FT221X will auto
detect the bus width from the initial command byte sent by the controller. If not using all 8 data lines the
pins may be left unterminated as an internal pull-up ensures the device detects a logic 1.
Timing diagrams for 8-bit accesses can be seen in figures 8.2 and 8.3. For further information on the
mode see AN_167 FT1248 Basics from the FTDI website.
Copyright © 2013 Future Technology Devices International Limited
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