FT221XS-U FTDI, FT221XS-U Datasheet - Page 18

• Manufacturer Part Number: FT221XS-U
• Description: USB Interface IC USB to 8 bit SPI / FT1248 IC SSOP-20
• Manufacturer: FTDI

Specifications of FT221XS-U

• Rohs: yes
• Tradename: X-Chip

5.5 FT1248 Timing
Figure 5.4: FT1248 Clock Format CPHA = 1
The timings will vary depending on VCCIO.
T1
T2
T3
T4
T5
T6
T7
T8
Table 5.3: 1V8 VCCIO timings
T1
T2
T3
T4
Min (ns)
Min (ns)
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Typical (ns)
83.33ns
41.67ns
41.67ns
1
25
3
5
5
Typical (ns)
83.33ns
41.67ns
41.67ns
1
Max (ns)
30
Max (ns)
15
Description
SCLK Period
SCLK HIGH
SCLK LOW
SCLK rising or falling driving edge to
MIOSIO/MSIO
MIOSIO setup time to rising or falling sample
SCLK edge
MIOSIO hold time from rising or falling sample
SCLK edge
SS_n setup time to rising or falling SCLK edge
SS_n hold time from rising or falling sample SCLK
edge
Description
SCLK Period
SCLK HIGH
SCLK LOW
SCLK rising or falling driving edge to
MIOSIO/MSIO
Document No.: FT_000630 Clearance No.: FTDI# 263
Version 1.2
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