FT51A Advanced MCU with 8051 Compatible Core IC Datasheet
Version 1.5
Document No.: FT_000877
Clearance No.: FTDI#420
4.5 Digital IO AC Characteristics
Please refer to the DIO section of the FT51A Programmer’s Guide on how to enable / disable the Schmitt
trigger, control the slew rate and determine drive strength.
Parameter
Value
load
load
Input
Timings
(ns)
0.004pF
1.32pF
tplh
tphl
tplh
tphl
0
1
1.25
1.27
0.98
1.08
2.48
2.51
2.13
2.24
Schmitt Trigger
Output
Timings
(ns)
6pF
120pF
SlewRate
= Normal
tplh
tphl
tplh
tphl
00
01
10
11
3.33 2.37
13.34 11.13
3.13
3.02
2.95
2.21 8.22 6.78
Drive Strength
2.15 6.46
5.32
4.59
2.10
5.57
Output
Timings
(ns)
6pF
120pF
SlewRate
= Slow
tplh
tphl
tplh
tphl
00
01
10
11
3.33
3.33
3.33
3.32
2.37 13.34
1.13
7.81
6.61
5.97
2.37
2.4
9.24
7.80
7.05
Drive Strength
2.39
Table 4-9 – Digital IO AC Characteristics
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