PXN20 Datasheet, PDF (42/60 Pages) Freescale Semiconductor, Inc – PXN20 Microcontroller

Electrical characteristics
Table 24. De-rated pad AC specifications (3.3 V, 3.3 V)¹ (continued)
Spec
Pad Type²
SRC/DSC³
Out Delay^4,5
(ns)
Rise/Fall^6,
(ns)
Load Drive
(pF)
00
1.2
10
3
Fast⁸
01
1.2
20
2.5
10
1.2
30
11
1.2
50
4
Input
N/A
3/3
1.5/1.5
0.5
1 _{These are worst case values that are estimated from simulation and not tested. The values in the table are simulated at}
F_SYS = 116 MHz, V_DD = 1.08 – 1.32 V, V_DDE = 3.0 – 3.6 V, V_DDEH = 3.0 – 3.6 V, V_RC33 and V_DDPLL = 3.0 – 3.6 V, T_A = T_L to
T_H.
2 _{Slow = SH or SHA; Medium = MH or MHA; Fast = F; Input = IHA. See Table 3.}
3 _{SRC/DSC are bit fields in the Pad Configuration Registers. SRC—Slew Rate Control (slow and medium pad types only),}
DSC—Drive Strength Control (fast pad type only).
4 _{This parameter is supplied for reference and is not guaranteed by design and not tested.}
5 _{Delay and rise/fall are measured to 20% or 80% of the respective signal.}
6 _{This parameter is guaranteed by characterization before qualification rather than 100% tested.}
7 _{Add a maximum of one system clock to the output delay for delay with respect to system clock.}
8 _{Output delay is shown in Figure 6. Add a maximum of one system clock to the output delay for delay with respect to system}
clock.
Pad
Internal Data Input Signal
Rising
Edge
Out
Delay
Falling
Edge
Out
Delay
Pad
Output
Figure 6. Pad output delay
VDD/2
V_OH
V_OL
PXN20 Microcontroller Data Sheet, Rev. 1
42
Freescale Semiconductor