ST40RA View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'ST40RA' PDF : 94 Pages View PDF
7 Electrical specifications
ST40RA
7.8 PIO AC specifications
Reference clock in this case means the last transition of any PIO output signal within a bus, and
hence is a virtual clock.
Symbol
Parameter
PIO13:0
Min Max
PIO23:14
Min Max
Units Note
tPCHPOV
PIO reference clock high to PIO output valid -5.5
1
-5.5
1
ns
a
tPCHWDZ
PIO tri-state after PIO reference clock high -5
5
-5
5
ns
1
tPIOr
Output rise time
1
5
1
5
ns
tPIOf
Output fall time
1
5
1
5
ns
tPIOr
Input rise time
20
5
ns
b
tPIOf
Input fall time
20
5
ns
2
Table 29: PIO timings
a. No skew guarantee is made between the two separate PIO buses: PIO13:0 and PIO23:14
b. Loose input rise and fall times on PIO13:0 bus as these are schmitt trigger inputs.
PIO reference clock
PIOOUT
PIOOUT
tPCHPOV
tPCHWDZ
Figure 15: PIO AC timings
55/94 STMicroelectronics
ADCS 7260755H
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