mcimx50 Freescale Semiconductor, Inc, mcimx50 Datasheet - Page 35

• Manufacturer Part Number: mcimx50
• Description: I.mx50 Applications Processors For Consumer Products
• Manufacturer: Freescale Semiconductor, Inc

4.4.3
Table 23
Freescale Semiconductor
Output driver
impedance
Output driver
impedance
Parameter
shows the HVIO output buffer impedance of the i.MX50 processor.
HVIO Output Buffer Impedance
Symbol
Output driver impedance is measured with long transmission line of
impedance Ztl attached to I/O pad and incident wave launched into
transmission line. Rpu/Rpd and Ztl form a voltage divider that defines
specific voltage of incident wave relative to OVDD. Output driver
impedance is calculated from this voltage divider (see
Rpu
Rpd
Low drive strength, Ztl = 150 Ω
Medium drive strength, Ztl = 75 Ω
High drive strength, Ztl = 50 Ω
Low drive strength, Ztl =1 50 Ω
Medium drive strength, Ztl = 75 Ω
High drive strength, Ztl = 50 Ω
i.MX50 Applications Processors for Consumer Products, Rev. 0
Test Conditions
Table 23. HVIO Output Buffer Impedance
NOTE
1.95 V
OVDD
113.5
56.2
37.8
78.5
39.7
26.8
Min
OVDD
103.8
3.3 V
51.9
35.1
34.5
70
23
1.875 V
OVDD
130.6
113.6
Figure
45.9
56.8
38.3
66
Typ
3).
OVDD
3.30V
69.2
33.3
133
102
41
50
Electrical Characteristics
OVDD
1.65 V
219.4
109.7
230.8
115.4
73.1
76.9
Max
OVDD
2.68 V
212.2
111.1
179.5
71.8
89.8
60.7
Unit
Ω
Ω
35