IO33lib Low Slew Rate
Cells
The IO33lib cells comprise a series of 2.5V/3.3V input/output pads developed for low
supply voltage processes in order to interface 2.5V ASICs to 3.3V environments.
All IO33lib cells are slew rate controlled. Advantage has been taken of the 2.5V to 3.3V
level shifter (slow by construction) to reduce the slew rate without reducing speed.
Table 11. IO33lib Pads
3V Interface
Pad Name
3-State
I/O
Output
Only
3-State
Output Only
Input
Only
Drive
Strength
Pad Sites
Used
pc33b0x
•
2 mA, 4 mA,
8 mA, 16 mA
1
pc33d00
•
1
pc33o0x
•
2 mA, 4 mA,
8 mA, 16 mA
1
pc33t0x
•
2 mA, 4 mA,
8 mA, 16 mA
1
Note: All 3-state I/Os, 3-state output only and input pads are also available with pull-up and
pull-down device.
Table 12. IO33lib Power Pads
Cell Name
pv33e00
pv33i00
pv33i25
pv33e33
pv33ecrn
vssi
•
Power Bus Connections
mixvss
vddi
•
•
•
mixvdd
•
•
Pad Sites
Used
1
1
1
1
2
6 ATC25 Summary
1306DS–CBIC–09/02