I960 Datasheet, PDF (40/70 Pages) Intel Corporation – i960 RP/RD I/O PROCESSOR AT 3.3 VOLTS

i960^® Rx I/O Processor at 3.3 V
4.0 ELECTRICAL SPECIFICATIONS
4.1 Absolute Maximum Ratings
Parameter
Maximum Rating
Storage Temperature
–55° C to + 125° C
Case Temperature Under Bias 0° C to + 95° C
Supply Voltage wrt. V_SS
–0.5 V to + 4.6 V
Supply Voltage wrt. V_SS on V_CC5 –0.5 V to + 6.5 V
Voltage on Any Ball wrt. V_SS –0.5 V to V_CC + 0.5 V
NOTICE: This data sheet contains information on
products in the sampling and initial production
phases of development. The specifications are
subject to change without notice. Contact your
local Intel representative before finalizing a design.
WARNING: Stressing the device beyond the
“Absolute Maximum Ratings” may cause
permanent damage. These are stress ratings only.
Operation beyond the “Operating Conditions” is not
recommended and extended exposure beyond the
“Operating Conditions” may affect device reliability.
Table 16. Operating Conditions
Symbol
V_CC
V_CC5
F_{S_CLK}
T_C
Parameter
Supply Voltage
Input Protection Bias
Input Clock Frequency
Case Temperature Under Bias
GC80960Rx (352 HL-PBGA)
Min
Max
Units
Notes
3.0
3.6
V
3.0
5.25
V
16
33.33
MHz
0
95
°C
4.2 V_CC5 Pin Requirements (V_DIFF)
In mixed voltage systems that drive 80960Rx
processor inputs in excess of 3.3 V, the V_CC5 pin
must be connected to the system’s 5 V supply. To
limit current flow into the V_CC5 pin, there is a limit to
the voltage differential between the V_CC5 pin and the
other V_CC pins. The voltage differential between the
80960Rx V_CC5 pin and its 3.3 V V_CC pins should
never exceed 2.25 V. This limit applies to power-up,
power-down, and steady-state operation. Table 17
outlines this requirement.
Meeting this requirement ensures proper operation
and guarantees that the current draw into the V_CC5
pin does not exceed the I_CC5 specification.
If the voltage difference requirements cannot be met
due to system design limitations, an alternate
solution may be employed. As shown in Figure 7, a
minimum of 100 Ω series resistor may be used to
limit the current into the V_CC5 pin. This resistor
ensures that current drawn by the V_CC5 pin does not
exceed the maximum rating for this pin.
+5 V (±0.25 V)
V_CC5 Pin
100 Ω
(±5%, 0.5 W)
Figure 7. VCC5 Current-Limiting Resistor
This resistor is not necessary in systems that can
guarantee the V_DIFF specification.
In 3.3 V-only systems and systems that drive
80960Rx pins from 3.3 V logic, connect the V_CC5 pin
directly to the 3.3 V V_CC plane.
Table 17. V_DIFF Specification for Dual Power Supply Requirements (3.3 V, 5 V)
Symbol Parameter Min Max Units
Notes
V_DIFF
V_CC5-V_CC
Difference
2.25
V V_CC5 input should not exceed V_CC by more than 2.25 V
during power-up and power-down, or during steady-state
operation.
34
ADVANCE INFORMATION