I960 datasheet(40/70 Pages) INTEL

40 / 70 page

i960® Rx I/O Processor at 3.3 V

ADVANCE INFORMATION

4.0

ELECTRICAL SPECIFICATIONS

4.1

Absolute Maximum Ratings

4.2

VCC5 Pin Requirements (VDIFF)

In mixed voltage systems that drive 80960Rx

processor inputs in excess of 3.3 V, the VCC5 pin

must be connected to the system’s 5 V supply. To

limit current flow into the VCC5 pin, there is a limit to

the voltage differential between the VCC5 pin and the

other VCC pins. The voltage differential between the

80960Rx VCC5 pin and its 3.3 V VCC 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 VCC5

pin does not exceed the ICC5 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 VCC5 pin. This resistor

ensures that current drawn by the VCC5 pin does not

exceed the maximum rating for this pin.

Figure 7. VCC5 Current-Limiting Resistor

This resistor is not necessary in systems that can

guarantee the VDIFF specification.

In 3.3 V-only systems and systems that drive

80960Rx pins from 3.3 V logic, connect the VCC5 pin

directly to the 3.3 V VCC plane.

Parameter

Maximum Rating

Storage Temperature

–

° C to + 125° C

Case Temperature Under Bias

° C to + 95° C

Supply Voltage wrt. VSS

–

0.5 V to + 4.6 V

Supply Voltage wrt. VSS on VCC5 –0.5 V to + 6.5 V

Voltage on Any Ball wrt. VSS

–

0.5 V to VCC + 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

Parameter

Min

Max

Units

Notes

VCC

Supply Voltage

3.0

3.6

VCC5

Input Protection Bias

3.0

5.25

FS_CLK

Input Clock Frequency

33.33

MHz

Case Temperature Under Bias

GC80960Rx (352 HL-PBGA)

°C

+5 V (±0.25 V)

VCC5 Pin

100

Ω

(±5%, 0.5 W)

Table 17. VDIFF Specification for Dual Power Supply Requirements (3.3 V, 5 V)

Symbol

Parameter

Min

Max

Units

Notes

VDIFF

VCC5-VCC

Difference

2.25

VCC5 input should not exceed VCC by more than 2.25 V

during power-up and power-down, or during steady-state

operation.

I960 Datasheet(PDF) 40 Page - Intel Corporation

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