80960CF-33 datasheet(30/77 Pages) INTEL

30 / 77 page

80960CF-40, -33, -25, -16

PRELIMINARY

4.3

Recommended Connections

Power and ground connections must be made to

multiple VCC and VSS (GND) pins. Every 80960CF-

based circuit board should include power (VCC) and

ground (VSS) planes for power distribution. Every

VCC pin must be connected to the power plane, and

every VSS pin must be connected to the ground

plane.

Pins

identified

“NC”

must

not be

connected in the system.

Liberal decoupling capacitance should be placed

near the 80960CF. The processor can cause tran-

sient power surges when its numerous output buffers

transition, particularly when connected to large

capacitive loads.

Low inductance capacitors and interconnects are

recommended for best high frequency electrical

performance. Inductance can be reduced by short-

ening the board traces between the processor and

decoupling capacitors as much as possible. Capaci-

tors specifically designed for PGA packages will offer

the lowest possible inductance.

For reliable operation, always connect unused inputs

to an appropriate signal level. In particular, any

unused interrupt (XINT, NMI), DMA (DREQ), or

BTERM input should be connected to VCC through a

pull-up resistor. Pull-up resistors should be in the in

the range of 20 K

Ω for each pin tied high. If READY

or HOLD are not used, the unused input should be

connected to ground. N.C. pins must always

remain unconnected. For additional information

refer to the

i960® Cx Microprocessor User’s Manual

(270710).

4.4

DC Specifications

Table 14. DC Characteristics (Sheet 1 of 2)

(80960CF-40, 33, -25, -16 under the conditions described in Section 4.2, Operating Conditions.)

Symbol

Parameter

Min

Max

Units

Notes

VIL

Input Low Voltage for all pins except RESET

– 0.3

+0.8

VIH

Input High Voltage for all pins except RESET

2.0

VCC + 0.3

VOL

Output Low Voltage

0.45

IOL = 5 mA

VOH

Output High Voltage

IOH = –1 mA

IOH = – 200 µA

2.4

VCC – 0.5

VILR

Input Low Voltage for RESET

– 0.3

1.5

VIHR

Input High Voltage for RESET

3.5

VCC + 0.3

NOTES:

1. No pullup or pulldown.

2. These pins have internal pullup resistors.

3. These pins have internal pulldown resistors.

4. Measured at worst case frequency, VCC and temperature, with device operating and outputs loaded to the test conditions

described in Section 4.5.1, AC TEST CONDITIONS.

5. ICC Typical is not tested.

6. Output Capacitance is the capacitive load of a floating output.

7. CLKMODE pin has a pulldown resistor only when ONCE pin is deasserted.

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