80960KB 查看數據表（PDF） - Intel

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80960KB

EMBEDDED 32-BIT MICROPROCESSOR WITH INTEGRATED FLOATING-POINT UNIT

Intel 

80960KB

of a matched diode bridge. Since the open-drain

outputs sink current, only the IOL legs of the bridge

are necessary and the IOH legs are not used. When

the 80960KB driver under test is turned off, the

output pin is pulled up to VREF (i.e., VOH). Diode D1

is turned off and the IOL current source flows through

diode D2.

When the 80960KB open-drain driver under test is

on, diode D1 is also on and the voltage on the pin

being tested drops to VOL. Diode D2 turns off and IOL

flows through diode D1.

THREE-STATE OUTPUT

CL

CL = 50 pF for all signals

Figure 12. Test Load Circuit for Three-State

Output Pins

OPEN-DRAIN OUTPUT

D1

IOL

D2

CL

CL = 50 pF for all signals

IOL Tested at 25 mA

VREF = VCC

D1 and D2 are matched

Figure 13. Test Load Circuit for Open-Drain

Output Pins

14

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