Table 7.11 Bidirectional Signals—GPIO0_FETCH/, GPIO1_MASTER/

Symbol

Parameter

Min

Max

Unit

Test Conditions

 

 

 

 

 

 

VIH

Input high voltage

2.0

VDD +0.5

V

VIL

Input low voltage

VSS 0.5

0.8

V

VOH

Output high voltage

2.4

VDD

V

16 mA

VOL

Output low voltage

VSS

0.4

V

16 mA

IOH

Output high current

8

mA

2.4 V

IOL

Output low current

16

mA

0.4 V

IIN

Input leakage

10

10

μA

IOZ

3-state leakage

10

10

μA

Note: All the signals in this table have 100 μA pull-ups that are enabled when TESTIN is low.

7.2 TolerANT Technology

The LSI53C810A features TolerANT technology, which includes active negation on the SCSI drivers and input signal filtering on the SCSI receivers. Active negation actively drives the SCSI Request, Acknowledge, Data, and Parity signals HIGH rather than allowing them to be passively pulled up by terminators. Table 7.12 provides electrical characteristics for SE SCSI signals. Figure 7.1 through Figure 7.5 show the effect of TolerANT technology on the DC characteristics of the chip.

7-6

Electrical Characteristics

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LSI 53C810A technical manual TolerANT Technology, Bidirectional Signals-GPIO0FETCH/, GPIO1MASTER