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TolerANT Technology Electrical Characteristics 6-5
6.2 TolerANT Technology Electrical Characteristics
The LSI53C875A 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 6 .11 provides electrical
characteristics for SE SCSI signals. Figure 6.1 through Figure 6.5
provide reference information for testing SCSI signals.
Table 6.9 Output Signals—IRQ/, MAC/_TESTOUT, REQ/
Symbol Parameter Min Max Unit Test Conditions
V
OH
Output high voltage 0.9 V
DD
V
DD
V −16 mA
V
OL
Output low voltage V
SS
0.1 V
DD
V16mA
I
OZ
3-state leakage −10 10 µA–
I
PULL
Pull-down current - only
on IRQ/
−50 −12.5 µA–
Table 6.10 Output Signal—SERR/
Symbol Parameter Min Max Unit Test Conditions
V
OL
Output low voltage V
SS
0.1 V
DD
V16mA
I
OZ
3-state leakage −10 10 µA–