LSI LSI53C1000, Technical Manual

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TolerANT Technology Electrical Characteristics 6-7
6.2 TolerANT Technology Electrical Characteristics
The LSI53C1000 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 6.13 provides electrical
characteristics for SE SCSI signals. Figures 6.3 through 6.7 provide
reference information for testing SCSI signals.
Table 6.13 TolerANT Technology Electrical Characteristics for SE SCSI Signals
1
Symbol Parameter Min Max Units Test Conditions
V
OH
2
Output high voltage 2.2 3.7 V I
OH
= 7 mA
V
OL
Output low voltage 0.0 0.5 V I
OL
= 48 mA
V
IH
Input high voltage 2.0 – V –
V
IL
Input low voltage – 0.8 V Referenced to V
SS
V
IK
Input clamp voltage
−
0.66
−
0.77 V V
pp
= 4.75 V;
I
1
=
−
20 mA
V
TH
Threshold, HIGH to LOW 1.15 1.25 V –
V
TL
Threshold, LOW to HIGH 1.55 1.65 V –
V
TH
-V
TL
Hysteresis 300 500 mV –
I
OH
2
Output high current 0 7 mA V
OH
= 2.2 V
I
OL
Output low current 48 – mA V
OL
= 0.5 V
I
OSH
2
Short-circuit output high
current 48 – mA Short to V
DD
3
I
OSL
Short-circuit output low
current 22 – mA Short to V
SS
I
LH
Input high leakage – 20
µ
A
−
0.5<V
DD
<5.25
V
PIN
= 2.7 V
I
LL
Input low leakage – 20
µ
A
−
0.5<V
DD
<5.25
V
PIN
= 0.5 V
R
I
Input resistance 20 – M
Ω
SCSI pins