Avago Technologies LSI53C1020 - Manual (Page 127)

TolerANT Technology Electrical Characteristics 5-7
Version 2.4 Copyright © 2001–2004 by LSI Logic Corporation. All rights reserved.
5.2 TolerANT Technology Electrical Characteristics
The LSI53C1020 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 5.12 provides electrical characteristics for SE SCSI signals.
Figures 5.3 and 5.4 provide the reference information for testing SCSI
signals.
Table 5.12 TolerANT Technology Electrical Characteristics for SE SCSI
Signals
1
Symbol Parameter Min Max Unit Test Conditions
V
OH
2
Output high voltage 2.5 3.7 V I
OH
= 0 mA
V
OL
Output low voltage 0.0 0.5 V I
OL
= 48 mA
V
IH
Input high voltage 1.9 5.50 V Signal FALSE state
V
IL
Input low voltage
−
0.5 1.0 V Referenced to V
SS
Signal TRUE state
V
IK
Input clamp voltage –
−
0.75 V V
pp
= Min;
I
1
=
−
20 mA
V
TH
Threshold, HIGH to LOW 1.00 – V –
V
TL
Threshold, LOW to HIGH – 1.90 V –
V
TH
–V
TL
Hysteresis 375 – mV –
I
ih.hp
Hot plug high level current peak – 1.5 mA Transient duration of
10% of peak equals
20
µ
s. This applies
during physical
insertion only.
I
OH2
Output high current 0 7 mA V
OH
= 2.2 V
I
OL
Output low current 48 – mA V
OL
= 0.5 V
I
OSH2
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
DD
<5.25
V
PIN
= 2.7 V