Avago Technologies LSI53C140 - Manual (Page 51)

Electrical Characteristics 3-17
Ver. 2.1 Copyright © 1998–2001 by LSI Logic Corporation. All rights reserved.
3.2.2 TolerANT Technology Electrical Characteristics
The LSI53C140 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 3.15 provides electrical
characteristics for SE SCSI signals. Figures 3.7 through 3.11 provide
reference information for testing SCSI signals.
Table 3.15 TolerANT Technology Electrical Characteristics
1
Symbol Parameter Min Max Units Test Conditions
V
OH
2
Output high voltage 2.0 V
DD
+0.3 V I
OH
=
−
7 mA
V
OL
Output low voltage V
SS
0.5 V I
OL
= 48 mA
V
IH
Input high voltage 2.0 V
DD
+0.3 V –
V
IL
Input low voltage V
SS
–0.3 0.8 V Referenced to V
SS
V
IK
Input clamp voltage –0.66 –0.77 V V
DD
= 4.75;
I
I
=
−
20 mA
V
TH
Threshold, HIGH to LOW 1.0 1.2 V –
V
TL
Threshold, LOW to HIGH 1.4 1.6 V –
V
TH
–V
TL
Hysteresis 300 500 mV –
I
OH
2
Output high current 2.5 24 mA V
OH
= 2.5 V
I
OL
Output low current 100 200 mA V
OL
= 0.5 V
I
OSH
2
Short-circuit output high
current – 625 mA Output driving low,
pin shorted to V
DD
supply
3
I
OSL
Short-circuit output low
current – 95 mA Output driving high,
pin shorted to V
SS
supply
I
LH
Input high leakage – 20
µ
A V
DD
5%,
V
PIN
= 2.7 V
(Sheet 1 of 2)