Avago Technologies LSI8751D - Manual (Page 243)

TolerANT Technology Electrical Characteristics 7-7
7.2 TolerANT Technology Electrical Characteristics
The LSI53C875 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 7.15 provides electrical
characteristics for SE SCSI signals. Figure 7.1 through Figure 7.5
provide reference information for testing SCSI signals.
Table 7.15 TolerANT Technology Electrical Characteristics
Symbol Parameter Min Max Unit Test Conditions
V
OH
1
Output high voltage 2.5 3.5 V I
OH
= 2.5 mA
V
OL
Output low voltage 0.1 0.5 V I
OL
= 48 mA
V
IH
Input high voltage 2.0 7.0 V –
V
IL
Input low voltage
−
0.5 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 1.1 1.3 V –
V
TL
Threshold, LOW to HIGH 1.5 1.7 V –
V
TH
–V
TL
Hysteresis 200 400 mV –
I
OH
1
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
1
Short-circuit output high current – 625 mA Output driving low, pin
shorted to V
DD
supply
2
I
OSL
Short-circuit output low current – 95 mA Output driving high, pin
shorted to V
SS
supply
I
LH
Input high leakage – 10
µ
A
−
0.5 < V
DD
< 5.25
V
PIN
= 2.7 V
I
LL
Input low leakage –
−
10
µ
A
−
0.5 < V
DD
< 5.25
V
PIN
= 0.5 V
R
I
Input resistance 20 – M
Ω
SCSI pins
3
C
P
Capacitance per pin – 10 pF PQFP
t
R
1
Rise time, 10% to 90% 9.7 18.5 ns Figure 7.1
t
F
Fall time, 90% to 10% 5.2 14.7 ns Figure 7.1
dV
H
/dt Slew rate, LOW to HIGH 0.15 0.49 V/ns Figure 7.1
dV
L
/dt Slew rate, HIGH to LOW 0.19 0.67 V/ns Figure 7.1