Key Features
x
Ultra-Fast response for Fast-20 SCSI applications
x
Hot swap compatible
x
35MHz channel bandwidth
x
3.5V operation
x
Less than 3pF output capacitance
x
Sleep-mode current less than 375µA
x
Thermally self limiting
x
No external compensation capacitors
x
Implements 8-bit or 16-bit (wide) applications
x
Compatible with active negation drivers
(60ma/channel)
x
Compatible with passive and active terminations
x
Approved for use with SCSI 1, 2, 3 and UltraSCSI
Block Diagrams
+
Current
Biasing
Circuit
Thermal
Limiting
Circuit
24mA Current
Limiting Circuit
Term Power
DATA OUTPUT
PIN DB (0)
1 of 9 Channels
Disable Pin
1.4V
2.85V
5219_01.eps
9-Line SCSI T
9-Line SCSI T
er
er
minat
minat
or
or
The 9-channel IMP5219 SCSI terminator is part of IMP's family of high-
performance SCSI terminators that deliver true UltraSCSI performance.
The BiCMOS design offers superior performance over first generation
linear regulator/resistor based terminators.
IMP's new architecture employs high-speed adaptive elements for each
channel, thereby providing the fastest response possible - typically
35MHz, which is 100 times faster than the older linear regulator termi-
nator approach. The bandwidth of terminators based on the older
regulator/resistor terminator architecture is limited to 500kHz since a
large output stabilization capacitor is required. The IMP architecture
eliminates the external output compensation capacitor and the need
for transient output capacitors while maintaining pin compatibility
with first generation designs. Reduced component count is inherent
with the IMP5219.
The IMP5219 architecture tolerates marginal system designs. A key
improvement offered by the IMP5219 lies in its ability to insure reliable,
error-free communications even in systems which do not adhere to rec-
ommended SCSI hardware design guidelines, such as improper cable
lengths and impedance. Frequently, this situation is not controlled by the
peripheral or host designer.
For portable and configurable peripherals, the IMP5219 can be placed in
a sleep mode with an active LOW disable signal. Quiescent current is
typically 375
µ
A and output are in a high impedance state when disabled.
IMP5
IMP5
1
1
1
1
1/5
1/5
1
1
1
1
2
2
D
ATA
C
OMMUNICATIONS
IMP52
IMP52
1
1
9
9
D
ATA
C
OMMUNICATIONS
© 2000 IMP, Inc.
Data Communications 1
2
408-432-9100/www.impweb.com
© 2000 IMP, Inc.
Pin Configuration
Ordering Information
Absolute Maximum Ratings
1
8
GND
1
TERM POWER
DW Package
9
GND
7
D4
10 D5
6
D3
11 D6
5
D2
12 D7
4
D1
13 D8
3
D0
14 DISABLE
2
NC
15 NC
16 TERM POWER
5219_02.eps
IMP5219
SOWB-16
10
GND
1
TERM POWER
PW Package
11 GND
7
D3
14 D6
8
D4
13 D5
9
NC
12 NC
6
D2
15 NC
5
D1
16 D7
4
D0
17 D8
3
NC
18 NC
2
NC
19 DISABLE
20 TERM POWER
5219_02a.eps
IMP5219
TSSOP-20
r
e
b
m
u
N
t
r
a
P
e
g
n
a
R
e
r
u
t
a
r
e
p
m
e
T
e
g
a
k
c
a
P
W
D
C
9
1
2
5
P
M
I
0°
5
2
1
o
t
C
°C
B
W
O
S
c
i
t
s
a
l
P
n
i
p
-
6
1
T
W
D
C
9
1
2
5
P
M
I
0°
5
2
1
o
t
C
°C
B
W
O
S
c
i
t
s
a
l
P
n
i
p
-
6
1
,
l
e
e
R
d
n
a
e
p
a
T
W
P
C
9
1
2
5
P
M
I
0°
5
2
1
o
t
C
°C
P
O
S
S
T
c
i
t
s
a
l
P
n
i
p
-
0
2
T
W
P
C
9
1
2
5
P
M
I
0°
5
2
1
o
t
C
°C
P
O
S
S
T
c
i
t
s
a
l
P
n
i
p
-
0
2
,
l
e
e
R
d
n
a
e
p
a
T
3
t
a
.
1
0
t
_
9
1
2
5
Thermal Data
Continuous Termination Voltage . . . . . . . . . . . 10V
Continuous Output Voltage Range . . . . . . . . 0V to 5.5V
Continuous Disable Voltage Range . . . . . . . . 0V to 5.5V
Operating Junction Temperature . . . . . . . . . . 0
°
C to 125
°
C
Storage Temperature Range . . . . . . . . . . . . . . 65
°
C to 150
°
C
Lead Temperature (Soldering, 10 sec.) . . . . . . 300
°
C
Note:
1. Exceeding these ratings could cause damage to the device. All
voltages are with respect to Ground. Currents are positive
into, negative out of the specified terminal.
DW Package:
Thermal Resistance Junction-to-Ambient,
JA
. . . . . . 95
°
C/W
PW Package:
Thermal Resistance Junction-to-Ambient,
JA
. . . . . . 144
°
C/W
Junction Temperature Calculation: T
J
= T
A
+ (P
D
x
JA
).
The
JA
numbers are guidelines for the thermal performance of the
device/pc-board system. All of the ambient airflow is assumed.
IMP5
IMP5
1
1
1
1
1/5
1/5
1
1
1
1
2
2
IMP52
IMP52
1
1
9
9
© 2000 IMP, Inc.
Data Communications
3
Recommended Operating Conditions
2
r
e
t
e
m
a
r
a
P
l
o
b
m
y
S
n
i
M
p
y
T
x
a
M
s
t
i
n
U
e
g
a
t
l
o
V
r
w
p
m
r
e
T
V
M
R
E
T
5
.
3
5
.
5
V
e
g
a
t
l
o
V
t
u
p
n
I
e
l
b
a
s
i
D
l
e
v
e
L
h
g
i
H
V
H
I
2
V
M
R
E
T
V
e
g
a
t
l
o
V
t
u
p
n
I
e
l
b
a
s
i
D
l
e
v
e
L
w
o
L
V
L
I
0
8
.
0
V
e
g
n
a
R
e
r
u
t
a
r
e
p
m
e
T
n
o
i
t
c
n
u
J
g
n
i
t
a
r
e
p
O
0
5
2
1
C
°
.
l
a
n
o
i
t
c
n
u
f
s
i
e
c
i
v
e
d
e
h
t
h
c
i
h
w
r
e
v
o
e
g
n
a
r
e
h
t
e
t
a
c
i
d
n
i
s
n
o
i
t
i
d
n
o
c
g
n
i
t
a
r
e
p
o
d
e
d
n
e
m
m
o
c
e
R
.
2
:
e
t
o
N
s
p
e
.
2
0
t
_
9
1
2
5
Electrical Characteristics
Unless otherwise specified, these specifications apply at an ambient operating temperature of T
A
=
25
°
C. TermPwr = 4.75V. Low duty cycle
pulse testing techniques are used which maintain junction and case temperatures equal to the ambient temperature.
r
e
t
e
m
a
r
a
P
l
o
b
m
y
S
s
n
o
i
t
i
d
n
o
C
n
i
M
p
y
T
x
a
M
s
t
i
n
U
e
g
a
t
l
o
V
h
g
i
H
t
u
p
t
u
O
V
T
U
O
5
6
.
2
5
8
.
2
V
t
n
e
r
r
u
C
y
l
p
p
u
S
r
w
P
m
r
e
T
I
C
C
n
e
p
O
=
s
e
n
il
a
t
a
d
ll
A
6
9
A
m
V
5
.
0
=
s
e
n
il
a
t
a
d
ll
A
5
1
2
5
2
2
A
m
V
8
.
0
<
e
l
b
a
s
i
D
5
7
3
µ
A
t
n
e
r
r
u
C
t
u
p
t
u
O
I
T
U
O
V
T
U
O
V
5
.
0
=
1
2
3
2
4
2
A
m
t
n
e
r
r
u
C
t
u
p
n
I
e
l
b
a
s
i
D
I
N
I
V
5
7
.
4
=
e
l
b
a
s
i
D
0
1
A
n
V
0
=
e
l
b
a
s
i
D
0
9
µ
A
t
n
e
r
r
u
C
e
g
a
k
a
e
L
t
u
p
t
u
O
I
L
O
V
,
V
8
.
0
=
e
l
b
a
s
i
D
O
V
5
.
0
=
0
1
A
n
e
d
o
M
d
e
l
b
a
s
i
D
n
i
e
c
n
a
t
i
c
a
p
a
C
C
T
U
O
V
T
U
O
z
H
M
1
=
y
c
n
e
u
q
e
r
F
,
V
0
=
3
F
p
h
t
d
i
w
d
n
a
B
l
e
n
n
a
h
C
W
B
5
3
z
H
M
l
e
n
n
a
h
C
r
e
p
,
t
n
e
r
r
u
C
k
n
i
S
n
o
i
t
a
n
i
m
r
e
T
I
K
N
I
S
V
T
U
O
V
4
=
0
6
A
m
s
p
e
.
3
0
t
_
9
1
2
5
IMP5
IMP5
1
1
1
1
1/5
1/5
1
1
1
1
2
2
IMP52
IMP52
1
1
9
9
4
408-432-9100/www.impweb.com
© 2000 IMP, Inc.
Application Information
IMP5219 Maximizes Line Current
Cable transmission theory suggests to optimize signal speed and
quality, the termination should act both as an ideal voltage refer-
ence when the line is released (deasserted) and as an ideal
current source when the line is active (asserted). Common active
terminators which consist of linear regulators in series with resis-
tors (typically 110
) are a compromise. With coventional linear
terminators as the line voltage increases the amount of current
decreases linearly by the equation;
The IMP5219, with its unique new architecture, applies the maxi-
mum amount of current regardless of line voltage until the
termination high threshold (2.85V) is reached.
Acting as a near ideal line terminator, the IMP5219 closely repro-
duces the optimum case when the device is enabled. To enable the
device the Disable pin must be driven HIGH or left Open. When
enabled, quiescent current is 6mA and the device will respond to
line demands by delivering 24mA on assertion and by imposing
2.85V on de-assertion.
Disable/Sleep Mode
Disable mode places the device in a sleep state, where quiescent
current typically 375
µ
A. When disabled, all outputs are in a high
impedance state and output capacitance is a low 3pF. Sleep mode
can be used for power conservation or to remove the terminator
from the SCSI chain.
An additional feature of the IMP5219 is its compatibility with
active negation drivers.
Table 1. Power Up/ Power Down Function Table
e
l
b
a
s
i
D
s
t
u
p
t
u
O
t
n
e
r
r
u
C
t
n
e
c
s
e
i
u
Q
H
d
e
l
b
a
n
E
A
m
6
L
h
g
i
H
/
e
l
b
a
s
i
D
e
c
n
a
d
e
p
m
I
5
7
3
µ
A
n
e
p
O
d
e
l
b
a
n
E
A
m
6
s
p
e
.
4
0
t
_
9
1
2
5
V
V
R
I
REF
LINE
-
(
)
=
.
Figure 3.
5219_03.eps
1 Meter, AWG 28
IMP5219
Receiver
Driver
IMP5219
Figure 1. Receiving Waveform 20MHz
Figure 2. Driving Waveform 20MHz
IMP5
IMP5
1
1
1
1
1/5
1/5
1
1
1
1
2
2
IMP52
IMP52
1
1
9
9
© 2000 IMP, Inc.
Data Communications
5
Typical Characteristics
Line Voltage (V)
Time (250ns/Div.)
5219_04.eps
0.5
GND
0.5
1.5
2.5
1.0
2.0
3.5
3.0
Frequency = 1.03844MHz
Line Voltage (V)
Time (250ns/Div.)
5219_05.eps
0.5
GND
0.5
1.5
2.5
1.0
2.0
3.5
3.0
Frequency = 1.00266MHz
Figure 4. Receiving Waveform
Figure 5. Driving Waveform
5219_06.eps
6 Meter, 92
75C08
75C08
Figure 4
Figure 5
IMP5219
Receiver
Driver
IMP5219
Figure 6. End-Driven Cable
IMP5
IMP5
1
1
1
1
1/5
1/5
1
1
1
1
2
2
IMP52
IMP52
1
1
9
9
6
408-432-9100/www.impweb.com
© 2000 IMP, Inc.
Line Voltage (V)
Time (50ns/Div.)
5219_07.eps
0.5
GND
0.5
1.5
2.5
1.0
2.0
3.5
3.0
Frequency = 5.0092MHz
Line Voltage (V)
Time (50ns/Div.)
5219_08.eps
0.5
GND
0.5
1.5
2.5
1.0
2.0
3.5
3.0
Frequency = 4.9961MHz
Figure 7. Receiving Waveform
Figure 8. Driving Waveform
5219_09.eps
6 Meter, 92
75C08
75C08
Figure 7
Figure 8
IMP5219
Receiver
Driver
IMP5219
Figure 9. End-Driven Cable
Line Voltage (V)
Time (20ns/Div.)
5219_10.eps
GND
2
0
2
4
1
4
3
Ch2 Frequency = 10.096MHz
#3
#1
#2
Line Voltage (V)
Time (10ns/Div.)
5219_11.eps
GND
2
0
2
4
1
4
3
Ch2 Frequency = 20.020MHz
#3
#1
#2
Figure 10. 10MHz Waveform
Figure 11. 20MHz Waveform
5219_12.eps
6 Meter, 72
4.75V
#1
#3
#2
4.75V
IMP5219
IMP5219
Figure 12. End-Driven Cable
Typical Characteristics
IMP5
IMP5
1
1
1
1
1/5
1/5
1
1
1
1
2
2
IMP52
IMP52
1
1
9
9
© 2000 IMP, Inc.
Data Communications
7
Output High Voltage (V)
Junction Temperature (
°
C)
5219_13.eps
0
25
50
75
100
125
2.0
2.5
3.0
3.5
4.0
4.5
Output Current (mA)
Junction Temperature (
°
C)
5219_14.eps
0
25
50
75
100
125
5
10
15
20
25
30
V
T
= 4.75V
Figure 13. Output High Voltage vs. Junction Temperature
Figure 14. Output Current vs. Junction Temperature
TermPwr Supply Current (mA)
Termination Voltage (V)
5219_17.eps
2.5
3.0
3.5
4.5
5.5
4.0
5.0
6.0
0
1
2
3
5
4
6
7
TermPwr Supply Current (
µ
A)
Termination Voltage (V)
5219_18.eps
0
1
2
4
3
5
6
0
50
100
250
150
400
200
300
500
350
450
Figure 17. TermPwr Supply Current
vs. Termination Voltage
Figure 18. TermPwr Supply Current
vs. Termination Voltage (Disabled)
Output Current (mA)
Output High Voltage (V)
5219_15.eps
0
0.4
1.2
2.0
0.8
1.6
2.4
2.8
3.2
0
5
10
15
20
25
V
T
= 4.75V
V
A
= 25
°
C
Output Current (mA)
Output High Voltage (V)
5219_16.eps
0
0.4
1.2
2.0
0.8
1.6
2.4
2.8
3.2
0
5
10
15
20
25
V
T
= 3.3V
V
A
= 25
°
C
Figure 15. Output Current vs. Output High Voltage
Figure 16. Output Current vs. Output High Voltage
Typical Characteristics
IMP5
IMP5
1
1
1
1
1/5
1/5
1
1
1
1
2
2
IMP52
IMP52
1
1
9
9
8
408-432-9100/www.impweb.com
© 2000 IMP, Inc.
Output High Voltage (V)
Junction Temperature (
°
C)
5218_19.eps
V
T
= 3.3V
0
25
50
75
100
125
2.0
2.5
3.0
3.5
4.0
4.5
Output Current (mA)
Junction Temperature (
°
C)
5218_20.eps
V
T
= 3.3V
0
25
50
75
100
125
5
10
15
20
25
30
Figure 19. Output High Voltage vs. Junction Temperature
Figure 20. Output Current vs. Junction Temperature
Typical Characteristics
Output High Voltage (V)
V
TERM
Voltage (V)
5218_21.eps
3.0
3.5
4.0
5.0
4.5
5.5
6.0
0
0.5
1.0
1.5
2.5
2.0
3.5
3.0
4.0
Output High Voltage (V)
V
TERM
Voltage (V)
5218_22.eps
3.0
3.5
4.0
5.0
4.5
5.5
6.0
0
5
10
15
20
25
Figure 21. Output High Voltage vs. Termination Voltage
Figure 22. Output Current vs. Termination Voltage
IMP5
IMP5
1
1
1
1
1/5
1/5
1
1
1
1
2
2
IMP52
IMP52
1
1
9
9
ATN
BSY
ACK
RST
MSG
~
~
~
~
~
TERM POWER
~
~
~
~
~
DB (P)
DB (7)
DB (6)
DB (1)
DB (0)
5V
DISCONNECT
IMP5219
SCSI CABLE
Note: Add third IMP5219 for 16-bit SCSI
TERMPWR
HOST
PERIPHERAL
V
TERM
2.2
µ
F
5V
TERM POWER
ATN
BSY
ACK
RST
MSG
DB (P)
DB (7)
DB (6)
DB (1)
DB (0)
V
TERM
V
TERM
V
TERM
TERMPWR
2.2
µ
F
DISCONNECT
DISCONNECT
DISCONNECT
TERMPWR
TERMPWR
IMP5219
IMP5219
IMP5219
© 2000 IMP, Inc.
Data Communications
9
Figure 23. Output Current Matching Channel to Channel
Typical Characteristics
1
2
3
4
5
6
7
8
9 10 11
12 13 14
15 16 17
18 19 20
21 22 23
24 25
i0
i2
i4
i6
i8
21
21.5
22
22.5
23
23.5
24
Io (mA)
Part #
Channel
23.5 24
23 23.5
22.5 23
22 22.5
21.5 22
21 21.5
Figure 24. 8-Bit SCSI System Application
IMP5
IMP5
1
1
1
1
1/5
1/5
1
1
1
1
2
2
IMP52
IMP52
1
1
9
9
© 2000 IMP, Inc.
Printed in USA
Publication #: 7012
Revision: D
Issue Date:
07/31/00
Type:
Preliminary
s
e
h
c
n
I
s
r
e
t
e
m
i
ll
i
M
n
i
M
x
a
M
n
i
M
x
a
M
)
n
i
P
-
6
1
(
B
W
O
S
A
3
9
0
.
0
4
0
1
.
0
5
3
.
2
5
6
.
2
1
A
4
0
0
.
0
2
1
0
.
0
0
1
.
0
0
3
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IMP, Inc.
Corporate Headquarters
2830 N. First Street
San Jose, CA 95134-2071
Tel: 408-432-9100
Fax: 408-43
2-1085
e-mail: info@impinc.com
http://www.impweb.com
The IMP logo is a registered trademark of IMP, Inc.
All other company and product names are trademarks of their respective owners.
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