ETC UCC5619MWP

UCC5619
27-Line SCSI Terminator With Reverse Disconnect
FEATURES
DESCRIPTION
• Complies with SCSI, SCSI-2, SCSI-3,
SPI and FAST-20 (Ultra) Standards
UCC5619 provides 27 lines of active termination for a SCSI (Small Computer Systems Interface) parallel bus. The SCSI standard recommends active termination at both ends of the cable.
• 2.5pF Channel Capacitance during
Disconnect
• 100µA Supply Current in Disconnect
Mode
• 4V To 7V Operation
• 110
Termination
• Completely Meets SCSI Hot Plugging
• –900mA Sourcing Current for
Termination
• +500mA Sinking Current for Active
Negation
• Logic Command Disconnects all
Termination Lines
• Trimmed Impedance to 5%
• Current Limit and Thermal Shutdown
Protection
BLOCK DIAGRAM
The UCC5619 is ideal for high performance 5V SCSI systems. During disconnect the supply current is typically only 100µA, which makes the IC attractive for lower powered systems.
The UCC5619 is designed with a low channel capacitance of 2.5pF, which
eliminates effects on signal integrity from disconnected terminators at interim points on the bus.
The power amplifier output stage allows the UCC5619 to source full termination current and sink active negation current when all termination lines
are actively negated.
The UCC5619, as with all Unitrode terminators, is completely hot pluggable
and appears as high impedance at the teminating channels with VTRMPWR
= 0V or open.
Internal circuit trimming is utilized, first to trim the 110Ω impedance, and
then most importantly, to trim the output current as close to the maximum
SCSI-3 specification as possible, which maximizes noise margin in fast
SCSI operation.
Other features include thermal shutdown and current limit. This device is
offered in low thermal resistance versions of the industry standard 36 pin
wide body QSSOP (MWP) and 48 pin LQFP (FQP).
Consult SSOP-36 (MWP QSSOP-36) and FQP-48 Packaging Diagram for
exact dimensions.
Circuit Design Patented
10/98
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UDG-96108
UCC5619
CONNECTION DIAGRAM
ABSOLUTE MAXIMUM RATINGS
TRMPWR Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7V
Signal Line Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . 0V to +7V
Regulator Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5A
Storage Temperature . . . . . . . . . . . . . . . . . . . −65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . −55°C to +150°C
Lead Temperature (Soldering, 10 Sec.). . . . . . . . . . . . . +300°C
LFQP-48 (Top View)
FQP Package
HS/GND
LINE 8
LINE 7
LINE 6
LINE 5
LINE 22
HS/GND
HS/GND
LINE 9
LINE 23
Currents are positive into, negative out of the specified terminal. Consult Packaging Section of Databook for thermal limitations and considerations of packages.
LINE 24
N/C
48 47
QSSOP-36 (Top View)
MWP Package
46
38
40 39
1
37
36
LINE 21
LINE 25
2
35
LINE 20
LINE 26
3
34
LINE 19
LINE 27
4
33
REG
45
44 43
42
N/C
41
LINE8
1
36
LINE7
HS/GND
5
32
HS/GND
LINE9
2
35
LINE6
HS/GND
6
31
HS/GND
HS/GND
7
30
HS/GND
HS/GND
8
29
HS/GND
N/C
9
28
TRMPWR
LINE23
LINE24
3
4
34
33
LINE5
LINE22
LINE25
5
32
LINE21
DISCNCT1
10
27
LINE 18
LINE26
6
31
LINE20
LINE 10
11
26
LINE 17
LINE27
7
30
LINE19
LINE 11
12
13 14
25
LINE 16
GND*
8
29
REG
GND*
9
28
GND*
N/C
LINE 12
LINE 15
LINE 4
GND*
10
27
GND*
11
26
GND*
LINE10
12
25
TRMPWR
LINE 13
LINE 14
HS/GND
HS/GND
LINE 3
LINE 2
DISCNCT
LINE11
13
24
LINE18
LINE12
14
23
LINE17
LINE13
15
22
LINE16
LINE14
16
21
LINE15
LINE1
17
20
LINE4
LINE2
18
19
LINE3
15
16
17 18
19
20
21 22
23
24
LINE 1
HS/GND
* MWP package pins 8 - 10 and 26 - 28 serve as heatsink/
ground.
ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for TA = 0°C to 70°C,
TRMPWR = 4.75V, DISCNCT = 4.75V, TA = TJ.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Supply Current Section
TRMPWR Supply Current
Power Down Mode
All Termination Lines = Open
1
2
mA
All Termination Lines = 0.2V
630
650
mA
DISCNCT = 0V
100
200
µA
Output Section (Termination Lines)
Termination Impedance
(Note 3)
104.5
110
115.5
Ω
Output High Voltage
(Note 1)
2.6
2.8
3.0
V
VLINE = 0.2V, TJ = 25°C
−22.1
−23.3
−24
mA
VLINE = 0.2V
−20.7
−23.3
−24
mA
VLINE = 0.2V, TRMPWR = 4V, TJ = 25°C (Note 1)
−21
−23
−24
mA
VLINE = 0.2V, TRMPWR = 4V (Note 1)
−20
−23
−24
mA
Max Output Current
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2
UCC5619
ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for TA = 0°C to 70°C,
TRMPWR = 4.75V, DISCNCT = 4.75V, TA = TJ.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Output Section (CONT.)
22.4
mA
Output Leakage
VLINE = 0.5V
DISCNCT = 0V, TRMPWR = 0V to 5.25V
10
400
nA
Output Capacitance
DISCNCT = 0V (Note 2)
2.5
4
pF
2.8
3.0
V
0.4
0.8
V
Regulator Section
Regulator Output Voltage
2.6
Drop Out Voltage
All Termination Lines = 0.2V
Short Circuit Current
VREG = 0V
−650
−900
–1300
mA
Sinking Current Capability
VREG = 3.5V
300
500
900
mA
Thermal Shutdown
170
°C
Thermal Shutdown Hysteresis
10
°C
Disconnect Section
Disconnect Threshold
0.8
DISCNCT = 0V
Input Current
1.5
2.0
V
–20
–60
µA
PIN DESCRIPTIONS
DISCNCT: Taking this pin low causes all channels to
become high impedance, and the chip to go into
low-power mode; a high state or leaving it open allows
the channels to provide normal termination.
LINE1 - LINE27: 110Ω termination channels.
REG: Output of the internal 2.7V regulator; bypass with a
4.7 F capacitor to GND.
TRMPWR: Power for the IC; bypass with a 4.7 F
capacitor to GND.
GND: Ground reference for the IC.
UCC5619
11
DISCNCT
TERMPWR
25
REG
29
TERMPWR
4.7µF
LINE1
LINE27
17
7
DATA BYTES
1 AND 2
+2 PARITY BITS
4.7µF
CONTROL
BYTES
TO DRIVERS
AND
RECEIVERS
TO SCSI BUS
Figure 1. Typical wide SCSI bus configuration using the UCC5619
UNITRODE CORPORATION
7 CONTINENTAL BLVD. • MERRIMACK, NH 03054
TEL. (603) 424-2410 FAX (603) 424-3460
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UDG-98072
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