Texas Instruments UCC5620MWP, UCC5620FQPTR, UCC5620FQP, UCC5620MWPTR Datasheet
UCC5620
DESCRIPTION
UCC5620 provides 27 lines of active termination for a SCSI (Small Com
puter Systems Interface) parallel bus. The SCSI standard recommends
active termination at both ends of the cable.
The UCC5620 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 UCC5620 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 UCC5620 to source full ter
mination current and sink active negation current when all termination
lines are actively negated.
The UCC5620, as with all Unitrode terminators, is completely hot plugga
ble and appears as high impedance at the teminating channels with
V
TRMPWR
= 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 QSOP (MWP) and 48-Pin LQFP (FQP).
Consult QSOP-36 or LQFP-48 packaging diagram for exact dimensions.
27-Line SCSI Terminator
BLOCK DIAGRAM
FEATURES
•
Complies with SCSI, SCSI-2, SCSI-3,
SPI and FAST-20 (Ultra) Standards
•
2.5pF Channel Capacitance during
Disconnect
•
100mA 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
SLUS287A - OCTOBER 1999
UDG-96109
Circuit Design Patented
2
UCC5620
Termpwr 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
Currents are positive into, negative out of the specified termi
-
nal. Consult Packaging Section of Databook for thermal limita
-
tions and considerations of packages.
ABSOLUTE MAXIMUM RATINGS
DISCNCT
GND
LINE21
LINE20
LINE19
LINE7
LINE23
LINE9
GND
LINE27
GND
LINE24
LINE25
LINE26
LINE8
GND
LINE10
REG
GND
GND
LINE11
LINE12
14
13
12
11
10
9
8
7
6
5
4
3
2
1
23
24
25
26
27
28
29
30
31
32
33
34
35
36
18
17
16
15
LINE15
LINE3
LINE4
19
20
21
22LINE13
LINE14
LINE1
LINE2
TRMPWR
LINE18
LINE17
LINE16
LINE22
LINE5
LINE6
CONNECTION DIAGRAM
SSOP-36 (Top View)
MWP Package
ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for T
A
= 0°C to 70°C, TRMPWR
= 4.75V, DISCNCT = 0V, T
A=TJ
.
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
Supply Current Section
TRMPWR Supply Current All Termination Lines = Open 1 2 mA
All Termination Lines = 0.2V 630 650 mA
Power Down Mode DISCNCT = TRMPWR 100 200 µA
48
47
46
45
1
44
43
424140
393837
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
192021
22
23
24
36
35
34
33
32
31
30
29
28
27
26
25
LINE 22
LINE 5
LINE 6
LINE 7
LINE 8
HS/GND
N/C
LINE 24
LINE 9
HS/GND
HS/GND
REG
LINE 19
LINE 20
LINE 21
TRMPWR
HS/GND
LINE 17
LINE 18
LINE 16
LINE 4
LINE 15
LINE 2
LINE 3
N/C
LINE 12
LINE 13
LINE 14
HS/GND
LINE 27
LINE 26
LINE 25
DISCNCT1
HS/GND
LINE 10
N/C
LINE 11
HS/GND
HS/GND
HS/GND
LINE 23
HS/GND
HS/GND
LINE 1
HS/GNDHS/GND
HS/GND
N/C
LFQP-48 (Top View)
FQP Package
Loading...