Texas Instruments UCC5640PWXTR, UCC5640PWX, UCC5640PW28TR, UCC5640PW24TR, UCC5640PW28 Datasheet
...
UCC5640
SLUS314A - JANUARY 2000
FEATURES
•
First LVD only Active Terminator
•
Meets SCSI SPI-2 Ultra2 (Fast-40)
and Ultra3 / Ultra160 (Fast-80)
Standards
•
2.7V to 5.25V Operation
•
Differential Failsafe Bias
Low Voltage Differential (LVD) SCSI 9 Line Terminator
REF 1.25V
15DISCNCT
27 LVD*
1
REG
11
DIFFB
4
L1–
3
L1+
26 L9–
25 L9+
56mV
SOURCE/SINK REGULATOR
REF 1.3V
1.3V ± 0.1V
0.7V > 0.5V
2.4V > 1.9V
HIGH IMPEDANCE RECEIVER
EVEN WITH POWER OFF
SINGLE
ENDED
HIGH POWER
DIFFERENTIAL
12
DIFSENS
SOURCE 5–15mA
SINK 200µA MAXIMUM (NOISE LOAD)
OPEN CIRCUIT ON POWER OFF
OR OPEN CIRCUIT IN A
DISABLED TERMINATOR MODE
10µA
28TRMPWR
LOW
FREQUENCY
FILTER
50Hz – 60Hz
20k
124
124
52
52
52
52
4.7µF
0.1µF
14
GND
SOURCE ONLY FROM TRMPWR AND THE ENABLED TERMINATIONS
2.7V to 5.25V
56mV
+–
–+
56mV
+–
56mV
–+
BLOCK DIAGRAM
UDG-98181
DESCRIPTION
The UCC5640 is an active terminator for Low Voltage Differential (LVD)
SCSI networks. This LVD only design allows the user to reach peak bus
performance while reducing system cost. The device is designed as an
active Y-terminator to improve the frequency response of the LVD Bus.
Designed with a 1.5pF channel capacitance, the UCC5640 allows for mini
mal bus loading for a maximum number of peripherals. With the
UCC5640, the designer will be able to comply with the Fast-40 SPI-2 and
Fast-80 SPI-3 specifications. The UCC5640 also provides a much-needed
system migration path for ever improving SCSI system standards. This de
vice is available in the 24 pin TSSOP and 28 pin TSSOP for ease of lay
out use.
The UCC5640 is not designed for use in single ended or high voltage dif
ferential systems.
* 28 pin package only
2
UCC5640
ABSOLUTE MAXIMUM RATINGS
TERMPWR Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +6V
Signal Line Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . 0V to 3.6V
Package Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1W
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 terminal.
consult Packaging Section of Databook for thermal limitations
and considerations of package.
RECOMMENDED OPERATING CONDITIONS
TERMPWR Voltage . . . . . . . . . . . . . . . . . . . . . . . 2.7V to 5.25V
DIFFB
L6+
L8–
L8+
L7–
TRMPWR
L1+
L4–
L3+
L4+
L1–
L2+
L2–
REG
L3–
DIFSENS
L7+
L6–
L5–
12
11
10
9
8
7
6
5
4
3
2
1
13
14
15
16
17
18
19
20
21
22
23
24
L5+
L9–
L9+
GND DISCNCT
CONNECTION DIAGRAMS
TSSOP-24 (Top View)
PW24 Package
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, specifications apply for T
A
= 0°C to 70°C,
TRMPWR = 3.3V. T
A=TJ
.
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
TRMPWR Supply Current Section
TRMPWR Supply Current No Load 25 mA
Disabled Terminator 400 µA
TRMPWR Voltage 2.7 5.25 V
DIFFB
L6+
L8–
L8+
L7–
TRMPWR
L1+
N/C
L4–
L3+
L4+
L1–
L2+
L2–
REG
L3–
DIFSENS
L7+
L6–
L5–
N/C
GND
14
13
12
11
10
9
8
7
6
5
4
3
2
1
15
16
17
18
19
20
21
22
23
24
25
26
27
28
L5+
N/C
DISCNCT
L9–
L9+
LV D
TSSOP-28 (Top View)
PW28 Package
Loading...