ETC UC5607DWP

UC5607
Plug and Play, 18-Line SCSI Active Terminator
FEATURES
DESCRIPTION
• Complies with SCSI and SCSI-2
Standards
The UC5607 provides 18 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 segment.
• 8pF Channel Capacitance during
Disconnect
• SCSI Plug and Play, Dual Low
Disconnect, Logic Low Command
Disconnects All Termination Lines
• Meets SCSI Hot Plugging Capability
• -650mA Sourcing Current for
Termination
The UC5607 provides a low disconnect feature which will disconnect all
terminating resistors, and will disable the regulator, greatly reducing
standby power. The output channels remain high impedance even without
Termpwr applied.
The UC5607 terminator is specially designed with two disconnect pins for
full SCSI Plug and Play (PnP) applications.
Custom power packages are utilized to allow normal operation at full
power conditions (2 Watts).
• +200mA Sinking Current for Active
Negation
• 200µA Supply Current in Disconnect
Mode
Internal circuit trimming is utilized, first to trim the impedance to a 7% tolerance, and then most importantly, to trim the output current to a 7% tolerance, as close to the max SCSI spec as possible, which maximizes noise
margin in fast SCSI operation.
• Trimmed Termination Current to 7%
Other features include thermal shutdown and current limit.
• Trimmed Impedance to 7%
This device is offered in low thermal resistance versions of the industry
standard 28 pin wide body SOIC, and 28 pin PLCC, as well as 24 pin DIP.
• Provides Active Termination for 18
Lines
BLOCK DIAGRAM
Circuit Design Patented
DISCNCT1
DISCNCT2
7/98
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Connect Connect Connect
1
0
1
0
1
1
Disc
0
0
UDG-94124
UC5607
CONNECTION DIAGRAMS
ABSOLUTE MAXIMUM RATINGS
Termpwr Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +7V
Signal Line Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . 0V to +7V
Regulator Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A
Storage Temperature . . . . . . . . . . . . . . . . . . . -65°C to +150°C
Operating Temperature . . . . . . . . . . . . . . . . . -55°C to +150°C
Lead Temperature (Soldering, 10 Sec.). . . . . . . . . . . . . +300°C
PLCC-28 (Top View)
QP Package
Unless otherwise specified all voltages are with respect to
Ground. Currents are positive into, negative out of the specified
terminal. Consult Packaging Section of Unitrode Integrated Circuits databook for thermal limitations and considerations of
packages.
RECOMMENDED OPERATING CONDITIONS
Termpwr Voltage . . . . . . . . . . . . . . . . . . . . . . . . . 3.8V to 5.25V
Signal Line Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . 0V to +5V
Disconnect Input Voltage . . . . . . . . . . . . . . . . . . 0V to Termpwr
* QP package pins 12 - 18 serve as both heatsink and signal
ground.
SOIC-28 (Top View)
DWP Package
** DISCNCT2 is internally tied to ground.
DIL-24 (Top View)
N or J Package
* DWP package pin 8 serves as signal ground; pins 7, 8, 9, 20,
21, 22 serve as heatsink/ground.
Note: Drawings are not to scale.
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UC5607
ELECTRICAL CHARACTERISTICS Unless otherwise stated, these specifications apply for TA = 0°C to 70°C.
TRMPWR = 4.75V, DISCNCT1 = DISCNCT2 = 2.2V. TA = TJ.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
Supply Current Section
Termpwr Supply Current
All termination lines = Open
All termination lines = 0.5V
DISCNCT1 = DISCNCT2 = 0V
Power Down Mode
Output Section (Terminator Lines)
Terminator Impedance
DILINE = –5mA to –15mA
Output High Voltage
Max Output Current
Max Output Current
Output Leakage
Output Capacitance
Regulator Section
Regulator Output Voltage
UNIT
S
30
420
300
45
470
500
mA
mA
mA
TJ = 25°C
0°C < TJ < 70°C
VTRMPWR = 4V (Note 1)
TJ = 25°C
0°C < TJ < 70°C
VLINE = 0.5V
TJ = 25°C
0°C < TJ < 70°C
TJ = 25°C
VLINE = 0.5V, TRMPWR = 4V (Note 1)
0°C < TJ < 70°C
DISCNCT1 = DISCNCT2 = 0V, TRMPWR = 0V to 5.25V
DISCNCT1 = DISCNCT2 = 0V (Note 2)
102
97
2.6
2.55
–19.5
–18.5
–18.0
–17.0
110
110
2.9
2.9
–21.9
–21.9
–21.9
–21.9
10
8
118
129
3.1
3.2
–22.4
–22.4
–22.4
–22.4
400
10
Ohms
Ohms
V
V
mA
mA
mA
mA
nA
pF
All Termination Lines = 5V
2.7
2.55
2.9
2.9
10
20
3.1
3.2
20
50
V
V
mV
mV
TJ = 25°C
0°C < TJ < 70°C
Line Regulation
TRMPWR = 4V to 6V
Load Regulation
IREG = +100mA to –100mA
Note 1: Measuring each termination line while other 17 are low (0.5V).
Note 2: Guaranteed by design. Not 100% tested in production.
APPLICATION INFORMATION
UDG-98136
Figure 1: Typical SCSI Bus Configuration Utilizing UC5607 Device
UNITRODE CORPORATION
7 CONTINENTAL BLVD. • MERRIMACK, NH 03054
TEL. (603) 424-2410 •FAX (603) 424-3460
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IMPORTANT NOTICE
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accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
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performed, except those mandated by government requirements.
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