UC560
27-LINE SCSI SOURCE/SINK REGULATOR
SLUS213B 鈥?APRIL 1998 鈥?REVISED FEBRUARY 2001
D
SPI-2 and SPI-3 Compliant
D
2.85-V Regulated Output
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D
D
D
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simplified block diagram
THERMAL
SHUTDOWN
8
1
OUT
2.85 V
Voltage with 1.4% Tolerance
Provides Current for up to
27 Lines of Active Termination
for SCSI Buses
TRMPWR
鈥?50-mA Sourcing Current
(See Note A)
for Termination
300-mA Sinking Current for
Active Negation Drivers
0.9-V Dropout Voltage Regulator
at 750 mA and 2.75 V Output
100- A Supply Current in
Disconnect Mode
Current Limit and Thermal Shutdown
Protection
Low Thermal Resistance Surface
Mount Package
+
+
2.85 V
REF
INTERNAL
BIAS
4
ENBL
2
3
6
7
GND GND GND GND
Note A: 4.0 V TO 6.0 V (4.75 V NOMIMAL)
description
The UC560 provides current for up to 27 lines of active termination for a SCSI (small computers systems
interface) parallel bus. The SCSI standard requires active termination at both ends of the cable. The UC560
is based on the UC5603 and UC5613 SCSI active terminators. It uses the voltage regulator and internal logic
circuits of those parts, but has no termination circuits. The UC560 provides greater source current-drive
capability compared to the UC5603 and UC5613.
The UC560 sink current maintains regulation with all active-negation drivers negated. It provides a disconnect
feature which disables the regulator to greatly reduce standby power. Internal circuit trimming is utilized for a
1.4% tolerance output voltage. Other features include thermal shutdown and current limit for short circuit
conditions.
The UC560 is available in low-thermal-resistance version of the industry standard 8-pin power SOIC.
AVAILABLE OPTIONS
TA
0擄C to 70擄C
PACKAGED DEVICES
SOIC (DP)
鈥?/div>
UC560DP
鈥?The DP package is available taped and reeled. Add TR suffix to device type (e.g. UC560DPTR) to order
quantities of 3000 devices per reel.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright
漏
2000, Texas Instruments Incorporated
POST OFFICE BOX 655303
鈥?/div>
DALLAS, TEXAS 75265
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