UC563
32 LINE VME BUS BIAS GENERATOR
SLUS169A - APRIL 1999 - REVISED NOVEMBER 2000
1
POST OFFICE BOX 655303
·
DALLAS, TEXAS 75265
D
Complies With VME64 Standard
D
2.94-V Regulated Output Voltage With 1%
Tolerance at 25
°
C
D
Provides Bias for up to 32 Lines of Active
Termination for VME busses
D
575-mA Sourcing Current for Termination
D
+475-mA Sinking Current for Active
Negation Drivers
D
Current Limit and Thermal Shutdown
Protection
D
Low Thermal Resistance Surface-Mount
Packages
description
The VME bus bias generator provides current for up to 32 lines of active termination for a VME64 parallel bus.
The VME standards require termination at both ends of the bus. The voltage regulator and internal logic circuits
of these parts provide all the functionality and performance necessary to bias termination resistors for the VME
bus. The VME bus bias generator sink current maintains regulation with all active negation drivers negated.
Internal circuit trimming is used to trim the output voltage to a 1% tolerance. The UC563 regulator source/sink
will provide better VME bus performance and work with active negation drivers. The regulator with resistor
provides the bus with higher pullup current than passive termination. Other features include thermal shutdown
and current limit for short circuit conditions. This device is available in low thermal resistance versions of the
industry standard 8-pin power SOIC.
block diagram
UDG-99094
1
T
J
170
°
C
8
OUT
VCC
2.94 V REFERENCE
+
2
3
6
7
HEAT SINK
GROUND PINS
NOTE: Indicated pinout is for the 8-pin power SOIC package.
Copyright
©
2000, Texas Instruments Incorporated
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.
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.
1
2
3
4
8
7
6
5
OUT
HS/GND
HS/GND
N/C
VCC
HS/GND
HS/GND
N/C
DP PACKAGE
(TOP VIEW)
UC563
32 LINE VME BUS BIAS GENERATOR
SLUS169A - APRIL 1999 - REVISED NOVEMBER 2000
2
POST OFFICE BOX 655303
·
DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature (unless otherwise noted)
VCC
7 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Regulator output current
600 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature, T
stg
65
°
C to 150
°
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Junction temperature, T
J
55
°
C to 150
°
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature (soldering, 10 Sec.)
300
°
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
Currents are positive into, negative out of the specified terminal. Consult Packaging Section of Interface Products Data Book (TI Literature
Number SLUD002) for thermal limitations and considerations of packages. All voltages are referenced to ground.
recommended operating conditions
VCC voltage
4.75 V to 5.25 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ORDERING INFORMATION
TJ
PACKAGED DEVICES
TJ
SOIC (DP)
0
°
C to 70
°
C
UC563DP
The DP package is available tape and reeled. Add TR suffix to each
device type to order quantities of 2500 per reel.
electrical characteristics, T
A
= 0
°
C to 70
°
C, V
CC
= 5 V, C
OUT
= 4.7 F, T
A
= T
J
, (unless otherwise
specified)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Supply Current Section
Supply current
No load
35
60
mA
Supply current
IOUT = 575 mA
610
635
mA
Regulator Section
Output voltage
25
°
C,
No load
2.91
2.94
2.97
V
Load regulation
575mA
IOUT
475 mA,
See Note 1
25
30
mV
Line regulation
4.875 V
VCC
5.25 V,
No load
10
20
mV
Short circuit current
VOUT = 0 V
1200
600
mA
Short circuit current
VOUT = 3.5 V
500
1200
mA
Thermal shutdown
See Note 2
170
°
C
Thermal shutdown hysteresis
See Note 2
10
°
C
NOTES:
1. Tested at a constant junction temperature by low duty cycle pulse testing.
2. Ensured by design. Not production tested.
pin assignments
GND: Ground pin.
HS/GND: Heat sink GND. Connect to large area PC board traces to increase power dissipation capability.
OUT: 2.94-V regulated output voltage pin. The part is internally current limited for both sinking and sourcing
current to prevent damage. For best performance, a 4.7-
µ
F low ESR capacitor is recommended.
VCC: Supply voltage pin. The pin should be decoupled with at least a 2.2-
µ
F low ESR capacitor. For best
performance, a 4.7-
µ
F low ESR capacitor is recommended. Lead lengths should be kept at a minimum.
UC563
32 LINE VME BUS BIAS GENERATOR
SLUS169A - APRIL 1999 - REVISED NOVEMBER 2000
3
POST OFFICE BOX 655303
·
DALLAS, TEXAS 75265
typical application
UDG-00133
1
2
3
4
8
7
6
5
OUT
HS/GND
HS/GND
N/C
N/C
HS/GND
HS/GND
VCC
U1
UC563
C4
4.7
µ
F
C1
4.7
µ
F
194
194
194
194
5 V
1
2
3
4
8
7
6
5
OUT
HS/GND
HS/GND
N/C
N/C
HS/GND
HS/GND
VCC
U4
UC563
C10
4.7
µ
F
C7
4.7
µ
F
5 V
DATA LINE 1
DATA LINE 32
1
2
3
4
8
7
6
5
OUT
HS/GND
HS/GND
N/C
N/C
HS/GND
HS/GND
VCC
U2
UC563
C5
4.7
µ
F
C2
4.7
µ
F
194
194
194
194
5 V
1
2
3
4
8
7
6
5
OUT
HS/GND
HS/GND
N/C
N/C
HS/GND
HS/GND
VCC
U5
UC563
C11
4.7
µ
F
C8
4.7
µ
F
5 V
DATA LINE 33
DATA LINE 64
1
2
3
4
8
7
6
5
OUT
HS/GND
HS/GND
N/C
N/C
HS/GND
HS/GND
VCC
U3
UC563
C6
4.7
µ
F
C3
4.7
µ
F
194
194
194
194
5 V
1
2
3
4
8
7
6
5
OUT
HS/GND
HS/GND
N/C
N/C
HS/GND
HS/GND
VCC
U6
UC563
C12
4.7
µ
F
C9
4.7
µ
F
5 V
DATA LINE 65
DATA LINE 96
IMPORTANT NOTICE
Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those
pertaining to warranty, patent infringement, and limitation of liability.
TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI's standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.
Customers are responsible for their applications using TI components.
In order to minimize risks associated with the customer's applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.
TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other
intellectual property right of TI covering or relating to any combination, machine, or process in which such
semiconductor products or services might be or are used. TI's publication of information regarding any third
party's products or services does not constitute TI's approval, warranty or endorsement thereof.
Copyright
©
2000, Texas Instruments Incorporated
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