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PDF DS21T06 Data sheet ( Hoja de datos )
| Número de pieza | DS21T06 | |
| Descripción | SCSI Terminator | |
| Fabricantes | Dallas Semiconducotr | |
| Logotipo |  |
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FEATURES
Fully compliant with SCSI-1, Fast SCSI and
Ultra SCSI
Functional drop in replacement for the
DS2106
Complimentary part to DS21T07 for wide
SCSI
Provides active termination for 18 signal lines
5% tolerance on termination resistors and
voltage regulator
5% tolerance on termination current
Low power down capacitance of 3 pF
Onboard thermal shutdown circuitry
SCSI bus hot plug compatible
Fully supports actively negated SCSI signals
DS21T06
SCSI Terminator
PIN ASSIGNMENT
PD
R1
R2
R3
R4
R5
HS-GND
HS-GND
NC
R6
R7
R8
R9
TPWR
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28 GND
27 R18
26 R17
25 R16
24 R15
23 R14
22 NC
21 HS-GND
20 NC
19 R13
18 R12
17 R11
16 R10
15 VREF
DS21T06S 28-Pin SOIC (300-mil)
DESCRIPTION
Fast SCSI and Ultra SCSI require the use of active terminations at both ends of every cable segment in a
SCSI system with single-ended drivers and receivers. Ultra SCSI requires support of active negation and
hot plugging. The DS21T06 is fully compliant with these standards.
The DS21T06 integrates a low dropout regulator and 18 precise switched 110 ohms termination resistors
into a 28-pin 300-mil SOIC package.
Active termination provides greater immunity to voltage drops on the TERMPWR (TERMination
PoWeR) line, enhanced high-level noise immunity, intrinsic TERMPWR decoupling, and very low
quiescent current consumption. One DS21T06 can be used to terminate the Narrow SCSI bus, or a
DS21T07 can be used with a DS21T06 for termination of a Wide SCSI bus.
REFERENCE DOCUMENTS
SCSI-2 (X3.131-1994)
SCSI-3 Parallel Interface (X3T10/855D)
SCSI-3 Fast–20 (X3T10/1071D)
Available from: Global Engineering Documents
15 Inverness Way East
Englewood, CO 80112-5704
Phone: (800) 854-7179,(303) 792-2181
Fax: (303) 792-2192
1 of 6
112099
1 page  
ABSOLUTE MAXIMUM RATINGS*
Voltage on Any Pin Relative to Ground
Operating Temperature
Storage Temperature
Soldering Temperature
-1.0V to +7.0V
0°C to 70°C
-55°C to +125°C
260°C for 10 seconds
DS21T06
* This is a stress rating only and functional operation of the device at these or any other conditions
above those indicated in the operation sections of this specification is not implied. Exposure to
absolute maximum rating conditions for extended periods of time may affect reliability.
The Dallas Semiconductor DS21T06 is built to the highest quality standards and manufactured for long
term reliability. All Dallas Semiconductor devices are made using the same quality materials and
manufacturing methods. However, the DS21T06 is not exposed to environmental stresses, such as burn-
in, that some industrial applications require. For specific reliability information on this product, please
contact the factory in Dallas at (972) 371-4448.
RECOMMENDED OPERATING CONDITIONS
PARAMETER
TERMPWR Voltage
PD Active
PD Inactive
SYM
VTP
VPDA
VPDI
MIN
4.00
-0.3
2.00
TYP
DC CHARACTERISTICS
PARAMETER
TERMPWR Current
SYMBOL
ITP
Power-Down Current
Termination Resistance
Die Thermal Shutdown
Power-Down
Termination Capacitance
Input Leakage High
Input Leakage Low
IPD
RTERM
TSD
CPD
IIH
IIL
MIN
107.5
-1.0
TYP
10
500
110
150
REGULATOR CHARACTERISTICS
PARAMETER
Output Voltage
Drop Out Voltage
Output Current
Line Regulation
Load Regulation
Current Limit
Sink Current
SYMBOL
VREF
VDROP
IOUT
LIREG
LOREG
IL
ISINK
MIN
2.7
TYP
2.85
0.75
1.0
1.3
700
400
MAX
5.25
0.8
VTP + 0.3
(0°C to 70°C)
UNITS
V
V
NOTES
V
MAX
500
14
119.5
3
(0°C to 70°C)
UNITS NOTES
mA 1, 3
1, 4
µA 1, 2, 5
Ω 1, 2
°C 1
pF 1, 2, 5, 6
µA 1
1.0 µA 1, 7
MAX
3.0
1.0
25.2
2.0
3.0
(0°C to 70°C)
UNITS
V
V
NOTES
1, 2
3, 6
mA 9
% 1, 4
% 1, 2
mA 1
mA 1
5 of 6
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet DS21T06.PDF ] | |
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