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PDF DS21T05 Data sheet ( Hoja de datos )

Número de pieza DS21T05
Descripción SCSI Terminator
Fabricantes Dallas Semiconducotr 
Logotipo Dallas Semiconducotr Logotipo



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DS21T05
SCSI Terminator
FEATURES
PIN ASSIGNMENT
Fully compliant with SCSI-1, Fast SCSI and
Ultra SCSI
Functionally compatible to the DS21T07,
targeted for high volume applications
Provides active termination for nine signal
TERMPWR1
R1
R2
R3
1
2
3
4
16 PD
15 VREF2
14 R9
13 R8
lines
Laser-trimmed 110-ohm termination resistors
have 5% tolerance
Low dropout voltage
R4
R5
VREF1
GND
5
6
7
8
12 R7
11 R6
10 NC
9 TERMPWR2
Power-down mode isolates termination
DS21T05Z 16-Pin SOIC (150-mil)
resistors from the bus
SCSI bus hot-plug compatible
Fully supports actively negated SCSI signals
Onboard thermal shutdown circuitry
TERMPWR1
R1
R2
1
2
3
16 PD
15 VREF2
14 NC
16-pin plastic narrow SOIC
R3 4
13 R9
R4 5
12 R8
R5 6
11 R7
VREF1 7
10 R6
GND 8
9 TERMPWR2
DS21T05S 16-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. The DS21T05 SCSI Terminator, which is fully
compliant with these standards, enables the designer to gain the benefits of active termination: 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. The DS21T05,
which integrates a regulator and nine precise-switched, 110-ohm termination resistors into a monolithic
IC, is a functionally compatible version of the DS21T07. With relaxed output current and termination
tolerances, the DS21T05 is intended for high volume applications which require active termination but
not the high performance of the DS21T07.
FUNCTIONAL DESCRIPTION
The DS21T05 consists of a bandgap reference, buffer amplifier, and nine termination resistors (Figure 1).
The bandgap reference circuit produces a precise 2.55V level which is fed to a buffer amplifier. The
buffer produces a 2.85V level and is capable of sourcing at least 24 mA into each of the termination
resistors when the signal line is low (active). When the driver for a given signal line turns off, the
terminator will pull the signal line to 2.85V (quiescent state). To handle actively negated SCSI signals,
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DS21T05 pdf
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
DS21T05
* 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 DS21T05 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 DS21T05 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
SYM
MIN
TYP
TERMPWR Voltage
PD Active
VTP
VPDA
4.00
-0.3
PD Inactive
VPDI
2.0
DC CHARACTERISTICS
PARAMETER
SYMBOL
TERMPWR Current
Power-Down Current
Termination Resistance
Die Thermal Shutdown
Power Down
Termination Capacitance
ITP
ITP
IPD
RTERM
TSD
CPD
Input Leakage High
Input Leakage Low
IIH
IIL
MIN
107.5
150
-1.0
TYP
5
500
110
REGULATOR CHARACTERISTICS
PARAMETER
SYMBOL
MIN
Output Voltage
Drop Out Voltage
Output Current
Line Regulation
Load Regulation
Current Limit
Sink Current
VREF
VDROP
IOUT
LIREG
LOREG
ILIM
ISINK
2.7
200
TYP
2.85
0.75
1.0
1.3
350
MAX
5.50
+0.8
VTP + 0.3
(0°C to 70°C)
UNITS
V
V
NOTES
V
MAX
250
8
119.5
3.0
(0°C to 70°C)
UNITS NOTES
mA 1, 3
mA 1, 4
µA 1, 2, 5
ohm 1, 2
°C 1, 6
pF 1, 2, 5, 6
µA 1, 8
1.0 µA 1, 7
MAX
3.1
1.0
25.2
2.0
3.0
(0°C to 70°C)
UNITS NOTES
V 1, 2
V 3, 6
mA 9
% 1, 4
% 1, 2
mA 1
mA 1
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