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PDF DS21S07A Data sheet ( Hoja de datos )
| Número de pieza | DS21S07A | |
| Descripción | SCSI Terminator | |
| Fabricantes | Maxim Integrated Products | |
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DS21S07A
DS21S07A
SCSI Terminator
FEATURES
• Fully compliant with SCSI–1, Fast SCSI and Ultra
SCSI
• Backward compatible to the DS2107 and DS2107A
• Provides active termination for nine signal lines
• Laser–trimmed 110 ohm termination resistors have
2% tolerance
• Low dropout voltage regulator
• Power–down mode isolates termination resistors
from the bus
• SCSI bus hot plug–compatible
• Fully supports actively negated SCSI signals
• Onboard thermal shutdown circuitry
• 16–pin plastic SOIC (DS21S07AS) and 20–pin plastic
TSSOP (Thin Shrink Small Outline Package)
(DS21S07AE)
PIN ASSIGNMENT
TERMPWR1
R1
1
2
16 PD
15 VREF2
R2 3
14 NC
R3 4
13 R9
R4 5
12 R8
R5 6
11 R7
VREF1
7
10 R6
GND
8
9 TERMPWR2
DS21S07AS 16–PIN SOIC (300 MIL)
TERMPWR1
1
20 PD
HS–GND
2
19 VREF2
R1 3
18 HS–GND
R2 4
17 NC
R3 5
16 R9
R4 6
15 R8
R5 7
14 R7
HS–GND
8
13 R6
VREF1
GND
9
10
12 HS–GND
11 TERMPWR2
DS21S07AE 20–PIN TSSOP (173 MIL)
ACTUAL FOOTPRINT SIZE
.41”
.26”
.41” .27”
DS21S07AS
DS21S07AE
DESCRIPTION
Fast SCSI and Ultra SCSI require the use of active ter-
minations at both ends of every cable segment in a
SCSI system with single–ended drivers and receivers.
The DS21S07A SCSI Terminator, which is fully com-
pliant 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, in-
trinsic TERMPWR decoupling, and very low quiescent
current consumption. The DS21S07A integrates a reg-
ulator and nine precise switched 110 ohm termination
resistors into a monolithic IC. The DS21S07A can be
electrically isolated from the SCSI bus without physical
removal from the SCSI device.
022798 1/7
1 page  
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DS21S07A
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
* 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.
RECOMMENDED OPERATING CONDITIONS
PARAMETER
SYMBOL MIN
TERMPWR Voltage
PD Active
PD Inactive
VTP
VPDA
VPDI
4.00
–0.3
2.0
(0°C to 70°C)
TYP
MAX
UNITS NOTES
5.50 V
+0.8 V
VTP +0.3
V
DC CHARACTERISTICS
PARAMETER
TERMPWR Current
Power Down Current
Termination Resistance
Die Thermal Shutdown
Power Down Termination
Capacitance
Input Leakage High
Input Leakage Low
SYMBOL
ITP
ITP
IPD
RTERM
TSD
CPD
IIH
IIL
MIN
108
150
–1.0
TYP
2.5
100
110
3.0
MAX
250
5
150
112
5.0
1.0
(0°C to 70°C)
UNITS NOTES
mA 1, 3
mA 1, 4
µA 1, 2, 5
ohms
1, 2
°C 1, 6
pF 1, 2, 5, 6
µA 1, 8
µA 1, 7
REGULATOR CHARACTERISTICS
(0°C to 70°C)
PARAMETER
SYMBOL MIN
TYP
MAX
UNITS NOTES
Output Voltage
Drop Out Voltage
Line Regulation
Load Regulation
Current Limit
Sink Current
VREF
2.79
2.85
2.93
V
1, 2
VDROP
0.50 0.75 V 3, 6
LIREG
1.0 2.0 % 1, 4
LOREG
1.3 3.0 % 1, 3
ILIM 350
mA 1
ISINK
200
mA 1
022798 5/7
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet DS21S07A.PDF ] | |
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