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Status
All versions are No Longer Available.
Description
The DS21T07 is backward-compatible with the DS2107, DS2107A, and DS21S07 providing precision resistance values for SCSI-1, Fast, and Ultra SCSI with 2% tolerance on the resistors and voltage regulator.
The DS21T07 actively terminates cable segments in SCSI systems carrying nine single-ended drivers and receivers. In an 8-bit wide SCSI arrangement, two DS21T07s connected at each end of the SCSI cable can terminate 18 active signal lines. A 16-bit wide SCSI arrangement requires three DS21T07s at each end to terminate 27 active signal lines.
SCSI termination is used wherever data must be transmitted without voltage drops caused by signal reflection at the parallel bus termination point, which is often significant in multidropped systems.
All Dallas terminators feature power-down mode with extremely low-quiescent consumption. Different SCSI terminators are available to match every existing SCSI protocol and to address different design concerns, such as price, board space, and voltage differential.
The DS21T07 gives the end user more margin for configuration because it allows maximum current into the SCSI bus. Where board space is a problem it’s available in a TSSOP package.
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Data Sheet
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Key Features
- Fully compliant with SCSI-1, Fast, and Ultra SCSI standards
- Backward-compatible with DS2107 and DS2107A
- Provides active signal termination for 9 lines
- Handles actively negated SCSI signals
- Laser-trimmed, precision 110-ohm resistors with 2% tolerance
- 2% tolerance on voltage regulator
- Low drop-out voltage
- Low standby current consumption of 100µA
- Power-down mode with resistors isolated from bus
- SCSI bus hot-plug compatible
- Onboard thermal shutdown circuitry
- Operating range:
- 0°C to +70°C
- 4.0V to 5.5V
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Reliability Reports
Software/Models
Ordering Information
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Part Number
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Notes |
Free
Sample |
Buy |
Status
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| DS21T07E
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5% 9-Channel SCSI Terminator |
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N/A |
No Longer Available |
TSSOP;20 pin;45.2 mm²
Outline Drawing:21-0066 (PDF)
Land Pattern: 90-0116 (PDF)
Use pkgcode/variation: U20-1F*
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0°C to +70°C
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RoHS/Lead-Free: No
Materials Analysis |
| DS21T07E+
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N/A |
No Longer Available |
TSSOP;20 pin;45.2 mm²
Outline Drawing:21-0066 (PDF)
Land Pattern: 90-0116 (PDF)
Use pkgcode/variation: U20+1F*
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0°C to +70°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| DS21T07E+T&R
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N/A |
No Longer Available |
TSSOP;20 pin;45.2 mm²
Outline Drawing:21-0066 (PDF)
Land Pattern: 90-0116 (PDF)
Use pkgcode/variation: U20+1F*
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0°C to +70°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| DS21T07E/T&R
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N/A |
No Longer Available |
TSSOP;
Land Pattern: Not Available
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0°C to +70°C
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See data sheet
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| DS21T07E/T&R/C03
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N/A |
No Longer Available |
TSSOP;
Land Pattern: Not Available
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0°C to +70°C
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See data sheet
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| DS21T07E/T&R/C16
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N/A |
No Longer Available |
TSSOP;
Land Pattern: Not Available
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0°C to +70°C
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See data sheet
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| DS21T07S
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5% 9-Channel SCSI Terminator |
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N/A |
No Longer Available |
SOIC(W);16 pin;111.8 mm²
Outline Drawing:21-0042 (PDF)
Land Pattern: 90-0107 (PDF)
Use pkgcode/variation: W16-1*
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0°C to +70°C
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RoHS/Lead-Free: No
Materials Analysis |
| DS21T07S+
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N/A |
No Longer Available |
SOIC(W);16 pin;111.8 mm²
Outline Drawing:21-0042 (PDF)
Land Pattern: 90-0107 (PDF)
Use pkgcode/variation: W16+1*
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0°C to +70°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| DS21T07S+T&R
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N/A |
No Longer Available |
SOIC;
Land Pattern: Not Available
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0°C to +70°C
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See data sheet
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| DS21T07S/T&R
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N/A |
No Longer Available |
SOIC;
Land Pattern: Not Available
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0°C to +70°C
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See data sheet
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Part Number
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Notes |
Free
Sample |
Buy |
Status
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| DS21T07S/T&R/C15
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N/A |
No Longer Available |
SOIC;
Land Pattern: Not Available
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0°C to +70°C
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See data sheet
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Notes:
- Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
- Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
- Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
- * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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Information Index
Rev 1;
1999-11-20
This page last modified: 2007-07-25
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