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UCC5614PW Datasheet(PDF) 2 Page - Texas Instruments |
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UCC5614PW Datasheet(HTML) 2 Page - Texas Instruments |
2 / 10 page UCC5614 SLUS349B − DECEMBER 1994 − REVISED APRIL 2005 2 www.ti.com DESCRIPTION (CONTINUED) The UCC5614 can be programmed for either a 110- Ω or 2.5-kΩ termination. The 110-Ω termination is used for standard SCSI bus lengths and the 2.5-k Ω termination is typically used in short bus applications. When driving the TTL compatible DISCNCT pin directly, the 110- Ω termination is connected when the DISCNCT pin is driven low, and disconnected when driven high. When the DISCNCT pin is driven through an impedance between 80 k Ω and 150 kΩ, the terminator is in short bus mode. The 2.5-kΩ termination is connected when the DISCNCT pin is driven low and disconnected when driven high. The power amplifier output stage allows the UCC5614 to source full termination current and sink active negation current when all termination lines are actively negated. The UCC5614 is pin for pin compatible with Unitrode’s other 9-line SCSI terminators, allowing lower capacitance and lower voltage upgrades to existing systems. The UCC5614, as with all Unitrode terminators, is completely hot pluggable and appears as high impedance at the terminating channels with VTRMPWR = 0 V or open. Internal circuit trimming is utilized, first to trim the 110- Ω termination impedance to a 7% tolerance, and then most importantly, to trim the output current to a 4% tolerance, as close to the max SCSI specification as possible, which maximizes noise margin in fast SCSI operation. Other features include thermal shutdown and current limit. This device is offered in low thermal resistance versions of the industry standard 16-pin narrow body SOIC, 16-pin N and 24-pin TSSOP. ORDERING INFORMATION TA PACKAGED DEVICE TA SOIC-16 (DP) { DIL-16 (N) TSSOP-24 (PW) } 0 °C to 70°C UCC5614DP UCC5614N UCC5614PW † † The DP package is available taped and reeled in quanities of 2,500. Add TR suffix to device type (e.g. UCC5614DPTR) to order quantities of 2,500 devices per reel. ‡ The PW package is available taped and reeled in quanities of 2,000. Add TR suffix to device type (e.g. UCC5614PWTR) to order quantities of 2,000 devices per reel. Obsolete Device |
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