STMicroelectronics ST21S07A
The ST21S07A SCSI terminator, which is fully SOP TSSOP compliant with these standands, enables the designer to gain the benefits of active termination: greater immunity to voltages drop on the TERMPWR (TERMination PoWeR) line, enhanced high level noise immunity, intrinsic TERMPWR decouplig, and very low quiescent current consumption. The ST21S07A integrates a regulator and nine precise switched 110Ω termination resistors into a monolithic IC. The ST21S07A can be electrically isolatesd from the SCSI bus without physical removal from the SCSI device.| Part No. | ST21S07A |
|---|---|
| Datasheet | ST21S07A Download |
| Manufacturer |  STMicroelectronics |
| Description | SCSI TERMINATOR |
| Buy | Stock & Price |
DESCRIPTION
The SCSI-2 and SCSI-3 standards recommend the use of active terminations at both ends of every cable segment in a SCSI system with a single-ended drivers and reveivers. ORDERING CODES Type ST21S07ACW ST21S07ACWR S21S07ACTR (*) (*) Available on request Temperature Range 0 to 70 °C 0 to 70 °C 0 to 70 °C Package SO-16L (Tube) SO-16L (Tape & Reel) TSSOP20 (Tape & Reel) Comments 49parts per tube / 25tube per box 1000 parts per reel 2500 parts per reel February 2001 1/10 ST21S07A PIN CONFIGURATION SO-16L TSSOP20 PINDESCRIPTION
PlN N° (TSSP20) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 PlN N° (SO-16L) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 SYMBOL NAME AND FUNCTION TERMPWR1 HS-GND R1 R2 R3 R4 R5 HS-GND VREF1 GND TERMPWR HS-GND R6 R7 R8 R9 NC HS-GND VREF2 PD Termination Power 1: Should be connected to the SCSI TERMPWR line. Must be decoupled with either a 2.2µF or 4.7µF. See Fig. 2. Heat Sink Ground: Internally connected to the mounting pad. Should be either grounded or electrically isolated from the other circuitry.
