ST21S07A Datasheet | STMicroelectronics

SCSI TERMINATOR s s s s s s s s s s FULLY PLIANT WITH SCSI, SCSI-2 AND EMERGING SCSI-E STANDARDS PROVIDES ACTIVE TERMINATION FOR NINE SIGNAL LINES LOW DROPOUT (0.5V) VREGS:2.85V FACTORY TRIMMED TERMINATION 110Ω (±2%) POWER DOWN MODE ISOLATES TERMINATION RESISTORS FROM THE BUS FULLY SUPPORTS ACTIVELY NEGATED SCSI SIGNALS PATIBLE TO THE DS2107, DS2107A AND DS21S07 ONBOARD THERMAL SHUTDOWN CIRCUITRY AVAILABLE IN SO-16L AND TSSOP20 SCSI BUS HOT PLUG-PATIBLE TSSOP DESCRIPTION The SCSI-2 and SCSI-3 standards remend the use of active terminations at both ends of every cable segment in a SCSI system with a single-ended drivers and reveivers. The ST21S07A SCSI terminator, which is fully ORDERING CODES Type ST21S07ACW ST21S07ACWR S21S07ACTR (- ) (- ) Available on request pliant with these standands, enables the designer to gain the benefits of active termination: greater immunity to voltages drop on the TERMPWR (TERMination Po We R) 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. 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) ments 49parts per tube / 25tube per box 1000 parts per reel 2500 parts per reel .. February 2001 1/10 PIN CONFIGURATION SO-16L TSSOP20 PIN DESCRIPTION Pl N N° (TSSP20) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 10 11 12 13 14 2 3 4 5 6 Pl N N° (SO-16L) 1 SYMBOL NAME AND FUNCTION 7 8 9 15 16 TERMPWR1 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. HS-GND Heat Sink Ground: Internally connected to the mounting pad. Should be either grounded or...