ST21S07A STMICROELECTRONICS | Alldatasheet

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■ FULLY COMPLIANT 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 110 Ω (±2%) ■ POWER DOWN MODE ISOLATES TERMINATION RESISTORS FROM THE BUS ■ FULLY SUPPORTS ACTIVELY NEGATED SCSI SIGNALS ■ COMPATIBLE TO THE DS2107, DS2107A AND DS21S07 ■ ONBOARD THERMAL SHUTDOWN CIRCUITRY ■ AVAILABLE IN SO-16L AND TSSOP20 ■ SCSI BUS HOT PLUG-COMPATIBLE

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. The ST21S07A SCSI terminator, which is fully 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. ORDERING CODES (*) Available on request Type Temperature Range Package Comments ST21S07ACW 0 to 70 °C SO-16L (Tube) 49parts per tube / 25tube per box ST21S07ACWR 0 to 70 °C SO-16L (Tape & Reel) 1000 parts per reel S21S07ACTR (*) 0 to 70 °C TSSOP20 (Tape & Reel) 2500 parts per reel ST21S07A SCSI TERMINATOR SOP TSSOP

PlN N° (TSSP20) PlN N° (SO-16L) SYMBOL NAME AND FUNCTION 1 1 TERMPWR1 Termination Power 1: Should be connected to the SCSI TERMPWR line. 2 HS-GND Heat Sink Ground: Internally connected to the mounting pad. Should be either grounded or electrically isolated from the other circuitry. 32R 1 Signal Termination 1: 110 Ω Termination 43R 2 Signal Termination 2: 110 Ω Termination 54R 3 Signal Termination 3: 110 Ω Termination 65R 4 Signal Termination 4: 110 Ω Termination 76R 5 Signal Termination 5: 110 Ω Termination 8 HS-GND Heat Sink Ground: Internally connected to the mounting pad. Should be either grounded or electrically isolated from the other circuitry.

97 V REF1 Reference Voltage 1: Must be external connected directly to the VREF2

pin. Must be decoupoled with 4.7µF capacitor as shown in Figure 2 10 8 GND Ground : Signal groud: 0V 11 9 TERMPWR Termination Power21: Should be connected to the SCSI TERMPWR line. 12 HS-GND Heat Sink Ground: Internally connected to the mounting pad. Should be either grounded or electrically isolated from the other circuitry. 13 10 R6 Signal Termination 6: 110 Ω Termination 14 11 R7 Signal Termination 7: 110 Ω Termination 15 12 R8 Signal Termination 8: 110 Ω Termination 16 13 R9 Signal Termination 9: 110 Ω Termination 17 14 NC Not connected: Do not connect any signal to this pin 18 HS-GND Heat Sink Ground: Internally connected to the mounting pad. Should be either grounded or electrically isolated from the other circuitry. 19 15 V REF2 Reference Voltage 2: Must be external connected directly to the VREF1 pin. Must be decoupoled with 4.7µF capacitor 20 16 PD Power Down : When tied low, the ST21S07A enters a power down mode. Contains an internal 60K pull-up. Strap low to deactivate the ST21S07A, leave open circuited to activate the ST21S07A SO-16L TSSOP20

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. RECOMMENDED OPERATING CONDITIONS DC CHARACTERISTICS (TA = 0 to 70°C, unless otherwise specified.) REGULATOR CHARACTERISTICS (TA = 0 to 70°C, unless otherwise specified.) Note 1: TERMPWR = 4V to 5.5V Note2: Signal Lines = 0V to TERMPWR Note3: All signal lines = 0V Note 4: All signal lines open Note 5: PD = 0V Note 6: Guaranteed by design; not production tested Note 7: R1 through R9 only Note 8: R1 through R9 and PD Note 9: VSIGNAL = 0.2V Symbol Parameter Value Unit VPIN Voltage on Any Pin Relative to Ground -1 to 7 V Tstg Storage Temperature Range -55 to +150 °C Top Operating Junction Temperature Range 0 to +70 °C Symbol Parameter Test Conditions Min. Typ. Max. Unit VTP TERMPWR Voltage 4 5.5 V VPDA PD Active -0.3 0.8 V VPDI PD Inactive 2 V TP +0.3 V Symbol Parameter Test Conditions Min. Typ. Max. Unit ITP TERMPWR Current (note 1, 3) (note 1, 4) 1.5 250 mA mA IPD Power Down Current (note 1, 2, 5) 70 150 µA R TERM Termination Resistance (note 1, 2) 108 110 112 Ω TSD Die Thermal Shutdown (note 1, 6) 150 170 °C C PD Power Down TermniatioN Capacitance (note 1, 2, 5, 6) 3 5 pF H PD Power Down Hysteresis (note 1) 280 mV IIH Input Leackage High (note 1, 8) -1 µA IIL Input Leackage Low (note 1, 7) 1 µA Symbol Parameter Test Conditions Min. Typ. Max. Unit VREF Output Voltage (note 1, 2) 2.79 2.85 2.93 V vDROP Drop-out Voltage (note 3, 6) 0.3 0.75 V LIREG Line Regulation (note 1, 4) 0.25 2 % LO REG Load Regulatio (note 1, 2) 0.5 3 % ILIM Current Limit (note 1) 450 mA ISINK Sink Current (note 1) 200 mA IOUT Output Current (note9) 25.2 mA

Figure 2 : Typical Scsi Bus Configuraion NOTES: 1) C1 = 4.7µF tantalium C2 = 2.2µF tantalium or 4.7mF aluminum 2) If the ST21S07A is to be embedded into a peripheral that will act as a target on a SCSI bus, it is that recommended TERMPWR be derived from the SCSI cable, not generated locally. In this configuration, if a power failure occurs in the peripheral, it will not affect the bus. 3) A high frequency bypass capacitor (0.1µF recommended) can be added in parallel to C1 for applications using fast rise/fall time drivers.

DIM. mm inch A2 . 6 5 0 . 1 0 4 a1 0.1 0.2 0.004 0.008 a2 2.45 0.096 b 0.35 0.49 0.014 0.019 b1 0.23 0.32 0.009 0.012 C0 . 5 0 . 0 2 0 c1 45 (typ.) D 10.1 10.5 0.397 0.413 e1 . 2 7 0 . 0 5 0 e3 8.89 0.350 F 7.4 7.6 0.291 0.300 L 0.5 1.27 0.020 0.050 M0 . 7 5 0 . 0 2 9 S8 ( m a x . ) P013I SO16L MECHANICAL DATA

DIM. mm inch A1 . 1 0 . 4 3 3 b 0.19 0.30 0.0075 0.0118 c 0.09 0.2 0.0035 0.0079 e 0.65 BSC 0.0256 BSC o 4o 8o 0o 4o 8o c Eb A2A D PIN 1 IDENTIFICATION A1 LKe TSSOP20 MECHANICAL DATA

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