TL2217-285 Datasheet, PDF (1/6 Pages) Texas Instruments – FIXED-VOLTAGE REGULATORS FOR SCSI ACTIVE TERMINATION

D Fully Matches Parameters for SCSI
Alternative 2 Active Termination
D Fixed 2.85-V Output
D ±1.5% Maximum Output Tolerance
at T_J = 25°C
D 1-V Maximum Dropout Voltage
D 500-mA Output Current
D ±3% Absolute Output Variation
D Internal Overcurrent-Limiting Circuitry
D Internal Thermal-Overload Protection
D Internal Overvoltage Protection
TL2217-285
FIXED-VOLTAGE REGULATORS
FOR SCSI ACTIVE TERMINATION
SLVS066F – NOVEMBER 1991 – REVISED JULY 1999
PW PACKAGE
(TOP VIEW)
1
HEAT
2
SINK
3
4
GND ₅
INPUT ₆
7
HEAT
8
SINK
9
10
20
19
HEAT
18
SINK
17
16 ^GND
15 ^OUTPUT
14
13
HEAT
12
SINK
11
description
The TL2217-285 is a low-dropout (1 V) fixed-
voltage regulator specifically designed for small
computer systems interface (SCSI) alternative 2
active signal termination. The TL2217-285 1-V
maximum dropout ensures compatibility with
existing SCSI systems, while providing a wide
TERMPWR voltage range. At the same time, the
±1.5% initial tolerance on its 2.85-V output voltage
ensures a tighter line-driver current tolerance,
thereby increasing system noise margin.
The fixed 2.85-V output voltage of TL2217-285
supports the SCSI alternative 2 termination
standard, while reducing system power
consumption. The 1-V maximum dropout voltage
brings increased TERMPWR isolation, making
the device ideal for battery-powered systems. The
TL2217-285, with internal current limiting,
overvoltage protection, ESD protection, and
thermal protection, offers designers enhanced
system protection and reliability.
HEAT SINK – These pins have an internal
resistive connection to ground and should
be grounded or electrically isolated.
GND
KC PACKAGE†
(TOP VIEW)
OUTPUT
GND
INPUT
KTP PACKAGE†
(TOP VIEW)
GND
OUTPUT
GND
INPUT
† _{The GND terminal is in electrical contact with}
the mounting base.
When configured as a SCSI active terminator, the TL2217-285 low-dropout regulator eliminates the 220-Ω and
330-Ω resistors required for each transmission line with a passive termination scheme, reducing significantly
the continuous system-power drain. When placed in series with 110-Ω resistors, the device matches the
impedance level of the transmission cable and eliminates reflections.
The TL2217-285 is characterized for operation over the virtual junction temperature range of 0°C to 125°C.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright © 1999, Texas Instruments Incorporated
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
1