REG5608

FEATURES

q ACTIVE 18-Line TERMINATOR

q 2pF CAPACITANCE PER LINE

IMPORTANT FOR SCSI FAST-20

q ON-CHIP TERMINATION RESISTORS

q ALL TERMINATIONS DISCONNECT WITH

SINGLE LOGIC SIGNAL

q 325mA CURRENT SINKING FOR ACTIVE

NEGATION

q 22.4mA PER LINE DURING ASSERTION

q CURRENT LIMIT AND THERMAL LIMIT

q HOT-SOCKET CAPABLE

q 28-Lead SOIC and SSOP PACKAGES

DESCRIPTION

The REG5608 is a low capacitance 18-line active

terminator for SCSI (Small Computer Systems

Interface) parallel bus systems. On-chip resistors and

voltage regulator provide the prescribed SCSI bus

termination. Low line capacitance (2pF) meets

requirements for high data rate systems.

All terminations can be disconnected from the bus

with a single logic control line. In the disconnect

mode, output lines remain high impedance with or

without power applied. This allows “hot socket”

equipment plugging as required for “plug and play”

applications.

The internal voltage regulator is temperature-compen-

sated to assure proper termination characteristics over

a wide operating range. Output current and thermal

limit circuitry protect against damage.

The REG5608 is available in 28-lead SOIC and

fine-pitch SSOP packages and is specified for 0

°C to

70

°C operation.

®

LOW CAPACITANCE 18-Line SCSI

ACTIVE TERMINATOR

REG5608

REG5608

TERMPWR

Disconnect

Thermal

Limit

2.9V

Regulator

Reg Out

110

Ω

110

Ω

110

Ω

(18 lines)

SCSI

Termination

Lines

Switch

Drive

Current

Limit

International Airport Industrial Park

•

Mailing Address: PO Box 11400

•

Tucson, AZ 85734

• Street Address: 6730 S. Tucson Blvd. • Tucson, AZ 85706

Tel: (520) 746-1111 • Twx: 910-952-1111 • Cable: BBRCORP

• Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132

© 1995 Burr-Brown Corporation

PDS-1305

Printed in U.S.A. November, 1995