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

REG5601

18-LINE SCSI

ACTIVE TERMINATOR

FEATURES

q COMPLIES WITH SCSI-2 SPECIFICATIONS

q INTERNAL 2.9V REGULATOR

q ON-CHIP TERMINATION RESISTORS

q DISCONNECT ALL TERMINATION

RESISTORS WITH A SINGLE LOGIC

COMMAND

q POWER-DOWN MODE: 150

q LINE CAPACITANCE: 10pF typ

q CURRENT LIMIT AND THERMAL SHUT-

DOWN PROTECTION

q 28-Lead SOIC and SSOP PACKAGES

DESCRIPTION

The REG5601 is an 18-line active terminator for

SCSI-2 (Small Computer Systems Interface) circuitry.

On-chip resistors and 2.9V regulator provide the pre-

scribed 110

Ω termination for low power dissipation

and high speed data transmission.

All line connections can be disconnected from the bus

with a single logic control line to reduce standby

power consumption. Output lines remain high imped-

ance without power applied. Each line is individually

clamped at ground to dissipate negative-going glitches.

The 2.9V regulator is current-limited and thermally

protected. Regulated output is available for external

circuitry.

The REG5601 is available in 28-lead SOIC and fine-

pitch SSOP packages and is specified for operation

over the 0

°C to 70°C temperature range.

Switch

Drive

2.9V

110

Ω

110

Ω

Thermal

Shutdown

Current

Limit

Switch

Clamp

Termpwr

2.9V

Reg Out

Signal

Line 1

Signal

Line 2

•

•

•

(18 Lines)

Termpwr

Ground

Disconnect

REG5601

REG5601

®

PDS-1216B

Printed in U.S.A. August, 1995