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Global Mixed-mode Technology Inc.

G219

Ultra320 Multi-mode LVD/SE SCSI Terminator

Features

Auto-selectable multi-mode Single-Ended

or LVD Termination

Meets SCSI-1, SCSI-2, SCSI-3 SPI Ultra

(Fast-20), Ultra 2(SPI-2 LVD), Ultra160 (SPI-3

LVD), and Ultra320 (SPI-4 LVD) standards

Supports active negation

3pF channel capacitance

2.9V to 5.5V operation

Thermal protection

Hot-Swap compatible

5% tolerance on SE and LVD termination

resistance

28 pin TSSOP package

28 Pin TSSOP: Pin Compatible with DS2119

General Description

The G219 Multi-mode LVD/SE SCSI terminator pro-

vides a smooth transition into the next generation of

the SCSI Parallel Interface (SPI-4). It automatically

senses the bus, via DIFFSENS, and switches the ter-

mination to either single-ended (SE) or low voltage

differential (LVD) SCSI, dependent on which type of

devices are connected to the bus. If the G219 detects

a HVD SCSI device, it switches to a high impedance

state. For a 16-bit Wide SCSI bus to be operational,

three G219 terminators are needed.

The Multi-mode terminator contains all functions re-

quired to terminate and auto detect and switch modes

for SCSI Parallel Interface (SPI) bus architectures. For

the SE termination, one regulator and nine precision

110ohm resistors are used. For the LVD termination,

the G219 integrates 18 regulated supplies with nine

precision resistor strings.

Applications

Server and workstation

High-end PC

Industrial PC

Disk Array (RAID)

SCSI cable

Pin Configuration

G219

VREF

R1+

R1-

R2+

R2-

NC/ HS GND

R3+

R3-

R4+

R4-

R5+

R5-

DISCNCT

GND

1

2

3

4

5

6

7

8

9

10

11

12

13

14

28

27

26

25

24

23

22

21

20

19

18

17

16

15

TPWR

TPWR

R9-

R9+

R8-

R8+

NC/ HS GND

R7-

R7+

R6-

R6+

DIFFB

DIFFSENSE

M/S

28Pin TSSOP

Ver 1.2

Feb 08, 2002

TEL: 886-3-5788833

http://www.gmt.com.tw

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