ML6509CS Ver la hoja de datos (PDF) - Micro Linear Corporation

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ML6509CS

Active SCSI Terminator

Micro Linear Corporation 

ML6509

GENERAL DESCRIPTION (Continued)

One unique feature of the ML6509 is its support for a Low

Power mode, for use in Notebook and portable computer

applications, where it provides a 1mA (approximately

2.5KW termination) for less than 6" cable lengths. This

minimizes the battery drain significantly in such systems.

Current limiting and thermal shutdown protection are also

provided. The nine line configuration is optimal for wide

SCSI’s 18, 27, or 45 line termination needs.

PIN CONFIGURATION

16-Pin SOIC

TERMPWR

1

NC

2

NC

3

GND

4

DISCNKT

5

LPWR

6

L1

7

L2

8

16

L9

15

L8

14

L7

13

VREF

12

L6

11

L5

10

L4

9

L3

TERMPWR

HS

NC

GND

NC

DISCNKT

LPWR

HS

L1

L2

20-Pin TSSOP

1

20

2

19

3

18

4

17

5

16

6

15

7

14

8

13

9

12

10

11

L9

L8

HS

L7

VREF

L6

L5

L4

HS

L3

PIN DESCRIPTION

NAME

TERMPWR

L1

L2

L3

L4

L5

L6

L7

L8

L9

DESCRIPTION

Termination Power. Should be connected

to the SCSI TERMPWR line. A 10µF

tantalum local bypass capacitor is

recommended per system, as shown in

the application diagram

Signal Termination 1. SCSI bus line 1

Signal Termination 2. SCSI bus line 2

Signal Termination 3. SCSI bus line 3

Signal Termination 4. SCSI bus line 4

Signal Termination 5. SCSI bus line 5

Signal Termination 6. SCSI bus line 6

Signal Termination 7. SCSI bus line 7

Signal Termination 8. SCSI bus line 8

Signal Termination 9. SCSI bus line 9

NOTE : The DISCNKT and LPWR lines have 200ký internal pullup resistors

connected to the supply. These pins should be left floating for normal

operation and should be connected to ground to enable the function.

2

NAME

VREF

DISCNKT

LPWR

GND

HS

DESCRIPTION

2.85VREF Output. External decoupling

with a 10µF tantalum in parallel with a

0.1µF ceramic capacitor is

recommended, as shown in the

application diagram.

Disconnect Terminator. Logic input to

disconnect the terminator from the bus

when the SCSI device no longer needs

termination due to not being the last

device on the bus or otherwise. Active

low input.

Low Power Mode. Logic input to switch

the terminator mode to a ~2.5kW

termination, with a 1mA drive capability,

meant for power conscious battery

applications which use SCSI devices

supporting cable lengths less than six

inches. Active low input.

Ground. Signal Ground (0V)

Heat Sink Ground. Should be connected

to GND.

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