ML6518CS MICRO-LINEAR [Micro Linear Corporation], ML6518CS Datasheet

ML6518CS

Manufacturer Part Number

ML6518CS

Description

18 Line Hot-Insertable Active SCSI Terminator

Manufacturer

MICRO-LINEAR [Micro Linear Corporation]

Datasheet

1.ML6518CS.pdf (8 pages)

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Meier Automation Equipment Co., Limited

Part Number:

ML6518CS

Manufacturer:

MICROLINEAR

Quantity:

20 000

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GENERAL DESCRIPTION

The ML6518 BiCMOS 18 line SCSI terminator provides

active termination in SCSI systems using single-ended

drivers and receivers. Active SCSI termination helps to

effectively control analog transmission line effects such as

ringing, noise, crosstalk, and ground bounce. In addition,

the ML6518 provides support for hot insertability on the

SCSI bus.

The ML6518 provides a V-I characteristic optimized to

minimize transmission line effects during both signal

negation and assertion using a MOSFET-based

architecture. The desired V-I characteristic is achieved by

trimming one resistor in the control block. Internal

clamping controls signal assertion transients and provides

current sink capability to handle active negation driver

overshoots above 2.85V. It provides a 2.85V reference

through an internal low dropout (1V) linear regulator.

The ML6518 also provides a disconnect function which

effectively removes the terminator from the SCSI bus. The

disconnect mode capacitance is typically less than 5pF

per line. Current limiting and thermal shutdown protection

are also included.

BLOCK DIAGRAM

NCLAMP = Negative Clamp

GND

18 Line Hot-Insertable Active SCSI Terminator

NCLAMP

1V DROPOUT

REGULATOR

TERMPWR

LINEAR

MOSFETs WITH I

18 TERMINATION LINES

. . .

2.85V

. . .

MAX

= 24mA

L18

FEATURES

REF

Fully monolithic IC solution providing active

termination for 18 lines of the SCSI bus

Provides onboard support for hot-insertability on the

SCSI bus

Low dropout voltage (1V) linear regulator, trimmed for

accurate termination current

Low disconnect capacitance (typically < 5pF)

Logic pin with active pull-up to disconnect terminator

from the SCSI bus

Current sinking capability in excess of 8.3mA per line to

handle active negation driver overshoots above 2.85V

Negative clamping on all lines to handle signal

assertion transients

Regulator can source 400mA and sink 150mA while

maintaining regulation

Current limit and thermal shutdown protection

*This Part Is End Of Life As Of August 1, 2000

TRIM

Circuit design patent pending.

. . .

DISCNKT

2.85V

REF

CONTROL

BLOCK

ML6518*

August 2000

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ML6518CS Summary of contents

Page 1

Line Hot-Insertable Active SCSI Terminator GENERAL DESCRIPTION The ML6518 BiCMOS 18 line SCSI terminator provides active termination in SCSI systems using single-ended drivers and receivers. Active SCSI termination helps to effectively control analog transmission line effects such as ringing, ...

Page 2

ML6518 PIN CONFIGURATIONS 2 ML6518 28-Pin SOIC (S28) ML6518 28-Pin SOIC (S28) I SENSE RSCS VREF SPEED ...

Page 3

PIN DESCRIPTION TQFP SOIC PIN# PIN# NAME FUNCTION Signal termination for SCSI bus line Signal termination for SCSI bus line Signal termination for SCSI bus line ...

Page 4

ML6518 ABSOLUTE MAXIMUM RATINGS Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. Signal Line Voltage ...... GND – 0.3V to ...

Page 5

FUNCTIONAL DESCRIPTION SCSI terminators are used to decrease the transmission line effects of SCSI cable. Termination must be provided at the beginning and end of the SCSI bus to ensure that data errors due to reflections on the bus are ...

Page 6

ML6518 As outlined in Annex G of the ANSI SCSI-3 Parallel Interface Specification (X3T9.2/855D), “The SCSI bus termination shall be external to the device being inserted or removed.” In other words, any terminator connected to a device being hot inserted/removed ...

Page 7

PHYSICAL DIMENSIONS 0.354 BSC (9.00 BSC) 0.276 BSC (7.00 BSC) 1 PIN 0.032 BSC (0.8 BSC) 0.699 - 0.713 (17.75 - 18.11) 28 PIN 0.024 - 0.034 0.050 BSC (0.61 - 0.86) (1.27 BSC) ...

Page 8

... ML6518 ORDERING INFORMATION PART NUMBER ML6518CH ML6518CS © Micro Linear 1997 is a registered trademark of Micro Linear Corporation Products described in this document may be covered by one or more of the following patents, U.S.: 4,897,611; 4,964,026; 5,027,116; 5,281,862; 5,283,483; 5,418,502; 5,508,570; 5,510,727; 5,523,940; 5,546,017; 5,559,470; 5,565,761; 5,592,128; 5,594,376; Japan: 2598946; 2619299. Other patents are pending. ...

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