DS2106S Maxim Integrated Products, DS2106S Datasheet

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DS2106S

Manufacturer Part Number
DS2106S
Description
IC TERMINATOR SCSI 28-SOIC
Manufacturer
Maxim Integrated Products
Datasheet
1.DS2106S.pdf (6 pages)

Specifications of DS2106S

Mounting Type
Surface Mount
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Package / Case
-
Voltage - Supply
-
Operating Temperature
-
Number Of Terminations
-
FEATURES
DESCRIPTION
Fast SCSI and Ultra SCSI require the use of active ter-
minations at both ends of every cable segment in a
SCSI system with single–ended drivers and receivers.
Ultra SCSI requires support of active negation and hot
plugging. The DS2106 is fully compliant with these
standards.
The DS2106 integrates a low drop–out regulator and 18
precise switched 110 ohm termination resistors into a
28–pin 300 mil SOIC package.
Fully compliant with SCSI–1, Fast SCSI and
Ultra SCSI
Functionally compatible with DS21S07A
Provides active termination for 18 signal lines
5% tolerance on termination resistors and voltage
regulator
5% tolerance on termination current
Low power down capacitance of 3 pF
Onboard thermal shutdown circuitry
SCSI bus hot plug compatible
Fully supports actively negated SCSI signals
PIN ASSIGNMENT
Active termination provides: greater immunity to volt-
age drops on the TERMPWR (TERMination PoWeR)
line, enhanced high–level noise immunity, intrinsic
TERMPWR decoupling, and very low quiescent current
consumption. One DS2106 can be used to terminate
the Narrow SCSI bus, and a DS21S07A can be used
with a DS2106 for termination of a Wide SCSI bus.
HS–GND
HS–GND
TPWR
PD
NC
R1
R2
R3
R4
R5
R6
R7
R8
R9
DS2106S 28–PIN SOIC (300 MIL)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
SCSI Terminator
28
27
26
25
24
23
22
21
20
19
18
17
16
15
DS2106
GND
R18
R17
R16
R15
R14
NC
HS–GND
NC
R13
R12
R11
R10
V
REF
022698 1/6
DS2106

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DS2106S Summary of contents

Page 1

... R10 TPWR REF DS2106S 28–PIN SOIC (300 MIL) Active termination provides: greater immunity to volt- age drops on the TERMPWR (TERMination PoWeR) line, enhanced high–level noise immunity, intrinsic TERMPWR decoupling, and very low quiescent current consumption. One DS2106 can be used to terminate the Narrow SCSI bus, and a DS21S07A can be used with a DS2106 for termination of a Wide SCSI bus ...

Page 2

DS2106 REFERENCE DOCUMENTS SCSI–2 (X3.131–1994) SCSI–3 Parallel Interface (X3T10/855D) SCSI–3 Fast–20 (X3T10/1071D) FUNCTION DESCRIPTION The DS2106 is designed single chip termination subsystem for use in Narrow SCSI systems. DS2106 consists of a bandgap reference, buffer ampli- fier, ...

Page 3

TYPICAL SCSI BUS CONFIGURATION Figure 2 Termination Power Line + DS2106 C2 TPWR VREF2 + C1 SCSI CABLE GND R1 R8 R18 SCSI BUS TRANSCEIVER SCSI BUS TRANSCEIVER NOTES 4.7 F tantalum C2 = 2.2 F tantalum ...

Page 4

DS2106 PIN DESCRIPTION Table 1 PIN SYMBOL 1 PD Power Down. When tied low, the DS2106 enters power–down mode. Contains an internal 50K pull–up. Strap low to deactivate the DS2106, leave open cir- cuited to activate the DS2106. 2 –6, ...

Page 5

ABSOLUTE MAXIMUM RATINGS* Voltage on Any Pin Relative to Ground Operating Temperature Storage Temperature Soldering Temperature * This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the ...

Page 6

DS2106 NOTES: 1. 4.00V < TERMPWR < 5.50V. 2. 0.0V < signal lines < TERMPWR. 3. All signal lines = 0.0V. 4. All signal lines open. 5. Power down enabled 0.0V. 6. Guaranteed by design; not production tested. ...

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