DS2105Z+ Maxim Integrated, DS2105Z+ Datasheet

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DS2105Z+

Manufacturer Part Number
DS2105Z+
Description
SCSI Interface IC
Manufacturer
Maxim Integrated
Series
DS2105r
Datasheet

Specifications of DS2105Z+

Rohs
yes
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.
The DS2105 SCSI Terminator, which is fully compliant
with these standards, enables the designer to gain the
benefits of active termination: 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
Fully compliant with SCSI–1, Fast SCSI and Ultra
SCSI
Functionally compatible to the DS21S07A, targeted
for high volume applications
Provides active termination for nine signal lines
Laser–trimmed 110 ohm termination resistors have
5% tolerance
Low dropout voltage
Power–down mode isolates termination resistors
from the bus
Fully supports actively negated SCSI signals
Onboard thermal shutdown circuitry
16–pin plastic SOIC (DS2105)
PIN ASSIGNMENT
consumption. The DS2105, which integrates a regula-
tor and nine precise switched 110 ohm termination re-
sistors into a monolithic IC, is a functionally compatible
version of the DS21S07A. With relaxed output current
and termination tolerances, the DS2105 is intended for
high volume applications which require active termina-
tion but not the high performance of the DS21S07A.
The DS2105 is offered in both 300 mil and 150 mil SOIC
packages.
TERMPWR1
TERMPWR1
VREF1
GND
VREF1
R1
R2
R3
R4
R5
GND
DS2105Z 16–PIN SOIC (150 MIL)
DS2105S 16–PIN SOIC (300 MIL)
R1
R2
R3
R4
R5
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
SCSI Terminator
16
15
14
13
12
10
11
9
16
15
14
13
12
11
10
9
PD
VREF2
R9
R8
R7
R6
NC
TERMPWR2
DS2105
PD
VREF2
NC
R9
R8
R7
R6
TERMPWR2
022698 1/7
DS2105

Related parts for DS2105Z+

DS2105Z+ Summary of contents

Page 1

FEATURES Fully compliant with SCSI–1, Fast SCSI and Ultra SCSI Functionally compatible to the DS21S07A, targeted for high volume applications Provides active termination for nine signal lines Laser–trimmed 110 ohm termination resistors have 5% tolerance Low dropout voltage Power–down mode ...

Page 2

DS2105 FUNCTIONAL DESCRIPTION The DS2105 consists of a bandgap reference, buffer amplifier, and nine termination resistors (Figure 1). The bandgap reference circuit produces a precise 2.55V level which is fed to a buffer amplifier. The buffer pro- duces a 2.85V ...

Page 3

TYPICAL SCSI BUS CONFIGURATION Figure 2 Termination Power Line + DS2105 C2 TERMPWR1 TERMPWR2 VREF1 VREF2 + C1 SCSI CABLE GND SCSI BUS TRANSCEIVER SCSI BUS TRANSCEIVER NOTES 4.7 F tantalum C2 = 2.2 ...

Page 4

DS2105 PIN DESCRIPTION Table 1 DS2105S DS2105Z SYMBOL PIN PIN 1 1 TERMPWR1 Termination Power 1. Should be connected to the SCSI TERMPWR line. Must be decoupled with either a 2 4.7 F. See Figure ...

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

DS2105 6. Guaranteed by design; not production tested through R only through R and PD =0.2V. SIGNAL DS2105Z SCSI TERMINATOR 16–PIN SOIC (150 MIL) Î Î Î Î PKG 16–PIN ...

Page 7

DS2105S SCSI TERMINATOR 16–PIN SOIC (300 MIL) The chamfer on the body is optional not present, a terminal 1 identifier must be positioned so that 1/2 or more of its area is contained in the hatched zone. ...

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