DS2117MB Maxim Integrated Products, DS2117MB Datasheet

IC TERM SCSI LVD/SE ULT-3 36SSOP

DS2117MB

Manufacturer Part Number
DS2117MB
Description
IC TERM SCSI LVD/SE ULT-3 36SSOP
Manufacturer
Maxim Integrated Products
Type
SCSI, LVD, SEr
Datasheet
1.DS2117MB.pdf (9 pages)

Specifications of DS2117MB

Number Of Terminations
9
Voltage - Supply
4 V ~ 5.5 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
36-SSOP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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FEATURES
DESCRIPTION
The DS2117M Ultra3 LVD/SE SCSI terminator is both a low-voltage differential (LVD) and single-
ended (SE) terminator. The multimode operation enables the designer to implement LVD in current
products while allowing the end user SE-backward compatibility with legacy devices. If the device is
connected in an LVD-only bus, the DS2117M uses LVD termination. If any SE devices are connected to
the bus, the DS2117M uses SE termination. This is accomplished automatically inside the part by sensing
the voltage on the SCSI bus DIFFSENS line.
For the LVD termination, the DS2117M integrates two current sources with nine precision resistor
strings. For the SE termination, one regulator and nine precision 110Ω resistors are used. Three
DS2117M terminators are needed for a wide SCSI bus.
www.maxim-ic.com
Fully Compliant with Ultra2, Ultra3, and
Ultra 160/M SCSI
Provides Multimode Low-Voltage
Differential/Single-Ended (LVD/SE)
Termination for Nine Signal Line Pairs
Auto-Selection of LVD or SE Termination
5% Tolerance on SE and LVD
Termination Resistance
Low Power-Down Capacitance of 3pF
On-Board Thermal Shutdown Circuitry
SCSI Bus Hot Plug Compatible
Fully Supports Actively Negated SE SCSI
Signals
Ultra3 LVD/SE SCSI Terminator
1 of 9
PIN CONFIGURATION
TOP VIEW
HS GND
HS GND
HS GND
VREF
GND
R2N
R3N
R1N
R2P
R4P
R4N
R5N
R1P
R3P
R5P
ISO
NC
NC
1
10
11
12
13
15
16
17
18
2
3
5
6
7
8
9
14
4
SSOP
34
33
31
30
29
28
27
26
25
24
23
22
21
20
19
36
35
32
DS2117M
LVD
SE
R9N
R9P
R8P
R7N
R7P
R6N
R8N
HS GND
HS GND
HS GND
R6P
DIFF_CAP
DIFFSENSE
MSTR/SLV
TPWR
HVD
REV: 112905

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DS2117MB Summary of contents

Page 1

FEATURES Fully Compliant with Ultra2, Ultra3, and Ultra 160/M SCSI Provides Multimode Low-Voltage Differential/Single-Ended (LVD/SE) Termination for Nine Signal Line Pairs Auto-Selection of LVD or SE Termination 5% Tolerance on SE and LVD Termination Resistance Low Power-Down Capacitance of ...

Page 2

REFERENCE DOCUMENTS Small Computer Systems Interface (SCSI-3) SCSI Parallel Interface (SPI) Project: 0855-M, 1995 Small Computer Systems Interface (SCSI-3) SCSI Parallel Interface 2 (SPI-2) Project: 1142-M, 1998 Small Computer Systems Interface (SCSI-3) SCSI Parallel Interface 3 (SPI-3) Project: 1302-D, 1999 ...

Page 3

To ensure proper operation, the TPWR pin should be connected to the SCSI bus TERMPWR line. As with all analog circuitry, the TERMPWR and V and a 0.01µF high frequency capacitor are recommended between TPWR and ground and placed as ...

Page 4

Figure 1. DS2117M Block Diagram DS2117M ...

Page 5

Figure 2. SCSI Bus Configuration DS2117M ...

Page 6

PIN DESCRIPTION PIN NAME 1 VREF 4–7, 11–16, RxP, RxN 22–25, 29– 10, 26, HS GND 27 ISO 18 GND 19 MSTR/SLV 20 DIFFSENSE DIFFSENSE. Output to drive the SCSI bus DIFFSENS line. ...

Page 7

RECOMMENDED OPERATING CONDITIONS PARAMETER SE Mode Termpower Voltage LVD Mode Logic 0 Logic 1 Operating Temperature SINGLE-ENDED CHARACTERISTICS PARAMETER SE Termination Resistance SE Voltage Reference SE Output Current Output Capacitance LOW-VOLTAGE DIFFERENTIAL CHARACTERISTICS PARAMETER Differential-Mode Termination Resistance Common-Mode Termination Resistance ...

Page 8

REGULATOR CHARACTERISTICS PARAMETER Line Regulation Load Regulation Current Limit Sink Current NOTES 3.0V. LINE 0.2V. LINE 3) Guaranteed by design. 4) All lines open 2.4V. OUT ...

Page 9

DS2117M 36-PIN SSOP PACKAGE DIM MIN MAX A 2.44 2. 0.29 0.43 c 0.23 0.32 D 15.20 15.54 E 10.11 10.52 E1 7.40 7.60 e 0.80 BSC h 0.25 0.71 L 0.51 1.02 DIMENSIONS D AND ...

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