Ultra3 LVD/SE SCSI Terminator
www.maxim-ic.com
FEATURES
Fully Compliant with SCSI SPI-2, SPI-3,
SPI-4, Ultra160, and Ultra320
Provides Multimode Low-Voltage
Differential/Single-Ended (LVD/SE)
Termination for Nine Signal Line Pairs
Autoselection 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
PIN CONFIGURATION
VREF
RIP
RIN
R2P
R2N
HS GND
R3P
R3N
R4P
R4N
R5P
R5N
ISO
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TSSOP
28
27
26
25
24
23
22
21
20
19
18
17
16
15
TPWR
TPWR
R9N
R9P
R8N
R8P
HS GND
R7N
R7P
R6N
R6P
DIFF_CAP
DIFFSENSE
MSTR/SLV
ORDERING INFORMATION
VOLTAGE
TEMP RANGE PIN-PACKAGE
(V)
5
28 TSSOP (0.173")
0°C to +70°C
5
28 TSSOP (0.173")
0°C to +70°C
28 TSSOP (0.173")/Tape
5
0°C to +70°C
and Reel
28 TSSOP (0.173")/Tape
5
0°C to +70°C
and Reel
PART
+
Denotes a lead-free/RoHS-compliant package.
*
The top mark includes a "+" on lead-free packages.
TOP MARK*
DETAILED DESCRIPTION
The DS2119M 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 DS2119M will use LVD termination. If any SE devices are connected
to the bus, the DS2119M will use SE termination. This is accomplished automatically inside the part by
sensing the voltage on the SCSI bus DIFFSENS line.
For the LVD termination, the DS2119M integrates two current sources with nine precision resistor
strings. For the SE termination, one regulator and nine precision 110Ω resistors are used. Three
1 of 9
REV: 010406
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
