DS2119M+ ,Ultra3 LVD/SE SCSI Terminator DS2119M Ultra3 LVD/SE SCSI Terminator PIN CONFIGURATION
DS2119ME ,Ultra3 LVD/SE SCSI TerminatorFUNCTIONAL DESCRIPTION The DS2119 combines LVD and SE termination with DIFFSENS sourcing and detect ..
DS2119ME ,Ultra3 LVD/SE SCSI TerminatorFUNCTIONAL DESCRIPTION The DS2119 combines LVD and SE termination with DIFFSENS sourcing and detect ..
DS2119ME ,Ultra3 LVD/SE SCSI TerminatorFEATURES Fully Compliant with SCSI SPI-2, SPI-3, SPI-4, Ultra160, and Ultra320 1 28 TPWRVREF R ..
DS2119ME ,Ultra3 LVD/SE SCSI Terminator DS2119M Ultra3 LVD/SE SCSI Terminator PIN CONFIGURATION
DS2119ME ,Ultra3 LVD/SE SCSI TerminatorFUNCTIONAL DESCRIPTION The DS2119 combines LVD and SE termination with DIFFSENS sourcing and detect ..
DS2119M-DS2119M+
Ultra3 LVD/SE SCSI Terminator
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
ORDERING INFORMATION
PART VOLTAGE
(V) TEMP RANGE PIN-PACKAGE TOP MARK* DS2119ME 5 0°C to +70°C 28 TSSOP (0.173") DS2119M
DS2119ME+ 5 0°C to +70°C 28 TSSOP (0.173") DS2119M
DS2119ME/T&R 5 0°C to +70°C 28 TSSOP (0.173")/Tape
and Reel DS2119M
DS2119ME+T&R 5 0°C to +70°C 28 TSSOP (0.173")/Tape
and Reel DS2119M
+ Denotes a lead-free/RoHS-compliant package.
* The top mark includes a "+" on lead-free packages.
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
DS2119M terminators are needed for a wide SCSI bus.
DS2119M
Ultra3 LVD/SE SCSI Terminator
24
27
26
25
23
22
21
20
19
18
17
16
R9N
R9P
R8N
HS GND
R7N
R7P
R6N
R6P
DIFF_CAP
DIFFSENSE
MSTR/SLV
R8P
RIN
R2P
R2N
R3P
R4P
R4N
R5P
R5N
ISO
GND
HS GND
TSSOP 28
15
VREFRIP
TPWR
TPWR
R3N
DS2119M
DS2119M
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
Small Computer Systems Interface (SCSI-3) SCSI Parallel Interface 4 (SPI-4) Project: 1365-D, 200x
Available From: American National Standards Institute (ANSI) Phone: (212) 642-4900
Global Engineering Documents 15 Inverness Way East; Englewood, CO 80112 Phone: (800) 854-7179
FUNCTIONAL DESCRIPTION The DS2119 combines LVD and SE termination with DIFFSENS sourcing and detection.
A bandgap reference is fed into two amplifiers, which creates a 1.25V reference voltage and a 2.85V
reference voltage. The control logic determines which of these references will be applied to the
termination resistors. If the SCSI bus is in LVD mode, then the 1.25V reference will be used. If the SCSI
bus is in SE mode, then the 2.85V reference will be used. That same control logic will switch in/out
parallel resistors to change the total termination resistance accordingly. Finally, in SE mode, the Rp pins
will be switched to ground.
The DIFFSENSE circuitry decodes trinary logic. There will be one of three voltages on the SCSI control
line called DIFFSENS. Two comparators and a NAND gate determine if the voltage is below 0.6V, above
2.15V, or in between. That indicates the mode of the bus to be SE, HVD, or LVD, respectively.
The DS2119M’s DIFF_CAP pin monitors the DIFFSENS line to determine the proper operating mode of
the device. The DIFFSENSE pin can also drive the SCSI DIFFSENS line (when MSTR/SLV = 1) to
determine the SCSI bus-operating mode. The DS2119M switches to the termination mode that is
appropriate for the bus based on the value of the DIFFSENS voltage. These modes are: � LVD Mode: LVD termination is provided by a precision laser-trimmed resistor string with two
current sources. This configuration yields a 105Ω differential and 150Ω common-mode
impedance. A fail-safe bias of 112mV is maintained when no drivers are connected to the SCSI
bus. � SE Mode: When the external driver for a given signal line turns off, the active terminator will pull
that signal line to 2.85V (quiescent state). When used with an active negation driver, the power
amp can sink 22mA per line and the reference voltage will move less than 100mV. The
terminating resistors maintain their 110Ω value. � HVD Isolation Mode: The DS2119M identifies that there is an HVD (high-voltage differential)
device on the SCSI bus and isolates the termination pins from the bus.
When ISO = 1, the termination pins are isolated from the SCSI bus, VREF remains active. During thermal
shutdown, the termination pins are isolated from the SCSI bus and VREF becomes high impedance. The
DIFFSENSE driver is shut down during either of these two events.
DS2119M
as possible to the DS2119M. The DS2119M should be placed as close as possible to the SCSI connector
to minimize signal and power-trace length, thereby resulting in less input capacitance and reflections,
which can degrade the bus signals.
To maintain the specified regulation, a 4.7µF capacitor is required between the VREF pin (VREF) and
ground of each DS2119M. A high frequency cap (0.1µF ceramic recommended) can also be placed on the
VREF pin in applications that use fast rise/fall time drivers. A typical SCSI bus configuration is shown in
Figure 2. � DIFFSENS Noise Filtering: The DS2119M incorporates a digital filter to remove high-frequency
transients on the DIFFSENS control line, thereby eliminating erroneous switching between
modes. This filter eliminates the need for the external capacitor and resistor, which heretofore
performed this function.
NOTES: 1) DIFFSENS. Refers to the SCSI bus signal.
2) DIFFSENSE. Refers to the Dallas Semiconductor pin name and internal circuitry relating the
DIFFSENS driver.
DS2119M
Figure 1. DS2119M Block Diagram DS2119M
Figure 2. SCSI Bus Configuration DS2119M
PIN DESCRIPTION
PIN NAME FUNCTION 1 VREF
Reference Voltage. 2.85V reference in SE mode and 1.25V reference in LVD mode; must be decoupled with a 4.7µF cap.
2–5, 7–12,
18–21, 23–26
RxP,
RxN
Signal Termination. Connect to SCSI bus signal lines. 6, 22 HS GND
Heat Sink Ground. Internally connected to the mounting pad. Should be grounded.
13 ISO
Isolation. When pulled high, the DS2119M isolates its bus pins (RxP, RxN) from the SCSI bus.
14 GND
Ground. Signal ground; 0V. 15 MSTR/SLV
Master/Slave. Mode-select for the noncontrolling terminator. When pulled high, MSTR enables the DIFFSENSE driver.
16 DIFFSENSE
DIFFSENSE. Output to drive the SCSI bus DIFFSENS line. 17 DIFF_CAP
DIFFSENSE Capacitor. Connect a 0.1µF capacitor for DIFFSENSE filter. Input to detect the type of device (differential or single-ended) on
the SCSI bus.
27, 28 TPWR
Termination Power. Connect to the SCSI TERMPWR line and decouple with a 2.2µF capacitor.
RECOMMENDED OPERATING CONDITIONS
PARAMETER SYMBOL MIN TYP MAX UNITS NOTES SE Mode VTPWR(SE) 4.0 5.5 V Termpower
Voltage LVD Mode VTPWR(LVD) 2.7 5.5 V
Logic 0 VIL -0.3 +0.8 V
Logic 1 VIH 2.0 VTPWR +
0.3 V
Operating Temperature VAMB 0 70 °C
