IMP2119 Datasheet PDF - IMP

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IMP2119
IMP

Part Number IMP2119
Description 9-Line ULTRA3 LVD/SE SCSI Terminator
Page 9 Pages


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IMP2119
DATA COMMUNICATIONS
9-Line ULTRA3 LVD/SE
SCSI Terminator
The IMP2119 is a multimode SCSI terminator that conforms to the SCSI
Parallel Interconnect-2 (SPI-2) specification developed by the T10 stan-
dards committee for low voltage differential (LVD) termination.
Multimode compatibility permits the use of legacy devices on the bus
without hardware alterations. Automatic mode selection is achieved
through voltage detection on the diffsense line.
The IMP2119 delivers the ultimate in SCSI bus performance while saving
wwcowm.DpaotnaeSnhteecot4sUt .acnodmboard area. Elimination of the external capacitors
also mitigates the need for a lengthy capacitor selection process. The indi-
vidual high bandwidth drivers also maximize channel separation and
reduce channel to channel noise and cross talk. The high bandwidth
architecture insures ULTRA3 performance.
When the IMP2119 is enabled, the differential sense (DIFFSENSE) pin
supplies a voltage between 1.2V and 1.4V. In application, this pin is tied
to the DIFFSENSE input of the corresponding LVD transceivers. This
action enables the LVD transceiver function. DIFFSENSE is capable of
supplying a maximum of 15mA. Tying the DIFFSENSE pin HIGH places
the IMP2119 in a high impedance state indicating the presence of an
HVD device. Tying the pin LOW places the part in a single-ended mode
while also signaling the multimode transceiver to operate in a single-
ended mode.
Recognizing the needs of portable and configurable peripherals, the
IMP2119 have a TTL compatible sleep/disable mode. During this
sleep/disable mode, power dissipation is reduced to a meager 15µA
while also placing all outputs in a high impedance state. Also during
Key Features
N Auto-selectable LVD or single-ended termination
N 3.0pF maximum disabled output capacitance
N Fast response, no external capacitors required
N Compatible with active negation drivers
N 15µA supply current in disconnect mode
N Logic command disconnects all termination lines
N DIFFSENSE line driver
N Ground driver integrated for single-ended
operation
N Current limit and thermal protection
N Hot-swap compatible (single-ended)
N Compatible with SCSI, SPI-2, SPI-3, SPI-4
ULTRA160 and ULTRA320
N Pin compatible with DS2119
sleep/disable mode, the DIFFSENSE function is disabled
and is placed in a high impedance state.
Another key feature of the IMP2119 is the master/slave
function. Driving this pin HIGH or floating the pin enables
the 1.3V DIFFSENSE reference. Driving the pin LOW dis-
ables the on board DIFFSENSE reference and enables use
of an external master reference device.
Block Diagram
TPWR
ISO
Internal VREF
1.30V
Power ON
M/S
DIFFSENSE
DIFF_CAP
© 2002 IMP, Inc.
LVD
1.25V
10mA
MODE Control & Delay
Window SE
Comp.
HVD
20kLVD
Power ON & MODE Delay
Power ON
Latch
SE 2.85V, 22.5mA
1.07mA
200 52.5
52.5
SE
2.2V
SE
DISC/HVD
LVD
1.07mA
SE
HVD
LVD
20
Data Communications
1 of 9
LVD(-) / SE
LVD(+) / SE
(Pseudo-GND)
SE
HVD
LVD
5241/42 01 eps
1



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Pin Configuration
TSSOP-28
NC 1
R1P 2
R1N 3
R2P 4
R2N 5
HS GND 6
R3P 7
IMP2119
www.DataSRh3eNet4U.8com
R4P 9
R 4 N 10
R5P 11
R 5 N 12
ISO 13
GND 14
28 TPWR
27 NC
26 R 9 N
25 R9P
24 R 8 N
23 R8P
22 HS GND
21 R7N
20 R7P
19 R 6 N
18 R6P
17 DIFF_CAP
16 DIFFSENSE
15 MASTER/SLAVE
PW Package
IMP2119
Ordering Information
Note:
Part Number
Temperature Range
IMP2119CPW
0°C to 70°C
For Tape and Reel, append the letter “T” to part number. (i.e. IMP2119CPW/T)
Package
28-pin Plastic TSSOP
5241/42_t02.eps
Absolute Maximum Ratings1
TermPwr Voltage . . . . . . . . . . . . . . . . . . . . . . . . +7V
Operating Junction Temperature
Plastic (DB, PW Packages) . . . . . . . . . . . . . 150°C
Storage Temperature Range . . . . . . . . . . . . . . –65°C to 150°C
Thermal Data
Lead Temperature (Soldering, 10 sec.) . . . . . . 300°C
Note: 1. Exceeding these ratings could cause damage to the device. All
voltages are with respect to Ground. Currents are positive
into, negative out of the specified terminal.
PW Package:
Thermal Resistance Junction-to-Ambient, θJA . . . . . . 100°C/W
Junction Temperature Calculation: TJ = TA + (PD x θJA).
The θJA numbers are guidelines for the thermal performance of
the device/pc-board system. No ambient airflow is assumed.
2
408-432-9100/www.impweb.com
© 2002 IMP, Inc.



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Pin Name
R, (1,2,3,4,5,6,7,8)N
R(1,2,3,4,5,6,7,8)P
TPWR
ISO
www.DataSheGeNt4DU.com
MASTER / SLAVE
D IFFSENSE
DIFF_CAP
N.C.
IMP2119
Pin Description
Function
Negative signal termination lines for LVD mode. Signal termination lines for SE mode.
Positive signal termination lines for LVD mode. Pseudo-ground lines for SE mode.
Power supply pin for terminator. Connect to SCSI bus TermPwr. Must be decoupled by one
4.7µF low-ESR capacitor for every three terminator devices. It is absolutely necessary to
connect this pin to the decoupling capacitor through a very low impedance (big traces on PCB).
Keeping distances very short from the decoupling capacitors to theTPWR pin is also critical.
The value of the decoupling capacitor is somewhat layout dependant and some applications
may benefit from an additional 0.1µF decoupling capacitor at the TPWR pin.
Enables / disables terminator. See Table 2 for logic levels
Terminator ground pin. Connect to gro.und
Sometimes referred to as M/S pin. Used to select which terminator is the controlling device.
MASTER/SLAVE pin HIGH or Open enables the DIFFSENSE output drive. See Table 1.
This is a dual function pin. It drives the SCSI bus DIFFSENS line. It is also the sense pin to
detect the SCSI bus mode (LVD, SE or HVD). DIFFSENSE output drive can be disabled with a
LOW level on the MASTER/SLAVE pin. See Table 1 and Table 2. Internally connected to DIFF
_CAP pin trough 20Kohms resistor.
Internally connected to DIFFSENSE pin through 20kresistor. It can be used as a mode sense
pin when the device is a non-controlling terminator (MASTER/SLAVE pin is LOW). An RC filter
(20k/ 0.1µF) is not required on the IMP2119 , as it has an internal timer.
No Connect. Pins should be left open.
© 2002 IMP, Inc.
Data Communications
3



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IMP2119
Recommended Operating Conditions2
Parameter
Symbol Min Typ Max Units
TermPwr Voltage
LVD
SE
VTERM
3.0
3.5
5.25 V
5.25
Signal Line Voltage
0 5.0 V
Disconnect Input Voltage
Operating Virtual Junction Temperature Range
Note: 2. Range over which the device is functional.
0
VTERM
V
0 70 °C
5241/42_t03.eps
Electrical Characteristics
www.DataSheet4U.com
Unless otherwise specified, these specifications apply over the operating ambient temperature range of 0°C TA 70°C. TermPwr = 4.75V.
ISO : IMP2119 = LOW. Low duty cycle pulse testing techniques are used which maintain
junction and case temperatures equal to the ambient temperature.
Parameter
Symbol Condition
LVD Terminator Section
TermPwr Supply Current
LVD ICC All terminator lines = Open
ISO> 2.0 V
Common Mode Voltage
Offset Voltage
Differential Terminator Impedance
Common Mode Impedance
Output Capacitance
Output Leakage
VCM
VFSB
ZD
ZCM
CO
ILEAK
Open circuit between – and + (see Note 3)
VOUT differential = –1V to 1V
0V to 2.5V
ISO > 2.0 V
ISO > 2.0V
VLINE = 0V to 4V, TA = 25°C
ISO > 2.0 V
Mode Change Delay
DIFFSENSE Section
TPWR = 0V, VLINE = 2.7V
tDF DIFFSENSE = 1.4V to 0V
DIFFSENSE Output Voltage
DIFFSENSE Output Source Current
DIFFSENSE Sink Current
DIFFSENSE Output Leakage
Single-Ended Terminator Section
VDIFF
IDIFF
ISINK (DIFF)
ILEAK (DIFF)
VDIFF = 0V
VDIFF = 2.75V
ISO > 2.0V
TA = 25°C
TermPwr Supply Current
SE ICC All terminator lines = Open, MASTER/SLAVE = 0V
All terminator lines = 0.2V, MASTER/SLAVE = 0V
DISCONNECT > 2.0V
Terminator Output High Voltage
Output Current
Sink Current
Output Capacitance
Leakage Current
VO
IO
ISINK
CO
ILEAK
VOUT = 0.2V
VOUT = 4V, all lines
ISO > 2.0V
ISO > 2.0V
VOUT = 0V to 4V, TA = 25°C
ISO > 2.0 V
TPWR= 0V, LINE = 2.7V, TA = 25°C
Ground Driver Impedance
ZG I = 1mA
Thermal Shutdown
Note: 3. Open circuit fallsafe voltage.
Min
1.125
100
100
100
1.2
5.0
2.6
21
45
Typ
25
1
1.25
112
105
200
2.5
1
115
1.3
7
214
15
2.85
23
65
2.5
I
150
Max
30
35
1.375
125
110
300
2
1.4
15.0
200
10
10
226
35
24
2
100
Units
mA
µA
V
mV
pF
µA
ms
V
mA
µA
µA
mA
µA
V
mA
mA
pF
µA
°C
4
408-432-9100/www.impweb.com
© 2002 IMP, Inc.



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