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IMP5241/42
(R)
ISO 9001 Registered
9-Line Multimode LVD/SE SCSI Terminator
KEY FEATURES
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 IMP5241/42 in a HI Z 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 IMP5241/42 have a TTL compatible sleep/disable mode. During this sleep/disable mode, power dissipation is reduced to a meager 5A while also placing all outputs in a HI Z state. Also during sleep/ disable mode, the DIFFSENSE function is disabled and is placed in a HI Z state. Another key feature of the IMP5241/42 is the master / slave function. Driving this pin high or floating the pin enables the 1.3V DIFFSENSE reference. Driving the pin low disables the on board DIFFSENSE reference and enables use of an external master reference device.
s AUTO-SELECTABLE LVD OR SINGLE-ENDED TERMINATION s 3.0pF MAXIMUM DISABLED OUTPUT CAPACITANCE s FAST RESPONSE, NO EXTERNAL CAPACITORS REQUIRED s COMPATIBLE WITH ACTIVE NEGATION DRIVERS s 5A SUPPLY CURRENT IN DISCONNECT MODE s LOGIC COMMAND DISCONNECTS ALL TERMINATION LINES s DIFFSENSE LINE DRIVER s GROUND DRIVER INTEGRATED FOR SINGLE-ENDED OPERATION s CURRENT LIMIT AND THERMAL PROTECTION s HOT-SWAP COMPATIBLE (SINGLE-ENDED) s COMPATIBLE WITH SCSI 1, 2, 3, FAST-20, AND THE PENDING SPI-2 LVD s SEE IMP5244 FOR LVD TERMINATION ONLY
DESCRIPTION
The IMP5241/42 is a multimode SCSI terminator that conforms to the SCSI Parallel Interconnect2 (SPI-2) specification developed by the T10 standards committee for low voltage differential (LVD) termination, while providing backwards compatibility to the SCSI, SCSI-2, and SPI singleended specifications. 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 IMP5241/42 utilizes IMP's adaptive nonlinear technology for the ultimate in SCSI bus performance while saving component cost and board area. Elimination of the external capacitors also mitigates the need for a lengthy capacitor selection process. The individual high bandwidth drivers also maximize channel separation and reduce channel to channel noise and cross talk. The high bandwidth architecture insures ULTRA2 performance while providing a clear migration path to ULTRA3 and beyond. When the IMP5241/42 is enabled, the differential sense (DIFFSENSE) pin supplies a voltage between 1.2V and 1.4V. In application, this pin
PRODUCT HIGHLIGHT
B U S V O LTA G E
V OD
VOD = V(-) - V(+), Logic = 0
V(+)
100mV 0V
NEGATED
VCM
V(-)
-100mV
IMP5241
IMP5241
PACKAGE ORDER INFORMATION TA (C) 0 to 70
DB Plastic SSOP 36-pin
IMP5241CDB IMP5242CDB
PW Plastic TSSOP 24-pin
IMP5241CPW IMP5242CPW
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. IMP5241/42CDBT)
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PACKAGE PIN OUTS
N.C. N.C. N.C. 1+ 12+ 2HEATSINK/GND HEATSINK/GND HEATSINK/GND 3+ 34+ 45+ 5*DISCONNECT GND
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19
TermPwr Voltage ................................................................................................. +7V Operating Junction Temperature Plastic (DB, PW Packages) ........................................................................... 150C Storage Temperature Range .............................................................. -65C to 150C Lead Temperature (Soldering, 10 seconds) ..................................................... 300C
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.
THERMAL DATA
DB PACKAGE:
THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA ........................................... 50C/W
PW PACKAGE:
VTERM HVD LVD SE 99+ 88+ HEATSINK/GND HEATSINK/GND HEATSINK/GND 77+ 66+ DIFF B DIFFSENSE MASTER/SLAVE
THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA ..................................... 144C/W
Junction Temperature Calculation: TJ = TA + (PD x JA). The JA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow.
DB PACKAGE (Top View)
MASTER / SLAVE FUNCTION TABLE
MASTER / SLAVE L* H Open (Pull-up) DIFFSENSE Status HI Z 1.3V 1.3V Output Current 0mA 15mA Source 15mA Source
1+ 12+ 23+ 34+ 45+ 5*DISCONNECT GND
1 2 3 4 5 6 7 8 9 10 11 12
24 23 22 21 20 19 18 17 16 15 14 13
VTERM N.C. 99+ 88+ 77+ 66+ DIFFSENSE MASTER/SLAVE
PW PACKAGE (Top View)
* When in LOW state, terminator will detect state of DIFFSENSE line.
*DISCONNECT
for the IMP5242
DIFFSENSE / POWER UP / POWER DOWN FUNCTION TABLE
IMP5241 DISCONNECT L L L H Open IMP5242 DISCONNECT H H H L Open DIFF SENSE L < 0.5V 0.7 to 1.9V H > 2.4V X Outputs
Status Type
Enable Enable Disable Disable
S.E. LVD HI Z HI Z
2
RECOMMENDED OPERATING CONDITIONS (Note 2) Parameter
Termpwr Voltage LVD SE
Symbol
VTERM
Recommended Operating Conditions Min. Typ. Max.
3.0 4.0 0 0 0 5.25 5.25 5.0 VTERM 70
Units
V V V V C
Signal Line Voltage Disconnect Input Voltage Operating Virtual Junction Temperature Range IMP5241 / 5242C Note 2. Range over which the device is functional.
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, these specifications apply over the operating ambient temperature range of 0C TA 70C, TermPwr = 4.75V. For the IMP5241 DISCONNECT = L, for the IMP5242 DISCONNECT = H. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.
Parameter LVD Terminator Section
TermPwr Supply Current Common Mode Voltage Offset Voltage Differential Terminator Impedance Common Mode Impedance Output Capacitance Output Leakage
Symbol
All term lines = Open
Test Conditions
IMP5241 / 5242 Min. Typ. Max.
25 5 1.25 112 105 200 2.5 32 25 1.375 125 110 300 2 1 40 115 1.2 5.0 1.3 1.4 15.0 200 10
Units
mA A V mV pF A A MHz ms V mA A A
IMP5241: DISCONNECT > 2.0V, IMP5242: DISCONNECT < 0.8V Open circuit between - and + (see Note 3) 1.125 100 100 100 IMP5241: DISCONNECT > 2.0V, IMP5242: DISCONNECT < 0.8V IMP5241: DISCONNECT > 2.0V, IMP5242: DISCONNECT < 0.8V, VLINE = 0 to 4V, TA = 25C IMP5241: DISCONNECT > 2.0V, IMP5242: DISCONNECT < 0.8V, VTERM = 0V, VLINE = 0V to 4V, TA = 25C Channel Bandwidth Mode Change Delay DIFFSENSE = 1.4V to 0V
DIFFSENSE Section
DIFFSENSE Output Voltage DIFFSENSE Output Source Current DIFFSENSE Sink Current DIFFSENSE Output Leakage VDIFF = 0V VDIFF = 2.75V IMP5241: DISCONNECT > 2.0V, IMP5242: DISCONNECT < 0.8V, TA = 25C All term lines = Open, Master/Slave = 0V All term lines = 0.2V, Master/Slave = 0V IMP5241: DISCONNECT > 2.0V, IMP5242: DISCONNECT < 0.8V Terminator Output High Volt Output Current Sink Current Output Capacitance Leakage Current VOUT = 0.2V VOUT = 4V, All lines IMP5241: DISCONNECT > 2.0V, IMP5242: DISCONNECT < 0.8V IMP5241: DISCONNECT > 2.0V, IMP5242: DISCONNECT < 0.8V, VOUT = 0 to 4V, TA = 25C IMP5241: DISCONNECT > 2.0V, IMP5242: DISCONNECT < 0.8V, VTERM = 0V, VLINE = 2.7V Note 3. Open circuit failsafe voltage. 2.6 21 35 2.85 23 65 2.5 9 214
Single-Ended Termination Section
Termpwr Supply Current 18 245 25 25 mA mA A V mA mA pF A A
2 1
3
ELECTRICAL CHARACTERISTICS Parameter Symbol Test Conditions IMP5241/42 Units Min. Typ. Max.
100 150 40 0.8 IMP5241 IMP5242 IMP5241 IMP5242 DISCONNECT DISCONNECT DISCONNECT DISCONNECT = = = = 0V 0V 4.75V 2.4V 0.8 MASTER / SLAVE = 0V MASTER / SLAVE = 4.75V 2.0 10 100 100 10 2.0 10 100 C MHz V A nA nA A V A nA
Single-Ended Termination Section (continued)
Ground Driver Impedance Thermal Shutdown Channel Bandwidth I = 2mA
DISCONNECT Section
DISCONNECT Thresholds Input Current
MASTER / SLAVE Section
MASTER / SLAVE Thresholds Input Current
4
BLOCK DIAGRAM
DISCONNECT
(-) RSE RLVD
(+) VBG RLVD Ground Driver
5
A P P L I C AT I O N S C H E M AT I C
5V
2.2F
TERM POWER
VTERM
HOST
PERIPHERAL
DIFFSENSE (1.3V)
TERM POWER DB (0) DB (0) + DB (7)DB (7)+
VTERM
2.2F
5V
DISCONNECT
DB (0) DB (0) + DB (7)DB (7)+
~~
DISCONNECT
IMP5241/2
IMP5241/2
TERMPWR
VTERM
DIFFSENSE ATN ATN + ACK ACK +
~~
DIFFSENSE
VTERM
TERMPWR
DISCONNECT
SCSI CABLE
ATN ATN + IMP5241/2 ACK ACK +
~~
DISCONNECT
IMP5241/2
Note: Single-ended the + signals become ground, DIFFSENSE < 0.5V.
6
~~
7
PACKAGE DIMENSIONS
DB
36-Pin Plastic (SSOP) Widebody S.O.I.C.
36 19
MILLIMETERS DIM MIN MAX A 2.14 2.54 B 0.29 0.51 C 0.23 0.32 D 15.20 15.40 E 7.40 7.60 F 0.80 BSC G 0.10 0.30 H 2.44 2.64 L 0.40 1.27 M 0 8 P 10.11 10.51 *LC -- 0.10 * Lead Coplanarity
I N C H ES MIN MAX 0.084 0.100 0.011 0.020 0.0091 0.0125 0.598 0.606 0.291 0.299 0.031 BSC 0.004 0.012 0.096 0.104 0.016 0.050 0 8 0.398 0.414 -- 0.004
E
1 18
P
D F A SEATING PLANE B G H L C E M
PWP
24-Pin Thin Small Shrink Outline (TSSOP)
EP
123
D F
AH SEATING PLANE B G L
E
DIM A B C D E F G H L M P *LC
M C
MILLIMETERS MIN MAX 0.80 1.05 0.19 0.30 0.09 0.20 7.70 7.90 4.30 4.5 0.65 BSC 0.05 0.15 -- 1.20 0.45 0.75 0 8 6.25 6.50 -- 0.10
INCHES MIN MAX .032 .041 0.007 0.012 0.0035 0.0079 0.303 0.311 0.169 0.176 0.025 BSC 0.002 0.005 -- 0.047 0.017 0.030 0 8 0.246 0.256 -- 0.004
* Lead Coplanarity
(R)
ISO 9001 Registered
IMP, Inc. Corporate Headquarters 2830 N. First Street San Jose, CA 95134 Tel: 408.432.9100 Main Tel: 800.438.3722 Fax: 408.434.0335 Fax-on-Demand: 800.249.1614 (USA) Fax-on-Demand: 303.575.6156 (International) e-mail: info@impinc.com http://www.impweb.com
The IMP logo is a registered trademark of IMP, Inc. All other company and product names are trademarks of their respective owners. (c) 1998 IMP, Inc. Part No.: IMP5241/42 Document Number: IMP5241/42-3-7/98
8

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