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ISO 9001 Registered
9-Line SCSI Terminator Plug and Play
KEY FEATURES
guidelines, such as the use of improper cable lengths and impedances. Frequently, this situation is not controlled by the peripheral or host designer and, when problems occur, they are the first to be made aware of the problem. The IMP5218 architecture is much more tolerant of marginal system integrations. The IMP5218 has two disconnect pins for SCSI Plug and Play (PnP) applications. Quiescent current is typically less than 275A in this mode, while the output capacitance is also less than 3pF. The obvious advantage of extended battery life for portable systems is inherent in the product's disable-mode feature. Additionally, the disable function permits factoryfloor or production-line configurability, reducing inventory and product-line diversity costs. Field configurability can also be accomplished without physically removing components which, often times results in field returns due to mishandling. Reduced component count is also inherent in the IMP5218 architecture. Traditional termination techniques require large stabilization and transient protection capacitors of up to 20F in value and size. The IMP5218 architecture does not require these components, allowing all the cost savings associated with reduced inventory, board space, and assembly, plus higher reliability.
s SCSI PLUG AND PLAY, DUAL LOW DISCONNECT, LOGIC LOW COMMAND DISCONNECTS ALL TERMINATION LINES s HOT SWAP COMPATIBLE s ULTRA-FAST RESPONSE FOR FAST-20 SCSI APPLICATIONS s 35MHz CHANNEL BANDWIDTH s 3.5V OPERATION s LESS THAN 3pF OUTPUT CAPACITANCE s DISABLE-MODE CURRENT LESS THAN 275A s THERMALLY SELF LIMITING s NO EXTERNAL COMPENSATION CAPACITORS s IMPLEMENTS 8-BIT OR 16-BIT (WIDE) APPLICATIONS s COMPATIBLE WITH ACTIVE NEGATION DRIVERS (60mA / CHANNEL) s COMPATIBLE WITH PASSIVE AND ACTIVE TERMINATIONS s APPROVED FOR USE WITH SCSI 1, 2, 3 AND ULTRASCSI
IMP5 1 28
DESCRIPTION
The IMP5218 terminator is part of IMP's SCSI terminator family of high-performance, adaptive, non-linear mode SCSI products, which are designed to deliver true UltraSCSI performance in SCSI applications. The low voltage BiCMOS architecture employed in its design offers performance superior to older linear passive and active techniques. IMP's SCSI terminator architecture employs high-speed adaptive elements for each channel, thereby providing the fastest response possible -- typically 35MHz, which is 100 times faster than the older linear regulator/terminator approach used by other manufacturers. Products using this older linear regulator approach have bandwidths which are dominated by the output capacitor and which are limited to 500KHz (see further discussion in the Functional Description section). This new architecture also eliminates the output compensation capacitor required in earlier terminator designs. Each is approved for use with SCSI-1, -2, -3, UltraSCSI and beyond -- providing the highest performance alternative available today. Another key improvement offered by the IMP5218 lies in its ability to insure reliable, error free communications even in systems which do not adhere to recommended SCSI hardware design
PRODUCT HIGHLIGHT
RE C E I V I N G WAV E F O R M - 20MH Z
D R I V I N G WAV E F O R M - 20MH Z
Receiver 1 Meter, AWG 28 IMP5218 LX5268 or
Driver IMP 5218 LX5268
PACKAGE ORDER INFORMATION TJ (C) 0 to 125
DW Plastic SOWB
16-pin
IMP5218CDW
PW Plastic TSSOP
20-pin
IMP5218CPW
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. IMP5218CDWT)
1
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PACKAGE PIN OUTS
TERM POWER N.C. D0 D1 D2 D3 D4 GND
1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9
Continuous Termination Voltage ................................................................................. 10V Continuous Output Voltage Range ...................................................................... 0 to 5.5V Continuous Disable Voltage Range ...................................................................... 0 to 5.5V Operating Junction Temperature .................................................................... 0C to 125C Storage Temperature Range ...................................................................... -65C to +150C Solder Temperature (Soldering, 10 seconds) .............................................................. 300C
Note 1. Exceeding these ratings could cause damage to the device.
TERM POWER DISC1 DISC2 D8 D7 D6 D5 GND
THERMAL DATA
DW PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, QJA .................................... 95C/W PW PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, QJA ................................... 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.
DW PACKAGE (Top View)
TERM POWER N.C. N.C. D0 D1 D2 D3 D4 N.C. GND
20 2 3 4 5 6 7 8 9 10 19 18 17 16 15 14 13 12 11
TERM POWER DISC1 DISC2 D8 D7 N.C. D6 D5 N.C. GND
PW PACKAGE (Top View)
RECOMMENDED OPERATING CONDITIONS (Note 2) Parameter
Termination Voltage High Level Disable Input Voltage Low Level Disable Input Voltage Operating Virtual Junction Temperature Range
Symbol
VTERM VIH VIL
Recommended Operating Conditions Min. Typ. Max.
3.5 2 0 0 5.5 VTERM 0.8 125
Units
V V V C
Note 2. Range over which the device is functional.
ELECTRICAL CHARACTERISTICS
Term Power = 4.75V unless otherwise specified. Unless otherwise specified, these specifications apply at the recommended operating ambient temperature of TA = 25C. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.
Parameter
Output High Voltage TermPwr Supply Current
Symbol
VOUT ICC
Test Conditions
Min.
2.65
IMP5218 Typ. Max.
2.85 6 215 275 -23 90 -10 10 3 35 60 9 225 -24
Units
V mA mA A mA A nA nA pF MHz mA
Output Current Disable Input Current Output Leakage Current Capacitance in Disabled Mode Channel Bandwidth Termination Sink Current, per Channel
IOUT IIN
COUT BW ISINK
All data lines = open All data lines = 0.5V DISC1 = DISC2 = 0V VOUT = 0.5V DISC1 = DISC2 = 4.75V DISC1 = DISC2 = 0V DISC1 = DISC2 = 0V, VO = 0.5V VOUT = 0V, frequency = 1MHz VOUT = 4V
-21
2
BLOCK DIAGRAM
TERM POWER
U LT R A 9 - C H A N N E L S C S I T E R M I N AT O R
CURRENT BIASING CIRCUIT
THERMAL LIMITING CIRCUIT
24mA CURRENT LIMITING CIRCUIT
DATA OUTPUT PIN DB(0)
2.85V
DISC1 DISC2
1 OF 9 CHANNELS
IMP5218
FUNCTIONAL DESCRIPTION
demands by delivering 24mA on assertion and by imposing 2.85V Cable transmission theory suggests to optimize signal speed and on deassertion. In order to disable the device, the DISC1 and quality, the termination should act both as an ideal voltage DISC2 pins must be driven logic Low. This mode of operation reference when the line is released (deasserted) and as an ideal places the device in a sleep state where a meager 275A of current source when the line is active (asserted). Common active quiescent current is consumed. Additionally, all outputs are in a terminators, which consist of Linear Regulators in series with Hi-Z (impedance) state. Sleep mode resistors (typically 110), are a POWER UP / POWER DOWN FUNCTION TABLE can be used for power conservation or compromise. As the line voltage to completely eliminate the terminaincreases, the amount of current Quiescent tor from the SCSI chain. In the decreases linearly by the equation V DISC1 DISC2 Outputs Current second case, termination node = I * R. The IMP5218, with its capacitance is important to consider. unique new architecture applies the H H Enabled 6mA The terminator will appear as a maximum amount of current H L Enabled 6mA parasitic distributed capacitance on regardless of line voltage until the the line, which can detract from bus termination high threshold (2.85V) L H Enabled 6mA performance. For this reason, the is reached. L L Disabled 275A IMP5218 has been optimized to have Acting as a near ideal line Open Open Enabled 6mA only 3pF of capacitance per output in terminator, the IMP5218 closely the sleep state. reproduces the optimum case when An additional feature of the IMP5218 is its compatibility with the device is enabled. To enable the device the DISC1 and active negation drivers. The device handles up to 60mA of sink DISC2 Pins must be pulled logic High, Open, or any combinacurrent for drivers which exceed the 2.85V output High. tion of both High and Low. During this mode of operation, quiescent current is 6mA and the device will respond to line
3
GRAPH / CURVE INDEX
FIGURE INDEX
Waveforms
FIGURE # 1A. RECEIVING WAVEFORM (Freq. = 1.0MHz) 1B. DRIVING WAVEFORM 2A. RECEIVING WAVEFORM (Freq. = 5.0MHz) 2B. DRIVING WAVEFORM 3. 4. 10MHz WAVEFORM 20MHz WAVEFORM FIGURE #
Application Circuits
16. 8-BIT SCSI SYSTEM APPLICATION
Characteristic Curves
FIGURE # 5. 6. 7. 8. 9. OUTPUT HIGH VOLTAGE vs. JUNCTION TEMPERATURE OUTPUT CURRENT vs. JUNCTION TEMPERATURE OUTPUT CURRENT vs. OUTPUT HIGH VOLTAGE (VT = 4.75V) OUTPUT CURRENT vs. OUTPUT HIGH VOLTAGE (VT = 3.3V) TERMINATION VOLTAGE vs. SUPPLY CURRENT
10. TERMPWR SUPPLY CURRENT vs. TERMINATION VOLTAGE (Disabled) 11. OUTPUT HIGH VOLTAGE vs. JUNCTION TEMPERATURE (VT = 3.3V) 12. OUTPUT CURRENT vs. JUCTION TEMPERATURE (VT = 3.3V) 13. OUTPUT HIGH VOLTAGE vs. TERMINATION VOLTAGE 14. OUTPUT CURRENT vs. TERMINATION VOLTAGE 15. OUTPUT CURRENT MATCHING CHANNEL TO CHANNEL
4
CHARACTERISTIC CURVES
U LT R A 9 - C H A N N E L S C S I T E R M I N AT O R
FIGURE 1A. -- RECEIVING WAVEFORM
3.5
FIGURE 1B. -- DRIVING WAVEFORM
3.5
freq.=1.03844MHz
3 2.5
3 2.5
freq.=1.00266MHz
Line Voltage - (V)
Line Voltage - (V)
2 1.5 1 0.5 GND -0.5
2 1.5 1 0.5 GND -0.5
Time - (250ns/Div.)
END-DRIVEN CABLE
Time - (250ns/Div.)
Receiver Fig. 1A 6 Meter, 92
IMP5218
Driver Fig. 1B
IMP5218
75C08
75C08
5
CHARACTERISTIC CURVES
FIGURE 2A. -- RECEIVING WAVEFORM
3.5
FIGURE 2B. -- DRIVING WAVEFORM
3.5
freq.=5.0092MHz
3 2.5
3 2.5
freq.=4.9961MHz
Line Voltage - (V)
Line Voltage - (V)
2 1.5 1 0.5 GND -0.5
2 1.5 1 0.5 GND -0.5
Time - (50ns/Div.)
END-DRIVEN CABLE
Time - (50ns/Div.)
Receiver Fig. 2A 6 Meter, 92
IMP5218
Driver Fig. 2B
IMP5218
75C08
75C08
6
CHARACTERISTIC CURVES
U LT R A 9 - C H A N N E L S C S I T E R M I N AT O R
FIGURE 3. -- 10MHz WAVEFORM
4 Ch2 Freq.=10.096MHz 3 2
3 2
FIGURE 4. -- 20MHz WAVEFORM
4 Ch2 Freq.=20.020MHz
#1
#2
Line Voltage - (V)
1
Line Voltage - (V)
#2 #1
0
1 0 4
#3
4
#3
GND
GND
Time - (20ns/Div.)
END-DRIVEN CABLE
Time - (10ns/Div.)
4.75V
IMP5218
1
6 Meter, 72
2
4.75V
IMP5218
LX5268
LX5268
3
7
CHARACTERISTIC CURVES
FIGURE 5. -- OUTPUT HIGH VOLTAGE vs. JUNCTION TEMP.
4.5
FIGURE 6. -- OUTPUT CURRENT vs. JUNCTION TEMP.
30
(VOUT) Output High Voltage - (V)
3.5
(IOUT) Output Current - (mA)
4
25
20
3
15
2.5
10
VT = 4.75V
2 0 25 50 75 100 125 5 0 25 50 75 100 125
(TJ) Junction Temperature - (C)
(TJ) Junction Temperature - (C)
FIGURE 7. -- OUTPUT CURRENT vs. OUTPUT HIGH VOLTAGE
25
FIGURE 8. -- OUTPUT CURRENT vs. OUTPUT HIGH VOLTAGE
25
VT = 4.75V TA = 25C
VT = 3.3V TA = 25C
(IOUT) Output Current - (mA)
15
(IOUT) Output Current - (mA)
0.4
20
20
15
10
10
5
5
0 0 0.8 1.2 1.6 2 2.4 2.8 3.2
0 0 0.4 0.8 1.2 1.6 2 2.4 2.8 3.2
(VOUT) Output High Voltage - (V)
(VOUT) Output High Voltage - (V)
8
CHARACTERISTIC CURVES
U LT R A 9 - C H A N N E L S C S I T E R M I N AT O R
FIGURE 9. -- TERMPWR SUPPLY CURRENT
vs. TERMINATION VOLTAGE
7 400
FIGURE 10. -- TERMPWR SUPPLY CURRENT vs.
TERMINATION VOLTAGE (Disabled)
(ICC) TermPwr Supply Current - (mA)
6
(ICC) TermPwr Supply Current - (A)
3.5
350 300 250 200 150 100 50 0
5
4
3
2 1
0 2.5
3
4
4.5
5
5.5
6
0
1
2
3
4
5
6
(VTERM) Termination Voltage - (V)
(VTERM) Termination Voltage - (V)
FIGURE 11. -- OUTPUT HIGH VOLTAGE vs. JUNCTION TEMP.
4.5
FIGURE 12. -- OUTPUT CURRENT vs. JUNCTION TEMP.
30
VT = 3.3V
VT = 3.3V
(VOUT) Output High Voltage - (V)
(IOUT) Output Current - (mA)
4
25
3.5
20
3
15
2.5
10
2 0 25 50 75 100 125
5 0 25 50 75 100 125
(TJ) Junction Temperature - (C)
(TJ) Junction Temperature - (C)
9
CHARACTERISTIC CURVES
FIGURE 13. -- OUTPUT HIGH VOLTAGE
vs. TERMINATION VOLTAGE
4 3.5 3 2.5 2 1.5 1 0.5 0 3 3.5 4 4.5 5 5.5 6
FIGURE 14. -- OUTPUT CURRENT vs. TERMINATION VOLTAGE
25
(VOUT) Output High Voltage - (V)
(VOUT) Output High Voltage - (V)
20
15
10
5
0 3 3.5 4 4.5 5 5.5 6
(VTERM) Termination Voltage - (V)
(VTERM) Termination Voltage - (V)
10
CHARACTERISTIC CURVES
U L R -- OUTPUT CURRENT S C S I T CHANNEL MATCHING FIGURET16. A 9 - C H A N N E L CHANNEL TO E R M I N A T O R
24
23.5
23
Io (mA)
22.5
22
23.5 - 24 23 - 23.5 22.5 - 23 22 - 22.5 21.5 - 22 21 - 21.5
21.5 i6 21 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 i0 Part # 21 22 23 24 25 i2 i4
i8
Channel
APPLICATION SCHEMATIC
FIGURE 17 -- 8-BIT SCSI SYSTEM APPLICATION
5V
2.2F
TERM POWER
VTERM
HOST
PERIPHERAL
TERM POWER
VTERM
2.2F
5V
DISC1 DISC2
DB (0) DB (1) DB (6) DB (7) DB (P)
~~
DB (0) DB (1) IMP5218 DB (6) DB (7) DB (P)
IMP5218
DISC1 DISC2
TERMPWR
VTERM
TERMPWR ATN BSY ACK RST MSG
~~
~~~
TERMPWR
VTERM
TERMPWR
DISC1 DISC2
SCSI CABLE
ATN BSY ACK RST MSG IMP5218
IMP5218
~~~
DISC1 DISC2
Note: Add third IMP5218 for 16-bit SCSI
11
PACKAGE DIMENSIONS
DW
16-Pin Plastic (SOWB) Widebody S.O.I.C.
16
A
9
B
1 8
P
F
G
D L C M
SEATING PLANE
K
MILLIMETERS D I M MIN MAX A -- 10.67 B 7.49 7.75 C 2.35 2.65 D 0.25 0.46 F 0.64 0.89 G 1.27 BSC J 0.23 0.32 K 0.10 0.30 L 8.13 8.64 M 0 8 P 10.26 10.65
INCHES MIN MAX -- 0.420 0.295 0.305 0.093 0.104 0.010 0.018 0.025 0.035 0.050 BSC 0.009 0.013 0.004 0.012 0.320 0.340 0 8 0.404 0.419
* See NOTE: 1
J
PWP 20-Pin Thin Small Shrink Outline (TSSOP)
321
EP
D F AH SEATING PLANE B G L
E
C
M
DIM A B C D E F G H L M P
MILLIMETERS MIN MAX -- 0.90 0.18 0.30 0.90 0.180 6.40 6.60 4.30 4.48 0.65 BSC 0.05 0.15 -- 1.10 0.50 0.70 0 8 6.25 6.50
INCHES MIN MAX -- 0.354 0.0071 0.0118 0.0035 0.0071 0.252 0.260 0.169 0.176 0.025 BSC 0.002 0.005 -- 0.0433 0.020 0.028 0 8 0.246 0.256
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) 1997 IMP, Inc. Printed in USA Part No.: IMP5218 Document Number: IMP5218-02-10/97
12

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