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9-Line SCSI Terminator
ISO 9001 Registered
IMP5 1 29
DESCRIPTION
The IMP5219 SCSI 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 IMP5219 lies in its ability to insure reliable, error-free communications even in systems which do not adhere to recommended SCSI hardware design 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 IMP5219 architecture is much more tolerant of marginal system integrations. Recognizing the needs of portable and configurable peripherals, the IMP5219 has an active high TTL compatible sleep/disable mode. 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 sleep-mode feature. Additionally, the disable function permits factory-floor or production-line configurability, reducing inventory and product-line diversity costs. Field configurability can also be accomplished without physically removing components which results in field returns due to mishandling. Reduced component count is also inherent in the IMP5219 architecture. Traditional termination techniques require large stabilization and transient protection capacitors of up to 20F in value and size. The IMP5219 architecture does not require these components, allowing all the cost savings associated with reduced inventory, board space, and assembly, plus higher reliability. See the IMP5218 for a 9-channel Plug and Play SCSI terminator.
KEY FEATURES
s ULTRA-FAST RESPONSE FOR FAST-20 SCSI APPLICATIONS s HOT SWAP COMPATIBLE s 35MHz CHANNEL BANDWIDTH s 3.5V OPERATION s LESS THAN 3pF OUTPUT CAPACITANCE s SLEEP-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
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 IMP5219 LX5268 or
Driver IMP 5219 LX5268
PACKAGE ORDER INFORMATION TJ (C) 0 to 125
DW Plastic SOWB
16-pin
IMP5219CDW
PW Plastic TSSOP
20-pin
IMP5219CPW
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. IMP5219CDWT)
1
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PACKAGE PIN OUTS
1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9
Continuous Termination Voltage ................................................................................. T E R M I N A T O R U L T R A 9 - C H A N N E L S C S I 10V TERM POWER Continuous Output Voltage Range ...................................................................... 0 to 5.5V N.C. Continuous Disable Voltage Range ...................................................................... 0 to 5.5V D0 Operating Junction Temperature .................................................................... 0C to 125C D1 Storage Temperature Range ...................................................................... -65C to +150C D2 D3 Solder Temperature (Soldering, 10 seconds) .............................................................. 300C
Note 1. Exceeding these ratings could cause damage to the device.
D4 GND
TERM POWER N.C. DISABLE 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 DISABLE N.C. 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 Note 2. Range over which the device is functional.
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
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
IMP5219 Typ. Max.
2.85 6 215 375 -23 10 -90 10 3 35 60 9 225 -24
Units
V mA mA A mA nA A 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 Disable < 0.8V VOUT = 0.5V Disable = 4.75V Disable = 0V Disable = < 0.8V, 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
DISABLE PIN
1.4V 1 OF 9 CHANNELS
IMP5219
FUNCTIONAL DESCRIPTION
6mA and the device will respond to line demands by delivering Cable transmission theory suggests to optimize signal speed and 24mA on assertion and by imposing 2.85V on deassertion. In quality, the termination should act both as an ideal voltage order to disable the device, the Disable pin must be driven logic reference when the line is released (deasserted) and as an ideal Low. This mode of operation places the device in a sleep state current source when the line is active (asserted). Common active where a meager 275A of quiescent current is consumed. Additerminators, which consist of Linear Regulators in series with are in a Hi-Z resistors (typically 110), are a POWER UP / POWER DOWN FUNCTION TABLE tionally, all outputscan be used for (impedance) state. Sleep mode power compromise. As the line voltage conservation or to completely eliminate the increases, the amount of current Quiescent Disable Outputs terminator from the SCSI chain. In the second decreases linearly by the equation Current case, termination node capacitance is important V = I * R. The IMP5219, with its to consider. The terminator will appear as a unique new architecture applies the H Enabled 6mA parasitic distributed capacitance on the line, maximum amount of current L HI Z 375A which can detract from bus performance. For regardless of line voltage until the Open Enabled 6mA this reason, the IMP5219 has been optimized to termination high threshold (2.85V) have only 3pF of capacitance per output in the is reached. sleep state. Acting as a near ideal line terminator, the IMP5219 closely An additional feature of the IMP5219 is its compatibility with reproduces the optimum case when the device is enabled. To active negation drivers. The device handles up to 60mA of sink enable the device the Disable Pin must be pulled logic High or current for drivers which exceed the 2.85V output High. left Open. During this mode of operation, quiescent current is
3
GRAPH / CURVE INDEX
FIGURE INDEX
WaveformsT R A 9 - C H A N N E L S C S I T E R M I N A TApplication Circuits UL OR
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 # 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 (V = 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.)
Time - (250ns/Div.)
END-DRIVEN CABLE
Receiver Fig. 1A 6 Meter, 92 IMP5219 75C08
Driver Fig. 1B IMP5219 75C08
5
CHARACTERISTIC CURVES
U LT R A 9 - CH A N N E L S C S I T E R M I N AT O R
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.)
Time - (50ns/Div.)
END-DRIVEN CABLE
Receiver Fig. 2A 6 Meter, 92
IMP5219
Driver Fig. 2B
IMP5219
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.)
Time - (10ns/Div.)
END-DRIVEN CABLE
4.75V
IMP5219
1
6 Meter, 72
2
4.75V
IMP5219
LX5268
LX5268
3
7
CHARACTERISTIC CURVES
U LT R A 9 - CH A N N E L S C S I T E R M I N AT O R
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
FIGURE 10. -- TERMPWR SUPPLY CURRENT
500
vs. TERMINATION VOLTAGE (Disabled)
(ICC) TermPwr Supply Current - (mA)
6
(ICC) TermPwr Supply Current - (A)
3 3.5 4 4.5 5 5.5 6
450 400 350 300 250 200 150 100 50 0 0 1 2 3 4 5 6
5
4
3
2 1
0 2.5
(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)
4
(IOUT) Output Current - (mA)
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
U LT R A 9 - CH A N N E L S C S I T E R M I N AT O R
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
IMP5219
DB (6) DB (7) DB (P)
IMP5219 DB (6) DB (7) DB (P)
TERMPWR
VTERM
TERMPWR ATN BSY ACK RST MSG
~~
~~~
TERMPWR
VTERM
TERMPWR
DISCONNECT
DISCONNECT
SCSI CABLE
ATN BSY ACK RST MSG IMP5219
IMP5219
~~~
Note: Add third IMP5219 for 16-bit SCSI
DISCONNECT
DISCONNECT
DB (0) DB (1)
~~
DB (0) DB (1)
11
PACKAGE DIMENSIONS
U LT R A 9 - CH A N N E L S C S I T E R M I N AT O R
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.: IMP5219 Document Number: IMP5219-02-10/97
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