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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
18 Bit Switchable Active SCSI 2 Bus Terminator (110)
With Voltage Regulator and Inverted Disconnect
MCCS142238
The MCCS142238TM is a precision 18-bit switchable active SCSI-2 bus terminator with an on-board 2.85V regulator. When the Disconnect pin is HIGH according to the truth table below, the MCCS142238 provides 110 5% precision resistor pull-ups to a 2.85V reference for termination of 18-bits in a SCSI-2 standard bus system interface. When the Disconnect pin is LOW, the device outputs are in the high impedance state on all 18 bits. The regulator is also turned off, greatly reducing standby power. Even with no Termpwr applied, the outputs remain in the high impedance state.
18-BIT SWITCHABLE ACTIVE SCSI-2 BUS TERMINATOR
* * * * * * * * * * *
Complies With SCSI and SCSI-2 Standards Pin Compatible With UC5609 For Opposite Disconnect Polarity See Motorola's MCCS142236 18 Switchable 110 Terminating Resistors 4pF Channel Capacitance During Disconnect Fully Supports Active Negation (Sinks Minimum of 220mA) Built-In 2.85V Regulator With Low Dropout Voltage Very Low Supply Current When Resistors Are Disabled (150A Max) -650mA Source Current Thermal Shutdown Protection Thin Profile Surface Mount Package: 28-Lead SOIC
DW SUFFIX 28-LEAD WIDE SOIC PACKAGE CASE 751F-04
The regulator has a guaranteed dropout voltage of less than 900mV, allowing regulation of supply voltages less than 4.0V. The MCCS142238 is protected by thermal shutdown. Other features include low disconnect current (150A), over 220mA of active negation current sink capability, and 4pF disconnect capacitance. In 8-bit SCSI applications ("A" cable), only one MCCS142238 is needed at each end of the SCSI cable in order to terminate the 18 active signal lines. For information on "Power Dissipation for Active SCSI Terminators," refer to Motorola Application Note AN1408/D, available through the Motorola Design-NET Fax System as "HOT-DOC" Number 1083, or through the Motorola Literature Distribution Center.
TRUTH TABLE Disconnect 0 1 Output Z Terminated
MCCS and Mfax are trademarks of Motorola, Inc. 1/97
(c) Motorola, Inc. 1997
1
REV 2
MCCS142238
Disconnect Line1 Line2 Line3 Line4 Line5 GND GND GND Line6 Line7 Line8 Line9 Termpwr
1 2 3 4 5 6 7 8 9 10 11 12 13 14
28 27 26 25 24 23
GND Line18 Line17 Line16 Line15 Line14 GND GND GND Line13 Line12 Line11 Line10 Reg
MCCS142238
22 21 20 19 18 17 16 15
Figure 1. 28-Lead Pinout (Top View)
Disconnect Input Application A. No Connection to Disconnect B. Single Pole Switch to GND
Result Disconnect input will be pulled "HIGH" internally, providing 110 impedance to each of the bus lines. Disconnect input will be pulled "HIGH" internally when the switch is open, providing 110 impedance to each of the bus lines. Disconnect input will be held "LOW" when the switch is closed, causing all outputs to be high impedance. This is a more expensive way to accomplish application B above. It is more economical to allow the internal pullup to provide the "HIGH" input level. The supply source in this case could be Termpwr or VCC. The MCCS142238 will be permanently connected providing 110 impedance to each of the bus lines. The MCCS142238 will be permanently disconnected causing all outputs to be high impedance.
C. Double Pole Switch Between Supply and GND D. Hardwired "High" E. Hardwired "Low"
MAXIMUM RATINGS*
Symbol Termpwr VLine IREG DC Supply Voltage Signal Line Voltage Regulator Current Parameter Value 7.0 -1.0 to +7.0 1 Unit V V A
tstg Storage Temperature Range -65 to +150 C * Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended Operating Conditions.
MOTOROLA
2
SCSI TERMINATORS BR1486
MCCS142238
RECOMMENDED OPERATING CONDITIONS
Symbol Termpwr Vin VLine TA tr, tf DC Supply Voltage DC Input Voltage (Disconnect Pin) Signal Line Voltage Operating Temperature Range Input Rise/Fall Time Parameter Min 3.8 0 0 0 0 Max 5.25 Termpwr 3.0 +70 500 Unit V V V C ns
ELECTRICAL CHARACTERISTICS
Symbol Supply Current Section ITermpwr Ipd Termpwr Supply Current Power Down Mode Current Characteristic
(Unless otherwise stated, these specifications apply for TA = 0 to 70C, Termpwr = 4.75V, Disconnect = Open)
Min Typ Max Unit Condition
15 410 100
27 465 150
mA A
All Termination Lines = Open All Termination Lines = 0.5V Disconnect = 0V
Output Section (Termination Lines) R110 VOH Isource IOZ CO Termination Impedance Output HIGH Voltage Source Current Capability per Line Output Leakage Current Signal Lines = 0 to 5.25V Output Capacitance (Note 2.) 4.0 104.5 2.8 -19.9 110.0 2.85 115.5 3.0 -24 1 5.0 V mA A pF Note 1. Signal Line = 0.5V Termpwr = 5.25V, Reg = Open, Disconnect = 0V Disconnect = 0V
Regulator Section VReg Linereg Loadreg VDO ILim Isink Tshut Regulator Voltage Line Regulation Load Regulation Drop Out Voltage Current Limit Current Sink Capability Thermal Shutdown -450 220 2.8 2.85 27 35 0.7 -650 350 150 3.0 40 60 0.9 -850 400 V mV mV V mA mA C Signal Lines = 0V or 4V Signal Lines Open, Termpwr = 4V to 6V Signal Lines = 0V to 3V Signal Lines = 0.5V Reg = 0V Reg = 3.5V
Disconnect Section DTH Disconnect Threshold (Note 2.) 1.1 1.3 90 1.7 120 V A Disconnect = 0V
IIL Input Leakage Current 1. Measured with one output high and all other signal lines open. 2. Not production tested, guaranteed by design.
AC CHARACTERISTICS (Note 3., Reg = 2.85, CL = 2.2F, tr = tf = 6ns)
Symbol t(connect) t(disconnect) Parameters Max Connect Time, High Impedance to Termination, Disconnect to Outputs Max Disconnect Time, Termination to High Impedance, Disconnect to Outputs 0C to + 70C 100 20 Unit s s
3. Not production tested, guaranteed by design.
SCSI TERMINATORS BR1486
3
MOTOROLA
MCCS142238
Termpwr Reg 110 Shunt Control Line 1
+ -
Thermal Shutdown
50k
Voltage Reference 110 Line 18
Disconnect
Enable Logic
Charge Pump
PATENTED CIRCUIT DESIGN
Figure 2. MCCS142238 Block Diagram
2.2F Termpwr Reg Disconnect 2.2F
2.2F Termpwr Reg 2.2F Disconnect 0.1F
MCCS142238
Line 18 TO RECEIVERS BUS DRIVER Line 1
0.1F
MCCS142238
Line 1 Line 18 TO RECEIVERS BUS DRIVER
TO RECEIVERS BUS DRIVER BUS DRIVER
TO RECEIVERS
SCSI CABLE
Figure 3. Typical SCSI Bus Configuration Using the MCCS142238
30 Reg
Terminated 80 Output High Impedance
4pF
Figure 4. Output Impedance Model
MOTOROLA
4
SCSI TERMINATORS BR1486
MCCS142238
OUTLINE DIMENSIONS
DW SUFFIX PLASTIC SOIC PACKAGE CASE 751F-04 ISSUE E
-A28 15 NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSION A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.13 (0.005) TOTAL IN EXCESS OF D DIMENSION AT MAXIMUM MATERIAL CONDITION. DIM A B C D F G J K M P R MILLIMETERS MIN MAX 17.80 18.05 7.60 7.40 2.65 2.35 0.49 0.35 0.90 0.41 1.27 BSC 0.32 0.23 0.29 0.13 8 0 10.05 10.55 0.25 0.75 INCHES MIN MAX 0.701 0.711 0.292 0.299 0.093 0.104 0.014 0.019 0.016 0.035 0.050 BSC 0.009 0.013 0.005 0.011 0 8 0.395 0.415 0.010 0.029
-B1 14
P 14 PL 0.010 (0.25)
M
B
M
D 28 PL M R X 45
-TG 26 PL 0.010 (0.25)
M
C -TK TA
S SEATING PLANE
F J
B
S
Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. "Typical" parameters which may be provided in Motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer. How to reach us: USA / EUROPE / Locations Not Listed: Motorola Literature Distribution; P.O. Box 5405; Denver, Colorado 80217. 303-675-2140 or 1-800-441-2447 MfaxTM: RMFAX0@email.sps.mot.com - TOUCHTONE 602-244-6609 INTERNET: http://Design-NET.com
JAPAN: Nippon Motorola Ltd.; Tatsumi-SPD-JLDC, 6F Seibu-Butsuryu-Center, 3-14-2 Tatsumi Koto-Ku, Tokyo 135, Japan. 81-3-3521-8315 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852-26629298
SCSI TERMINATORS BR1486 5
MCCS142238/D MOTOROLA

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