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| MOTOROLA SEMICONDUCTOR TECHNICAL DATA 9-Bit Switchable Active SCSI-2 Bus Terminator (110) With Voltage Regulator The MCCS142237TM is a precision 9-bit switchable active SCSI-2 bus terminator with an on-board 2.85V regulator. The SCSI-2 standard recommends the use of active terminations at both ends of every cable segment in a SCSI system with single-ended drivers and receivers. The MCCS142237 enables the designer to gain the benefits of active termination: greater immunity to voltage drops on the TERMPWR (TERMination PoWeR) line, enhanced high-level immunity, intrinsic TERMPWR decoupling, and very low quiescent current consumption. When the device is enabled (PD = HIGH), the MCCS142237 provides 110 precision resistor pull-ups to a 2.85V reference for termination of 9-bits in a SCSI-2 standard bus system interface. When PD is LOW, the device is in the High Impedance State on all 9 bits. MCCS142237 9-BIT SWITCHABLE ACTIVE SCSI-2 BUS TERMINATOR * * * * * * * * * * * Complies With SCSI and SCSI-2 Standards Pin Compatible With DS2107, DS2107A and DS21S07A 9 Switchable 110 Terminating Resistors Power-Down Mode Disengages Terminating Resistors Built-In 2.85V Regulator Guaranteed Maximum 1.0V Dropout Voltage 3pF Channel Capacitance During "Power-Down" Thermal Shutdown Circuitry Fully Supports Active Negation SCSI Signals Regulator Short Circuit Protection Thin Profile 20-Pin TSSOP and 16-Pin SOIC Packages TRUTH TABLE PD Output DT SUFFIX 20-LEAD PLASTIC TSSOP PACKAGE CASE 948D-03 DW SUFFIX 16-LEAD WIDE SOIC PACKAGE CASE 751G-02 The regulator has a dropout voltage of less than 1.0V, allowing regulation of input voltages less than 4.0V. Internal protective features include thermal shutdown. The regulator produces a 2.85V level and is capable of sourcing 24mA 0 Z into each of the termination resistors when the signal line is low (asserted). When the driver for a given signal line turns off, the terminator 1 Terminated will pull the signal line to 2.85V (quiescent state). To handle actively negated SCSI signals, the regulator can sink over 220mA. When the Power-Down pin (PD) is LOW, the power-down circuitry will turn off the transistors on each signal line. This isolates the MCCS142237 from the signal lines and effectively removes it from the bus. The PD pin has an internal pull-up resistor. To place the terminator into the active state, the PD pin should either be left open circuited or tied HIGH. To ensure proper operation, both the TERMPWR1 and TERMPWR2 pins must be connected to the SCSI bus TERMPWR line and both the VREF1 and VREF2 pins must be tied together externally. Each MCCS142237 requires a minimum 2.2F capacitor connected between the VREF pins and ground. In 8-bit SCSI applications ("A" cable), two MCCS142237s are needed at each end of the SCSI cable in order to terminate the 18 active signal lines. In 16-bit WIDE SCSI applications ("P" cable), three MCCS142237s would be needed at each end of the SCSI cable in order to terminate the 27 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, or through the Motorola Literature Distribution Center. MCCS and Mfax are trademarks of Motorola, Inc. 1/97 (c) Motorola, Inc. 1997 1 REV 5 MCCS142237 TERMPWR1 1 HS-GND 2 R1 3 R2 4 R3 5 R4 6 R5 7 HS-GND 8 VREF1 9 GND 10 20 PD 19 VREF2 18 HS-GND 17 NC 16 R9 15 R8 14 R7 13 R6 12 HS-GND 11 TERMPWR2 TERMPWR1 1 R1 2 R2 3 R3 4 R4 5 R5 6 VREF1 7 GND 8 16 PD 15 VREF2 14 NC 13 R9 12 R8 11 R7 10 R6 9 TERMPWR2 Figure 1. 20-Lead Pinout (Top View) PIN DESCRIPTIONS Symbol TERMPWR1 R1 R2 R3 R4 R5 VREF1 GND TERMPWR2 R6 R7 R8 R9 NC VREF2 PD 20-Lead TSSOP 1 3 4 5 6 7 9 10 11 13 14 15 16 17 19 20 16-Lead SOIC 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Figure 2. 16-Lead Pinout (Top View) Description Termination Power 1. Connect to the SCSI TERMPWR line. See Figure 4. Signal Termination 1. 110 ohm termination. Signal Termination 2. 110 ohm termination. Signal Termination 3. 110 ohm termination. Signal Termination 4. 110 ohm termination. Signal Termination 5. 110 ohm termination. Reference Voltage 1. Must be externally connected directly to the VREF2 pin. See Figure 4. Ground. Signal ground; 0.0V. Termination Power 2. Should be connected to the SCSI TERMPWR line. See Figure 4. Signal Termination 6. 110 ohm termination. Signal Termination 7. 110 ohm termination. Signal Termination 8. 110 ohm termination. Signal Termination 9. 110 ohm termination. No Connect. Do not connect any signal to this pin. Reference Voltage 2. Must be externally connected directly to the VREF1 pin. See Figure 4. Power Down. When tied low, the MCCS142237 enters power- down mode. Contains an internal 50k pull-up. Tie low to de-activate the MCCS142237, leave open circuited or tie high to activate the MCCS142237. Heat Sink Ground. HS-GND 2,8,12,18 N/A PD Input Application A. No Connection to PD B. Single Pole Switch to GND Result PD input will be pulled "HIGH" internally. This connects the termination resistors. PD input will be pulled "HIGH" internally when the switch is open, which connects the termination resistors. PD input will be held "LOW" when the switch is closed, disconnecting the termination resistors and turning off the voltage regulator. The MCCS142237 will be permanently connected and provide termination on all outputs. The MCCS142237 will be permanently disconnected. C. Hardwired "High" D. Hardwired "Low" MOTOROLA 2 SCSI TERMINATORS BR1486 MCCS142237 MAXIMUM RATINGS* Symbol TERMPWR VLine IReg tstg VREF DC Supply Voltage Voltage on Any Pin Relative to Ground Regulator Output Current Storage Temperature Range Reference Voltage Parameter Value 7.0 -1.0 to +7.0 0.5 -65 to +150 5.0 Unit V V A C V * Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended Operating Conditions. RECOMMENDED OPERATING CONDITIONS (0 to 70C) Symbol VTP VPDA VPDI VLine TA TERMPWR Voltage PD Active PD Inactive Signal Line Voltage Operating Temperature Range 2.0 0 0 Parameter Min 3.9 Max 5.25 0.8 VTP + 0.3 3.0 70 Unit V V V V C DC CHARACTERISTICS (0 to 70C) Symbol ITP IPD RTERM TSD CPD HPD IIH IIL Characteristic TERMPWR Current 5 Power-Down Current Termination Resistance Die Thermal Shutdown Power-Down Termination Capacitance PD Hysteresis Input Leakage HIGH Input Leakage LOW -1.0 1.0 104.5 100 110 150 3 280 4.5 115.5 Min Typ Max 250 10 Unit mA A C pF mV A A Condition 4V < TERMPWR < 5.25V (Note 1.) 4V < TERMPWR < 5.25V (Note 2.) 4V < TERMPWR < 5.25V (Note 4.) 4V < TERMPWR < 5.25V 4V < TERMPWR < 5.25V 4V < TERMPWR < 5.25V (Notes 3., 4.) 4V < TERMPWR < 5.25V 4V < TERMPWR < 5.25V (Notes 4., 5.) 4V < TERMPWR < 5.25V (Notes 4., 5.) 1. All signal lines = 0.0V 2. All signal lines open 3. Guaranteed by characterization; not production tested 4. PD = 0.0V 5. Resistors Only REGULATOR CHARACTERISTICS (0 to 70C) Symbol VREF VDROP LIReg LOReg ILim ISink Characteristic Reference Voltage Drop Out Voltage Line Regulation Load Regulation Current Limit Sink Current -300 220 Min 2.79 Typ 2.85 0.75 <1.0 <1.0 -350 300 Max 2.91 1.00 2.0 3.0 -400 400 Unit V V % % mA mA Condition 4V < TERMPWR < 5.25V (Notes 6., 8.) Notes 6., 7. 4V < TERMPWR < 5.25V (Note 8.) 4V < TERMPWR < 5.25V 4V < TERMPWR < 5.25V (Note 9.) 4V < TERMPWR < 5.25V (Note 10.) 6. All signal lines = 0.0V 7. Guaranteed by design; not production tested 8. All signal lines open 9. VREF pins = 0V 10. VREF pins = 3.5V SCSI TERMINATORS BR1486 3 MOTOROLA MCCS142237 TERMPWR VREF 110 Shunt Control + - 50k Thermal Shutdown 110 R9 Enable Logic Charge Pump Voltage Reference R1 PD CIRCUIT DESIGN PATENT PENDING Figure 3. MCCS142237 Block Diagram TERMINATION POWER LINE 2.2F TERMPWR1 TERMPWR2 VREF1 VREF2 2.2F TERMPWR1 TERMPWR2 VREF1 VREF2 2.2F MCCS142237 GND R1 R9 2.2F MCCS142237 GND R9 R1 TO RECEIVERS TO RECEIVERS BUS DRIVER BUS DRIVER TO RECEIVERS TO RECEIVERS BUS DRIVER SCSI CABLE BUS DRIVER Figure 4. Typical SCSI Bus Configuration Using the MCCS142237 MOTOROLA 4 SCSI TERMINATORS BR1486 MCCS142237 30 VREF Terminated 80 Output High Impedance 3pF Figure 5. Output Impedance Model AC CHARACTERISTICS (VREF = 2.85, CL = 50pF, tr = tf = 6ns) Symbol t(connect) Parameters Max Enable Time, High Impedance to Termination, PD to Outputs Max Disable Time, Termination to High Impedance, PD to Outputs 0C to + 70C 100 Unit s Per Truth Table Condition t(disconnect) 20 s Per Truth Table SCSI TERMINATORS BR1486 5 MOTOROLA MCCS142237 OUTLINE DIMENSIONS DW SUFFIX PLASTIC SOIC PACKAGE CASE 751G-02 ISSUE A -B - 1 8 -A - 16 9 P 8 PL 0.25 (0.010) M B M G 14 PL J NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSIONS 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 10.15 10.45 7.60 7.40 2.65 2.35 0.49 0.35 0.90 0.50 1.27 BSC 0.32 0.25 0.25 0.10 7 0 10.05 10.55 0.25 0.75 INCHES MIN MAX 0.400 0.411 0.292 0.299 0.093 0.104 0.014 0.019 0.020 0.035 0.050 BSC 0.010 0.012 0.004 0.009 0 7 0.395 0.415 0.010 0.029 F C -T D 16 PL 0.25 (0.010) K M SEATING - PLANE R X 45 T A S B S M A DT SUFFIX PLASTIC TSSOP PACKAGE CASE 948D-03 ISSUE B 20X K REF 0.200 (0.004) M T 20 11 L PIN 1 IDENTIFICATION 1 10 B C -U0.100 (0.004) -TSEATING PLANE NOTES: 1 DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2 CONTROLLING DIMENSION: MILLIMETER. 3 DIMENSION A DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH OR GATE BURRS SHALL NOT EXCEED 0.15 (0.006) PER SIDE. 4 DIMENSION B DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSION. INTERLEAD FLASH OR PROTRUSION SHALL NOT EXCEED 0.25 (0.010) PER SIDE. 5 DIMENSION K DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.08 (0.003) TOTAL IN EXCESS OF THE K DIMENSION AT MAXIMUM MATERIAL CONDITION. 6 TERMINAL NUMBERS ARE SHOWN FOR REFERENCE ONLY. 7 DIMENSIONS A AND B ARE TO BE DETERMINED AT DATUM PLANE -U-. MILLIMETERS MIN MAX --- 6.60 4.30 4.50 --- 1.20 0.05 0.25 0.45 0.55 0.65 BSC 0.275 0.375 0.09 0.24 0.09 0.18 0.16 0.32 0.16 0.26 6.30 6.50 0 10 INCHES MIN MAX --- 0.260 0.169 0.177 --- 0.047 0.002 0.010 0.018 0.022 0.026 BSC 0.011 0.015 0.004 0.009 0.004 0.007 0.006 0.013 0.006 0.010 0.248 0.256 0 10 D G H K J1 J SECTION A-A A F K1 A M DIM A B C D F G H J J1 K K1 L M MOTOROLA 6 SCSI TERMINATORS BR1486 MCCS142237 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 7 MCCS142237/D MOTOROLA |
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