LIN D O C #: 5203 LX5203 9 - L I N E SCSI A C T I V E T E R M I N AT O R T H E I N F I N I T E P O W E R O F I P N N O VA T I O N R O D U C T I O N DESCRIPTION The LX5203 is a nine-line active terminator for the SCSI parallel bus. This SCSI standard recommends active termination at both ends of the SCSI bus. During disconnect mode, the LX5203 requires a meager 60µA of supply current, while offering only 6pF of output capacitance. To enter this low-power mode, the disconnect pin can be left open (floating) or driven high, thereby disconnecting the terminating resistors and placing the internal low dropout regulator into low-power mode. In disconnect mode each termination line presents a high impedance to the SCSI bus with the overall effect being to preserve high signal integrity and yield subsequent reliable, error-free communications. During normal operation, the LX5203 con- D A T A S H E E T K E Y F E AT U R E S sumes only 600µA of current. Linfinity's proprietary BiCMOS low dropout regulator architecture enables oscillation-free operation with minimal output capacitance. Linfinity recommends a minimum stabilization capacitor value of 2.2µF. The LX5203 also offers a precisely trimmed channel output current specified to a 5% tolerance. The maximum value of the output current is trimmed as closely as possible to the SCSI standard maximum specification to give the highest possible noise margin for fast SCSI operation. And the LX5203 sinks up to 150mA of current making it compatible with today's fast active negation drivers. The LX5203 is a superior, pin-for-pin replacement for a variety of industry products such as the UC5603 and UC5613. ■ 6pF OUTPUT CAPACITANCE DURING DISCONNECT ■ 60µA SUPPLY CURRENT IN DISCONNECT MODE ■ 600µA SUPPLY CURRENT DURING NORMAL OPERATION ■ 150mA SINK CURRENT FOR ACTIVE NEGATION ■ LOGIC COMMAND DISCONNECTS ALL TERMINATION LINES ■ CURRENT LIMIT AND THERMAL PROTECTION ■ COMPATIBLE WITH SCSI 1, 2 AND 3 STANDARDS ■ CONSULT FACTORY FOR APPLICATION TEST REPORT: 5203TR IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com. PRODUCT HIGHLIGHT R E C E I V I N G W AV E F O R M - 5 M H Z D R I V I N G W AV E F O R M - 5MH Z Driver Receiver 1 Meter, AWG 28 LX5203 LX5203 LX5268 LX5268 PA C K A G E O R D E R I N F O R M AT I O N TA (°C) 0 to 70 DIP N Plastic 16-pin LX5203CN NOTE: For An In-Depth Discussion On Applying SCSI, Request Linfinity Application Note: "Understanding The Single-Ended SCSI Bus" SOIC DP Plastic 16-pin, Power LX5203CDP Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX5203CDPT) Copyright © 1997 Rev. 1.9 7/97 LINFINITY MICROELECTRONICS INC. 11861 W ESTERN A VENUE, G ARDEN G ROVE, CA. 92841, 714-898-8121, F AX: 714-893-2570 1 PRODUCT DATABOOK 1996/1997 LX5203 9 - L I N E SCSI A C T I V E T E R M I N AT O R P R O D U C T I O N A B S O L U T E M A X I M U M R AT I N G S D A T A S H E E T PACKAGE PIN OUTS (Note 1) TermPwr Voltage ......................................................................................................... +7V Signal Line Voltage ............................................................................................ 0V to +7V Regulator Output Current ........................................................................................... 0.4A Operating Junction Temperature Plastic (N, DP Packages) ....................................................................................... 150°C Storage Temperature Range ...................................................................... -65°C to 150°C Lead Temperature (Soldering, 10 seconds) ............................................................. 300°C 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. T7 T8 T9 N.C. GND DISCONNECT T1 T2 1 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 T6 T5 REG OUT N.C. N.C. VTERM T4 T3 N PACKAGE (Top View) T H E R MAL DATA N PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ JA 65°C/W DP PACKAGE: THERMAL RESISTANCE-JUNCTION TO LEADS, θJL 20°C/W THERMAL RESISTANCE-JUNCTION TO AMBIENT, θ JA 45°C/W Junction Temperature Calculation: TJ = TA + (PD x θJA). The θ JA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow. T7 T8 T9 HEATSINK/GND GND DISCONNECT T1 T2 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 T6 T5 REG OUT HEATSINK/GND HEATSINK/GND VTERM T4 T3 DP PACKAGE (Top View) POWER UP / POWER DOWN FUNCTION TABLE 2 Disconnect Outputs Quiescent Current L H Open Enabled HI Z HI Z 600µA 60µA 60µA Copyright © 1997 Rev. 1.9 7/97 PRODUCT DATABOOK 1996/1997 LX5203 9 - L I N E SCSI A C T I V E T E R M I N AT O R P R O D U C T I O N D A T A S H E E T R E C O M M E N D E D O P E R AT I N G C O N D I T I O N S Parameter Symbol TermPwr Voltage Signal Line Voltage Disconnect Input Voltage Output Capacitor on REGOUT Operating Virtual Junction Temperature Range LX5203C (Note 2) Recommended Operating Conditions Min. Typ. Max. VTERM Units 4 0 0 2.2 5.25 5 VTERM V V V µF 0 125 °C Note 2. Range over which the device is functional. ELECTRICAL CHARACTERISTICS (Unless otherwise specified, these specifications apply over the operating ambient temperature range of 0°C ≤ T A ≤ 70°C. TermPwr = 4.75V, Disconnect = 0V. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.) Parameter Symbol Test Conditions Min. LX5203 Typ. Max. Units Supply Current Section TermPwr Supply Current Power Down Mode All term lines = Open All term lines = 0.5V Disconnect = Open 0.6 194 60 1.2 208 100 mA mA µA 110 110 2.9 -21.8 -21.8 -21.8 -21.8 10 6 30 116 120 Ω Ω V mA mA mA mA nA pF mA Output Section (Terminator Lines) Terminator Impedance Terminator Output High Voltage Max. Output Current Output Leakage Output Capacitance Sink Current ITERM = -5mA to -15mA, TA = 25°C ITERM = -5mA to -15mA VOUT = 0.5V, T A = 25°C VOUT = 0.5V, 0°C ≤ TA ≤ 70°C VOUT = 0.5V, V TERM = 4V, TA = 25°C VOUT = 0.5V, V TERM = 4V, 0°C ≤ TA ≤ 70°C Disconnect = Open, VTERM = 0V to 5.25V Disconnect = Open VOUT = 4V 104 100 2.7 -20.3 -19.0 -19.5 -18.0 20 -23 -23 -23 -23 400 Regulator Section Regulator Output Voltage Line Regulation Load Regulation Drop Out Voltage Short Circuit Current Thermal Shutdown 3.6 10 20 0.7 -200 150 VTERM = 4V to 6V I REG = 0 to -50mA IREG = -50mA VREG = 0V 20 50 1.0 -350 V mV mV V mA °C 2.0 40 V µA Disconnect Section Disconnect Threshold Input Current Copyright © 1997 Rev. 1.9 7/97 0.8 Disconnect = 0V 3 PRODUCT DATABOOK 1996/1997 LX5203 9 - L I N E SCSI A C T I V E T E R M I N AT O R P R O D U C T I O N D A T A S H E E T BLOCK DIAGRAM FIGURE 1 — LX5203 BLOCK DIAGRAM REG OUT VTERM VTERM DISCONNECT Channel 1 of 9 VBG T0 VTERM T8 A P P L I C AT I O N S C H E M AT I C FIGURE 2 — 8-BIT SCSI SYSTEM APPLICATION TERM POWER DB (0) DB (1) DB (0) DB (1) 2.2µF DB (6) DB (7) DB (P) DB (6) DB (7) DB (P) REGOUT 2.2µF TERMPWR TERMPWR ACK RST MSG VTERM SCSI CABLE ATN BSY LX5203 REGOUT DISCONNECT ~ ~ ATN BSY ~ ~ ~ DISCONNECT VTERM 2.2µF 2.2µF LX5203 LX5203 REGOUT 5V DISCONNECT VTERM VTERM ~ ~ 2.2µF PERIPHERAL ~ ~ ~ DISCONNECT HOST TERM POWER 5V LX5203 ACK RST MSG REGOUT 2.2µF Note: Add third LX5203 for 16-bit SCSI PRODUCTION DATA - Information contained in this document is proprietary to Lin Finity, and is current as of publication date. This document may not be modified in any way without the express written consent of LinFinity. Product processing does not necessarily include testing of all parameters. Linfinity reserves the right to change the configuration and performance of the product and to discontinue product at any time. 4 Copyright © 1997 Rev. 1.9 7/97