DS2114. SCSI Terminator FEATURES PIN ASSIGNMENT
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1 DS2114 Terminator FEATURES Fully compliant with, 2 and 3 standards Provides active termination for nine signal lines Laser trimmed termination resistors have 2% tolerance Low dropout voltage regulator Fully supports actively negated signals Onboard thermal shutdown circuitry PIN ASSIGNMENT TERMPWR1 R1 R2 R3 R4 R NC R9 R8 R7 R6 NC DS2114Z 16 PIN SOIC (150 MIL) Narrow 16 pin plastic SOIC (DS2114Z) DESCRIPTION The 2 and 3 standards recommend the use of active terminations at both ends of every cable segment in a system with single ended drivers and receivers. The DS2114 Terminator, which is fully compliant with these standards, enables the designer to gain the benefits of active termination: greater immunity to voltage drops on the TERMPWR (TER- Mination PoWeR) line, enhanced high level noise immunity, intrinsic TERMPWR decoupling, and very low quiescent current consumption. The DS2114 integrates a regulator and nine precise termination resistors into a monolithic IC. The DS2114 is intended for cable end terminator assemblies and devices where the terminators do not need to be isolated from the bus /6
2 FUNCTIONAL DESCRIPTION The DS2114 consists of a bandgap reference, buffer amplifier, and nine termination resistors (Figure 1). The bandgap reference circuit produces a precise 2.55 volts level which is fed to a buffer amplifier. The buffer produces a 2.85 volts level and is capable of sourcing at least 24 ma into each of the termination resistors when the signal line is low (active). When the driver for a given signal line turns off, the terminator will pull the signal line to 2.85 volts (quiescent state). To handle actively negated signals, the buffer can sink at least 200 ma and V ref will move less than 60 mv. When all lines settle in the quiescent state, the regulator will consume about 2.5 ma. To ensure proper operation, both the TERMPWR1 and pins must be connected to the bus TERMPWR line and both the and pins must be tied together externally. Each DS2114 requires a 4.7 µf capacitor connected between the VREF pins and ground. Figure 2 details a typical bus configuration. In an 8 bit wide bus arrangement ( A Cable), two DS2114 s would be needed at each end of the cable in order to terminate the 18 active signal lines. In a 16 bit wide bus arrangement ( P Cable), three DS2114 s would be needed at each end of the cable in order to terminate the 27 active signal lines. DS2114 BLOCK DIAGRAM Figure 1 TERMPWR1 BANDGAP REFERENCE R1 R2 + R3 R4 R5 R6 R7 R8 R /6
3 TYPICAL CONFIGURATION Figure 2 Termination Power Line C1 + TERMPWR1 C1 + R1 DS2114 R8 R9 + C2 CABLE R1 R2 DS2114 TERMPWR1 R9 NOTES: 1. C1 = 4.7 µf tantalum C2 = 2.2 µf tantalum or 4.7 µf aluminum 2. If the DS2114 is to be embedded into a peripheral that will act as a target on a bus, it is recommended that TERMPWR be derived from the cable, not generated locally. In this configuration, if a power failure occurs in the peripheral, it will not affect the bus. 3. A high frequency bypass capacitor (0.1 µf recommended) can be added in parallel to C1 for applications using fast rise/fall time drivers /6
4 PIN DESCRIPTION Table 1 DS2114Z PIN SYMBOL DESCRIPTION 1 TERMPWR1 Termination Power 1. Should be connected to the TERMPWR line. Must be decoupled with either a 2.2 µf or 4.7 µf. See Figure 2. 2 R1 Signal Termination 1. termination. 3 R2 Signal Termination 2. termination. 4 R3 Signal Termination 3. termination. 5 R4 Signal Termination 4. termination. 6 R5 Signal Termination 5. termination. 7 Reference Voltage 1. Must be externally connected directly to the pin. Must be decoupled with a 4.7 µf capacitor as shown in Figure 2. 8 Ground. Signal ground; 0.0 volts. 9 Termination Power 2. Should be connected to the TERMPWR line. Must be decoupled with either a 2.2 µf or 4.7 µf. See Figure R6 Signal Termination 6. termination. 12 R7 Signal Termination 7. termination. 13 R8 Signal Termination 8. termination. 14 R9 Signal Termination 9. termination. 10, 16 NC No Connect. Do not connect any signal to these pins. 15 Reference Voltage 2. Must be externally connected directly to the pin. Must be decoupled with a 4.7 µf capacitor as shown in Figure /6
5 ABSOLUTE MAXIMUM RATINGS* Voltage on Any Pin Relative to Ground 1.0V to +7.0V Operating Temperature 0 C to 70 C Storage Temperature 55 C to +125 C Soldering Temperature 260 C for 10 seconds * This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. The Dallas Semiconductor DS2114 is built to the highest quality standards and manufactured for long term reliability. All Dallas Semiconductor devices are made using the same quality materials and manufacturing methods. However, the DS2114 is not exposed to environmental stresses, such as burn in, that some industrial applications require. For specific reliability information on this product, please contact the factory in Dallas at (972) RECOENDED OPERATING CONDITIONS (0 C to 70 C) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES TERMPWR Voltage V TP V DC CHARACTERISTICS (0 C to 70 C) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES TERMPWR Current I TP I TP 5 Termination Resistance R TERM ohms 1, 2 Die Thermal Shutdown T SD 150 C 1, 5 Termination Capacitance C T 5.0 pf 1, 2, ma ma 1, 3 1, 4 REGULATOR CHARACTERISTICS (0 C to 70 C) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Output Voltage V REF V 1, 2 Drop Out Voltage V DROP V 3, 5 Line Regulation LI REG % 1, 4 Output Current I OUT 24.0 ma 6 Load Regulation LO REG % 1, 3 Current Limit I LIM ma 1 Sink Current I SINK 200 ma 1 NOTES: volts < TERMPWR < 5.50 volts volts < signal lines < TERMPWR. 3. All signal lines = 0.0 volts. 4. All signal lines open. 5. Guaranteed by design; not production tested. 6. V SIGNAL = 0.2V /6
6 DS2114Z TERMINATOR 16 PIN SOIC (150 MIL) ÎÎ PKG 16 PIN DIM MIN MAX A IN. A1 IN. A2 IN. b IN. C IN D IN e IN BSC 1.27 BSC E1 IN. H IN. L IN Θ /6
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RT2517B. 1A, 6V, Ultra-Low Dropout Linear Regulator. Features. General Description. Applications. Ordering Information. Marking Information
Sample & Buy 1A, 6V, Ultra-Low Dropout Linear Regulator General Description The is a high performance positive voltage regulator designed for use in applications requiring ultralow input voltage and ultra-low
LOW SKEW 1 TO 4 CLOCK BUFFER. Features
DATASHEET ICS651 Description The ICS651 is a low skew, single input to four output, clock buffer. Part of IDT s ClockBlocks TM family, this is a low skew, small clock buffer. IDT makes many non-pll and
High Speed, +5 V, 0.1 µf CMOS RS-232 Drivers/Receivers ADM222/ADM232A/ADM242*
a FEATURES 00 kb/s Transmission Rate Small (0. µf) Charge Pump Capacitors Single V Power Supply Meets All EIA--E and V. Specifications Two Drivers and Two Receivers On-Board DC-DC Converters ± V Output
3-W High-Voltage Switchmode Regulator
3-W High-Voltage Switchmode Regulator DESCRIPTION The high-voltage switchmode regulator is a monolithic BiC/DMOS integrated circuit which contains most of the components necessary to implement a high-efficiency
TPS7415, TPS7418, TPS7425, TPS7430, TPS7433 FAST-TRANSIENT-RESPONSE USING SMALL OUTPUT CAPACITOR 200-mA LOW-DROPOUT VOLTAGE REGULATORS
Fast Transient Response Using Small Output Capacitor ( µf) 2-mA Low-Dropout Voltage Regulator Available in.5-v,.8-v, 2.5-V, 3-V and 3.3-V Dropout Voltage Down to 7 mv at 2 ma () 3% Tolerance Over Specified
Synchronous Buck Converter Controller
Product is End of Life 3/204 Synchronous Buck Converter Controller Si950 DESCRIPTION The Si950 synchronous buck regulator controller is ideally suited for high-efficiency step down converters in battery-powered
4.5V to 32V Input High Current LED Driver IC For Buck or Buck-Boost Topology CN5816. Features: SHDN COMP OVP CSP CSN
4.5V to 32V Input High Current LED Driver IC For Buck or Buck-Boost Topology CN5816 General Description: The CN5816 is a current mode fixed-frequency PWM controller for high current LED applications. The
MK1413 MPEG AUDIO CLOCK SOURCE. Features. Description. Block Diagram DATASHEET
DATASHEET MK1413 Description The MK1413 is the ideal way to generate clocks for MPEG audio devices in computers. The device uses IDT s proprietary mixture of analog and digital Phase-Locked Loop (PLL)
CMD170P GHz Driver Amplifier. Features. Functional Block Diagram. Description
Features Functional Block Diagram High output power On-chip detector All positive bias Pb-free RoHs compliant 4x4 QFN package Description The CMD170P4 is a GaAs MMIC driver amplifier housed in a leadless
LM2991 Negative Low Dropout Adjustable Regulator
LM2991 Negative Low Dropout Adjustable Regulator General Description The LM2991 is a low dropout adjustable negative regulator with a output voltage range between 3V to 24V. The LM2991 provides up to 1A
Dual Input Dropout Regulators
Dual Input Dropout Regulators Product Description The GS8 is a high performance positive voltage regulator is designed for use in applications requiring very low dropout voltage at amps. When supplying.
+10V Precision VOLTAGE REFERENCE
+1V Precision VOLTAGE REFEREE FEATURES OUTPUT VOLTAGE: +1V ±.% max EXCELLENT TEMPERATURE STABILITY: 8.ppm/ C max ( C to +8 C) LOW NOISE: µvp-p typ (.1Hz to 1Hz) EXCELLENT LINE REGULATION:.1%/V max EXCELLENT
PI3C V/3.3V, High Bandwidth, Hot Insertion 8-Bit, 2-Port, Bus Switch. Description. Features. Pin Configuration. Block Diagram.
Features Near-Zero propagation delay 5-ohm switches connect inputs to outputs High Bandwidth Operation (>400 MHz) Permits Hot Insertion 5V I/O Tolerant Rail-to-Rail 3.3V or 2.5V Switching 2.5V Supply Voltage