Semiconwell manufactures passive network components, integrated active and passive devices, resistor networks, capacitor networks, schottky and zener diode networks, and npn, pnp transistors arrays that perform the following functions: series and parallel linear and nonlinear GTL, AC, Diode, Thevenin termination networks, precision thin film resistor capacitor networks (RC networks), isolated, bussed resistor networks including zero ohms jumper arrays, voltage divider networks, resistor networks for audio applications, EMI, RFI and ESD zener clamped diodes and transient voltage suppressors networks, EMI/RFI filter networks and clock terminations. Semiconwell's proprietary semiconductor technology, advanced thin films processes, in house assembly and packaging technologies allow manufacturing of flip chip CSP chip scale and MLF molded lead frame surface mount integrated passive networks that include unprecedented large capacitors >1microfarad (1µF) and giga ohms resistors (GW).

 

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SEMICONWELL
Integrated Passive Networks
SW DUAL THEVENIN TERMINATION NETWORKS
SWRDT-XX-8 6 CHANNELS 8 PIN PACKAGE DUAL THEVENIN TERMINATION NETWORK
SWRDT-XX-14 12 CHANNELS 14 PIN PACKAGE DUAL THEVENIN TERMINATION NETWORK
SWRDT-XX-16 14 CHANNELS 16 PIN PACKAGE DUAL THEVENIN TERMINATION NETWORK
SWRDT-XX-20 18 CHANNELS 20 PIN PACKAGE DUAL THEVENIN TERMINATION NETWORK
SWRDT-XX-24 22 CHANNELS 24 PIN PACKAGE DUAL THEVENIN TERMINATION NETWORK
SWRDT-XX-24A 16 CHANNELS HIGH SPEED TRANSCEIVER LOGIC DUAL THEVENIN TERMINATION NETWORK
SWRDT-XX-24B 20 CHANNELS HIGH SPEED TRANSCEIVER LOGIC DUAL THEVENIN TERMINATION NETWORK
SWRDT-XX-28 26 CHANNELS 28 PIN PACKAGE DUAL THEVENIN TERMINATION NETWORK
 
 

The SCSI standard recommends proper resistor (Thevenin) termination at host and peripheral locations to eliminate transmission line effects. Dual Thevenin Termination Networks offer high integration and performance in a miniature QSOP or SOIC package, which saves critical board area and provides manufacturing cost and reliability efficiencies. A terminating resistror is used to reduce or eliminate unwanted reflections on a transmission line. It can perfom this function only when its resistance value matches the characteristic impedance of the transmission line. The resistors used for terminating the transmission lines should be noiseless, stable and functional at high frequencies.
High speed logic such as HSTL (High Speed Trans-ceiver Logic) require suitable signal termination. The SWRDT Dual Thevenin termination network provides 16 terminating channels per package, and optimizes signal integrity by reducing reflections and ringing. The terminations are available in a range of standard values and are ideal for use in HSTL busses. As seen in the device schematic, R1 is typically tied to V+ and serves as a pull-up resistor, while R2 functions as a pull-down resistor and is tied to ground (or the most negative supply voltage). In addition, the equivalent Thevenin resistance (R1 in parallel with R2) should match the impedance of the trace.Ground-bounce and crosstalk are virtually eliminated using four direct ground connections to the die substrate, as well as four double-bonded connections to V+, for a total of 8 commons. In addition, the resistors have an absolute tolerance of 1% which provides tight impedance-matching and results in greatly reduced reflections. This design provides optimal signal integrity..

   

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