DALLAS (February 20, 1995) -- Developers of personal computers, workstations, portable systems, hard disk drives and telecommunications systems will be able to increase system performance with new Widebus™ switching logic based on cross bar technology (CBT) from Texas Instruments. The additions to TI's existing CBT logic family includes the industry's widest bit width and the first device with synchronous control capabilities.
CBT logic is based on simple N-channel transistor switches which, because of a very low on-chip resistance of only four ohms, have a propagation delay of just 250 picoseconds, or 16 times faster than CMOS or BiCMOS logic. CBT logic can be used in a number of ways, including extremely fast bus connections, bus exchanges, 5-to-3-volt signal translation, memory interleaving and bus byte-swapping.
TI's five new CBT devices range in bit-width from 12 to 24 and include a variety of functionality such as simple bus switching, bus multiplexing and bit multiplexing. When used with an external diode, CBT logic can shift voltage levels from 5 to 3 volts, allowing the system designer, for example, to use the most advanced 3-volt microprocessors with less expensive 5-volt memory components. Three of the devices provide bit or bus multiplexing to facilitate functions such as memory interleaving. One such multiplexing device is the industry's only CBT logic device with synchronized select lines which enhance the performance of the device.
"In applications where speed is very important, our CBT logic can perform signal level translation with virtually no impact on system performance," said Hal Speed, TI strategic marketing manager. "And our Widebus devices, with bit-widths up to 24-bits, can reduce component count for today's wider data bus requirements."
For portable systems, such as notebook and laptop computers, the effective life of batteries can be extended by CBT logic's very low power consumption. Its maximum ICC of just 3 micro-amps is hundreds of times less than comparable bus interface logic devices. And two small packaging options, the Widebus shrink small outline package (SSOP) and Shrink Widebus™ thin shrink small outline package (TSSOP), are available for space-constrained applications.
The functionality and part numbers of the five new CBT Widebus logic devices are listed below:
18-bit bus exchange switch SN74CBT16209
24-bit bus exchange switch SN74CBT16212
12-bit 3-to-1 mux/crossbar switch SN74CBT16214
16-to-32-bit muxed switch with synchronous control SN74CBT16232
16-to-32-bit muxed switch SN74CBT16233
The SN74CBT16209, SN74CBT16212 and SN74CBT16214 devices are available now from Texas Instruments and its authorized distributors. Suggested resale pricing in quantities of 1,000 begins at $2.25. The SN74CBT16232 and SN74CBT16233 devices are sampling now and volume production is scheduled for May.
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Please refer to profile number: SCD02
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Widebus and Shrink Widebus are trademarks of Texas Instruments Incorporated.
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