Dallas - Texas Instruments Inc. says it has designed its CB3T, CB3Q and CBT-C bus switch chip families to meet the needs of system designers who face the challenge of supporting mixed-mode signal operation and need bus interface devices that provide voltage translation. Also, TI says the FET switches provide low-power replacements for standard bus interface devices when signal buffering (current drive) is not required.
The CB3T voltage translator bus switch family operates at 3.3 volts or 2.5 V Vcc and supports systems using 5 V TTL, 3.3-V LVTTL and 2.5-V CMOS switching standards. The devices fully support mixed-mode signal operation on all ports. The SN74CB3T3306 dual FET bus switch features independent line switches. Budgetary pricing for the CB3T3306 in the US-8 (DCU) package is $1.10 in quantities of 1,000.
Another challenge is to increase the performance of multichannel applications that require transmission of huge amounts of data. The CB3Q family provides a high-performance interface solution ideal for communications and networking infrastructure equipment, as well as other data-intensive computing applications.
The CB3Q family operates at 3.3 V or 2.5 V Vcc, supporting systems using the same switching standards. CB3Q devices provide very-low and flat on-state resistance, 0- to 5-V rail-to-rail switching (no voltage clamping), and very-low input/output capacitance to minimize capacitive loading and signal distortion.
The SN74CB3Q3306A is a dual FET bus switch featuring independent line switches. Budgetary pricing for the CB3Q3306 in the TSSOP package is $1.65 in quantities of 1,000.
The CBT-C is a general-purpose bus switch family operating at 5 V Vcc. The SN74CBT16214C provides 12 bits of high-speed TTL-compatible bus switching and a low on-state resistance, allowing connections to be made with minimal propagation delay. Active undershoot-protection circuitry on the A and B ports provides protection for undershoot down to -2 V. Budgetary pricing for the CBT16214C in the TSSOP package is $1.10 in quantities of 1,000.
Functions in all three bus switch technology families are available now from TI and its authorized distributors. Remaining functions will continue to be released throughout 2003.
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