Lansdale Semi Extends Life Of Five Popular Freescale Wireless ICs
Phoenix -- Lansdale Semiconductor, Inc. president, R. Dale Lillard, announced the availability of the encoder/decoder pairs and digital to analog converters (DACs) originally designed and built by Freescale Semiconductor, Inc. These general purpose building block integrated circuits (IC's) include the MC145026, MC145027, and MC145028 encoder/decoder pairs along with MC144110 and MC14111 digital to analog converters.
Lansdale now has single-source rights to both globally market and continue to manufacture Freescale's MC145026, MC145027, MC145028, MC144110 and MC144111. Built using complementary metal–oxide–semiconductor (CMOS) these devices are incorporated into Lansdale's exclusive product life cycle management system. This unique quality control system guarantees form, fit, and function meets the original manufacturer's design specifications. This assures a continuous source of high performance IC's to the worldwide electronics market.
The MC145026, MC145027, and MC145028 encoder/decoder are designed to be used as a pair in remote control applications. This insures that the correct signal gets to the right device. This unique function is essential when used in applications such as garage door openers, remote sensors and/or controls, and light fixtures. Other possible applications include optometric equipment and air conditioning remote control.
The MC145026 encodes nine lines of information and serially sends this information upon receipt of a transmit enable (TE) signal. The nine lines may be encoded with trinary data (low, high, or open) for a total of 19,683 possible codes or binary data (low or high). When used together the MC145026 and MC145027 can encode 4 bits of data which allows you to dial in a code and use that code to remotely address a specific device. For added security the chips transmit words twice during the encoding sequence.
The MC145027 decoder receives the serial stream and interprets five of the trinary digits as an address code. Thus, 243 addresses are possible. If binary data is used at the encoder, 32 addresses are possible. The remaining serial information is interpreted as four bits of binary data. The valid transmission (VT) output goes high on the MC145027 when two conditions are met. First, two addresses must be consecutively received (in one encoding sequence) which both match the local address. Second, the 4 bits of data must match the last valid data received. The active VT indicates that the information at the Data output pins has been updated.
The MC145028 decoder treats all nine trinary digits as an address which allows 19,683 codes. If binary data is encoded, 512 codes are possible. The VT output goes high on the MC145028 when two addresses are consecutively received (in one encoding sequence) which both match the local address. The MC144110 and MC144111 are low–cost 6–bit digital to analog converters with serial interface ports to provide communication with CMOS microprocessors and microcomputers. The MC144110 contains six static D/A converters; the MC144111 contains four converters.
Application notes available at www.lansdale.com
Due to a unique feature of these DACs, the user is permitted easy scaling of the analog outputs of a system. Over a 5 to 15 V supply range, these DACs may be directly interfaced to CMOS Micro Processing Unit (MPU's) operating at 5 V. Other key features include data output pin for cascading along with R-2R and emitter follower outputs. DACs controlled by successive 6-bit words of serial data input.
DACs are ubiquitous in applications involving digital signal processing of real-world signals such as those found in communication systems, instrumentation, and audio/ video processing systems. Other applications include telecommunication base station and industrial control. These particular devices have also been used in aerospace communication, short range radio communication, and printers.
Two important characteristics of CMOS devices are high noise immunity and low static power consumption. Significant power is only drawn while the transistors in the CMOS device are switching between on and off states. Consequently, CMOS devices do not produce as much waste heat as other forms of logic, for example transistor-transistor logic (TTL) or NMOS logic, which uses all n-channel devices without p-channel devices. CMOS also allows a high density of logic functions on a chip. It was primarily this reason why CMOS won the race in the eighties and became the most used technology to be implemented in very-large-scale integration (VLSI) chips.
The Lansdale model has become more important as the growth of the counterfeit industry has increased the problem of maintaining a reliable source of components for long-life systems. "With counterfeit electronic components becoming more of a global industry nightmare, Lansdale's 30 plus years of product life cycle management, support and manufacturing using only the OEM's original tooling has become even more critical in today's market" stated Lillard.
All Lansdale products are manufacturing to support existing as well as new designs. Our exclusive life cycle management program assures you of a dependable, continuous, cost effective, and high quality source of classic designed IC's today...and tomorrow.
SOURCE: Lansdale Semiconductor, Inc.