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75 k

Low power audio amp

Motorola has introduced a new low power audio amplifier IC specially suited for telephone applications. The MC34119 provides differential speaker outputs, to maximize output swing at low supply voltages (2 volts minimum) and to obviate the need for a coupling capacitor.

Open loop gain is typically 80dB, per-mitting the extemally controlled closed loop gain to be set to high values with good accuracy. A Chip Disable pin per-mits powering down the amplifier and muting the output signal.

The MC34119 audio amplifier is avail-able in a standard 8-pin DIP or surface mount package and offers several ad-vantages over other audio amplifiers on

Plastic/quad fiat pack

National Semiconductor has an-nounced an IC package that accommo-dates devices with up to 244 leads in a very smali area.

Known as Plastic Ouad Fiat Pack (PQFP), the new design has been ap-proved by the United States’ Electronic Industry Association/Joint Electron De-vice Engineering Council (EIA/ JEDEC), as an industry-standard package.

POFP packages are Fine-pitched plastic fiat packs with gull-wing leads bent outwards from the package body. The leads are on a 25-mil(0.025”) centre-to-centre pitch.

the market. The operating quiescent current is 2.7mA typical, 4mA maxi-mum. The power down quiescent current is 65uA and the minimum supply voltage is 2V. The MC34119 is unity gain stable, permits a wide rangę of speaker loads (8-100 ohms) and offers low total harmonie distortion (0.5% typical).

AIthough the MC34119 was primarily intended for hands-free telephones (speakerphones), it should also find use in other applications requiring a low power audio amplifier — such as bat-tery operated equipment, portable radios, tape recorders dictating ma-chines and intercoms.

Further information is available from Motorola Sales Offices and distributors.

Moulded “bumpers” on each corner of the packages protect the leads, allow-ing the packages to be shipped in tubes or in a tape-and-reel format designed for automated-assembly equipment.

The design is a cross between the plastic fiat packs popular in Japan and the tiny globe “bumpered” package originally developed by AT&T.

The POFP is easily adaptable to high-speed, automated components place-ment techniques.

The new family has versions with 52, 84, 100, 132, 164, 1% and 244 leads.

National is tooled up for the 132-lead version and has produccd working sam-ples containing its SCX6225 CMOS gate array.

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8K x 8 RAM

Goldstar Semiconductor has released the GM76C88, a 65,536 bit static random access memory organised as 8,192 words by 8 bits. The devices uses CMOS technology and operates from a single 5 volt supply. Advanced Circuit techniques provide both high speed and low power features, with a maximum operating current of 80mA and minimum cycle time of 60ns/70ns/80ns.

The combination of speed optimised circuitry results in a very high speed memory device. Thus the GM76C88 is suitable • for use in various micropro-cessor application Systems where high speeds are required. It is offered in a 28-pin DIP package.

For further details contact Penn Central Group, 56 Silverwater Road, Au-bum, NSW 2144.

CHMOS 128K EPROM

Intel has introduced a CHMOS 128-kilobit EPROM (erasable, programma-ble, read-only memory) designed to meet the low power and high performance requirements of CHMOS micro-processor and microcontroller-based Systems.

IntePs 27028, organized 16K by 8, is pin-compatible with earlier HMOS 128-kilobit EPROMs, such as IntePs standard 27128A and 110-nanosecond 27128B. The new 27VC128 is manufac-tured with IntePs CHMOS II-E (com-plementary, high performance metal oxide semiconductor) process technology and provides a maximum access time as fast as 150 nanoseconds. It con-sunies 100 microamps during standby, 30 milliamps when active.

In addition, Intel is offering the 27028 in three different packaging op-tions to meet a variety of application needs. Customers can choose a standard 28-Din ceramic DIP (dual-in-Iine package) a 28-pin plastic, OTP (one-time programmable) DIP; or a 32-lead PLCC (plastic leaded chip carrier) for surface-mount capability.

The 27028 is available in speeds ranging from 150 nanoseconds to 250 nanoseconds, as well as in standard and extended temperaturę ranges.

In addition, IntePs Ouick-Pulse Pro-

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ELECTRONICS Australia, September 1987