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Oki Semiconductor Extends its Product Family of Low Cost, Computer Telephony Bus Integration Devices; ML53612 is Ideal for Cost-Sensitive Medium-Density Applications.

SUNNYVALE, Calif.--(BUSINESS WIRE)--Sept. 20, 1999--

Oki Semiconductor, a leading manufacturer of advanced integrated circuit solutions for the communications market, today announced a new addition to its Computer Telephony (CT) Bus Integration Device family, the ML53612. The ML53612 is a complete CT bus system interface and time-slot exchange device that provides a cost-effective connection between communication interfaces and signal processing resources and the CT bus. Designed for medium-density telephone network interfaces, the ML53612 supports both H.100 and H.110 specifications of the ECTF (Enterprise Computer Telephony Forum).

"The ML53612 was developed based on the industry's need for medium-density products that need to be very cost-effective," said Fred Kamp, director network product marketing, Oki Semiconductor. "With this addition, Oki broadens its offering of the lowest cost, most flexible CT Bus integration solutions on the market, highlighting its ongoing commitment to delivering cutting-edge products to customers."

The ML53612 follows the introduction of Oki's acclaimed ML53812-2 CT bus solution in May 1999. Like the ML53812-2, the ML53612 includes unique embedded analog phase lock loop (PLL) circuitry. Combined with the on-chip digital PLL circuitry, it complies with the Maximum Time Interval Error (MTIE) Strata 3, 4 and 4.E recommendations for excellent jitter attenuation and reliable clock synchronization across multiple boards. This feature makes the device well suited for developers of medium-density telephone network interfaces where fail-safe clock synchronization is critical. The ML53612 supports medium-density applications such as digital and analog interface, speech recognition, and medium-density TDM Interface cards. Its programmable gain control feature on the local bus (adjustable from -31dB to +31dB) makes the ML53612 particularly well suited for analog interface applications.

Oki's CT bus product family is designed to take advantage of both the mandatory and optional features defined in the H.100 and H.110 interoperability specifications. The H.100/H.110 CT bus uses the identical switching model and the same clock speeds as the SC bus, providing developers with unparalleled flexibility in integrating multiple bus standards in one system. The ML53612 uses a standard 3.3-volt I/O (input/output) with 5-volt tolerant input, which enhances compatibility with older-generation devices. The ML53612 also supports the IEEE 1149.1 standard for boundary scan (JTAG).

The ML53612 is a non-blocking 128 x 4096 time-slot switch, interfacing up to 128 (64 transmit plus 64 receive) ports on the parent device to any of the 4096 time-slots on the CT bus. The number of local time-slots that are available make it easier to design low- to medium-density CT hardware, supporting as many as two network interfaces or 64 voice processing ports per chip.


The ML53612 offers a number of flexibility features, including local loop back and 8-channel stream-to-stream connectivity features that provide board designers with broad diagnostic capabilities. In addition, Oki is the only vendor to offer CT bus integration devices that include the H.100 Optional Message Channel Interface and watchdogs for both clock and microprocessor. The device also offers two sets of CT bus timing signals, two CT bus network reference signals and a choice of sixteen input clock reference frequencies. Finally, the slave PLL on the ML53612 can be configured to lock to any one of the six pairs of timing signals, making this the ideal product for any designer.


The ML53612 is offered in a standard ultra slim 176-pin low quad flat pack (LQFP) package, which is pin-to-pin compatible with Oki's ML53812-2 product, making it possible to mount the device on either side of the board and to help conserve board space. Full production of the ML53612 is expected to begin in Q4 99. Samples are available now, and Oki is current offering two free samples to qualified customers.

About Oki Semiconductor

Building on Oki's century-long commitment to communications technologies and markets, Oki Semiconductor designs and markets a broad line of advanced integrated circuits for telecommunications, network, automotive, computer, and consumer products. Oki's product lines include telecommunications, RF, laser, networking, speech synthesis, ASIC, microcontroller, and memory devices, offered in a variety of creative packages. Founded in 1977 and headquartered in Sunnyvale, Calif., Oki Semiconductor is a division of Oki America Inc., which is a subsidiary of Oki Electric Industry Co, Ltd. Oki has ISO-9000-certified manufacturing facilities in Japan and Thailand. Information on Oki Semiconductor and its products is available through its Web site at
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Publication:Business Wire
Date:Sep 20, 1999
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