Buffers provide full JTAG test access

Two new integrated circuits provide easy, cost-effective testability in basestations, switchers, multiplexers and other low-voltage telecommunications systems.

Two new integrated circuits provide easy, cost-effective testability in basestations, switchers, multiplexers and other low-voltage telecommunications systems.

National's new SCAN16602 and SCAN16512 are the latest products in a family of high performance chips that enable testability of boards or entire systems.

Buffers similar to the SCAN16602 and SCAN16512 are used in many new telecomms designs - they're effective for interfacing components to buses or to each other.

However, in the past designers may not have used SCAN/JTAG compliant buffers due to the cost - typically three to 10 times the cost of a non-JTAG buffer.

With the introduction of the SCAN16602 and the SCAN16512 devices, designers can now choose to use JTAG compliant buffers without paying a price penalty.

"The SCAN16602 and SCAN16512 extend National's lead in high-performance I/O and JTAG-enabled integrated circuits", said Mark Holdaway, Marketing Manager for National's Enhanced Solutions Product Group in Europe.

"With these new chips, our customers can create systems with built-in test features that dramatically lower the total cost of ownership".

The SCAN16602 and SCAN16512 are high-speed, low-power universal 16bit transceivers with industry-standard IEEE1149.1 test access.

The data inputs are organised into two 8bit bytes with separate output enable and direction control signals.

These functions can be configured as a D-type latch or flip-flop, and can operate in transparent, latched or clocked mode.

These devices can replace the functionality in many other transceiver products, which saves costs and reduces the need to stock several different types of device.

The SCAN16602 and SCAN16512 are designed for inserting test points into high-speed TTL/CMOS backplanes and operate over a supply voltage range of 2.7 to 3.6V.

Optional bus hold or series resistors on the SCAN16602 and SCAN16512 eliminate the need for additional pull-up/down or external termination resistors while minimising system noise.

High-performance BGA packaging minimises the board space needed when using these functions.

The SCAN16602 is ideal for telecomms and datacomms equipment manufacturers of basestations, switches and multiplexers.

National's SCAN16602 and SCAN16512 are available in 64-bump BGA packaging at $3.25 each in 1000-unit quantities.

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