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CPLDs tout small form factor

Posted: 16 Dec 2008     Print Version  Bookmark and Share

Keywords:small-footprint  CPLDs  space-saving packages 

Lattice Semiconductor Corp. has unveiled two new, small-footprint packages for their ispMACH 4000ZE CPLDs. The devices suit high volume, handheld designs that demand extremely low power.

The ispMACH 4000ZE is a new generation, ultra low-power CPLD family based on Lattice's existing ispMACH 4000 CPLD architecture. The ispMACH 4064ZE device is available now in a 64-ball ultra chip scale BGA (ucBGA) package with a 4mm x 4mm footprint; the ispMACH 4128ZE device is available in a 132-ball ucBGA package with a 6mm x 6mm footprint, enabling both devices to accommodate the very tight space constraints common with portable and handheld equipment. In fact, the new space-saving packages enable designers to use these ispMACH 4000ZE devices in a board space that is 36 per cent smaller than previously possible.

The ispMACH 4000ZE family is ideal for low-power, high-volume portable applications, with typical standby current as low as 10µA. The devices operate from a nominal 1.8V power supply with operation extended down to 1.6V, accommodating extended end-of-battery-life voltages that can provide useful added margin for many systems. The family offers system features such as Power Guard dynamic power reduction; per pin pull-up, pull-down or bus keeper control; an on-chip user oscillator and timer; and input hysteresis. The Power Guard feature lowers power consumption by selectively disabling unused input pins so their switching does not consume dynamic power needlessly.

The ispMACH 4000ZE devices' 5V tolerant I/Os are claimed to be unique among the current generation of CPLD families. These I/Os may be used for connecting to TTL and PCI interfaces with no external components, which make them ideal for connecting to legacy chips and interfaces.

The ispMACH 4000ZE devices have two I/O banks, each with its own power supply voltage that can be set at the appropriate level to support LVTTL and LVCMOS 3.3-, 2.5-, 1.8- and 1.5V outputs. The device input buffers have programmable thresholds that support the above standards independent of the I/O bank voltage. Extended range 3.3V I/O current is supported, instead of the more common narrow range version.

The ispMACH 4000ZE family also offers "always on" input hysteresis for each pin. This feature provides improved noise immunity for 3.3V and 2.5V inputs. An internal oscillator also is provided for use in miscellaneous housekeeping functions such as watchdog "heartbeat" functions, digital de-glitch circuits and control state machines.

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