Logic selection guide 2016

Where logic really stands out
Logic is great for making minor modifications and fine-tuning performance
in the later design stages, but that’s not all it can do. Today’s logic devices
let you add features and improve functionality, so you can meet your design
requirements right from the start, even before you need to think about lastminute
revisions.
ASIC-driven systems
In systems that use application-specific integrated
circuits (ASICs), logic gates can be used to provide
control or “glue” functions. Modern logic families
include features, such as overvoltage tolerance,
that enable them to be used as glue logic between
ASICs that use different supply voltages. In some
cases, this can extend the lifetime of legacy ASICs.
Available in small-footprint packages, such as
PicoGate, MicroPak, and Diamond, today’s glue
logic is suitable for space-constrained applications.
MCU-driven systems
In systems that use a microcontroller (MCU), logic
products are used for low-cost I/O expansion.
Shift registers are used for digital I/O expansion,
and analog switches are used to multiplex analog
sensor inputs. The combination of the two enables
the selection of lower-pincount MCUs with fewer
analog-to-digital converters. When used this way,
standard logic enables true cost optimization of an
application. Dual supply-voltage translators make it
possible to use MCU-based systems across multiple
supply-voltage domains.
Computing
In tablets and laptops, logic can be used for battery
charging and discharging blocks, and to provide
standby mode, power-down, and start-up control
sequences. In docking stations and systems that
support multiple displays, logic provides the bus
switches, resets, and audio blocks that reduce the
impact of noisy signals, and can be used to buffer
the clock and data signals.
Mobile
In mobile devices such as smartphones, tablets, and
cameras, logic provides multiplexing, buffering,
and level-translation functions for the baseband, RF
interfaces, memory, and other peripherals.
Audio
Logic buffers are used in external speakers and
other high-end audio equipment to buffer the
clock, sync, and data signals sent to the audio
interface and docking station.
6 NXP Logic selection guide 2016