Specifications

CY8C21123/CY8C21223/CY8C21323
Document Number: 38-12022 Rev. *Y Page 37 of 46
Document Conventions
Units of Measure
Table 40 lists the units of measures.
Numeric Conventions
Hexadecimal numbers are represented with all letters in uppercase with an appended lowercase ‘h’ (for example, ‘14h’ or ‘3Ah’).
Hexadecimal numbers may also be represented by a ‘0x’ prefix, the C coding convention. Binary numbers have an appended
lowercase ‘b’ (for example, 01010100b’ or ‘01000011b’). Numbers not indicated by an ‘h’ or ‘b’ are decimals.
Table 40. Units of Measure
Symbol Unit of Measure Symbol Unit of Measure
dB decibels mH millihenry
°C degree Celsius µH microhenry
µF microfarad µs microsecond
pF picofarad ms millisecond
kHz kilohertz ns nanosecond
MHz megahertz ps picosecond
rt-Hz root hertz µV microvolt
k

kilohm mV millivolt

ohm mVpp millivolts peak-to-peak
µA microampere V volt
mA milliampere W watt
nA nanoampere mm millimeter
pA pikoampere % percent
Glossary
active high 1. A logic signal having its asserted state as the logic 1 state.
2. A logic signal having the logic 1 state as the higher voltage of the two states.
analog blocks The basic programmable opamp circuits. These are SC (switched capacitor) and CT (continuous
time) blocks. These blocks can be interconnected to provide ADCs, DACs, multi-pole filters, gain
stages, and much more.
analog-to-digital
(ADC)
A device that changes an analog signal to a digital signal of corresponding magnitude. Typically,
an ADC converts a voltage to a digital number. The digital-to-analog (DAC) converter performs
the reverse operation.
Application
programming
interface (API)
A series of software routines that comprise an interface between a computer application and
lower level services and functions (for example, user modules and libraries). APIs serve as
building blocks for programmers that create software applications.
asynchronous A signal whose data is acknowledged or acted upon immediately, irrespective of any clock signal.
bandgap
reference
A stable voltage reference design that matches the positive temperature coefficient of VT with
the negative temperature coefficient of VBE, to produce a zero temperature coefficient (ideally)
reference.
bandwidth 1. The frequency range of a message or information processing system measured in hertz.
2. The width of the spectral region over which an amplifier (or absorber) has substantial gain (or
loss); it is sometimes represented more specifically as, for example, full width at half maximum.