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74HC

FAMILY SPECIFICATIONS HCMOS family characteristics

Philips Electronics 

Philips Semiconductors

HCMOS family characteristics

FAMILY SPECIFICATIONS

DEFINITIONS OF SYMBOLS AND TERMS USED IN

HCMOS DATA SHEETS

Currents

Positive current is defined as conventional current flow

into a device.

Negative current is defined as conventional current flow

out of a device.

ICC

∆ICC

IGND

II

IIK

IO

IOK

IOZ

IS

Quiescent power supply current; the current

flowing into the VCC supply terminal.

Additional quiescent supply current per input

pin at a specified input voltage and VCC.

Quiescent power supply current; the current

flowing into the GND terminal.

Input leakage current; the current flowing into a

device at a specified input voltage and VCC.

Input diode current; the current flowing into a

device at a specified input voltage.

Output source or sink current: the current

flowing into a device at a specified output

voltage.

Output diode current; the current flowing into a

device at a specified output voltage.

OFF-state output current; the leakage current

flowing into the output of a 3-state device in the

OFF-state, when the output is connected to

VCC or GND.

Analog switch leakage current; the current

flowing into an analog switch at a specified

voltage across the switch and VCC.

Voltages

All voltages are referenced to GND (ground), which is

typically 0 V.

GND

VCC

VEE

VH

VIH

Supply voltage; for a device with a single

negative power supply, the most negative

power supply, used as the reference level for

other voltages; typically ground.

Supply voltage; the most positive potential on

the device.

Supply voltage; one of two (GND and VEE)

negative power supplies.

Hysteresis voltage; difference between the

trigger levels, when applying a positive and a

negative-going input signal.

HIGH level input voltage; the range of input

voltages that represents a logic HIGH level in

the system.

VIL

LOW level input voltage; the range of input

voltages that represents a logic LOW level in

the system.

VOH HIGH level output voltage; the range of

voltages at an output terminal with a specified

output loading and supply voltage. Device

inputs are conditioned to establish a HIGH level

at the output.

VOL LOW level output voltage; the range of voltages

at an output terminal with a specified output

loading and supply voltage. Device inputs are

conditioned to establish a LOW level at the

output.

VT+ Trigger threshold voltage; positive-going signal.

VT− Trigger threshold voltage; negative-going

signal.

Analog terms

RON

∆RON

ON-resistance; the effective ON-state

resistance of an analog switch, at a specified

voltage across the switch and output load.

∆ON-resistance; the difference in

ON-resistance between any two switches of an

analog device at a specified voltage across the

switch and output load.

Capacitances

CI

Input capacitance; the capacitance measured

at a terminal connected to an input of a device.

CI/O Input/Output capacitance; the capacitance

measured at a terminal connected to an I/O-pin

(e.g. a transceiver).

CL

Output load capacitance; the capacitance

connected to an output terminal including jig

and probe capacitance.

CPD Power dissipation capacitance; the capacitance

used to determine the dynamic power

dissipation per logic function, when no extra

load is provided to the device.

CS

Switch capacitance; the capacitance of a

terminal to a switch of an analog device.

March 1988

17

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