74HC datasheet(17/19 Pages) PHILIPS

17 / 19 page

March 1988

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.

Voltages

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

typically 0 V.

ICC

Quiescent power supply current; the current

ﬂowing into the VCC supply terminal.

∆I

Additional quiescent supply current per input

pin at a speciﬁed input voltage and VCC.

IGND

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.

IIK

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.

IOK

Output diode current; the current ﬂowing into a

device at a speciﬁed output voltage.

IOZ

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.

GND

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.

VCC

Supply voltage; the most positive potential on

the device.

VEE

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.

VIH

HIGH level input voltage; the range of input

voltages that represents a logic HIGH level in

the system.

Analog terms

Capacitances

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.

RON

ON-resistance; the effective ON-state

resistance of an analog switch, at a speciﬁed

voltage across the switch and output load.

∆R

∆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.

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).

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.

Switch capacitance; the capacitance of a

terminal to a switch of an analog device.

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