Datasheet

GLOSSARY
SYMBOLS, TERMS, AND DEFINITIONS
1–5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
INTRODUCTION
These symbols, terms, and definitions are in accordance with those currently agreed upon by the JEDEC Council
of the Electronic Industries Association (EIA) for use in the USA and by the International Electrotechnical Commission
(IEC) for international use.
operating conditions and characteristics (in sequence by letter symbols)
C
i
Input capacitance
The capacitance of an input terminal of the device
C
io
Input/output capacitance
The capacitance of an input/output (I/O) terminal of the device with the input conditions applied that,
according to the product specification, establishes the high-impedance state at the output
C
o
Output capacitance
The capacitance of an output terminal of the device with the input conditions applied that, according
to the product specification, establishes the high-impedance state at the output
C
pd
Power dissipation capacitance
Used to determine the no-load dynamic power dissipation per logic function (see individual circuit
pages): P
D
= C
pd
V
CC
2
f + I
CC
V
CC
f
max
Maximum clock frequency
The highest rate at which the clock input of a bistable circuit can be driven through its required sequence
while maintaining stable transitions of logic level at the output with input conditions established that
should cause changes of output logic level in accordance with the specification
I
BHH
Bus-hold high sustaining current
The bus-hold circuit can source at least the minimum high sustaining current at V
IH
min. I
BHH
should
be measured after raising V
IN
to V
CC
and then lowering it to V
IH
min.
I
BHL
Bus-hold low sustaining current
The bus-hold circuit can sink at least the minimum low sustaining current at V
IL
max. I
BHL
should be
measured after lowering V
IN
to GND and then raising it to V
IL
max.
I
BHHO
Bus-hold high overdrive current
An external driver must sink at least I
BHHO
to switch this node from high to low.
I
BHLO
Bus-hold low overdrive current
An external driver must source at least I
BHLO
to switch this node from low to high.
I
CC
Supply current
The current into* the V
CC
supply terminal of an integrated circuit
∆I
CC
Supply current change
The increase in supply current for each input that is at one of the specified TTL voltage levels rather
than 0 V or V
CC
I
CEX
Output high leakage current
The maximum leakage current into* an output that is in a high state and V
O
= V
CC
I
I(hold)
Input hold current
The input current that holds the input at the previous state when the driving device goes to the
high-impedance state
*Current out of a terminal is given as a negative value.*Current out of a terminal is given as a negative value.