ITT - Index of

GENERAL INFORMATION ITT54/74 SERIES TTL FAMilY
This series offers a wide range of digital integrated
circuit devices from simple NAN D gates to large
complex functions. They form a TTL family
(Transistor-Transistor Logic) guaranteed to operate
over the following ambient temperature ranges.
Military range. 54 series
Industrial range. 74 series
-15°Cto 125°C
O°C to 75°C
All devices operate over a frequency range between
D.C. and typically 20 M Hz. and are fully compatible
with all 5417 4 series TTL and 930 series DTL.
Clamping diodes are provided at the inputs to
enhance the inherent high noise immunity when
driving transmission lines. Most outputs are of
totem pole configuration to give good drive capability.
i.e. high fan-out, especially into large
capacitive loads. Other outputs include an opencircuit
collector connection.
For ease of reading. the data only refers to the
ITT7400 series family but it is equally applicable
to the ITT5400 series. Where there are exceptions
these are clearly indicated on the individual data
sheets concerned.
LOGIC DEFINITION
Positive logic is used throughout the data sheets.
This is defined as follows.
Logical '0'
2.0V
Low voltage; typically 0.2 V but
High voltage; typically 3.3 V but
Current flowing into a device terminal is defined as
positive.
FEATURES
High speed-typical propagation delay (gate) of
9 ns.
Guaranteed noise margin-greater than 400
mY.
Low power dissipation-l0 mW per gate at
50% duty cycle.
Worst case fan-out of 10.
Low output impedance.
Logic levels guaranteed over range of supply
voltage and operating temperature.
Wide range of functions-many SSI and MSI
functions.
Compatible with other DTL. TTL logic series.
D.C. CHARACTERISTICS COMMON TO ALL
DEVICES (except where otherwise stated)
D.C. tests are carried out under the specified conditions.
All inputs and outputs are tested for all possible
logic states. Worst state load currents and
voltages are applied and the test limits are applicable
over the full temperature range.
Min. Max. Unit
Supply voltage. VCC:
74 series 4.75 5.25 V
54 series 4.5 5.5 V
Operating temperature:
74 series 0 75 °c
54 series -55 125 °c
D.C. noise margin typically greater than 1 V.
INTRODUCTION TO TTL
The TTL circuit configurations are designed so that
the uniform logic and noise margin levels apply to
all the standard devices in the families. Thus many
parameters and their limits are common. In addition
the operating conditions are identified for each family.
Once these standard operating conditions are
understood it becomes possible for the designer to
use the family by simply referring to the logic and
connection diagrams on each data sheet. All i:om~
mon information is included in the remainder of this
section.
ABSOLUTE MAXIMUM RATINGS
(above which the useful life of the device may be
impaired)
Continuous supply voltage VCC (Note 1) ............. 7 V
Input voltage .......................................................... 5.5 V
Voltage between inputs ....................................... 5.5 V
Continuous input current ............................... -1 0 mA
Standard output voltage ....................... -0.5 to 5.5 V
Storage temperature! ..................... -65°C to 150°C
Note 1
This rating is reduced to 5.5 V if unused inputs are
connected directly to V CC.
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