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74F280
9-bit odd/even parity generator/checker
Product specification
IC15 Data Handbook
1996 Mar 12
Philips Semiconductors Product specification
74F280B9-bit odd/even parity generator/checker
FEATURES High-impedance NPN base inputs for reduced loading
(20μA in Low and High states) Buffered inputs — one normalized load Word length easily expanded by cascading Industrial temperature range available (–40°C to +85°C)
DESCRIPTIONThe 74F280B is a 9-bit Parity Generator or Checker commonly used
to detect errors in high speed data transmission or data retrieval
systems. Both Even (∑E) and Odd (∑O) parity outputs are available
for generating or checking even or odd parity on up to 9 bits.
The Even (∑E) parity output is High when an even number of Data
inputs (I0 - I8) are High. The Odd (∑O) parity output is High when an
odd number of Data inputs are High.
Expansion to larger word sizes is accomplished by tying the Even
(∑E) outputs of up to nine parallel devices to the data inputs of the
final stage. This expansion scheme allows an 81-bit data word to be
checked in less than 20ns.
PIN CONFIGURATION
ORDERING INFORMATION
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
NOTE:One (1.0) FAST Unit Load is defined as: 20μA in the High state and 0.6mA in the Low state.
LOGIC SYMBOL
IEC/IEEE SYMBOL
Philips Semiconductors Product specification
74F280B9-bit odd/even parity generator/checker
LOGIC DIAGRAM
FUNCTION TABLE= High voltage level= Low voltage level
Philips Semiconductors Product specification
74F280B9-bit odd/even parity generator/checker
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED OPERATING CONDITIONS
DC ELECTRICAL CHARACTERISTICS(Over recommended operating free-air temperature range unless otherwise noted.)
NOTES: For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable type. All typical values are at VCC = 5V, Tamb = 25°C. Not more than one output should be shorted at a time. For testing IOS, the use of high-speed test apparatus and/or sample-and-hold
techniques are preferable in order to minimize internal heating and more accurately reflect operational values. Otherwise, prolonged shorting
of a High output may raise the chip temperature well above normal and thereby cause invalid readings in other parameter tests. In any
Philips Semiconductors Product specification
74F280B9-bit odd/even parity generator/checker
AC ELECTRICAL CHARACTERISTICS
AC WAVEFORMSFor all waveforms, VM=1.5V.
Waveform 1. Propagation Delay for Inverting Outputs
Waveform 2. Propagation Delay for Non-Inverting Outputs
TEST CIRCUIT AND WAVEFORM
Philips Semiconductors Product specification
74F280B9-bit parity odd/even parity generator/checker
DIP14: plastic dual in-line package; 14 leads (300 mil) SOT27-1
