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74F280 데이터시트(PDF) 2 Page - NXP Semiconductors |
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74F280 데이터시트(HTML) 2 Page - NXP Semiconductors |
2 / 8 page Philips Semiconductors Product specification 74F280B 9-bit odd/even parity generator/checker 2 1996 Mar 12 853-0363 16555 FEATURES • High-impedance NPN base inputs for reduced loading (20 µA 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) DESCRIPTION The 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 14 13 12 11 10 9 8 7 6 5 4 3 2 1 VCC I5 I4 I3 I2 I1 I0 I6 I7 I8 ΣE GND NC ΣO SF00849 TYPE TYPICAL PROPAGATION DELAY TYPICAL SUPPLY CURRENT (TOTAL) 74F280B 5.5ns 26mA ORDERING INFORMATION DESCRIPTION COMMERCIAL RANGE VCC = 5V ±10%, Tamb = 0°C to +70°C INDUSTRIAL RANGE VCC = 5V ±10%, Tamb = –40°C to +85°C PKG. DWG. # 14-pin plastic DIP N74F280BN I74F280BN SOT27-1 14-pin plastic SO N74F280BD I74F280BD SOT108-1 INPUT AND OUTPUT LOADING AND FAN-OUT TABLE PINS DESCRIPTION 74F(U.L.) HIGH/LOW LOAD VALUE HIGH/LOW I0 - I8 Data inputs 1.0/0.033 20 µA/20µA ∑E, ∑O Parity outputs 50/33 1.0mA/20mA NOTE: One (1.0) FAST Unit Load is defined as: 20 µA in the High state and 0.6mA in the Low state. LOGIC SYMBOL 8 9 10 11 12 13 1 2 4 56 ΣO ΣE I0 I1 I2 I3 I4 I5 I6 I7 I8 SF00845 IEC/IEEE SYMBOL 8 9 10 11 12 13 1 2 4 5 6 ΣO ΣE VCC=Pin 14 GND=Pin 7 2K SF00846 |
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