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74F182

Philips
Part Number 74F182
Manufacturer Philips
Description Look-ahead carry generator
Published May 28, 2005
Detailed Description Philips Semiconductors Product specification Look-ahead carry generator 74F182 FEATURES • Provides carry look-ahead...
Datasheet PDF File 74F182 PDF File

74F182
74F182

Overview
Philips Semiconductors Product specification Look-ahead carry generator 74F182 FEATURES • Provides carry look-ahead across a group of four ALUs • Multi-level look-ahead for high speed arithmetic operation over long word lengths PIN CONFIGURATION G1 P1 G0 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VCC P2 G2 Cn Cn+x Cn+y G Cn+z DESCRIPTION The 74F182 is a high speed carry look-ahead generator.
It accepts up to four pairs of active-Low Carry Propagate (P0, P1, P2, P3) and Carry Generate (G0, G1, G2, G3) signals and an active-High Carry input (Cn) and provides anticipated active-High carries (Cn+x, Cn+y, Cn+z) across four groups of binary adders.
The 74F182 also has active-Low Carry Propagate (P) Carry Generate (G) outputs which may be used for further levels of look-ahead.
The logic equations provided at the outputs are: Cn+x = G0+P0Cn Cn+y = G1+P1G0+P1P0Cn Cn+z = G2+P2G1+P2P1G0+P2P1P0Cn G = G3+P3G2+P3P2G1+P3P2P1G0 P = P3P2P1P0 The 74F182 can also be used with binary ALUs in an active-Low or active-High input operand mode.
The connections to and from the ALU to the carry look-ahead generator are identical in both cases.
P0 G3 P3 P GND SF00725 TYPE 74F182 TYPICAL PROPAGATION DELAY 5.
0ns TYPICAL SUPPLY CURRENT (TOTAL) 21mA ORDERING INFORMATION ORDER CODE DESCRIPTION 16-pin plastic DIP 16-pin plastic SO COMMERCIAL RANGE VCC = 5V ±10%, Tamb = 0°C to +70°C N74F182N N74F182D INPUT AND OUTPUT LOADING AND FAN-OUT TABLE PINS Cn G0, G2 G1 G3 P0, P1 P2 P3 Cn+x–Cn+z G P Carry input Carry generate inputs (active-Low) Carry generate input (active-Low) Carry generate input (active-Low) Carry propagate inputs (active-Low) Carry propagate input (active-Low) Carry propagate input (active-Low) Carry outputs Carry generate output (active-Low) Carry propagate output (active-Low) DESCRIPTION 74FAST (U.
L.
) HIGH/LOW 2.
5/2.
0 2.
5/14.
0 2.
5/16.
0 2.
5/8.
0 2.
5/8.
0 2.
5/6.
0 2.
5/4.
0 50/33 50/33 50/33 LOAD VALUE HIGH/LOW 50µA/1.
2mA 50µA/8.
4mA 50µA/9.
6mA 50µA/4.
8mA 50µA/4.
8mA 50µA/3.
6mA 50µA/2.
...


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