|Category||Logic => Arithmetic Functions => Bipolar->F Family|
|Description||74F382; Arithmetic Logic Unit|
|Company||Philips Semiconductors (Acquired by NXP)|
|Datasheet||Download 74F382 datasheet
Performs six arithmetic and logic functions Selectable Low (clear) and High (preset) functions Low-input loading minimizes drive requirements Carry output for ripple expansion Overflow output for Two's Complement arithmeticDESCRIPTION
The 74F382 performs three arithmetic and three logic operations on two 4-bit words, A and B. Two additional Select (S0S2) input codes force the Function outputs Low or High. An overflow output is provided for convenience in Two's Complement arithmetic. A carry output is provided for ripple expansion. For high-speed expansion using a carry look-ahead generator, refer to the 74F381 data sheet. Signals applied to the Select inputs, S0S2, determine the mode of operation, as indicated in the Function Select Table. An extensive listing of input and output levels is shown in the Function Table. The circuit performs the arithmetic functions for either active-HIgh or active-Low operands, with output levels in the same convention. In the subtract operating modes, it is necessary to force a carry (High for active-HIgh operands, Low for active-Low operands) into the Cn input of the least significant package. Ripple expansion is illustrated in Figure 1. The overflow output OVR is the Exclusive-OR of Cn+3 and Cn+4; a High signal on OVR indicates overflow in Two's complement operation (See Table 2 for Two's complement arithmetic). Typical delays for Figure 1 are given in Table 1. When the 74F382 is cascaded to handle word lengths longer than 4 bits, only the most significant overflow (OVR) output is used.
DESCRIPTION 20-pin plastic DIP 20-pin plastic SO COMMERCIAL RANGE VCC 5V ±10%, Tamb N74F382N N74F382D PKG DWG SOT146-1 SOT163-1
PINS Cn Cn+4 OVR A operand inputs B operand inputs Function select inputs Carry input Carry output Overflow output DESCRIPTION 74F (U.L.) HIGH/LOW LOAD VALUE HIGH/LOW 20µA/3.0mA 1.0mA/20mA
F0F3 Outputs NOTE: One (1.0) FAST unit load is defined 20µA in the High state and 0.6mA in the Low state.
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