N74F181D

Philips Semiconductors FAST Products Product specification Arithmetic logic unit 74F181 FEATURES • Provides 16 arithmetic operation: add, subtract, compare, and double; plus 12 other arithmetic operations PIN CONFIGURATION B0 1 A0 S3 S2 S1 S0 Cn M 2 3 4 5 6 7 8 9 24 VCC 23 A1 22 B1 21 A2 20 B2 19 A3 18 B3 17 G 16 C n+4 15 P 14 A=B 13 F3 • Provides all 16 logic operations of two variables: Exclusive-OR, Compare, AND, NAND, NOR, OR, plus 10 other logic operations • Full look-ahead carry for high speed arithmetic operation on long words • 40% faster than ’S181 with only 30% ’S181 power consumption • Available in 300mil-wide Slim 24-pin Dual In-Line package DESCRIPTION The 74F181 is a 4-bit high-speed parallel Arithmetic Logic Unit (ALU). Controlled by the four Function Select inputs (S0–S3) and the Mode Control input (M), it can perform all the 16 possible logic operations or 16 different arithmetic operations on active-High or active-Low operands. The Function Table lists these operations. F0 F1 10 F2 11 GND 12 SF00193 TYPE 74F181 TYPICAL PROPAGATION DELAY 7.0ns TYPICAL SUPPLY CURRENT (TOTAL) 43mA ORDERING INFORMATION DESCRIPTION 24-Pin Plastic Slim DIP (300 mil) 24-Pin Plastic SOL COMMERCIAL RANGE VCC = 5V ±10%, Tamb = 0°C to +70°C N74F181N N74F181D INPUT AND OUTPUT LOADING AND FAN-OUT TABLE PINS A0–A3 B0–B3 M S0–S3 Cn Cn+4 P G A=B F0–F3 NOTE: DESCRIPTION A operand inputs B operand inputs Mode control input Function select input Carry input Carry output Carry Propagate output Carry Generate output Compare output Outputs 74F (U.L.) HIGH/LOW 1.0/3.0 1.0/3.0 1.0/1.0 1.0/4.0 1.0/5.0 50/33 50/33 50/33 OC/33 50/33 LOAD VALUE HIGH/LOW 20µA/1.8mA 20µA/1.8mA 20µA/0.6mA 20µA/2.4mA 20µA/3.0mA 1.0mA/20mA 1.0mA/20mA 1.0mA/20mA OC/20mA 1.0mA/20mA One (1.0) FAST unit load is defined as: 20µA in the High state and 0.6mA in the Low state. OC = Open Collector March 3, 1989 1 853–0351 95947 Philips Semiconductors FAST Products Product specification Arithmetic logic unit 74F181 LOGIC SYMBOL Active-High Operands 2 1 23 22 21 20 19 18 IEC/IEEE SYMBOL 6 5 4 3 0 M 4 CI P0 Q0 P1 Q1 P2 Q2 P3 Q3 ALU [T] 0 21 P=G CP CG CO 15 17 16 14 A0 B0 A1 B1 A2 B2 A3 B3 7 8 6 5 4 3 Cn M S0 S1 S2 S3 F0 F1 F2 F3 Cn+4 A=B G P 16 14 17 15 8 7 2 1 23 22 21 20 19 18 9 10 11 13 9 10 11 13 SF00197 Active-Low Operands 2 1 23 22 21 20 19 18 A0 B0 A1 B1 A2 B2 A3 B3 7 8 6 5 4 3 Cn M S0 S1 S2 S3 F0 F1 F2 F3 Cn+4 A=B G P 16 14 17 15 VCC = Pin 24 GND = Pin 12 9 10 11 13 SF00196 March 3, 1989 2 Philips Semiconductors FAST Products Product specification Arithmetic logic unit 74F181 LOGIC DIAGRAM S0 S1 S2 S3 B3 6 5 4 3 18 17 G 16 A3 19 Cn+4 B2 20 15 P A2 21 13 F3 B1 22 A1 23 11 F2 B0 1 14 A=B 10 A0 M Cn 2 8 9 7 F1 F0 VCC = Pin 24 GND = Pin 12 SF00194 March 3, 1989 3 Philips Semiconductors FAST Products Product specification Arithmetic logic unit 74F181 When the Mode Control input (M) is High, all internal carries are inhibited and the device performs logic operations on the individual bits as listed. When the Mode control input is Low, the carries are enabled and the device performs arithmetic operations on the two 4-bit words. The device incorporates full internal carry look-ahead and provides for either ripple carry between device using the Cn+4 output, or for carry look-ahead between packages using the signals P (Carry Propagate) and G (Carry Generate). P and G are not affected by carry in. When speed requirements are not stringent, it can be used in a simple ripple carry mode by connecting the Carry output (Cn+4) signal to the Carry input (Cn) of the next unit. For high-speed operation, the device is used in conjunction with the 74F182 carry look-ahead circuit. One carry look-ahead package is required for each group of four 74F181 devices. Carry look-ahead can be provided at various levels and offers high speed capability over extremely long word lengths. The A=B output from the device goes High when all four F outputs are High and can be used to indicate logic equivalence over 4-bits when the unit is in the subtract mode. The A=B output is open-collector and can be wired-AND with other A=B outputs to give a comparison for more than 4 bits. The A=B signal can also be used with the Cn+4 signal to indicate A>B and A