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1 / 12 page M54HC182 M74HC182 March 1993 FUNCTION LOOK AHEAD CARRY GENERATOR B1R (Plastic Package) ORDER CODES : M54HC182F1R M74HC182M1R M74HC182B1R M74HC182C1R F1R (Ceramic Package) M1R (Micro Package) C1R (Chip Carrier) PIN CONNECTIONS (top view) NC = No Internal Connection DESCRIPTION . HIGH SPEED tPD = 14 ns (TYP.) at VCC =5 V . LOW POWER DISSIPATION ICC =4 µA (MAX.) at TA =25 °C . HIGH NOISE IMMUNITY VNIH =VNIL =28 % VCC (MIN.) . OUTPUT DRIVE CAPABILITY 10 LSTTL LOADS . SYMMETRICAL OUTPUT IMPEDANCE IOH =IOL = 4 mA (MIN.) . BALANCED PROPAGATION DELAYS tPLH =tPHL . WIDE OPERATING VOLTAGE RANGE VCC (OPR) = 2 V to 6 V . PIN AND FUNCTION COMPATIBLE WITH 54/74LS182 The M54/74HC182 is a high speed CMOS FUNC- TION LOOK AHEAD CARRY GENERATOR fabricated in silicon gate C 2MOS technology. It has the same high speed performance of LSTTL com- bined with true CMOS low power consumption. These circuit are capable of anticipating a carry across four binary adders or group of adders. They are cascadable to perform full look-ahead across n- bit adders. Carry, generate-carry, and propagate-carry functions are provided as shown in the pin connection table. When used in conjunction with the HC181 arithmetic logic unit, these gener- ators provide high-speed carry look-ahead capability for any word length. Each HC182 gener- ates the look-ahead (anticipated carry) across a group of four ALU’s and, in addition, other carry look- ahead circuits may be employed to anticipate carry across sections of four look-ahead packages up to n-bits. The method of cascading circuits to perform multi-level look-ahead is illustrated under typical ap- plication data. Carry input and output of the ALUs are in their true form, and the carry propagate (P) and carry gener- ate (G) are in negated form ; therefore, the carry functions (inputs, outputs, generate, and propagate) of the look-ahead generators are implemented in the compatible forms for direct connection to the ALU. Reinterpretation of carry functions as ex- plained on the HC181 data sheet are also applicable to and compatible with the look-ahead generator. All inputs are equipped with protection circuits against static discharge and transient excess voltage. 1/12 |
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