器件名称: CD4008BMS
功能描述: CMOS 4-Bit Full Adder With Parallel Carry Out
文件大小: 67.35KB 共8页
简 介:CD4008BMS
November 1994
CMOS 4-Bit Full Adder With Parallel Carry Out
Pinout
CD4008BMS TOP VIEW
Features
High-Voltage Type (20V Rating) 4 Sum Outputs Plus Parallel Look-ahead Carry-Output High-Speed Operation - Sum In-To-Sum Out, 160ns Typ; Carry In-To-Carry Out, 5ns Typ. At VDD = 10V, CL=50pF Standardized Symmetrical Output Characteristics 100% Tested For Quiescent Current At 20V Maximum Input Current of 1a at 18V Over Full Package-Temperature Range; - 100nA at 18V and 25oC Noise Margin (Over Full Package Temperature Range): - 1V at VDD = 5V - 2V at VDD = 10V - 2.5V at VDD = 15V 5V, 10V and 15V Parametric Ratings Meets All Requirements of JEDEC Tentative Standard No. 13B, “Standard Specications for Description of ‘B’ Series CMOS Devices”
A4 1 B3 2 A3 3 B2 4 A2 5 B1 6 A1 7 VSS 8
16 VDD 15 B4 14 CO 13 S4 12 S3 11 S2 10 S1 9 C1
Logic Diagram
HIGH SPEED PAR CARRY B4 A4 B3 14 CO (CARRY-OUT) 13 SUM C4 12 3 4 5 6 7 9 SUM C3 SUM C2 SUM 10 S1 11 S2 VDD B1 A1 C1 S3 S4
* * * * * * * * *
15 1 2
Applications
Binary Addition/Arithmetic Units
A3 B2 A2
Description
CD4008BMS types consist of four full adder stages with fast look ahead carry provision from stage to stage. Circuitry is included to provide a fast “parallel-carry-out” but to permit high-speed operation in arithmetic sections using several CD4008BMS’s. CD4008BMS inputs include the four sets of bits to be added, A1 to A4 and B1 to B4, in addition to the “Carry In” bit from a previous section. CD4008BMS outputs ……
