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參數(shù)資料
| 型號(hào)： | 935189020118 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 算術(shù)邏輯單元 |
| 英文描述： | HC/UH SERIES, 4-BIT ADDER/SUBTRACTOR, PDSO16 |
| 封裝： | PLASTIC, TSSOP-16 |
| 文件頁數(shù)： | 8/8頁 |
| 文件大?。?/td> | 59K |
| 代理商： | 935189020118 |
December 1990
8
Philips Semiconductors
Product specication
4-bit binary full adder with fast carry
74HC/HCT283
AC WAVEFORMS
Fig.6
Waveforms showing the inputs (CIN, An, Bn)
to the outputs (
∑n, COUT) propagation delays
and the output transition times.
(1) HC : VM = 50%; VI = GND to VCC.
HCT: VM = 1.3 V; VI = GND to 3 V.
APPLICATION INFORMATION
Fig.7 3-bit adder.
Fig.8 2-bit and 1-bit adder.
Fig.9 5-input encoder.
Fig.10 5-input majority gate.
Notes to Figs 7 to 10
Figure 7 shows a 3-bit adder using the “283”. Tying the
operand inputs of the fourth adder (A3, B3) LOW makes ∑3
dependent on, and equal to, the carry from the third adder.
Based on the same principle, Figure 8 shows a method of
dividing the “283” into a 2-bit and 1-bit adder. The third
stage adder (A2, B2, ∑ 2) is used simply as means of
transferring the carry into the fourth stage (via A2 and B2)
and transferring the carry from the second stage on
∑ 2.
Note that as long as long as A2 and B2 are the same, HIGH
or LOW, they do not influence
∑ 2. Similarly, when A2 and
B2 are the same, the carry into the third stage does not
influence the carry out of the third stage. Figure 9 shows a
method of implementing a 5-input encoder, where the
inputs are equally weighted. The outputs
∑
0, ∑1 and ∑ 2
produce a binary number equal to the number inputs (I1 to
I5) that are HIGH. Figure 10 shows a method of
implementing a 5-input majority gate. When three or more
inputs (I1 to I5) are HIGH, the output M5 is HIGH.
PACKAGE OUTLINES
See
“74HC/HCT/HCU/HCMOS Logic Package Outlines”.
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