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參數(shù)資料
| 型號(hào)： | 933825630005 |
| 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, UUC |
| 封裝： | CHIP ON WAFER |
| 文件頁(yè)數(shù)： | 2/8頁(yè) |
| 文件大小： | 59K |
| 代理商： | 933825630005 |
December 1990
2
Philips Semiconductors
Product specication
4-bit binary full adder with fast carry
74HC/HCT283
FEATURES
High-speed 4-bit binary addition
Cascadable in 4-bit increments
Fast internal look-ahead carry
Output capability: standard
ICC category: MSI
GENERAL DESCRIPTION
The 74HC/HCT283 are high-speed Si-gate CMOS devices
and are pin compatible with low power Schottky TTL
(LSTTL). They are specified in compliance with JEDEC
standard no. 7A.
The 74HC/HCT283 add two 4-bit binary words (An plus Bn)
plus the incoming carry. The binary sum appears on the
sum outputs (
∑1 to ∑4) and the out-going carry (COUT)
according to the equation:
CIN + (A1 + B1) + 2(A2 + B2) ++4(A3 + B3) + 8(A4 + B4)=
=
∑1 + 2∑2 + 4∑3 + 8∑4 + 16COUT
Where (
+) = plus.
Due to the symmetry of the binary add function, the “283”
can be used with either all active HIGH operands (positive
logic) or all active LOW operands (negative logic); see
function table. In case of all active LOW operands the
results
∑1 to ∑4 and COUT should be interpreted also as
active LOW. With active HIGH inputs, CIN must be held
LOW when no “carry in” is intended. Interchanging inputs
of equal weight does not affect the operation, thus CIN, A1,
B1 can be assigned arbitrarily to pins 5, 6, 7, etc.
See the “583” for the BCD version.
QUICK REFERENCE DATA
GND = 0 V; Tamb =25 °C; tr =tf = 6 ns
Notes
1. CPD is used to determine the dynamic power dissipation (PD in W):
PD =CPD × VCC2 × fi +∑ (CL × VCC2 × fo) where:
fi = input frequency in MHz
fo = output frequency in MHz
∑ (CL × VCC2 × fo) = sum of outputs
CL = output load capacitance in pF
VCC = supply voltage in V
2. For HC the condition is VI = GND to VCC
For HCT the condition is VI = GND to VCC 1.5 V
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
HC
HCT
tPHL/ tPLH
propagation delay
CL = 15 pF; VCC =5 V
CIN to ∑1
16
15
ns
CIN to ∑2
18
21
ns
CIN to ∑3
20
23
ns
CIN to ∑4
23
27
ns
An or Bn to ∑n
21
25
ns
CIN to COUT
20
23
ns
An or Bn to COUT
20
24
ns
CI
input capacitance
3.5
pF
CPD
power dissipation capacitance per package
notes 1 and 2
88
92
pF
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