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74HC182 PDF даташит

Спецификация 74HC182 изготовлена ​​​​«Philips» и имеет функцию, называемую «Look-ahead carry generator».

Детали детали

Номер произв 74HC182
Описание Look-ahead carry generator
Производители Philips
логотип Philips логотип 

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74HC182 Даташит, Описание, Даташиты
INTEGRATED CIRCUITS
DATA SHEET
For a complete data sheet, please also download:
The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications
The IC06 74HC/HCT/HCU/HCMOS Logic Package Information
The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines
74HC/HCT182
Look-ahead carry generator
Product specification
File under Integrated Circuits, IC06
December 1990









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74HC182 Даташит, Описание, Даташиты
Philips Semiconductors
Look-ahead carry generator
Product specification
74HC/HCT182
FEATURES
Provides carry look-ahead across a group of four ALU’s
Multi-level look-ahead for high-speed arithmetic
operation over long word length
Output capability: standard
ICC category: MSI
GENERAL DESCRIPTION
The 74HC/HCT182 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/HCT182 carry look-ahead generators accept
up to four pairs of active LOW carry propagate (P0, P1, P2,
P3) and carry generate (G0, G1, G2, G3) signals and an
active HIGH carry input (Cn). The devices provide
anticipated active HIGH carries (Cn+x, Cn+y, Cn+z) across
four groups of binary adders.
The “182” also has active LOW carry propagate (P) and
carry generate (G) outputs which may be used for further
levels of look-ahead.
The logic equations provided at the outputs are:
Cn+x = G0 + P0Cn
Cn+y = G1 + P1G0 + P1P0Cn
Cn+z = G2 + P2G1 + P2P1G0 + P2P1P0Cn
G = G3 + P3G2 + P3P2G1 + P3P2P1GO
P = P3P2P1P0
The “182” can also be used with binary ALU’s in an active
LOW or active HIGH input operand mode. The
connections to and from the ALU to the carry look-ahead
generator are identical in both cases.
QUICK REFERENCE DATA
GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns
SYMBOL PARAMETER
CONDITIONS
tPHL/ tPLH
CI
CPD
propagation delay
Pn to P
Cn to any output
Pn or Gn to any output
input capacitance
power dissipation capacitance per
package
CL = 15 pF; VCC = 5 V
notes 1 and 2
Notes
1. CPD is used to determine the dynamic power dissipation (PD in µW):
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
TYPICAL
HC HCT
UNIT
11 14 ns
17 21 ns
14 17 ns
3.5 3.5 pF
50 50 pF
ORDERING INFORMATION
See “74HC/HCT/HCU/HCMOS Logic Package Information”.
December 1990
2









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74HC182 Даташит, Описание, Даташиты
Philips Semiconductors
Look-ahead carry generator
PIN DESCRIPTION
PIN NO.
3, 1, 14, 5
4, 2, 15, 6
7
8
9
10
11
12
13
16
SYMBOL
G0 to G3
P0 to P3
P
GND
Cn+z
G
Cn+y
Cn+x
Cn
VCC
NAME AND FUNCTION
carry generate inputs (active LOW)
carry propagate inputs (active LOW)
carry propagate output (active LOW)
ground (0 V)
function output
carry generate output (active LOW)
function output
function output
carry input (active HIGH)
positive supply voltage
Product specification
74HC/HCT182
Fig.1 Pin configuration.
Fig.2 Logic symbol.
Fig.3 IEC logic symbol.
December 1990
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