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74HCT182 Arkusz danych(PDF) 2 Page - NXP Semiconductors

Numer części 74HCT182
Szczegółowy opis  Look-ahead carry generator
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Producent  PHILIPS [NXP Semiconductors]
Strona internetowa  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74HCT182 Arkusz danych(HTML) 2 Page - NXP Semiconductors

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December 1990
2
Philips Semiconductors
Product specification
Look-ahead carry generator
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
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.
GG
3
P
3 G2
P
3 P2 G1
P
3 P2 P1 GO
++
+
=
PP
3 P2 P1 P0
=
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 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
ORDERING INFORMATION
See
“74HC/HCT/HCU/HCMOS Logic Package Information”.
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
HC
HCT
tPHL/ tPLH
propagation delay
Pn to P
Cn to any output
Pn or Gn to any output
CL = 15 pF; VCC =5 V
11
17
14
14
21
17
ns
ns
ns
CI
input capacitance
3.5
3.5
pF
CPD
power dissipation capacitance per
package
notes 1 and 2
50
50
pF


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