HCC40181B Datasheet, PDF (2/12 Pages) STMicroelectronics – 4-BIT ARITHMETIC LOGIC UNIT

HCC/HCF40181B
P for the four bits of the HCC/HCF40181B. Use of
the HCC/HCF40182B look-ahead carry generator
in conjunction with multiple HCC/HCF40181B’s per-
mits high-speed arithmetic operations on long
words. A ripple carry output C_{n + 4} is available for use
in systems where speed is not of primary import-
ance. Also included in the HCC/HCF40181B is a
comparator output A = B, which assumes a high
FUNCTIONAL DIAGRAM
Active-low Data.
level whenever the two four-bit input words A and B
are equal and the device is in the subtract mode. In
addition, relative magnitude information may be
derived from the carry-in input Cn and ripple carry-
out output C_{n + 4} by placing the unit in the subtract
mode and externally decoding using the information
in table II. The HCC/HCF40181B is similar to indus-
try types MC 14581 and 74181.
Active-high Data.
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V _DD* Supply Voltage : HC C Types
H C F Types
– 0.5 to + 20
V
– 0.5 to + 18
V
V_i Input Voltage
I_I
DC Input Current (any one input)
– 0.5 to V_DD + 0.5
V
± 10
mA
P_{t o t} Total Power Dissipation (per package)
Dissipation per Output Transistor
for T_{o p} = Full Package-temperature Range
T _{o p} Operating Temperature : HCC Types
H CF Types
200
mW
100
mW
– 55 to + 125
°C
– 40 to + 85
°C
T_{s tg} Storage Temperature
– 65 to + 150
°C
Stresses above those listed under ”Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections
of this specification is not implied. Exposure to absolute maximum rating conditions for external periods may affect device reliability.
* All voltages are with respect to VSS (GND).
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