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HCF40181BM1 View Datasheet(PDF) - STMicroelectronics

Part Name
Description
View to exact match
HCF40181BM1
ST-Microelectronics
STMicroelectronics ST-Microelectronics
HCF40181BM1 Datasheet PDF : 10 Pages
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HCF40181B
and P for the four bits of HCF40181B. Use of the
HCF40182B look-ahead carry generator in
conjunction with multiple HCF40181Bs permits
high-speed arithmetic operations on long words. A
ripple carry output Cn+4 is available for use in
systems where speed is not of primary
importance. Also included in HCF40181B is a
comparator output A = B, which assumes a high
level whenever the two four-bit input words A and
B are equal and the device is in subtract mode. In
addition, relative magnitude information may be
derived from the carry-in input Cn and ripple
carry-out output Cn+4 by placing the unit in the
subtract mode and externally decoding using the
information in table II. HCF40181B is similar to
industry types MC14581 and 74181.
INPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1, 22, 20, 18
2, 23, 21, 19
6, 5, 4, 3
9, 10, 11, 13
7
8
14
15
16
17
12
24
SYMBOL
B0 to B3
A0 to A3
S0 to S3
F0 to F3
Cn
M
A=B
P
Cn+4
G
VSS
VDD
NAME AND FUNCTION
Word B
Word A
Function Select Inputs
Output Function
Carry Input
Mode Control
Compare Output
Look Ahead Carry Out-
puts
Ripple Carry Output
Look Ahead Carry Out-
puts
Negative Supply Voltage
Positive Supply Voltage
FUNCTIONAL DIAGRAM
ACTIVE-LOW DATA
ACTIVE-HIGH DATA
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