MC74F181 Motorola, MC74F181 Datasheet - Page 3

• Manufacturer Part Number: MC74F181
• Description: 4-BIT ARITHMETIC LOGIC UNIT FAST SCHOTTKY TTL
• Manufacturer: Motorola

DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE
NOTES:
(ALU). Controlled by the four Function Select inputs (S 0 – S 3 )
and the Mode Control input (M), it can perform all the 16 pos-
sible logic operations or 16 different arithmetic operations on
active-HIGH or active-LOW operands. The Function Table
lists these operations.
are inhibited and the device performs logic operations on the
individual bits as listed. When the Mode Control input is LOW,
the carries are enabled and the device performs arithmetic op-
erations on the two 4-bit words. The device incorporates full in-
ternal carry lookahead and provides for either ripple carry be-
tween devices using the C n + 4 output, or for carry lookahead
between packages using the signals P (Carry Propagate) and
G (Carry Generate). In the Add mode, P indicates that F is 15
or more, while G indicates that F is 16 or more. In the Subtract
mode, P indicates that F is zero or less, while G indicates that
F is less than zero. P and G are not affected by carry in. When
speed requirements are not stringent, it can be used in a sim-
ple Ripple Carry mode by connecting the Carry output (C n + 4 )
signal to the Carry input (C n ) of the next unit. For high-speed
operation the device is used in conjunction with a carry looka-
head circuit. One carry lookahead package is required for
V IH
V IL
V IK
I OH
V OH
V OH
V OL
I IH
I IH
I IL
I IL
I IL
I OS
I CC
1. For conditions such as MIN or MAX, use the appropriate value specified under guaranteed operating ranges.
2. Not more than one output should be shorted at a time, nor for more than 1 second.
The F181 is a 4-bit high-speed parallel Arithmetic Logic Unit
When the Mode Control input (M) is HIGH, all internal carries
Symbol
Input HIGH Voltage
Input LOW Voltage
Input Clamp Diode Voltage
Output Current — HIGH
Output HIGH Voltage
Output HIGH Voltage
Output LOW Voltage
Input HIGH Current
Input HIGH Current
Input LOW Current
Input LOW Current
Input LOW Current
Output Short Circuit
Current (Note 2)
Power Supply Current
Parameter
M Input
A and B Inputs
S 0 – 3 Inputs
C n Input
54, 74
FUNCTIONAL DESCRIPTION
74
FAST AND LS TTL DATA
MC54/74F181
– 60
Min
2.0
2.5
2.7
4-94
Limits
0.35
Typ
3.4
3.4
43
each group of four F181 devices. Carry lookahead can be pro-
vided at various levels and offers high-speed capability over
extremely long word lengths.
F outputs are HIGH and can be used to indicate logic equiva-
lence over four bits when the unit is in the Subtract mode. The
A = B output is open collector and can be wired-AND with other
A = B outputs to give a comparison for more than four bits. The
A = B signal can be used with the C n + 4 signal to indicate A >
B and A < B.
performed without a carry in. An incoming carry adds a one to
each operation. Thus, select code LHHL generates A minus
B minus 1 (2s complement notation) without a carry in and
generates A minus B when a carry is applied. Because sub-
traction is actually performed by complementary addition (1s
complement), a carry out means borrow; thus a carry is gener-
ated when there is no underflow and no carry is generated
when there is underflow. As indicated, this device can be used
with either active-LOW inputs producing active-LOW outputs
or with active-HIGH inputs producing active-HIGH outputs.
For either case the table lists the operations that are performed
to the operands labeled inside the logic symbol.
The A = B output from the device goes HIGH when all four
The Function Table lists the arithmetic operations that are
–150
– 0.6
– 2.4
– 3.0
Max
–1.2
–1.8
250
100
0.8
0.5
20
65
(unless otherwise specified)
Unit
mA
mA
mA
mA
mA
mA
V
V
V
V
V
V
A
A
A
Guaranteed Input HIGH Voltage
Guaranteed Input LOW Voltage
I IN = –18 mA
V OH = 5.5 V
I OH = –1.0 mA
I OH = –1.0 mA
I OL = 20 mA
V IN = 2.7 V
V IN = 7.0 V
V IN = 0.5 V
V IN = 0.5 V
V IN = 0.5 V
V OUT = 0 V
V CC = MAX
Test Conditions
V CC = MIN
V CC = MIN, A = B
V CC = 4.5 V
V CC = 4.75 V
V CC = MIN
V CC = MAX
V CC = MAX
V CC = MAX
V CC = MAX
V CC = MAX
V CC = MAX