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M74HC182M1R bảng dữ liệu(PDF) 1 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  FUNCTION LOOK AHEAD CARRY GENERATOR
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M54HC182
M74HC182
March 1993
FUNCTION LOOK AHEAD CARRY GENERATOR
B1R
(Plastic Package)
ORDER CODES :
M54HC182F1R
M74HC182M1R
M74HC182B1R
M74HC182C1R
F1R
(Ceramic Package)
M1R
(Micro Package)
C1R
(Chip Carrier)
PIN CONNECTIONS (top view)
NC =
No Internal
Connection
DESCRIPTION
.
HIGH SPEED
tPD = 14 ns (TYP.) at VCC =5 V
.
LOW POWER DISSIPATION
ICC =4
µA (MAX.) at TA =25 °C
.
HIGH NOISE IMMUNITY
VNIH =VNIL =28 % VCC (MIN.)
.
OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS
.
SYMMETRICAL OUTPUT IMPEDANCE
IOH =IOL = 4 mA (MIN.)
.
BALANCED PROPAGATION DELAYS
tPLH =tPHL
.
WIDE OPERATING VOLTAGE RANGE
VCC (OPR) = 2 V to 6 V
.
PIN AND FUNCTION COMPATIBLE
WITH 54/74LS182
The M54/74HC182 is a high speed CMOS FUNC-
TION LOOK AHEAD CARRY
GENERATOR
fabricated in silicon gate C
2MOS technology. It has
the same high speed performance of LSTTL com-
bined with true CMOS low power consumption.
These circuit are capable of anticipating a carry
across four binary adders or group of adders. They
are cascadable to perform full look-ahead across n-
bit
adders.
Carry,
generate-carry,
and
propagate-carry functions are provided as shown in
the pin connection table. When used in conjunction
with the HC181 arithmetic logic unit, these gener-
ators
provide
high-speed
carry
look-ahead
capability for any word length. Each HC182 gener-
ates the look-ahead (anticipated carry) across a
group of four ALU’s and, in addition, other carry look-
ahead circuits may be employed to anticipate carry
across sections of four look-ahead packages up to
n-bits. The method of cascading circuits to perform
multi-level look-ahead is illustrated under typical ap-
plication data.
Carry input and output of the ALUs are in their true
form, and the carry propagate (P) and carry gener-
ate (G) are in negated form ; therefore, the carry
functions (inputs, outputs, generate, and propagate)
of the look-ahead generators are implemented in
the compatible forms for direct connection to the
ALU. Reinterpretation of carry functions as ex-
plained on the HC181 data sheet are also applicable
to and compatible with the look-ahead generator. All
inputs are equipped with protection circuits against
static discharge and transient excess voltage.
1/12


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Mô tả tương tự - M74HC182M1R

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