Texas Instruments SN74F283N Bruksanvisning

Texas Instruments Inte kategoriserad SN74F283N

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





SDFS069A − D2932, MARCH 1987 − REVISED OCTOBER 1993

2−1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443

•Full-Carry Look-Ahead Across the

Four Bits

•Systems Achieve Partial Look-Ahead

Performance With the Economy of Ripple

Carry

•Package Options Include Plastic

Small-Outline Packages, Ceramic Chip

Carriers, and Standard Plastic and Ceramic

300-mil DIPs

description

The ′F283 is a full adder that performs the addition

of two 4-bit binary words. The sum (Σ) outputs are

provided for each bit and the resultant carry (C4)

output is obtained from the fourth bit.

The device features full internal look-ahead

across all four bits generating the carry term C4 in

typically 5.7 ns. This capability provides the

system designer with partial look-ahead

performance at the economy and reduced

package count of a ripple-carry implementation.

The adder logic, including the carry, is

implemented in its true form. End-around carry

can be accomplished without the need for logic or

level inversion.

The ′F283 can be used with either all-active-high

(positive logic) or all-active-low (negative logic)

operands.

The SN54F283 is characterized for operation over

the full military temperature range of −55°C to

125°C. The SN74F283 is characterized for

operation from 0° °C to 70 C.

logic symbol†

A2 14

Σ1

Σ2

Σ3

Σ4

†This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.

Pin numbers shown are for the D, J, and N packages.

SN54F283 . . . J PACKAGE

SN74F283 . . . D OR N PACKAGE

(TOP VIEW)

3 2 1 20 19

9 10 11 12 13

Σ3

Σ1

SN54F283 . . . FK PACKAGE

(TOP VIEW)

4 B3

GND

NC − No internal connection

VCC

Σ2

Σ1

GND

VCC

Σ3

Σ4

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



SDFS069A − D2932, MARCH 1987 − REVISED OCTOBER 1993

2−2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251−1443

logic diagram (positive logic)

C0 7

Σ1

Σ2

Σ3

Σ4

Pin numbers shown are for the D, J, and N packages.



 



SDFS069A − D2932, MARCH 1987 − REVISED OCTOBER 1993

2−3

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443

FUNCTION TABLE

OUTPUTS

INPUTS WHEN C0 = L WHEN C0 = H

INPUTS

WHEN C2 = L WHEN C2 = H

A1 B1 A2 B2 1 2 C2 1 2 C2Σ Σ Σ Σ

A3 B3 A4 B4 3 4 C4 3 4 C4Σ Σ Σ Σ

L L L L L L L H L L

H L L L H L L L H L

L H L L H L L L H L

H H L L L H L H H L

L L H L L H L H H L

H L H L H H L L L H

L H H L H H L L L H

H H H L L L H H L H

L L L H L H L H H L

H L L H H H L L L H

L H L H H H L L L H

H H L H L L H H L H

L L H H L L H H L H

H L H H H L H L H H

L H H H H L H L H H

HHHHLHHHHH

NOTE: Input conditions at A1, B1, A2, B2, and C0 are used to determine outputs Σ1

and Σ2 and the value of the internal carry C2. The values at C2, A3, B3, A4,

and B4 are then used to determine outputs Σ Σ3, 4, and C4.

absolute maximum ratings over operating free-air temperature range (unless otherwise noted) †

Supply voltage range, VCC −0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage range (see Note 1) −1.2 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input current range −30 mA to 5 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Voltage range applied to any output in the high state −0.5 V to VCC

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Current into any output in the low state 40 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range: SN54F283 −55° °C to 125 C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SN74F283 0° °C to 70 C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range −65° °C to 150 C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .