74HC583 datasheet(2/13 Pages) PHILIPS

2 / 13 page

1998 Mar 31

Philips Semiconductors

Product speciﬁcation

4-bit full adder with fast carry

74HC/HCT583

FEATURES

• Adds two decimal numbers

• Full internal look-ahead

• Fast ripple carry for economical expansion

• Output capability: standard driver

• ICC category: MSI

GENERAL DESCRIPTION

The 74HC/HCT583 are high-speed Si-gate CMOS devices

and are pin compatible with low power Schottky TTL

(LSTTL). They are specified in compliance with JECEC

standard no. 7A.

The 74HC/HCT583 are high-speed 4-bit BCD full adders

with internal carry look-ahead. They accept two 4-bit

decimal numbers (A0 to A3 and B0 to B3) and a carry input

(CIN).

The “583” generates the decimal sum outputs (

∑

0 to ∑3)

and a carry output (Cn+4) if the sum is greater than 9.

If an addition of two BCD numbers produce a number

greater than 9, a valid BCD number and a carry will result.

For input values larger than 9, the number is converted

from binary to BCD. Binary to BCD conversion occurs by

grounding one set of inputs, An or Bn and applying a 4-bit

binary number to the other set of inputs. If the input is

between 0 and 9, a BCD number occurs at the output.

If the binary input falls between 10 and 15, a carry term is

generated. Both the carry term and the sum are the BCD

equivalent of the binary input. Converting binary numbers

greater than 16 may be achieved by cascading “583s”.

See the “283” for the binary version.

QUICK REFERENCE DATA

GND = 0 V; Tamb=25 °C; tr =tf =6ns

Notes

1. CPD is used to determine the dynamic power dissipation (PD in µW):

PD =CPD × VCC2 × fi + ∑ (CL × VCC2 × fo) where:

fi = input frequency in MHz

fo = output frequency in MHz

∑ (CL × VCC2 × fo) = sum of outputs

CL = output load capacitance in pF

VCC = supply voltage in V

2. For HC the condition is VI = GND to VCC

For HCT the condition is VI = GND to VCC − 1.5 V

SYMBOL

PARAMETER

CONDITIONS

TYPICAL

UNIT

HCT

tPHL/ tPLH

propagation delay

CL = 15 pF; VCC =5V

CIN to Cn+4

An, Bn to Cn+4

input capacitance

3.5

CPD

power dissipation capacitance per package

notes 1 and 2

116

120

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