74HC283D/AUJ View Datasheet(PDF) - NXP Semiconductors.

Part Name

Description

MFG CO.

74HC283D/AUJ

4-bit binary full adder with fast carry

NXP Semiconductors. 

Philips Semiconductors

12. Waveforms

74HC283

4-bit binary full adder with fast carry

CIN, An, Bn,

input

VM

Sn, COUT,

output

tPHL

VM

tPLH

tTHL

tTLH

001aab899

VM = 0.5 × VI.

Fig 6. Waveforms showing the inputs (CIN, An and Bn) to the outputs (Sn and COUT)

propagation delays and the output transition times

PULSE

VI

GENERATOR

VCC

VO

D.U.T.

RT

CL

mna101

Fig 7.

Test data is given in Table 9.

Definitions for test circuit:

RT = Termination resistance should be equal to output impedance Zo of the pulse generator.

CL = Load capacitance including jig and probe capacitance.

Load circuitry for switching times

Table 9:

Supply

VCC

2.0 V

4.5 V

6.0 V

5.0 V

Test data

Input

VI

VCC

VCC

VCC

VCC

tr, tf

6 ns

6 ns

6 ns

6 ns

Load

CL

50 pF

50 pF

50 pF

15 pF

13. Application information

Figure 8 shows a 3-bit adder using the 74HC283. Trying the operand inputs of the fourth

adder (A4 and B4) LOW makes S4 dependent on, and equal to, the carry from the third

adder.

Figure 9, based on the same principle, shows a method of dividing the 74HC283 into a

2-bit and 1-bit adder. The third stage adder (A3, B3 and S3) is used simply as means of

transferring the carry into the fourth stage (via A3 and B3) and transferring the carry from

9397 750 13811

Product data sheet

Rev. 03 — 11 November 2004

© Koninklijke Philips Electronics N.V. 2004. All rights reserved.

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