4585B データシートの表示（PDF） - NXP Semiconductors.

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4585B

4-bit magnitude comparator

NXP Semiconductors. 

HEF4585B

4-bit magnitude comparator

Rev. 6 — 21 November 2011

Product data sheet

1. General description

The HEF4585B is a 4-bit magnitude comparator that compares two 4-bit words, A and B,

and determines whether A is greater than B, A is equal to B, or A is less than B. Each

word has four parallel inputs (A0 to A3 and B0 to B3) with A3 and B3 being the most

significant inputs. Three outputs are provided: A greater than B (QA>B), A less than B

(QA<B) and A equal to B (QA=B). Three expander inputs (IA>B, IA<B, and IA=B) allow

cascading of the devices, to compare 8, 12, 16, ..., bits without external gates.

To operate a single device or a device in the least significant position in a cascaded chain,

the expander inputs are connected as follows: IA=B = IA>B = HIGH and IA<B = LOW. All

other cascaded devices have IA=B and IA<B connected to QA=B and QA<B respectively

of the previous (less significant) device in the chain, while input IA>B is connected to a

HIGH (see Figure 6). Operation is not restricted to pure binary code; the devices will work

with any monotonic code. Table 3 describes the operation of the device under all possible

logic conditions.

It operates over a recommended VDD power supply range of 3 V to 15 V referenced to VSS

(usually ground). Unused inputs must be connected to VDD, VSS, or another input.

2. Features and benefits

 Fully static operation

 5 V, 10 V, and 15 V parametric ratings

 Standardized symmetrical output characteristics

 Specified from 40 C to +85 C

 Complies with JEDEC standard JESD 13-B

3. Ordering information

Table 1. Ordering information

All types operate from 40 C to +85 C

Type number

Package

Name Description

HEF4585BP

DIP16 plastic dual in-line package; 16 leads (300 mil)

HEF4585BT

SO16 plastic small outline package; 16 leads; body width 3.9 mm

Version

SOT38-4

SOT109-1

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