1

Standard Products

UT54ACS85/UT54ACTS85

4-Bit Comparators

Datasheet

November 2010

www.aeroflex.com/logic

FEATURES

1.2μ CMOS

- Latchup immune

High speed

Low power consumption

Single 5 volt supply

Available QML Q or V processes

Flexible package

- 16-pin DIP

- 16-lead flatpack

UT54ACS85 - SMD 5962-96536

UT54ACTS85 - SMD 5962-96537

DESCRIPTION

The UT54ACS85 and the UT54ACTS85 are 4-bit magnitude

comparators that perform comparison of straight binary and

straight BCD (8-4-2-1) codes. Three fully decoded decisions

about two 4-bit words (A, B) are made and are externally avail-

able at three outputs. Devices are fully expandable to any num-

ber of bits without external gates. The cascading paths of the

devices are implemented with only a two-gate-level delay to

reduce overall comparison times for long words. An alternate

method of cascading which further reduces the comparison time

is shown in the typical application data.

The devices are characterized over full military temperature

range of -55

°C to +125°C.

LOGIC SYMBOL

PINOUTS

16-Pin DIP

Top View

16-Lead Flatpack

Top View

(5)

(A>B)OUT

(10)

A0

(12)

A1

(13)

A2

0

(6)

(A=B)OUT

(7)

(A<B)OUT

COMP

<

=

>

A

(15)

A3

(2)

(A<B)IN

(3)

(A=B)IN

(4)

(A>B)IN

(9)

B0

(11)

B1

(14)

B2

(1)

B3

3

<

=

>

0

B

3

Note:

1. Logic symbol in accordance with ANSI/IEEE standard 91-1984 and IEC

Publication 617-12.

1

2

3

4

5

7

6

16

15

14

13

12

10

11

B3

(A<B)IN

(A=B)IN

(A>B)IN

(A>B)OUT

(A=B)OUT

(A<B)OUT

A3

B2

A2

A1

B1

A0

8

9

B0

1

2

3

4

5

7

6

16

15

14

13

12

10

11

B3

(A<B)IN

(A=B)IN

(A>B)IN

(A>B)OUT

(A=B)OUT

(A<B)OUT

A3

B2

A2

A1

B1

A0

B0

89