CY7C344

ALL NEW DESIGNS

Cypress Semiconductor Corporation

•

3901 North First Street

•

San Jose

•

408-943-2600

Document #: 38-03006 Rev. *B

Revised June 6, 2005

Features

• High-performance, high-density replacement for TTL,

74HC, and custom logic

• 32 macrocells, 64 expander product terms in one LAB

• 8 dedicated inputs, 16 I/O pins

• 0.8-micron double-metal CMOS EPROM technology

• 28-pin, 300-mil DIP, cerDIP or 28-pin HLCC, PLCC

package

Functional Description

Available in a 28-pin, 300-mil DIP or windowed J-leaded

ceramic chip carrier (HLCC), the CY7C344 represents the

densest EPLD of this size. Eight dedicated inputs and 16

bidirectional I/O pins communicate to one logic array block. In

the CY7C344 LAB there are 32 macrocells and 64 expander

product terms. When an I/O macrocell is used as an input, two

expanders are used to create an input path. Even if all of the

I/O pins are driven by macrocell registers, there are still 16

“buried” registers available. All inputs, macrocells, and I/O pins

are interconnected within the LAB.

The speed and density of the CY7C344 makes it a natural for

all types of applications. With just this one device, the designer

can implement complex state machines, registered logic, and

combinatorial “glue” logic, without using multiple chips. This

architectural flexibility allows the CY7C344 to replace

multichip TTL solutions, whether they are synchronous,

asynchronous, combinatorial, or all three.

Selection Guide

7C344-15

7C344-20

7C344-25

Unit

Maximum Access Time

15

20

25

ns

Maximum Operating Current

Commercial

200

200

200

mA

Military

220

220

Industrial

220

220

220

Maximum Standby Current

Commercial

150

150

150

mA

Military

170

170

Industrial

170

170

170

Note:

1. Numbers in () refer to J-leaded packages.

Logic Block Diagram

MACROCELL 2

MACROCELL 4

MACROCELL 6

MACROCELL 8

MACROCELL 10

MACROCELL 12

MACROCELL 14

MACROCELL 16

MACROCELL 18

MACROCELL 20

MACROCELL 22

MACROCELL 24

MACROCELL 26

MACROCELL 28

MACROCELL 30

MACROCELL 32

MACROCELL 1

MACROCELL 3

MACROCELL 5

MACROCELL 7

MACROCELL 9

MACROCELL 11

MACROCELL 13

MACROCELL 15

MACROCELL 17

MACROCELL 19

MACROCELL 21

MACROCELL 23

MACROCELL 25

MACROCELL 27

MACROCELL 29

MACROCELL 31

G

L

O

B

A

L

B

U

S

I

O

C

O

N

T

R

O

L

INPUT

INPUT

INPUT

INPUT

15(22)

15(23)

27(6)

28(7)

INPUT

1(8)

INPUT/CLK 2(9)

INPUT

13(20)

INPUT

14(21)

I/O

3(10)

I/O

4(11)

I/O

5(12)

I/O

6(13)

I/O

9(16)

I/O 10(17)

I/O 11(18)

I/O 12(19)

I/O 17(24)

I/O 18(25)

I/O 19(26)

I/O 20(27)

I/O

23(2)

I/O

24(3)

I/O

25(4)

I/O

26(5)

64 EXPANDER PRODUCT TERM ARRAY

32

Pin Configurations

Top View

HLCC

25

24

23

22

21

20

19

5

6

7

8

9

10

11

12 13 14 1516 1718

43 2

28 27 26

I/O

I/O

INPUT

INPUT

INPUT

I/O

I/O

INPUT

INPUT

INPUT/CLK

I/O

I/O

1

INPUT

INPUT

1

2

3

4

5

6

7

8

9

10

11

12

13

14

28

27

26

25

24

23

22

21

20

19

18

17

16

15

INPUT

INPUT

Top View

CerDIP

INPUT/CLK

I/O

I/O

I/O

I/O

GND

I/O

I/O

I/O

I/O

INPUT

INPUT

INPUT

I/O

I/O

I/O

I/O

GND

I/O

I/O

I/O

I/O

INPUT

INPUT

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