USE ULTRA37000™
FOR ALL NEW DESIGNS
CY7C344B
32-Macrocell MAX® EPLD
densest EPLD of this size. Eight dedicated inputs and 16
bidirectional I/O pins communicate to one logic array block. In
the CY7C344B 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.
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
• Advanced 0.65-micron CMOS EPROM technology to
increase performance
The speed and density of the CY7C344B 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 CY7C344B to
replace multichip TTL solutions, whether they are
synchronous, asynchronous, combinatorial, or all three.
• 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 CY7C344B represents the
Logic Block Diagram[1]
Pin Configurations
HLCC
Top View
15(22) INPUT
15(23) INPUT
INPUT
1(8)
INPUT/CLK 2(9)
27(6)
28(7)
INPUT
INPUT
INPUT
INPUT
13(20)
14(21)
4
3
2
1
28 27 26
25
5
6
7
8
9
10
11
I/O
I/O
I/O
INPUT
INPUT
INPUT
INPUT/CLK
I/O
MACROCELL 2
MACROCELL 1
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)
24
23
22
21
20
19
INPUT
INPUT
INPUT
INPUT
I/O
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 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
I
O
O
B
A
L
I/O
12 13 14 1516 1718
C
O
N
T
B
U
S
R
O
L
CerDIP
Top View
INPUT
INPUT
1
28
27
26
25
24
23
22
21
20
19
18
17
16
15
INPUT/CLK
I/O
INPUT
I/O
2
3
4
I/O
I/O
I/O
I/O
5
6
7
I/O
I/O
V
CC
32
V
CC
64 EXPANDER PRODUCT TERM ARRAY
GND
I/O
GND
I/O
8
9
I/O
I/O
10
11
12
13
14
I/O
I/O
INPUT
I/O
I/O
INPUT
INPUT
INPUT
Selection Guide
7C344B-15
7C344B-20
7C344B-25
Unit
Maximum Access Time
15
20
25
ns
Note:
1. Number in () refers to J-leaded packages.
Cypress Semiconductor Corporation
Document #: 38-03036 Rev. *D
•
3901 North First Street
•
San Jose, CA 95134
•
408-943-2600
Revised June 6, 2005