CY2545C005

CY2545
CY2547

Document #: 001-13196 Rev. *A

Page 2 of 15

Pinouts

Figure 1.  Pin Diagram - CY2545 24 LD QFN

2

3

C

L

K

IN

/R

S

T

CLK1

PD#OE

CY2545

24

23

22

21

20

19

18

17

16

15

14

13

1

2

3

4

5

6

7

8

9

10

11

12

GN

D

GND

VDD_CLK_B1

DNU

CLK2

S

D

A

S

C

L

C

L

K

3

/F

S

C

L

K

4

G

N

D

CLK5

VDD_CLK_B

CLK6/SSON

VDD_CLK_B

CLK7

GND

CL

K

8

V

D

D

X

O

U

T

X

IN

/

E

X

C

L

K

IN

G

N

D

24LD QFN

Table 1.  Pin Definition - CY2545 24 LD QFN (V

DD

 = 2.5V, 3.0V or 3.3V Supply)

Pin Number

Name

IO

Description

1

GND

Power

Power supply ground

2

CLK1

Output

Programmable clock output. Output voltage depends on Bank1 voltage

3

VDD_CLK_B1

Power

Power supply for Bank1 (CLK1, CLK2) output: 2.5V/3.0V/3.3V 

4

PD#/OE

Input

Multifunction programmable pin: Output enable or Power down mode

5

DNU

DNU

Do not use this pin

6

CLK2

Output

Programmable clock output. Output voltage depends on Bank1 voltage

7

GND

Power

Power supply ground

8

SCL

Input

Serial data clock

9

SDA

Input/Output

Serial data input/output

10

CLK3/FS

Output/Input

Multifunction programmable pin: Programmable clock output or frequency 
select input pin. Output voltage of CLK3 depends on Bank2 voltage

11

CLK4

Output

Programmable clock output. Output voltage depends on Bank2 voltage 

12

GND

Power

Power supply ground

13

CLK5

Output

Programmable clock output. Output voltage depends on Bank2 voltage

14

VDD_CLK_B2

Power

Power supply for Bank2 (CLK3, CLK4, CLK5) output: 2.5V/3.0V/3.3V

15

CLK6/SSON

Output/Input

Multifunction programmable pin: Programmable clock output or spread 
spectrum ON/OFF control input pin. Output voltage of CLK6 depends on 
Bank3 voltage

16

VDD_CLK_B3

Power

Power supply for Bank3 (CLK6, CLK7, CLK8) output: 2.5V/3.0V/3.3V

17

CLK7

Output

Programmable clock output. Output voltage depends on Bank3 voltage

18

GND

Power

Power supply ground

19

GND

Power

Power supply ground

20

CLK8

Output

Programmable clock output. Output voltage depends on Bank3 voltage

21

CLKIN/RST

Input/Input

Multifunction programmable pin. High true reset input or 2.5V/3.0V/3.3V 
external reference clock input. The signal level of CLKIN input must track 
V

DD

 power supply on pin 22.

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CY2545C005 Information:
Part No.
CY2545C005

RFQ

Description
TSBU
File Size
372387 bytes
Page Size
612 x 792 pts (letter)
All Pages
15
Manufacturer
Cypress Semiconductor
Homepage
http://www.cypress.com/
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