NBC12439FN datasheet(2/21 Pages) ONSEMI

Part #	NBC12439FN

Description	3.3V/5V Programmable PLL Synthesized Clock Generator

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Manufacturer	ONSEMI [ON Semiconductor]

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NBC12439, NBC12439A

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Figure 1. Block Diagram (28−Lead PLCC)

7−BIT B M

COUNTER

B 2

7−BIT SR

2−BIT SR

3−BIT SR

B 2

10−20MHz

S_LOAD

P_LOAD

S_DATA

S_CLOCK

XTAL1

XTAL2

OSC

4

5

PHASE

DETECTOR

28

7

LATCH

VCO

B N

(1, 2, 4, 8)

LATCH

400−800

MHz

FOUT

+3.3 or 5.0 V

21, 25

24

23

VCC

LATCH

TEST

20

+3.3 or 5.0 V

PLL_VCC

FREF

01

27

26

01

M[6:0]

7

8 → 14

N[1:0]

2

17, 18

22, 19

OE

6

FREF_EXT

3

XTAL_SEL

15

1

PWR_DOWN

2

POWER

DOWN

Table 1. Output Division

N [1:0]

Output Division

0 0

0 1

1 0

1 1

2

4

8

1

Table 2. XTAL_SEL And OE

Input

0

1

PWR_DOWN

XTAL_SEL

OE*

FOUT

FREF_EXT

Outputs Disabled

FOUT B 16

XTAL

Outputs Enabled

*When disabled, FOUT goes LOW, FOUT goes HIGH.

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