nbc12439a ON Semiconductor, nbc12439a Datasheet - Page 2

• Manufacturer Part Number: nbc12439a
• Description: 3.3 V/5 V Programmable Pll Synthesized Clock Generator
• Manufacturer: ON Semiconductor

10-20MHz
FREF_EXT
XTAL_SEL
Table 1. Output Division
S_CLOCK
S_LOAD
P_LOAD
S_DATA
OE
N [1:0]
0 0
0 1
1 0
1 1
28
27
26
15
4
5
6
7
3
XTAL1
XTAL2
OSC
B 2
F
Output Division
7-BIT B M
REF
COUNTER
Figure 1. Block Diagram (28-Lead PLCC)
7- BIT SR
2
4
8
1
DETECTOR
PHASE
NBC12439, NBC12439A
0
8
LATCH
http://onsemi.com
14
M[6:0]
B 2
1
7
VCO
400-800
2
MHz
2- BIT SR
Table 2. XTAL_SEL And OE
PWR_DOWN
XTAL_SEL
PWR_DOWN
0
(1, 2, 4, 8)
POWER
LATCH
Input
DOWN
17, 18
2
OE
B N
N[1:0]
1
2
+3.3 or 5.0 V
PLL_V
22, 19
Outputs Disabled
1
3- BIT SR
FREF_EXT
LATCH
F
CC
OUT
0
V
CC
21, 25
24
23
20
Outputs Enabled
F
+3.3 or 5.0 V
OUT
XTAL
1
B 16
FOUT
FOUT
TEST