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The NBC12439 is a general purpose, PLL based synthesized clock ource. The VCO will operate over a frequency range of 400 MHz to 00 MHz. The VCO frequency is sent to the N-output divider, where t can be configured to provide division ratios of 1, 2, 4 or 8. The VCO nd output frequency can be programmed using the parallel or serial nterfaces to the configuration logic. The PLL loop filter is fully ntegrated and does not require any external components.
NBC12439 Maximum Ratings
Symbol
Parameter
Condition 1
Condition 2
Rating
Units
VCC
Positive Supply
GND = 0 V
-
6
V
VI
Input Voltage
GND = 0 V
VI VCC
6
V
Iout
Output Current
Continuous Surge
-
50 100
mA mA
TA
Operating Temperature Range
-
-
0 to +70
Tstg
Storage Temperature Range
-
-
-65 to +150
JA
Thermal Resistance (Junction to Ambient)
0 LFPM 500 LFPM
28 PLCC 28 PLCC
63.5 43.5
/W /W
JC
Thermal Resistance (Junction to Case)
std bd
28 PLCC
22 to 26
/W
JA
Thermal Resistance (Junction to Ambient)
0 LFPM 500 LFPM
32 LQFP
80 55
/W /W
JC
Thermal Resistance (Junction to Case)
std bd
32 LQFP
12 to 17
/W
Tsol
Wave Solder
< 3 sec @ 248
-
265
2. Maximum Ratings are those values beyond which device damage may occur.
NBC12439 Features
• Best-in-Class Output Jitter Performance, ±20 ps Peak-to-Peak • 50 MHz to 800 MHz Programmable Differential PECL Outputs • Fully Integrated Phase-Lock-Loop with Internal Loop Filter • Parallel Interface for Programming Counter and Output Dividers uring Power-Up • Minimal Frequency Overshoot • Serial 3-Wire Programming Interface • Crystal Oscillator Interface • Operating Range: VCC = 3.135 V to 5.25 V • CMOS and TTL Compatible Control Inputs • Pin Compatible with Motorola MC12439 • Power-Down of PECL Outputs (÷16)