LCMXO2280C-5TN144C LATTICE SEMICONDUCTOR, LCMXO2280C-5TN144C Datasheet - Page 174

• Manufacturer Part Number: LCMXO2280C-5TN144C
• Description: MACHXO PLD FLASH, SCRAM 1.8V, SMD
• Manufacturer: LATTICE SEMICONDUCTOR
• Series: MachXOr

Specifications of LCMXO2280C-5TN144C

• Cpld Type: FLASH
• No. Of Macrocells: 1140
• No. Of I/o's: 113
• Propagation Delay: 3.6ns
• Global Clock Setup Time: 1.1ns
• Frequency: 600MHz
• Supply Voltage Range: 1.71V To 3.465V
• Operating: RoHS Compliant

Lattice Semiconductor
Equations for generating Divider Settings and Output Frequency Ranges for Divider Mode Users
The divider names are abbreviated with legacy names as follows:
f
From the loop:
From the loop:
Substitute (1) in (2) yields:
Arrange (3):
From equation (4):
f
From the loop:
So, equation (5) becomes:
From the loop:
So, equation (6) becomes:
From equation (1):
Example: When CLKOS is Not Used
Assume: f
Then:
VCO
PFD
CLKI DIVIDER:
CLKFB DIVIDER:
CLKOP DIVIDER:
CLKOK DIVIDER:
f
f
f
f
f
f
f
f
f
f
f
Assume f
f
f
f
f
f
f
f
OUT
VCO
VCO
IN
INMIN
INMAX
PFD
IN
INMIN
INMIN
INMAX
INMAX
OUTMIN
OUTMAX
OUTKMIN
OUTKMAX
OUT
VCO
Constraint
Constraint
= (f
= f
= f
= f
= 40 * 3/2 = 60 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .within range
= f
= f
= 60 * 4 = 240 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . out of range
PFD
IN
VCO
= ((f
= f
= ((f
= (f
= f
= (f
IN
IN
OUT
IN
= f
= 40 MHz, M = 2, N = 3, V = 4
PFDMIN
= f
/M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (7)
INMAX
PFDMAX
= f
*M
* (N/M) . . . . . . . . . . . . . . . . . . . (1)
* (N/M) * V . . . . . . . . . . . . . . . . (3)
= f
VCOMAX
VCOMAX
VCOMIN
VCOMIN
/(V*N))*M . . . . . . . . . . . . . . . . (4)
INMIN
INMAX
* V . . . . . . . . . . . . . . . . . . . . (2)
OUTMIN
OUTMAX
=420
*(N/M), if below 25 * N round up to 25 * N . . . . . . . . . (12)
*M = 25 * M, (assume f
*(N/M), if above 420 round down to 420 . . . . . . . . . (13)
*M = 420 * M . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . (10)
/(V*N))*M . . . . . . . . . . (6)
/(V*N))*M, if above 420 round down to 420 . . . . . . (11)
/(V*N))*M . . . . . . . . . . (5)
/(V*N))*M, if below 25 * M round up to 25 * M . . . . . (9)
/K
M
N
V
K
/K
PFDMIN
= 25) . . . . . . . . . . . . . . (8)
10-12
Design and Usage Guide
MachXO sysCLOCK PLL