OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

841654AGILF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
REVISION A 4/20/15
841654 DATA SHEET
13 FEMTOCLOCKS™ CRYSTAL-TO-HCSL
CLOCK GENERATOR
3. Calculations and Equations.
The purpose of this section is to calculate power dissipation on the IC per HCSL output pair.
HCSL output driver circuit and termination are shown in Figure 4.
HCSL is a current steering output which sources a maximum of 17mA of current per output. To calculate worst case on-chip power
dissipation, use the following equations which assume a 50Ω load to ground.
The highest power dissipation occurs when V
DD
is HIGH.
Power = (V
DD_HIGH
– V
OUT
) * I
OUT,
since V
OUT
= I
OUT
* R
L
= (V
DD_HIGH
– I
OUT
*
R
L
) * I
OUT
= (3.465V – 17mA * 50Ω) * 17mA
Total Power Dissipation per output pair = 50.06mW
FIGURE 4. HCSL DRIVER CIRCUIT AND TERMINATION
V
DD
V
OUT
R
L
50
IC
I
OUT
= 17mA
R
REF
=
475
± 1%
FEMTOCLOCKS™ CRYSTAL-TO-HCSL
CLOCK GENERATOR
841654 DATA SHEET
14 REVISION A 4/20/15
RECOMMENDED TERMINATION
Figure 5A is the recommended termination for applications which
require the receiver and driver to be on a separate PCB. All traces
should be 50Ω impedance.
FIGURE 5A. RECOMMENDED TERMINATION
Figure 5B is the recommended termination for applications which
require a point to point connection and contain the driver and
receiver on the same PCB. All traces should all be 50Ω impedance.
FIGURE 5B. RECOMMENDED TERMINATION
REVISION A 4/20/15
841654 DATA SHEET
15 FEMTOCLOCKS™ CRYSTAL-TO-HCSL
CLOCK GENERATOR
RELIABILITY INFORMATION
TRANSISTOR COUNT
The transistor count for 841654 is: 2954
TABLE 8. θ
JA
VS. AIR FLOW TABLE FOR 28 LEAD TSSOP
θ
JA
by Velocity (Meters per Second)
0 1 2.5
Multi-Layer PCB, JEDEC Standard Test Boards 64.5°C/W 60.4°C/W 58.5°C/W
PACKAGE OUTLINE - G SUFFIX FOR 28 LEAD TSSOP TABLE 9. PACKAGE DIMENSIONS
Reference Document: JEDEC Publication 95, MO-153
SYMBOL
Millimeters
Minimum Maximum
N28
A -- 1.20
A1 0.05 0.15
A2 0.80 1.05
b 0.19 0.30
c 0.09 0.20
D 9.60 9.80
E 8.10 BASIC
E1 6.00 6.20
e 0.65 BASIC
L 0.45 0.75
α
0° 8°
aaa -- 0.10
PACKAGE OUTLINE AND PACKAGE DIMENSIONS
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

841654AGILF

Mfr. #:
Buy 841654AGILF
Manufacturer:
IDT
Description:
Clock Generators & Support Products 4 HCSL OUT SYNTHESIZER
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet