ICS8633AF-01LFT IDT, Integrated Device Technology Inc, ICS8633AF-01LFT Datasheet - Page 10

• Manufacturer Part Number: ICS8633AF-01LFT
• Description: IC BUFFER ZD 1-3 LVPECL 28-SSOP
• Manufacturer: IDT, Integrated Device Technology Inc
• Series: HiPerClockS™r
• Type: Fanout Distribution, Multiplexer , Zero Delay Bufferr

Specifications of ICS8633AF-01LFT

• Pll: Yes with Bypass
• Input: HCSL, LVDS, LVHSTL, LVPECL, SSTL
• Output: LVPECL
• Number Of Circuits: 1
• Ratio - Input:output: 2:3
• Differential - Input:output: Yes/Yes
• Frequency - Max: 700MHz
• Divider/multiplier: Yes/No
• Voltage - Supply: 3.135 V ~ 3.465 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 28-SSOP
• Frequency-max: 700MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 8633AF-01LFT

This section provides information on power dissipation and junction temperature for the ICS8633-01.
Equations and example calculations are also provided.
1. Power Dissipation.
The total power dissipation for the ICS8633-01 is the sum of the core power plus the power dissipated in the load(s).
The following is the power dissipation for V
NOTE: Please refer to Section 3 for details on calculating power dissipated in the load.
2. Junction Temperature.
Junction temperature, Tj, is the temperature at the junction of the bond wire and bond pad and directly affects the reliability of the
device. The maximum recommended junction temperature for the devices is 125°C.
In order to calculate junction temperature, the appropriate junction-to-ambient thermal resistance
moderate air flow of 200 linear feet per minute and a multi-layer board, the appropriate value is 36°C/W per Table 7 below.
Therefore, Tj for an ambient temperature of 70°C with all outputs switching is:
This calculation is only an example. Tj will obviously vary depending on the number of loaded outputs, supply voltage, air flow,
and the type of board (single layer or multi-layer).
T
8633AF-01
ABLE
The equation for Tj is as follows: Tj =
Tj = Junction Temperature
Pd_total = Total Device Power Dissipation (example calculation is in section 1 above)
T
70°C + 0.610W * 36°C/W = 91.96°C. This is well below the limit of 125°C.
JA
A
7. T
= Ambient Temperature
= Junction-to-Ambient Thermal Resistance
Multi-Layer PCB, JEDEC Standard Test Boards
Power (core)
Power (outputs)
If all outputs are loaded, the total power is 3 * 30mW = 90mW
Total Power
HERMAL
R
ESISTANCE
MAX
_MAX
MAX
= V
(3.465V, with all outputs switching) = 519.75mW + 90mW = 609.75mW
= 30mW/Loaded Output pair
CC_MAX
JA
* I
FOR
EE_MAX
28-
JA
P
CC
= 3.465V * 150mA = 519.75mW
PIN
by Velocity (Linear Feet per Minute)
JA
= 3.3V + 5% = 3.465V, which gives worst case results.
* Pd_total + T
OWER
SSOP, F
ORCED
C
www.idt.com
A
ONSIDERATIONS
C
10
ONVECTION
49°C/W
0
1-
TO
-3 D
IFFERENTIAL
36°C/W
200
JA
Z
must be used. Assuming a
-
ERO
TO
ICS8633-01
30°C/W
-3.3V LVPECL
500
D
ELAY
REV. B AUGUST 2, 2010
B
UFFER