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8737AGI-11LFT

P1-P3P4-P6P7-P9P10-P12P13-P15
LOW SKEW ÷1/÷2
DIFFERENTIAL-TO- 3.3V LVPECL CLOCK GENERATOR
8737I-11 DATA SHEET
10 REVISION C 7/16/15
3. Calculations and Equations.
LVPECL output driver circuit and termination are shown in Figure 4.
To calculate worst case power dissipation into the load, use the following equations which assume a 50Ω load, and a
termination
voltage of V
CC
- 2V.
• For logic high, V
OUT
= V
OH_MAX
= V
CC_MAX
– 0.9V
(V
CC_MAX
- V
OH_MAX
)
= 0.9V
• For logic low, V
OUT
= V
OL_MAX
= V
CC_MAX
– 1.7V
(V
CC_MAX
- V
OL_MAX
)
= 1.7V
Pd_H is power dissipation when the output drives high.
Pd_L is the power dissipation when the output drives low.
Pd_H = [(V
OH_MAX
– (V
CC_MAX
- 2V))/R
L
] * (V
CC_MAX
- V
OH_MAX
) = [(2V - (V
CC_MAX
- V
OH_MAX
))
/R
L
] * (V
CC_MAX
- V
OH_MAX
) =
[(2V - 0.9V)/50Ω] * 0.9V = 19.8mW
Pd_L = [(V
OL_MAX
– (V
CC_MAX
- 2V))/R
L
] * (V
CC_MAX
- V
OL_MAX
) = [(2V - (V
CC_MAX
- V
OL_MAX
))
/R
L
] * (V
CC_MAX
- V
OL_MAX
) =
[(2V - 1.7V)/50Ω] * 1.7V = 10.2mW
Total Power Dissipation per output pair = Pd_H + Pd_L = 30mW
FIGURE 4. LVPECL DRIVER CIRCUIT AND T ERMINATION
REVISION C 7/16/15
8737I-11 DATA SHEET
11 LOW SKEW ÷1/÷2
DIFFERENTIAL-TO- 3.3V LVPECL CLOCK GENERATOR
RELIABILITY INFORMATION
TRANSISTOR COUNT
The transistor count for 8737I-11 is: 510
TABLE 7. θ
JA
VS. AIR FLOW TABLE FOR 20 LEAD TSSOP
θ
JA
by Velocity (Linear Feet per Minute)
0 200 500
Single-Layer PCB, JEDEC Standard Test Boards 114.5°C/W 98.0°C/W 88.0°C/W
Multi-Layer PCB, JEDEC Standard Test Boards 73.2°C/W 66.6°C/W 63.5°C/W
NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs.
LOW SKEW ÷1/÷2
DIFFERENTIAL-TO- 3.3V LVPECL CLOCK GENERATOR
8737I-11 DATA SHEET
12 REVISION C 7/16/15
PACKAGE OUTLINE - G SUFFIX FOR 20 LEAD TSSOP
TABLE 8. PACKAGE DIMENSIONS
Reference Document: JEDEC Publication 95, MO-153
SYMBOL
Millimeters
Minimum Maximum
N20
A -- 1.20
A1 0.05 0.15
A2 0.80 1.05
b 0.19 0.30
c 0.09 0.20
D 6.40 6.60
E 6.40 BASIC
E1 4.30 4.50
e 0.65 BASIC
L 0.45 0.75
α
0° 8°
aaa -- 0.10
P1-P3P4-P6P7-P9P10-P12P13-P15

8737AGI-11LFT

Mfr. #:
Buy 8737AGI-11LFT
Manufacturer:
IDT
Description:
Clock Generators & Support Products 1:4 LVPECL Fanout Buffer
Lifecycle:
New from this manufacturer.
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