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參數(shù)資料
| 型號： | BU7231G-TR |
| 廠商： | Rohm Semiconductor |
| 文件頁數(shù)： | 5/19頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC COMPARATOR SGL 5.5V SSOP-5 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | 通用 |
| 元件數(shù)： | 1 |
| 輸出類型： | 推挽式 |
| 電壓 - 電源，單路/雙路(±)： | 1.8 V ~ 5.5 V，±0.9 V ~ 2.75 V |
| 電壓 - 輸入偏移（最小值）： | 11mV @ 3V |
| 電流 - 輸入偏壓（最小值）： | 1pA @ 3V |
| 電流 - 輸出（標(biāo)準(zhǔn)）： | 6mA @ 3V |
| 電流 - 靜態(tài)（最大值）： | 15µA |
| CMRR, PSRR（標(biāo)準(zhǔn)）： | 80dB CMRR，80dB PSRR |
| 傳輸延遲（最大）： | 1.7µs |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 6-TFSOP（0.063"，1.60mm 寬），5 引線 |
| 安裝類型： | 表面貼裝 |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 其它名稱： | BU7231G-DKR BU7231G-DKR-ND BU7231GDKR |
IDT / ICS 700MHZ, 3.3V LVPECL FREQUENCY SYNTHESIZER
13
ICS8430B-71 REV A NOVEMBER 20, 2006
ICS8430B-71
700MHZ, CRYSTAL INTERFACE/LVCMOS-TO-3.3V LVPECL FREQUENCY SYNTHESIZER
POWER CONSIDERATIONS
This section provides information on power dissipation and junction temperature for the ICS8430B-71.
Equations and example calculations are also provided.
1. Power Dissipation.
The total power dissipation for the ICS8430B-71 is the sum of the core power plus the power dissipated in the load(s).
The following is the power dissipation for V
CC
= 3.3V + 5% = 3.465V, which gives worst case results.
NOTE: Please refer to Section 3 for details on calculating power dissipated in the load.
Power (core)
MAX
= V
CC_MAX
* I
EE_MAX
= 3.465V * 140mA = 485mW
Power (outputs)
MAX
= 30mW/Loaded Output pair
If all outputs are loaded, the total power is 2 * 30mW = 60mW
Total Power
_MAX
(3.465V, with all outputs switching) = 485mW + 60mW = 545mW
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 HiPerClockS
TM devices is 125°C.
The equation for Tj is as follows: Tj =
θ
JA * Pd_total + TA
Tj = Junction Temperature
θ
JA = Junction-to-Ambient Thermal Resistance
Pd_total = Total Device Power Dissipation (example calculation is in section 1 above)
T
A = Ambient Temperature
In order to calculate junction temperature, the appropriate junction-to-ambient thermal resistance
θ
JA must be used. Assuming a
moderate air flow of 200 linear feet per minute and a multi-layer board, the appropriate value is 42.1°C/W per Table 8 below.
Therefore, Tj for an ambient temperature of 70°C with all outputs switching is:
70°C + 0.545
* 42.1°C/W = 93°C. This is well below the limit of 125°C.
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).
θθθθθ
JA
by Velocity (Linear Feet per Minute)
0
200
500
Single-Layer PCB, JEDEC Standard Test Boards
67.8°C/W
55.9°C/W
50.1°C/W
Multi-Layer PCB, JEDEC Standard Test Boards
47.9°C/W
42.1°C/W
39.4°C/W
NOTE: Most modern PCB designs use multi-layered boards. The data in the second row pertains to most designs.
TABLE 8. THERMAL RESISTANCE
θθθθθ
JA
FOR
32-PIN LQFP, FORCED CONVECTION
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