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參數(shù)資料
| 型號： | MC100E016FNR2G |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 12/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC COUNTER 8BIT SYNC ECL 28PLCC |
| 產(chǎn)品變化通告： | Dimensional change 21/Oct/2008 |
| 標準包裝： | 500 |
| 系列： | 100E |
| 邏輯類型： | 二進制計數(shù)器 |
| 方向： | 上 |
| 元件數(shù)： | 1 |
| 每個元件的位元數(shù)： | 8 |
| 復位： | 異步 |
| 計時： | 同步 |
| 計數(shù)速率： | 900MHz |
| 觸發(fā)器類型： | 正邊沿 |
| 電源電壓： | 4.2 V ~ 5.7 V |
| 工作溫度： | 0°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-LCC（J 形引線） |
| 供應商設備封裝： | 28-PLCC（11.51x11.51） |
| 包裝： | 帶卷 (TR) |
MC10E016, MC100E016
http://onsemi.com
9
APPLICATIONS INFORMATION (continued)
E016
MSB
CLK
TC
PE
CE
E016
CLK
TC
PE
CE
E016
CLK
TC
PE
CE
EL01
CLOCK
Q0 > Q7
PO > P7
Q0 > Q7
PO > P7
Q0 > Q7
PO > P7
Q0 > Q7
PO > P7
LO
E016
LSB
CLK
TC
PE
CE
Figure 6. 32Bit Cascaded E016 Programmable Divider
OUT
Figure 6 shows a typical block diagram of a 32bit divider
chain. Once again to maximize the frequency of operation
EL01 OR gates were used. For lower frequency applications
a slower OR gate could replace the EL01. Note that for a
16bit divider the OR function feeding the PE (program
enable) input CANNOT be replaced by a wire OR tie as the
TC output of the least significant E016 must also feed the CE
input of the most significant E016. If the two TC outputs
were OR tied the cascaded count operation would not
operate properly. Because in the cascaded form the PE
feedback is external and requires external gating, the
maximum frequency of operation will be significantly less
than the same operation in a single device.
Maximizing E016 Count Frequency
The E016 device produces 9 fast transitioning
singleended outputs, thus VCC noise can become
significant in situations where all of the outputs switch
simultaneously in the same direction. This VCC noise can
negatively impact the maximum frequency of operation of
the device. Since the device does not need to have the Q
outputs terminated to count properly, it is recommended that
if the outputs are not going to be used in the rest of the system
they should be left unterminated. In addition, if only a subset
of the Q outputs are used in the system only those outputs
should be terminated. Not terminating the unused outputs
will not only cut down the VCC noise generated but will also
save in total system power dissipation. Following these
guidelines will allow designers to either be more aggressive
in their designs or provide them with an extra margin to the
published data book specifications.
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