參數(shù)資料
型號(hào): SY100E016JY TR
廠商: Micrel Inc
文件頁數(shù): 8/10頁
文件大?。?/td> 0K
描述: IC UPCOUNTER 8BIT SYNC 28-PLCC
標(biāo)準(zhǔn)包裝: 750
系列: 100E
邏輯類型: 二進(jìn)制計(jì)數(shù)器
方向:
元件數(shù): 1
每個(gè)元件的位元數(shù): 8
復(fù)位: 異步
計(jì)時(shí): 同步
計(jì)數(shù)速率: 900MHz
觸發(fā)器類型: 正邊沿
電源電壓: 4.2 V ~ 5.5 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 28-LCC(J 形引線)
供應(yīng)商設(shè)備封裝: 28-PLCC
包裝: 帶卷 (TR)
其它名稱: SY100E016JYTR
SY100E016JYTR-ND
7
SY10E016
SY100E016
Micrel, Inc.
M9999-032006
hbwhelp@micrel.com or (408) 955-1690
Programmable Divider
The E016 has been designed with a control pin which
makes it ideal for use as an 8-bit programmable divider. The
TCLD pin (load on terminal count), when asserted, reloads the
data present at the parallel input pin (Pn's) upon reaching
terminal count (an all 1s state on the outputs). Because this
feedback is built internal to the chip, the programmable
division operation will run at very nearly the same frequency
as the maximum counting frequency of the device. Figure 2
below illustrates the input conditions necessary for utilizing
the E016 as a programmable divider set up to divide by 113.
To determine what value to load into the device to accomplish
the desired division, the designer simply subtracts the binary
equivalent of the desired divide ratio for the binary value for
256. As an example for a divide ration of 113:
PN's = 256 – 113 = 8F16 = 1000 1111
where
P0 = LSB and P7 = MSB
Forcing this input condition, as per the set-up in Figure 2, will
result in the waveforms of Figure 3. Note that the TC output
HLL
H
LH
H
P7
P6
P5
P4
P3
P2
P1
P0
PE
CE
TCLD
CLK
Q7
Q6
Q5
Q4
Q3
Q2
Q1
Q0
TC
H
L
H
Figure 2. Mod 2 to 256 Programmable Divider
Figure 3. Divide by 113 E016 Programmable Divider Waveforms
CLOCK
PE
TC
LOAD
1001 0000
1001 0001
1111 1100
1111 1101
1111 1110
1111 1111
LOAD
Divide by 113
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