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参数资料
| 型号： | ICM7216DIPI |
| 厂商： | Intersil |
| 文件页数： | 8/18页 |
| 文件大小： | 0K |
| 描述： | IC COUNTER/TIMER FREQ 8DIG 28DIP |
| 标准包装： | 78 |
| 系列： | * |
| 其它名称： | 7216DIPI NT5007 |
ICM7216B, ICM7216D
COUNTED
TRANSITIONS
50ns MIN
Function Input
The six functions that can be selected are: Frequency,
Period, Time Interval, Unit Counter, Frequency Ratio and
Oscillator Frequency. This input is available on the
INPUT A
4.5V
lCM7216B only.
0.5V
50ns MIN
tr = tf = 10ns
The implementation of different functions is done by routing
the different signals to two counters, called “Main Counter”
FIGURE 6. WAVEFORM FOR GUARANTEED MINIMUM
f A (MAX) FUNCTION = FREQUENCY,
FREQUENCY RATIO, UNIT COUNTER
9.
MEASURED
INTERVAL
250ns
MIN
INPUT A OR 4.5V
and “Reference Counter”. A simplified block diagram of the
device for functions realization is shown in Figure 8. Table 2
shows which signals will be routed to each counter in
different cases. The output of the Main Counter is the
information which goes to the display. The Reference
Counter divides its input by 1, 10, 100 and 1000. One of
these outputs will be selected through the range selector
and drive the enable input of the Main Counter. This means
that the Reference Counter, along with its associated blocks,
directs the Main Counter to begin counting and determines
INPUT B 0.5V
250ns
MIN
tr = tf = 10s
the length of the counting period. Note that Figure 8 does not
show the complete functional diagram (See the Functional
Block Diagram). After the end of each counting period, the
FIGURE 7. WAVEFORM FOR GUARANTEED MINIMUM
f B (MAX) AND f A (MAX) FOR FUNCTION = PERIOD
AND TIME INTERVAL
INTERNAL CONTROL
100Hz
output of the Main Counter will be latched and displayed,
then the counter will be reset and a new measurement cycle
will begin. Any change in the FUNCTION INPUT will stop the
present measurement without updating the display and then
initiate a new measurement. This prevents an erroneous first
reading after the FUNCTION INPUT is changed. In all cases,
the 1-0 transitions are counted or timed.
INTERNAL CONTROL
INPUT A
INPUT B
INPUT
SELECTOR
CLOCK
REFERENCE COUNTER
÷ 1
÷ 10
÷ 100 ÷ 1000
INTERNAL OR
EXTERNAL
INTERNAL CONTROL
INTERNAL CONTROL
RANGE SELECTOR
ENABLE
OSCILLATOR
INPUT A
INPUT
SELECTOR
CLOCK
MAIN COUNTER
FIGURE 8. SIMPLIFIED BLOCK DIAGRAM OF FUNCTIONS IMPLEMENTATION
TABLE 2. 7216B INPUT ROUTING
TABLE 2. 7216B INPUT ROUTING
FUNCTION
Frequency (f A )
Period (t A )
Ratio (f A /f B )
MAIN
COUNTER
Input A
Oscillator
Input A
REFERENCE COUNTER
100Hz (Oscillator ∏÷ 10 5 or
10 4 )
Input A
Input B
FUNCTION
Time Interval
(A → B)
Unit Counter
(Count A)
Osc. Freq.
(f OSC )
MAIN
COUNTER
Oscillator
Input A
Oscillator
REFERENCE COUNTER
Input A
Input B
Not Applicable
100Hz (Oscillator ∏÷ 10 5 or
10 4 )
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ICM7216DIPI WAF | 制造商:Intersil Corporation 功能描述: |
| ICM7216DLPL | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:8-Digit, Multi-Function, Frequency Counters/Timers |
| ICM7217 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:4 Digit (LED) Presettable Up/Down Counter |
| ICM7217_01 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:4-Digit LED Display, Programmable Up/Down Counter |
| ICM7217A | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Analog IC |
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