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參數(shù)資料
| 型號(hào)： | ICM7216B |
| 廠商： | Intersil Corporation |
| 元件分類： | 通用總線功能 |
| 英文描述： | 8-Digit, Multi-Function, Frequency Counters/Timers |
| 中文描述： | 8位數(shù)字，多功能，頻率計(jì)數(shù)器/定時(shí)器 |
| 文件頁(yè)數(shù)： | 10/18頁(yè) |
| 文件大?。?/td> | 642K |
| 代理商： | ICM7216B |
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10
override the overflow output. Leading zero blanking is
effective for the digits to the left of selected decimal point.
Hold Input
Except in the
unit counter mode
, when the HOLD input is
at VDD, any measurement in progress (before STORE goes
low) is stopped, the main counter is reset and the chip is
held ready to initiate a new measurement as soon as HOLD
goes low. The latches which hold the main counter data are
not updated, so the last complete measurement is displayed.
In
unit counter
mode when HOLD input is at VDD, the
counter is not stopped or reset, but the display is frozen at
that instantaneous value. When HOLD goes low the count
continues from the new value in the new counter.
RESET Input
The RESET input resets the main counter, stops any
measurement in progress, and enables the main counter
latches, resulting in an all zero output. A capacitor to ground
will prevent any hang-ups on power-up.
MEASUREMENT IN PROGRESS
This output is provided in lCM7216D. It stays low during
measurements and goes high for intervals between
measurements. It is provided for system interfacing and can
drive a low power Schottky TTL or one ECL load if the ECL
device is powered from the same supply as lCM7216D.
Decimal Point Position
Table 3 shows the decimal point position for different modes
of lCM7216 operation. Note that the digit 1 is the least
significant digit. Table 3 is for 10MHz timebase frequency.
Overflow Indication
When overflow happens in any measurement it will be
indicated on the decimal point of the digit 8. A separate LED
indicator can be used. Figure 9 shows how to connect this
indicator.
Overflow will be indicated on the decimal point output of
digit 8. A separate LED overflow indicator can be connected
as follows:
Time Interval Measurement
When in the
time interval
mode and measuring a single
event, the lCM7216B must first be “primed” prior to measuring
the event of interest. This is done by first generating a
negative going edge on Channel A followed by a negative
going edge on Channel B to start the “measurement interval”.
The inputs are then primed ready for the measurement.
Positive going edges on A and B, before or after the priming,
will be needed to restore the original condition.
Priming can be easily accomplished using the circuit in
Figure 10 (next page).
DEVICE
CATHODE
ANODE
ICM7216B/D
D8
Decimal Point
a
b
c
d
f
g
e
DP
FIGURE 9. SEGMENT IDENTIFICATION AND DISPLAY FONT
TABLE 3. DECIMAL POINT POSITIONS
RANGE
FREQUENCY
PERIOD
FREQUENCY
RATIO
TIME
INTERVAL
UNIT
COUNTER
OSCILLATOR
FREQUENCY
0.01s/1 Cycle
D2
D2
D1
D2
D1
D2
0.1s/10 Cycle
D3
D3
D2
D3
D1
D3
1s/100 Cycle
D4
D4
D3
D4
D1
D4
10s/1K Cycle
D5
D5
D4
D5
D1
D5
ICM7216B
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ICM7216B_04 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:8-Digit, Multi-Function, Frequency Counters/Timers |
| ICM7216BIJI | 制造商:HAR 功能描述:7216 HAR'86 13/TUBE CERAMIC |
| ICM7216BIPI | 制造商:Rochester Electronics LLC 功能描述:DISPLAY 8 DIGIT FREQ COUNTER 28PDIP IND - Bulk 制造商:Intersil Corporation 功能描述: |
| ICM7216BIPI WAF | 制造商:Intersil Corporation 功能描述: |
| ICM7216BLPL | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:8-Digit, Multi-Function, Frequency Counters/Timers |
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