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| 型号： | ICM7216DIPI |
| 厂商： | Intersil |
| 文件页数： | 10/18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
input (EX DP INPUT). Digit 8 should not be used since it will
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.
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.
a
RESET Input
f
g
b
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
e
d
c
DP
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
FIGURE 9. SEGMENT IDENTIFICATION AND DISPLAY FONT
Overflow will be indicated on the decimal point output of
digit 8. A separate LED overflow indicator can be connected
as follows:
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.
DEVICE
ICM7216B/D
CATHODE
D8
ANODE
Decimal Point
TABLE 3. DECIMAL POINT POSITIONS
FREQUENCY
TIME
UNIT
OSCILLATOR
RANGE
0.01s/1 Cycle
0.1s/10 Cycle
1s/100 Cycle
10s/1K Cycle
FREQUENCY
D2
D3
D4
D5
PERIOD
D2
D3
D4
D5
RATIO
D1
D2
D3
D4
INTERVAL
D2
D3
D4
D5
COUNTER
D1
D1
D1
D1
FREQUENCY
D2
D3
D4
D5
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).
10
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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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