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| 型号： | ICM7216DIPI |
| 厂商： | Intersil |
| 文件页数： | 7/18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
Typical Performance Curves
(Continued)
200
V DD = 5V
-20 o C
200
T A = 25 o C
V DD = 5.5V
25 o C
150
100
50
85 o C
50
100
50
V DD = 5V
V DD = 4.5V
0
0
1
2
3
0
0
1
2
3
V OUT (V)
FIGURE 4. TYPICAL I DIGIT vs V OUT
V OUT (V)
FIGURE 5. TYPICAL I DIGIT vs V OUT
Description
.
TABLE 1. MULTIPLEXED INPUT FUNCTIONS
INPUTS A and B
FUNCTION
DIGIT
INPUTS A and B are digital inputs with a typical switching
threshold of 2V at V DD = 5V. For optimum performance the
peak-to-peak input signal should be at least 50% of the
supply voltage and centered about the switching voltage.
When these inputs are being driven from TTL logic, it is
desirable to use a pullup resistor. The circuit counts high to
low transitions at both inputs. (INPUT B is available only on
lCM7216B).
Note that the amplitude of the input should not exceed the
device supply (above the VDD and below the VSS) by more
than 0.3V, otherwise the device may be damaged.
Multiplexed Inputs
The FUNCTION, RANGE, CONTROL and EXTERNAL
DECIMAL POINT inputs are time multiplexed to select the
function desired. This is achieved by connecting the
appropriate Digit driver output to the inputs. The function,
range and control inputs must be stable during the last half
of each digit output, (typically 125 μ s). The multiplexed inputs
FUNCTION INPUT
(Pin 3, lCM7216B Only)
RANGE INPUT, Pin 14
CONTROL INPUT, Pin 1
Frequency
Period
Frequency Ratio
Time Interval
Unit Counter
Oscillator Frequency
0.01s/1 Cycle
0.1s/10 Cycles
1s/100 Cycles
10s/1K Cycles
Display Off
Display Test
1MHz Select
External Oscillator Enable
External Decimal Point
Enable
D1
D8
D2
D5
D4
D3
D1
D2
D3
D4
D4 and
Hold
D8
D2
D1
D3
are active low for the common cathode lCM7216B and
lCM7216D.
Noise on the multiplex inputs can cause improper operation.
This is particularly true when the unit counter mode of
operation is selected, since changes in voltage on the digit
drivers can be capacitively coupled through the LED diodes
to the multiplex inputs. For maximum noise immunity, a
10k ? resistor should be placed in series with the multiplexed
inputs as shown in the application circuits.
Table 1 shows the functions selected by each digit for
these inputs.
7
External DP INPUT
(Pin 13, ICM7216D Only)
Decimal point is output for same digit
that is connected to this input.
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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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