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參數(shù)資料
| 型號： | ICM7226BlPL |
| 廠商： | Intersil Corporation |
| 元件分類： | 通用總線功能 |
| 英文描述： | 8-Digit, Multi-Function, Frequency Counter/Timer |
| 中文描述： | 8位數(shù)字，多功能，頻率計(jì)數(shù)器/計(jì)時(shí)器 |
| 文件頁數(shù)： | 7/19頁 |
| 文件大?。?/td> | 173K |
| 代理商： | ICM7226BLPL |
9-21
Description
INPUTS A and B
The signal to be measured is applied to INPUT A in
frequency period, unit counter, frequency ratio and time
interval modes. The other input signal to be measured is
applied to INPUT B in frequency ratio and time interval. f
A
should be higher than f
B
during frequency ratio.
Both inputs are digital inputs with a typical switching thresh-
old of 2.0V at V
DD
= 5.0V and input impedance of 250k
.
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
Note that the amplitude of the input should not exceed the
device supply (above the V
DD
and below the V
SS
) 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 appro-
priate 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 are
active high for the common anode lCM7226A and active low
for the common cathode lCM7226B.
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.
FIGURE 8. f
A
(MAX), f
B
(MAX) AS A FUNCTION OF SUPPLY
Typical Performance Curves
(Continued)
f
A
(MAX) FREQUENCY UNIT COUNTER,
FREQUENCY RATIO MODES
f
A
(MAX) f
B
(MAX) PERIOD
TIME INTERVAL MODES
T
A
= 25
o
C
V
DD
-V
SS
(V)
F
20
15
10
5
0
3
4
5
6
INPUT A
4.5V
0.5V
50ns MIN
t
r
= t
f
= 10ns
COUNTED
TRANSITIONS
50ns MIN
FIGURE 9. WAVEFORM FOR GUARANTEED MINIMUM f
A
(MAX)
FUNCTION = FREQUENCY, FREQUENCY RATIO,
UNIT COUNTER
INPUT A OR
INPUT B
4.5V
0.5V
MEASURED
INTERVAL
250ns
MIN
t
r
= t
f
= 10s
250ns
MIN
FIGURE 10. WAVEFORM FOR GUARANTEED MINIMUM f
B
(MAX)
AND f
A
(MAX) FOR FUNCTION = PERIOD AND
TIME INTERVAL
ICM7226A, ICM7226B
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