参数资料
| 型号： | ICM7242IBAZ |
| 厂商： | Intersil |
| 文件页数： | 6/10页 |
| 文件大小： | 0K |
| 描述： | IC OSC BINARY CTC 13MHZ 8-SOIC |
| 标准包装： | 980 |
| 类型： | 计数器/计时器电路（CTC），二进制 |
| 计数： | 128/256 |
| 频率： | 0.1Hz ~ 13MHz |
| 电源电压： | 2 V ~ 16 V |
| 电流 - 电源： | 340µA |
| 工作温度： | -25°C ~ 85°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 8-SOIC |
| 安装类型： | 表面贴装 |
5
FN2866.4
February 9, 2007
To use the 8-bit counter without the timebase, Terminal 7
(RC) should be connected to ground and the outputs taken
from Terminals 2 and 3.
The ICM7242 may be used for a very low frequency square
wave reference. For this application the timing components
are more convenient than those that would be required by a
555 timer. For very low frequencies, devices may be
cascaded (see Figure 3).
For monostable operation the
÷28 output is connected to the
RESET terminal. A positive edge on TRIGGER initiates the
cycle (NOTE: TRIGGER overrides RESET).
The ICM7242 is superior in all respects to the 2242 except
for initial accuracy and oscillator stability. This is primarily
due to the fact that high value p-resistors have been used on
the ICM7242 to provide the comparator timing points.
By selection of R and C, a wide variety of sequence timing
can be realized. A typical flow chart for a machine tool
controller could be as shown in Figure 5.
By cascading devices, use of low cost CMOS AND/OR gates
and appropriate RC delays between stages, numerous
sequential control variations can be obtained. Typical
applications include injection molding machine controllers,
phonograph record production machines, automatic
sequencers (no metal contacts or moving parts), milling
machine controllers, process timers, automatic lubrication
systems, etc.
Sequence Timing
Process Control
Machine Automation
Electro-Pneumatic Drivers
Multi Operation (Serial or Parallel Controlling)
1
2
3
4
8
7
6
5
VDD
C
R
1
2
3
4
8
7
6
5
ICM7242
f = RC/216
FIGURE 3. LOW FREQUENCY REFERENCE (OSCILLATOR)
OUTPUT
TERMINAL 3
TB OUTPUT
TRIGGER
TERMINAL 8
TERMINAL 6
1
2
3
4
8
7
6
5
VDD
C
R
ICM7242
OUTPUT
100k
Ω
TRIGGER
RESET
S1
FIGURE 4. MONOSTABLE OPERATION
TABLE 1. COMPARING THE ICM7242 WITH THE 2242
CHARACTERISTICS
ICM7242
2242
Operating Voltage
2V to 16V
4V to 15V
Operating Temperature Range
-25°C to 85°C0°C to 70°C
Supply Current, VDD = 5V
0.7mA (Max)
7mA (Max)
Pullup Resistors
TB Output
No
Yes
÷2 Output
No
Yes
÷256 Output
No
Yes
Toggle Rate
3.0MHz
0.5MHz
Resistor to Inhibit Oscillator
No
Yes
Resistor in Series with Reset for
Monostable Operation
No
Yes
Capacitor TB Terminal for HF
Operation
No
Sometimes
TRIGGERING CAN BE
OBTAINED FROM A
PREVIOUS STAGE,
A LIMIT SWITCH,
OPERATOR SWITCH, ETC.
ENABLE
10s
WAIT
5s
START
ICM7242
WAIT
5s
COUNT
TO 185
ENABLE
5s
ICM7242
ICM7240
ICM7242
STOP
START
STOP
WAIT
5s
WAIT
5s
ENABLE
5s
COUNT
TO 185
ENABLE
10s
FIGURE 5. FLOW CHART FOR MACHINE TOOL CONTROLLER
-
ICM7242
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| ICM7242IBAZ-T | 功能描述:计数器 IC LONG RNG FIXED TIMR IND RoHS:否 制造商:NXP Semiconductors 计数器类型:Binary Counters 逻辑系列:74LV 位数:10 计数法: 计数顺序: 工作电源电压:1 V to 5.5 V 工作温度范围:- 40 C to + 125 C 封装 / 箱体:SOT-109 封装:Reel |
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