ICM7242IPAZ Intersil, ICM7242IPAZ Datasheet - Page 5

• Manufacturer Part Number: ICM7242IPAZ
• Description: IC TIMER LONG RANGE FIXED 8-DIP
• Manufacturer: Intersil
• Type: Binary RC Timer/Counterr

Specifications of ICM7242IPAZ

• Count: 128/256
• Frequency: 15MHz
• Voltage - Supply: 2 V ~ 16 V
• Current - Supply: 340µA
• Operating Temperature: -25°C ~ 85°C
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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 ÷2
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.
FIGURE 3. LOW FREQUENCY REFERENCE (OSCILLATOR)
TB OUTPUT
TRIGGER
OUTPUT
OUTPUT
V
DD
1
2
3
4
FIGURE 4. MONOSTABLE OPERATION
ICM7242
V
DD
1
2
3
4
8
7
6
5
ICM7242
R
5
C
f = RC/2
8
100kΩ
output is connected to the
1
2
3
4
8
7
6
5
16
ICM7242
S
1
RESET
TERMINAL 6
TERMINAL 8
TERMINAL 3
TRIGGER
R
8
7
6
5
C
ICM7242
ICM7242
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)
FIGURE 5. FLOW CHART FOR MACHINE TOOL CONTROLLER
TRIGGERING CAN BE
OBTAINED FROM A
PREVIOUS STAGE,
A LIMIT SWITCH,
OPERATOR SWITCH, ETC.
-
Operating Voltage
Operating Temperature Range
Supply Current, V
Pullup Resistors
Toggle Rate
Resistor to Inhibit Oscillator
Resistor in Series with Reset for
Monostable Operation
Capacitor TB Terminal for HF
Operation
START
TB Output
÷
÷
2 Output
256 Output
TABLE 1. COMPARING THE ICM7242 WITH THE 2242
CHARACTERISTICS
WAIT
5s
STOP
ENABLE
DD
10s
= 5V
ENABLE
ICM7242
START
WAIT
5s
5s
-25°C to 85°C
0.7mA (Max)
COUNT
2V to 16V
TO 185
ICM7242
3.0MHz
ICM7242
ICM7240
No
No
No
No
No
No
COUNT
TO 185
WAIT
5s
ENABLE
5s
0°C to 70°C
Sometimes
7mA (Max)
4V to 15V
February 9, 2007
STOP
ICM7242
ENABLE
ICM7242
0.5MHz
WAIT
2242
10s
Yes
Yes
Yes
Yes
Yes
5s
FN2866.4