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PDF ICM7242 Data sheet ( Hoja de datos )
| Número de pieza | ICM7242 | |
| Descripción | Long Range Fixed Timer | |
| Fabricantes | Intersil Corporation | |
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®
Data Sheet
February 9, 2007
ICM7242
FN2866.4
Long Range Fixed Timer
The ICM7242 is a CMOS timer/counter circuit consisting of
an RC oscillator followed by an 8-bit binary counter. It will
replace the 2242 in most applications, with a significant
reduction in the number of external components.
Three outputs are provided. They are the oscillator output,
and buffered outputs from the first and eighth counters.
Ordering Information
PART
TEMP.
PKG.
PART NUMBER MARKING RANGE (°C) PACKAGE DWG. #
ICM7242IPA 7242 IPA -25 to +85 8 Ld PDIP E8.3
ICM7242IPAZ 7242 IPAZ -25 to +85 8 Ld PDIP** E8.3
(See Note)
(Pb-free)
ICM7242CBAZ* 7242 CBAZ 0 to +70 8 Ld SOIC
(Pb-free)
M8.15
ICM7242IBAZ* 7242 IBAZ -25 to +85 8 Ld SOIC
(Pb-free)
M8.15
*Add “-T” suffix for tape and reel.
**Pb-free PDIPs can be used for through hole wave solder processing
only. They are not intended for use in Reflow solder processing
applications.
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100%
matte tin plate termination finish, which are RoHS compliant and
compatible with both SnPb and Pb-free soldering operations. Intersil
Pb-free products are MSL classified at Pb-free peak reflow
temperatures that meet or exceed the Pb-free requirements of
IPC/JEDEC J STD-020
Features
• Replaces the 2242 in Most Applications
• Timing From Microseconds to Days
• Cascadable
• Monostable or Astable Operation
• Wide Supply Voltage Range . . . . . . . . . . . . . . . 2V to 16V
• Low Supply Current . . . . . . . . . . . . . . . . . . . . 115µA at 5V
• Pb-Free Plus Anneal Available (RoHS Compliant)
Pinout
ICM7242
(8 LD PDIP, SOIC)
TOP VIEW
VDD 1
÷2 OUT 2
÷128/256 OUT 3
VSS 4
8 TB I/O
7 RC
6 TRIGGER
5 RESET
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 1996, 2005, 2007. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ICM7242
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).
VDD
1
8R
1
8
C
2 72 7
ICM7242
ICM7242
3 63 6
4 54 5
f = RC/216
FIGURE 3. LOW FREQUENCY REFERENCE (OSCILLATOR)
For monostable operation the ÷28 output is connected to the
RESET terminal. A positive edge on TRIGGER initiates the
cycle (NOTE: TRIGGER overrides RESET).
VDD
OUTPUT
18
27
ICM7242
36
45
R
C
TRIGGER
S1
RESET
100kΩ
TRIGGER
TERMINAL 6
TB OUTPUT
TERMINAL 8
OUTPUT
TERMINAL 3
FIGURE 4. MONOSTABLE OPERATION
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.
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°C 0°C to 70°C
Supply Current, VDD = 5V
Pullup Resistors
TB Output
0.7mA (Max) 7mA (Max)
No Yes
÷2 Output
÷256 Output
No Yes
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
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.
TRIGGERING CAN BE
OBTAINED FROM A
PREVIOUS STAGE,
START
A LIMIT SWITCH,
O- PERATOR SWITCH, ETC.
ICM7242
WAIT
5s
ICM7242
ENABLE
10s
STOP
ENABLE
5s
ICM7242
COUNT
TO 185
ICM7240
WAIT
5s
ICM7242
START
STOP
WAIT ENABLE WAIT
5s 10s
5s
COUNT ENABLE
TO 185
5s
FIGURE 5. FLOW CHART FOR MACHINE TOOL CONTROLLER
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)
5 FN2866.4
February 9, 2007
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet ICM7242.PDF ] | |
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