ICM7217 INTERSIL | Alldatasheet
Document overview
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Technical content
Features
- Four Decade, Presettable Up-Down Counter with Parallel Zero Detect
- Settable Register with Contents Continuously Compared to Counter
- Directly Drives Multiplexed 7 Segment Common Anode or Common Cathode LED Displays
- On-Board Multiplex Scan Oscillator
- Schmitt Trigger On Count Input
- TTL Compatible BCD I/O Port, Carry/Borrow, Equal, and Zero Outputs
- Display Blank Control for Lower Power Operation; Quiescent Power Dissipation <5mW
- All Terminals Fully Protected Against Static Discharge
- Single 5V Supply Operation
Description
The ICM7217 is a four digit, presettable up/down counter with an onboard presettable register continuously compared to the counter. The ICM7217 is intended for use in hard-wired applications where thumbwheel switches are used for loading data, and simple SPDT switches are used for chip control. This circuit provides multiplexed 7 segment LED display outputs, with common anode or common cathode configurations available. Digit and segment drivers are provided to directly drive displays of up to 0.8 inch character height (common anode) at a 25% duty cycle. The frequency of the onboard multiplex oscillator may be controlled with a single capacitor, or the oscillator may be allowed to free run. Leading zeros can be blanked. The data appearing at the 7 segment and BCD outputs is latched; the content of the counter is transferred into the latches under external control by means of the Store pin. The ICM7217 (common anode) and ICM7217A (common cathode) versions are decade counters, providing a maximum count of 9999, while the ICM7217B (common anode) and ICM7217C (common cathode) are intended for timing purposes, providing a maximum count of 5959. This circuit provides 3 main outputs; a CARRY/BORROW output, which allows for direct cascading of counters, a ZER O output, which indicates when the count is zero, and an EQ UAL output, which indicates when the count is equal to the value contained in the register. Data is multiplexed to and from the device by means of a three-state BCD I/O port. The CARRY/BORROW, EQ UAL, ZER O outputs, and the BCD port will each drive one standard TTL load. To permit operation in noisy environments and to prevent multiple triggering with slowly changing inputs, the count input is provided with a Schmitt trigger. Input frequency is guaranteed to 2MHz, although the device will typically run with f IN as high as 5MHz. Counting and comparing (EQUAL output) will typically run 750kHz maximum.
Ordering Information
TEMP. RANGE (oC) PACKAGE DISPLAY DRIVER TYPE COUNT OPTION/ MAX COUNT PKG. NO. ICM7217AIPI -25 to 85 28 Ld PDIP Common Cathode Decade/9999 E28.6 ICM7217CIPl -25 to 85 28 Ld PDIP Common Cathode Timing/5959 E28.6 ICM7217IJI -25 to 85 28 Ld CERDIP Common Anode Decade/9999 F28.6 lCM7217BlJl -25 to 85 28 Ld CERDIP Common Anode Timing/5959 F28.6 File Number 3167.1CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. http://www.intersil.com or 407-727-9207| Copyright © Intersil Corporation 1999
ICM7217 (PDIP) COMMON ANODE TOP VIEW ICM7217 (CERDIP) COMMON CATHODE TOP VIEW CARRY/BORROW ZER O EQ UAL BCD I/O 8s BCD I/O 4s BCD I/O 2s BCD I/O 1s COUNT INPUT STORE UP/DO WN LOAD REGISTER/ OFF LOAD COUNTER/ I/O OFF SCAN RESET VDD DISPLAY CONT. SEG b SEG e SEG f SEG d SEG a SEG c SEG g VSS ICM7217 ICM7217B CARRY/BORROW ZER O EQ UAL BCD I/O 8s BCD I/O 4s BCD I/O 2s BCD I/O 1s COUNT INPUT STORE UP/DO WN LOAD REGISTER/ OFF LOAD COUNTER/ I/O OFF SCAN RESET SEG d SEG f SEG c VDD SEG a SEG g VSS SEG b SEG e DISPLAY CONT. ICM7217A ICM7217C T.G. RS ZERO U/D CL CARRY T.G. LATCH MUX T.G. RS ZERO U/D CL CARRY T.G. LATCH MUX T.G. RS ZERO U/D CL CARRY T.G. LATCH MUX T.G. RS ZERO U/D CL CARRY T.G. LATCH MUX 1234 T.G. COMP. REG. 1234 123 4 123 4 T.G. COMP. REG. T.G. COMP. REG. T.G. COMP. REG. BDC I/O ZER O UP/DN COUNT VDD VSS SEGMENT DECODER SEGMENT DRIVERS (7) DIGIT DRIVERS (4) A D4 D3 D2 D1 DISPLAY BLANK + OFF GB C D E F MUX. OSCILLATOR MUX. I/O AND DISPLAY CONTROL LOGIC 4 4DIGIT MUX SCAN DISPLAY LOAD LOAD RESET STORE EQ UALCARRY/BARROW CONTROL REGISTER COUNTER L.R. L.C. RESET BCD I/O INPUTS COM. ANODE: PULL DOWN COM. CATHODE: PULL UP VDD VDD VDD VSS VDD VSS VDD VSS ICM7217
Absolute Maximum Ratings Thermal Information (Note 1) Operating Conditions Thermal Resistance (Typical, Note 2)θJA (oC/W) θJC (oC/W) Maximum Junction Temperature oC CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. NOTES: 1. Due to the SCR structure inherent in the CMOS process used to fabricate these devices, connecting any terminal to a voltage greater than VDD or less than VSS may cause destructive device latchup. For this reason it is recommended that the power supply to the device be established before any inputs are applied and that in multiple systems the supply to the ICM7217 be turned on first. 2. θJA is measured with the component mounted on an evaluation PC board in free air. Electrical SpecificationsVDD = 5V, VSS = 0V, TA = 25oC, Display Diode Drop 1 .7V, Unless Otherwise Specified PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Supply Current (Lowest Power Mode), IDD (7217) Display Off, LC, DC, UP/DN, ST, RS, BCD I/O Floating or at VDD (Note 1) - 350 500 µA Supply Current, OPERATING, IOP Common Anode, Display On, all “8’s” 140 200 - mA Supply Current, OPERATING, IOP Common Cathode, Display On, all “8’s” 50 100 - mA VSUPPL Y, VDD 4.5 5 5.5 V Digit Driver Output Current, IDIG Common Anode, VOUT = VDD - 2.0V 140 200 - mA PEAK SEGment Driver Output Current, ISEG Common Anode, VOUT = +1.5V 20 35 - mA PEAK Digit Driver, Output Current, IDIG Common Cathode, VOUT = +1.0V -50 -75 - mA PEAK SEGment Driver Output Current, ISEG Common Cathode VOUT = VDD - 2V -9 -12.5 - mA PEAK ST, RS, UP/DN Input Pullup Current, IP VIN = VDD - 2V (Note 1) 5 25 - µA
3 Level Input Impendance, ZIN 40 - 350 k Ω
BCD I/O Input, High Voltage VBIH ICM7217 Common Anode (Note 2) 1.5 - - V ICM7217 Common Cathode (Note 2) 4.40 - - V BCD I/O Input, Low Voltage VBIL ICM7217 Common Anode (Note 2) - - 0.60 V ICM7217 Common Cathode (Note 2) - - 3.2V V BCD I/O Input, Pullup Current IBPU ICM7217 Common Cathode VIN = VDD - 2V (Note 2) 52 5- µA BCD I/O Input Pulldown Current, IBPD ICM7217 Common Anode V IN = +2V (Note 2) 5 25 - µA BCD I/O,ZER O, EQ UAL Outputs Output High Voltage, VOH IOH = -100µA 3.5 - - V BCD I/O, CARRY/BORROW ZER O, EQ UAL Outputs Output Low Voltage, VOL IOL = 1.6mA - - 0.4 V Count Input Frequency, fIN -20oC to 70oC - 5 - MHz Guaranteed 0 - 2 MHz Count Input Threshold, VTH (Note 3) - 2 - V Count Input Hysteresis, VHYS (Note 3) - 0.5 - V Count Input LO, VCIL - - 0.40 V Count Input HI, VCIH 3.5 - - V Display Scan Oscillator Frequency, f DS Free-running (SCAN Terminal Open Circuit) - 2.5 10 kHz ICM7217
- In the ICM7217 the UP/DO WN, STORE, RESET and the BCD I/O as inputs have pullup or pulldown devices which consume power when
connected to the opposite supply. Under these conditions, with the display off, the device will consume typically 750µA.
- These voltages are adjusted to allow the use of thumbwheel switches for the ICM7217. Note that a high level is taken as an input logic
zero for ICM7217 common-cathode versions.
- Parameters not tested (Guaranteed by Design).
FIGURE 1. MULTIPLEX TIMING
the display digit multiplex timing. time the external signal is at a positive level (see Figure 1). oscillator at less than 200Hz may cause display flickering. the diodes may be any inexpensive device such as lN914. ing reset and load counter operations. tents of the counter into the latches. four BCD I/O lines when used as inputs. to LSD by the display multiplex. tiplexed into the register without disturbing the counter. both register and counter will be loaded. trailing edge of the digit output. biased inputs and their respective operations. true, as are the BCD outputs. TABLE 1. ICM7217 MULTIPLEXED RATE CONTROL
mon cathode displays, and the BCD inputs are low true. the device. See Figure 14 and Figure 17. in the Digit lines to avoid loading problems. 1.6ms typical (5ms maximum) after LC or LR are released. relating to the preceding one. transitioning from 5 to 6 or 6 to 5. RESET input is shown on Figure 15. FIGURE 14. LCD DISPLAY INTERFACE (WITH THUMBWHEEL SWITCHES)
28 SEGMENTS
Applications
ICM7217 has three inputs with 3-level logic states; High, Low and Disconnected. These inputs are: LOAD REGISTER/OFF , LOAD COUNTER/ I/O OFF and DISPLAY CONT. The circuits illustrated on Figure 11 can be used to drive these inputs in different applications. Fixed Decimal Point In the common anode versions, a fixed decimal point may be activated by connecting the DP segment lead from the appro- priate digit (with separate digit displays) through a 39Ω series resistor to Ground. With common cathode devices, the DP segment lead should be connected through a 75Ω series resistor to V DD . To force the device to display leading zeroes after a fixed decimal point, use a bipolar transistor and base resistor in a configuration like that shown in Figure 12 with the resistor connected to the digit output driving the DP for left hand DP displays, and to the next least significant digit output for right hand DP display. Driving Larger Displays For displays requiring more current than the ICM7217 can provide, the circuits of Figure 13 can be used. LCD Display Interface The low-power operation of the ICM7217 makes an LCD interface desirable. The Intersil ICM7211 4-digit, BCD-to-LCD display driver easily interfaces to the ICM7217 as shown in Figure 14. Total system power consumption is less than 5mW. to ground to slow down the BCD lines. isolate the switches during BCD output. counter/display system available. while the negative waveform is given by two = 0.693 RBC. multivibrator and reset time delay. EQ UAL and ZER O outputs are used to control the recorder. the recorder on rewind, leaving the leader on the reel. switch-closure inputs in other applications. switch if the BCD outputs are to be used. zero blanking on the low order counter.
signals. In this configuration, the display reads hertz directly. gating, and multiply the rotational frequency by 600. TABLE 2. CONTROL INPUT DEFINITIONS ICM7217
12 Unconnected
11 Unconnected
20 Common Cathode
FIGURE 17. THUMBWHEEL SWITCH/DIODE CONNECTIONS FIGURE 18. UNIT COUNTER
7 SEGMENTS
FIGURE 19. INEXPENSIVE FREQUENCY COUNTER FIGURE 20. TAPE RECORDER POSITION INDICATOR
7 VDD
4 DIGITS
99994 DIGIT
FIGURE 21. PRECISION TIMER
FIGURE 22. 8-DIGIT UP/DOWN COUNTER
4 DIGITS 7 SEGMENTS
FIGURE 23. PRECISION FREQUENCY COUNTER (MHz MAXIMUM) FIGURE 24. AUTO-TARE SYSTEM FOR A/D CONVERTER
4 DIGIT COMMON ANODE
All Intersil semiconductor products are manufactured, assembled and tested underISO9000 quality systems certification. Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see web sitehttp://www.intersil.com Sales Office Headquarters NORTH AMERICA Intersil Corporation P. O. Box 883, Mail Stop 53-204 Melbourne, FL 32902 TEL: (407) 724-7000 FAX: (407) 724-7240 EUROPE Intersil SA Mercure Center 100, Rue de la Fusee
1130 Brussels, Belgium
TEL: (32) 2.724.2111 ASIA Intersil (Taiwan) Ltd. Taiwan Limited 7F-6, No. 101 Fu Hsing North Road Taipei, Taiwan Republic of China TEL: (886) 2 2716 9310 FAX: (886) 2 2715 3029 ICM7217