DM7490AN
DM7490AN Datasheet
DM7490A Decade and Binary Counter
| Part | Datasheet |
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DM7490AN |
DM7490AN (pdf) |
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| DM7490A Decade and Binary Counter DM7490A Decade and Binary Counter The DM7490A monolithic counter contains four masterslave flip-flops and additional gating to provide a divide-bytwo counter and a three-stage binary counter for which the count cycle length is divide-by-five. The counter has a gated zero reset and also has gated setto-nine inputs for use in BCD nine’s complement applications. To use the maximum count length decade or four-bit binary , the B input is connected to the QA output. The input count pulses are applied to input A and the outputs are as described in the appropriate Function Table. A symmetrical divide-by-ten count can be obtained from the counters by connecting the QD output to the A input and applying the input count to the B input which gives a divideby-ten square wave at output QA. s Typical power dissipation 145 mW s Count frequency 42 MHz Ordering Code: Order Number Package Number Package Description DM7490AN N14A 14-Lead Plastic Dual-In-Line Package PDIP , JEDEC MS-001, Wide Connection Diagram 2001 Fairchild Semiconductor Corporation DS006533 DM7490A Function Tables BCD Count Sequence Note 1 Outputs Count Logic Diagram Count 0 1 2 3 4 5 6 7 8 9 BCD Bi-Quinary 5-2 Note 2 Outputs Reset/Count Function Table R0 1 H X L X Reset Inputs R0 2 R9 1 R9 2 X L H L X L X Outputs QD QC QB QA LLLL HL LH COUNT H = HIGH Level L = LOW Level X = Don’t Care Note 1 Output QA is connected to input B for BCD count. Note 2 Output QD is connected to input A for bi-quinary count The J and K inputs shown without connection are for reference only and are functionally at a HIGH level. DM7490A Absolute Maximum Ratings Note 3 Supply Voltage Input Voltage Operating Free Air Temperature Range Storage Temperature Range 7V 5.5V 0°C to +70°C −65°C to +150°C Note 3 The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The “Recommended Operating Conditions” table will define the conditions for actual device operation. Recommended Operating Conditions Parameter Supply Voltage HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Current LOW Level Output Current |
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