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HEF4518B MSI
General description
T he HEF4518B is a dual 4-bit internally synchronous BCD counter. The counter has an active HIGH clock input (CP0 ) and an active LOW clock input (CP1 ), buffered outputs from all four bit positions (O0 to O3 ) and an active HIGH overriding asynchronous master reset input (MR). The counter advances on either the LOW to HIGH transition of the CP0 input if CP1 is HIGH or the HIGH to LOW transition of the CP1 input if CP0 is LOW. Either CP0 or CP1 may be used as the clock input to the counter and the other clock input may be used as a clock enable input. A HIGH on MR resets the counter (O0 to O3 = LOW) independent of CP0CP1 .
Schmitt-trigger action in the clock input makes the circuit highly tolerant to slower clock rise and fall times.
Products/packages
| Type number | North American Type number | Ordering code (12NC) | Product status | Package | Packing | Marking | Chemical content | Leadfree conversion date |
|---|---|---|---|---|---|---|---|---|
| HEF4518BP | HEF4518BPN | 9332 776 60652 | Volume production | SOT38-4
(DIP16) | Bulk Pack, CECC | Standard Marking | HEF4518BP
| Always Pb-free |
| HEF4518BT | HEF4518BTD | 9333 732 30652 | Volume production | SOT109-1
(SO16) | Bulk Pack, CECC | Standard Marking | HEF4518BT
| week 6, 2004 |
| HEF4518BT | HEF4518BTD-T | 9333 732 30653 | Volume production | SOT109-1
(SO16) | Reel Pack, SMD, 13", CECC | Standard Marking | HEF4518BT
| week 6, 2004 |
Pricing/ordering/availability
| Type number | Ordering code(12NC) | Indicative price/unit($) | Region | Distributor | In stock | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|
| HEF4518BP | 9332 776 60652 | 0.2600 | NA | ARROW ELECTRONICS | 255 | 10/3/2008 | Buy online | Order samples |
| NA | FUTURE ELECTRONICS | 157 | 10/3/2008 | Buy online | ||||
| HEF4518BT | 9333 732 30652 | 0.2600 | Order samples | |||||
| HEF4518BT | 9333 732 30653 | 0.2600 | ASIA | WPI | 2,500 | 10/05/2008 | Buy online | not available |
Parametrics/similar products
| Type number | Package | Description | Fmax(MHz) | Propagation Delay(ns) | Voltage | No. of Pins | Power Dissipation Considerations | Logic Switching Levels | Output Drive Capability |
|---|---|---|---|---|---|---|---|---|---|
| HEF4518BP | SOT38-4
(DIP16) | Dual BCD Counter | 40 @ 15 V | 40@15V | 4.5-15.5 V | 16 | Low Power or Automotive Applications | CMOS | +/- 2.4 mA @ 15 V |
| HEF4518BT | SOT109-1
(SO16) | Dual BCD Counter | 40 @ 15 V | 40@15V | 4.5-15.5 V | 16 | Low Power or Automotive Applications | CMOS | +/- 2.4 mA @ 15 V |
Similar products
HEF4518B MSI links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.
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