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HEF4557B LSI
General description
The HEF4557B is a static clocked serial shift register whose length may be programmed to be any number of bits between 1 and 64. The number of bits selected is equal to the sum of the subscripts of the enabled length control inputs (L1, L2<,/sub>L4, L8, L16, and L32, ) plus one. Serial data may be selected from the DA or DB data inputs with the A/B select input. This feature is useful for recirculation purposes. Information on DA or DB is shifted into the first register position and all the data in the register is shifted one position to the right on the LOW to HIGH transition of CP0 while CP1 is LOW or on the HIGH to LOW transition of CP1 while CP0 is HIGH. A HIGH on master reset (MR) resets the register and forces O to LOW and O to HIGH, independent of the other inputs.
Products/packages
| Type number | North American Type number | Ordering code (12NC) | Product status | Package | Packing | Marking | Chemical content | Leadfree conversion date |
|---|---|---|---|---|---|---|---|---|
| HEF4557BP | HEF4557BPN | 9333 343 30652 | Volume production | SOT38-4
(DIP16) | Bulk Pack, CECC | Standard Marking | HEF4557BP
| Always Pb-free |
| HEF4557BT | HEF4557BTD | 9333 733 30652 | Volume production | SOT109-1
(SO16) | Bulk Pack, CECC | Standard Marking | HEF4557BT
| week 4, 2004 |
| HEF4557BT | HEF4557BTD-T | 9333 733 30653 | Volume production | SOT109-1
(SO16) | Reel Pack, SMD, 13", CECC | Standard Marking | HEF4557BT
| week 4, 2004 |
Pricing/ordering/availability
| Type number | Ordering code(12NC) | Indicative price/unit($) | Region | Distributor | In stock | Order quantity | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|---|
| HEF4557BP | 9333 343 30652 | 0.7900 | Order samples | ||||||
| HEF4557BT | 9333 733 30652 | 0.6700 | NA | FUTURE ELECTRONICS | 46 | 1/7/2009 | Buy online | not available | |
| HEF4557BT | 9333 733 30653 | 0.6700 | Order samples |
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 |
|---|---|---|---|---|---|---|---|---|---|
| HEF4557BP | SOT38-4
(DIP16) | 1-to-64 Bit Variable Length Shift Register | 20 @ 15 V | 65@15V | 4.5-15.5 V | 16 | Low Power or Automotive Applications | CMOS | +/- 2.4 mA @ 15 V |
| HEF4557BT | SOT109-1
(SO16) | 1-to-64 Bit Variable Length Shift Register | 20 @ 15 V | 65@15V | 4.5-15.5 V | 16 | Low Power or Automotive Applications | CMOS | +/- 2.4 mA @ 15 V |
Similar products
HEF4557B LSI
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