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HEF4557BT

1-to-64 bit variable length shift register

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, 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 Q to LOW and Q to HIGH, independent of the other inputs.

It operates over a recommended VDD power supply range of 3 V to 15 V referenced to VSS (usually ground). Unused inputs must be connected to VDD, VSS, or another input.

This product has been discontinued, click here for discontinuation information and replacement parts.

Features and benefits

  • Fully static operation

  • 5 V, 10 V, and 15 V parametric ratings

  • Standardized symmetrical output characteristics

  • Specified from -40 °C to +85 °C

  • Complies with JEDEC standard JESD 13-B

Applications

Parametrics

Type number Product status VCC (V) Logic switching levels Output drive capability (mA) tpd (ns) fmax (MHz) Nr of bits Power dissipation considerations Tamb (°C) Rth(j-a) (K/W) Ψth(j-top) (K/W) Rth(j-c) (K/W)
HEF4557BT End of life 3.0 - 15 CMOS ± 2.4 65 20 64 medium -40~85 49 1.0 8

Package

All type numbers in the table below are discontinued. See the table Discontinuation information for more information.

Type number Orderable part number, (Ordering code (12NC)) Status Marking Package Package information Reflow-/Wave soldering Packing
HEF4557BT HEF4557BT,652
(933373330652)		 Obsolete no package information
HEF4557BT,653
(933373330653)		 Obsolete

Environmental information

All type numbers in the table below are discontinued. See the table Discontinuation information for more information.

Type number Orderable part number Chemical content RoHS RHF-indicator
HEF4557BT HEF4557BT,652 HEF4557BT rohs rhf rhf
HEF4557BT HEF4557BT,653 HEF4557BT rohs rhf rhf
Quality and reliability disclaimer

Series

Documentation (2)

File name Title Type Date
HEF4557B 1-to-64 bit variable length shift register Data sheet 2017-03-17
AN11051 Pin FMEA HEF4000 family Application note 2019-01-09

Support

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Models

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How does it work?

The interactive datasheets are based on the Nexperia MOSFET precision electrothermal models. With our interactive datasheets you can simply specify your own conditions interactively. Start by changing the values of the conditions. You can do this by using the sliders in the condition fields. By dragging the sliders you will see how the MOSFET will perform at the new conditions set.

Interactive datasheet