HEF4021B

General description

The HEF4021B is an 8-bit static shift register (parallel-to-serial converter) with a synchronous serial data input (D_S ), a clock input (CP), an asynchronous active HIGH parallel load input (PL), eight asynchronous parallel data inputs (P₀ to P₇ ) and buffered parallel outputs from the last three stages (0₅ to O₇ ).

Each register stage is a D-type master-slave flip-flop with a set direct/clear direct input. Information on P₀ to P₇ is asynchronously loaded into the register while PL is HIGH, independent of CP and DS. When PL is LOW, data on DS 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 CP. Schmitt-trigger action in the clock input makes the circuit highly tolerant to slower clock rise and fall times.

Features

• Pin compatibility to the PCA82C200 stand-alone CAN controller
• Electrical compatibility to the PCA82C200 stand-alone CAN controller
• Software-compatibility mode to the PCA82C200 (BasicCAN mode is default)
• Extended receive buffer (64-byte FIFO)
• CAN 2.0B protocol compatibility (extended frame passive in PCA82C200 compatibility mode)
• Supports 11-bit identifier as well as 29-bit identifier
• Bit rates up to 1 Mbits/s
• PeliCAN mode extensions:
  - Error counters with read/write access
  - Programmable error warning limit
  - Last error code register
  - Error interrupt for each CAN-bus error
  - Arbitration lost interrupt with detailed bit position
  - Single-shot transmission (no re-transmission)
  - Listen only mode (no acknowledge, no active error flags)
  - Hot plugging support (software driven bit rate detection)
  - Acceptance filter extension (4-byte code, 4-byte mask)
  - Reception of ?own? messages (self reception request)
• 24 MHz clock frequency
• Interfaces to a variety of microprocessors
• Programmable CAN output driver configuration
• Extended ambient temperature range (-40 to +125 °C).

Products/packages

Pricing/ordering/availability

Applications

• Telecom equipment
• Portable instruments
• Point-of-sale terminals.

Block diagrams/pinning

Parametrics/similar products

Similar products

HEF4021B 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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