1.

General description

The HEF4894B is a 12-stage serial shift register. It has a storage latch associated with

each stage for strobing data from the serial input (D) to the parallel LED driver outputs

(QP0 to QP11). Data is shifted on positive-going clock (CP) transitions. The data in each

shift register stage is transferred to the storage register when the strobe (STR) input is

HIGH. Data in the storage register appears at the output whenever the output enable (OE)

input signal is HIGH.

Two serial outputs (QS1 and QS2) are available for cascading a number of HEF4894B

devices. Serial data is available at QS1 on positive-going clock edges to allow high-speed

operation in cascaded systems with a fast clock rise time. The same serial data is

available at QS2 on the next negative going clock edge. This is used for cascading

HEF4894B devices when the clock has a slow rise time.

also suitable for use over both the industrial (

−40 °C to +85 °C) and automotive (−40 °C to

+125

°C) temperature ranges.

2.

Features and benefits

Fully static operation

5 V, 10 V, and 15 V parametric ratings

Standardized symmetrical output characteristics

Operates across the automotive temperature range from

−40 °C to +125 °C

Complies with JEDEC standard JESD 13-B

3.

Applications

Automotive and industrial

4.

Ordering information

HEF4894B

12-stage shift-and-store register LED driver

Rev. 7 — 13 August 2010

Product data sheet

Table 1.

Ordering information

All types operate from

Type number

Package

Name

Description

Version

HEF4894BP

DIP20

plastic dual in-line package; 20 leads (300 mil)

SOT146-1

HEF4894BT

SO20

plastic small outline package; 20 leads; body width 7.5 mm

SOT163-1

HEF4894BTT

TSSOP20

plastic thin shrink small outline package; 20 leads; body width 4.4 mm

SOT360-1