HEF4794BP,112 NXP

HEF4794B 8-stage shift-and-store register LED driver Rev. 7 16 November 2011 Product data sheet 1. General description The HEF4794B is an 8-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 QP7). Data is shifted on the positive-going clock (CP) transitions. The data in each shift register stage is transferred to the storage register when the strobe input (STR) is HIGH. Data in the storage register appears at the outputs whenever the output enable input (OE) signal is HIGH. Two serial outputs (QS1 and QS2) are available for cascading a number of HEF4794B 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 HEF4794B devices when the clock has a slow rise time. It operates over a recommended V power supply range of 3 V to 15 V referenced to V DD SS (usually ground). Unused inputs must be connected to V , V , or another input. DD SS 2. 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 and 40 C to +125 C Complies with JEDEC standard JESD 13-B 3. Ordering information Table 1. Ordering information All types operate from 40 C to +125 C. Type number Package Name Description Version HEF4794BP DIP16 plastic dual in-line package; 16 leads (300 mil) SOT38-4 HEF4794BT SO16 plastic small outline package; 16 leads; body width 3.9 mm SOT109-1HEF4794B NXP Semiconductors 8-stage shift-and-store register LED driver 4. Functional diagram 31 CP STR 2 QS1 9 D 10 8-STAGE SHIFT QS2 3 REGISTER QS2 10 CP 9 QP0 4 QS1 QP1 5 1 8-BIT STORAGE STR REGISTER QP2 6 2 D QP3 7 15 OPEN-DRAIN QP4 14 OE OUTPUTS QP5 13 4 5 6 7 14 13 12 11 QP6 12 QP0 QP2 QP4 QP6 QP7 11 QP1 QP3 QP5 QP7 001aag798 OE 15 001aaf111 Fig 1. Logic symbol Fig 2. Functional diagram STAGE 0 STAGES 1 TO 6 STAGE 7 D D Q D Q D Q QS1 CP CP D Q QS2 FF 0 FF 7 CP CP LE LATCH D Q D Q LE LE LATCH 0 LATCH 7 STR OE 001aag799 QP0 QP2 QP4 QP6 QP1 QP3 QP5 QP7 Fig 3. Logic diagram HEF4794B All information provided in this document is subject to legal disclaimers. NXP B.V. 2011. All rights reserved. Product data sheet Rev. 7 16 November 2011 2 of 18