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INTEGRATED CIRCUITS DATA SHEET HEF4794B 8-stage shift-and-store register LED driver Product specification Supersedes data of 1994 Jul 01 File under Integrated Circuits, IC04 1999 Jun 30 Philips Semiconductors Product specification 8-stage shift-and-store register LED driver APPLICATIONS · Automotive · Industrial. GENERAL DESCRIPTION The HEF4794B is an 8-stage serial shift register having a storage latch associated with each stage for strobing data from the serial input to parallel LED driver outputs O0 to O7. Data is shifted on positive-going clock transitions. The data in each shift register stage is ORDERING INFORMATION PACKAGES TYPE NUMBER PINS HEF4794BT HEF4794BP FUNCTIONAL DIAGRAM 16 16 PIN POSITION SO16 DIP16 MATERIAL plastic plastic LOGIC DIAGRAMS HEF4794B transferred to the storage register when the strobe (STR) input is HIGH. Data in the storage register appears at the outputs whenever the output enable (EO) signal is HIGH. Two serial outputs (OS and OS') are available for cascading a number of HEF4794B devices. Data is available at OS on positive-going clock edges to allow high-speed operation in cascaded systems in which the clock rise time is fast. The same serial information is available at OS' on the next negative-going clock edge and provides cascading HEF4794B devices when the clock rise time is slow. CODE SOT109-1 SOT38-1 V DD 16 D 2 CP 3 8-STAGE SHIFT REGISTER HEF4794B 10 O S' 9 OS D handbook, halfpage STR 1 8-BIT STORAGE REGISTER CP O MBD912 EO 15 OPEN-DRAIN OUTPUTS 8 4 5 O1 6 7 14 O4 13 12 11 O7 MBD909 VSS O 0 O2 O3 O5 O6 Fig.1 Functional diagram. Fig.2 One D-latch. 1999 Jun 30 2 Philips Semiconductors Product specification 8-stage shift-and-store register LED driver HEF4794B handbook, full pagewidth STAGE 0 D D CP FF 1 CP O D STAGE 1 to 6 O STAGE 7 D CP FF 8 D CP latch Q OS ' O OS D CP O D CP O latch 1 STR latch 8 EO HEF4794B MBD911 O0 O 1 O2 O 3 O 4 O 5 O 6 O7 Fig.3 Logic diagram. PINNING SYMBOL STR D CP O0 to O3 VSS OS,OS' O7 O6 O5 O4 EO VDD PIN 1 2 3 4 to 7 8 9 and 10 11 12 13 14 15 16 DESCRIPTION strobe input data input clock input parallel outputs 0 to 3 (open drain) ground serial outputs parallel output 7 (open drain) parallel output 6 (open drain) parallel output 5 (open drain) parallel output 4 (open drain) output enable input supply voltage CP O0 O1 O2 O3 V SS 3 4 HEF4794B 5 6 7 8 MBD910 handbook, halfpage STR D 1 2 16 VDD 15 EO 14 O 4 13 O 5 12 O 6 11 O 7 10 O S' 9 OS Fig.4 Pin configuration. 1999 Jun 30 3 Philips Semiconductors Product specification 8-stage shift-and-store register LED driver FUNCTIONAL DESCRIPTION Table 1 Function table; note 1 INPUTS CP Note 1. H = HIGH state; L = LOW state; X = don't care; = positive-going transition; = negative-going transition; Z = high-impedance OFF state; nc = no change; O6' = the information in the seventh shift register stage. a) At the positive clock edge the information in the 7th register stage is