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INTEGRATED CIRCUITS DATA SHEET For a complete data sheet, please also download: · The IC04 LOCMOS HE4000B Logic Family Specifications HEF, HEC · The IC04 LOCMOS HE4000B Logic Package Outlines/Information HEF, HEC HEF4894B 12-stage shift-and-store register LED driver Product specification File under Integrated Circuits, IC04 January 1995 Philips Semiconductors Product specification 12-stage shift-and-store register LED driver APPLICATIONS · Automotive · Industrial GENERAL DESCRIPTION The HEF4894B is a 12 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 O11. Data is shifted on positive-going clock 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 outputs whenever the output enable (EO) signal is HIGH. Two serial outputs (Os and Os') are available for cascading a number of HEF4894B 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 HEF4894B devices when the clock rise time is slow. ORDERING AND PACKAGE INFORMATION TYPE NUMBER HEF4894BT HEF4894BP PINNING PIN 1 2 3 D CP SYMBOL STR PACKAGES PINS 20 20 PIN POSITION SO DIL MATERIAL plastic plastic HEF4894B CODE SO20/SOT163A DIL20/SOT146 NAME AND FUNCTION strobe input data input clock input parallel outputs (open drain) ground serial outputs output enable input positive supply voltage 4, 5, 6, 7, 8, 9, 18, O0 to O11 17, 16, 15, 14, 13 10 11, 12 19 20 FAMILY DATA Vss Os, Os' EO VDD See Family Specifications except for: Rating for DC current into any open-drain output: 40 mA. IDD LIMITS category MSI: see Family Specifications. Preliminary pin assignment. Fig.1 Pinning diagram. Fig.2 Functional diagram. January 1995 2 Philips Semiconductors Product specification 12-stage shift-and-store register LED driver HEF4894B Fig.3 Logic diagram. FUNCTION TABLE INPUTS CP Fig.4 One D-latch. Notes 1. H = HIGH state (the more positive voltage) 2. L = LOW state (the less positive voltage) 3. X = state is immaterial 4. = positive-going transition 5. = negative-going transition 6. Z = high impedance OFF state 7. nc = no change 8. O11' = the information in the twelfth shift register stage. At the positive clock edge the information in the 10th register stage is transferred to the 11th register stage and the Os output. EO L L H H H H STR X X L H H H D X X X L H H PARALLEL OUTPUTS O0 Z Z nc Z L nc On Z Z nc On - 1 On - 1 nc SERIAL OUTPUTS OS O10' nc O10' O10' O10' nc OS' nc O11 nc nc nc O11 January 1995 3 Philips Semiconductors Product specification 12-stage shift-and-store register LED driver DC CHARACTERISTICS VSS = 0 V. Tamb (°C) PARAMETER VDD (V) 5 10 15 output l