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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

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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

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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 leakage current; HIGH; On 5 10 15 IOZH SYMBOL - - - - - - -40 MIN. output voltage LOW; On VOL MAX. 0.75 0.75 0.75 2 2 2 - - - - - - + 25 MIN. MAX. 0.75 0.75 0.75 2 2 2 - - - - - - + 85 MIN. MAX. 1.5 1.5 1.5 15 15 15 µA V UNIT

HEF4894B

CONDITIONS

VI = VSS or VDD; Io < 20 mA Vo = 15 V

AC CHARACTERISTICS VSS = 0 V; Tamb = 25 °C; input transition times 20 ns. PARAMETER Dynamic power dissipation per package (P) VDD (V) 5 10 15 TYPICAL FORMULA FOR P (µW) 1200 fi + (foCL) × VDD2 5550 fi + (foCL) × 15000 fi + (foCL) × VDD2 VDD2 where: Rload = fi = input frequency (MHz), fo = output frequency (MHz), CL = load capacitance (pF), (foCL) = sum of outputs VDD = supply voltage (V) AC CHARACTERISTICS VSS = 0 V; Tamb = 25 °C; CL = 50 pF; input transition times 20 ns. PARAMETER Propagation delay CP to Os HIGH to LOW Propagation delay CP to Os LOW to HIGH Propagation delay CP to Os' HIGH to LOW Propagation delay CP to Os' LOW to HIGH VDD (V) 5 10 15 5 10 15 5 10 15 5 10 15 tPLH tPHL tPLH tPHL SYMBOL TYP. 160 65 45 130 55 40 120 50 40 130 60 45 MAX. 320 130 90 260 110 80 240 100 80 260 120 90 ns ns ns ns UNIT TYPICAL EXTRAPOLATION FORMULA 132 ns + (0.55 ns/pF) CL 53 ns + (0.23 ns/pF) CL 37 ns + (0.16 ns/pF) CL 102 ns + (0.55 ns/pF) CL 44 ns + (0.23 ns/pF) CL 32 ns + (0.16 ns/pF) CL 92 ns + (0.55 ns/pF) CL 39 ns + (0.23 ns/pF) CL 32 ns + (0.16 ns/pF) CL 102 ns + (0.55 ns/pF) CL 49 ns + (0.23 ns/pF) CL 37 ns + (0.16 ns/pF) CL

January 1995

4

Philips Semiconductors

Product specification

12-stage shift-and-store register LED driver

HEF4894B

PARAMETER Propagation delay CP to On OFF to LOW Propagation delay CP to On LOW to OFF Propagation delay STR to On OFF to LOW Propagation delay STR to On LOW to OFF Output transition time; Os, Os' HIGH to LOW Output transition time; Os, Os' LOW to HIGH Note

VDD (V) 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15

SYMBOL

TYP. 240

MAX. 480 160 110 340 150 120 280 140 110 200 100 70 170 80 60 170 80 60

UNIT

TYPICAL EXTRAPOLATION FORMULA see note 1

tPZL

80 55 170

ns

tPLZ

75 60 140

ns

see note 1

tPZL

70 55 100

ns

see note 1

tPLZ

40 35 85

ns

see note 1 35 ns + (1.0 ns/pF) CL

tTHL

40 30 85

ns

19 ns + (0.42 ns/pF) CL 16 ns + (0.28 ns/pF) CL 35 ns + (1.0 ns/pF) CL

tTLH

40 30

ns

19 ns + (0.42 ns/pF) CL 16 ns + (0.28 ns/pF) CL

1. Definition of symbol equivalent to 3-state outputs. AC CHARACTERISTICS VSS = 0 V; Tamb = 25 °C; CL = 50 pF; input transition times 20 ns. PARAMETER output enable time EO to On OFF to LOW output disable time EO to On LOW to OFF minimum clock pulse width LOW minimum strobe pulse width HIGH VDD (V) 5 10 15 5 10 15 5 10 15 5 10 15 tWSTRH tWCPL tPLZ SYMBOL tPZL MIN. - - - - - - 60 30 24 80 60 24 TYP. 100 55 50 80 40 30 30 15 12 40 30 12 MAX. 200 110 100 160 80 60 - - - - - - ns ns ns ns UNIT

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Philips Semiconductors

Product specification

12-stage shift-and-store register LED driver

HEF4894B

PARAMETER set-up time D to CP hold time D to CP Maximum clock pulse frequency

VDD (V) 5 10 15 5 10 15 5 10 15

SYMBOL tsu

MIN. 60 20 15

TYP. 30 10 5 -15 5 5 10 22 28

MAX. - - - - - - - - - ns ns

UNIT

thold

5 20 20

fmax

5 11 14

MHz

Fig.5 Timing diagram.

January 1995

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Philips Semiconductors

Product specification

12-stage shift-and-store register LED driver
APPLICATION INFORMATION An example of applications for the HEF4894B is: · Serial-to-parallel converting LED driver

HEF4894B

Fig.6 LED driver register.

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