Datasheet

ManualsBrandsNXP SEMICONDUCTORS ManualsLogic ICsLogic IC - Shift register Shift register Three-state SO 20

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.

It operates over a recommended V

power supply range of 3 V to 15 V referenced to V

(usually ground). Unused inputs must be connected to V

, V

, or another input.

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

HEF4894B

12-stage shift-and-store register LED driver

Rev. 8 — 22 November 2011 Product data sheet

Table 1. Ordering information

All types operate from





C to +125



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

Summary of content (19 pages)

PAGE 1
HEF4894B 12-stage shift-and-store register LED driver Rev. 8 — 22 November 2011 Product data sheet 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.
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HEF4894B NXP Semiconductors 12-stage shift-and-store register LED driver 4. Functional diagram 2 3 1 CP STR QS1 11 QS2 12 QP0 4 QP1 5 QP2 6 QP3 7 QP4 8 QP5 9 QP6 18 D QP7 17 QP8 16 QP9 15 QP10 14 QP11 13 OE 19 Fig 1. 001aai639 Logic Symbol D CP 2 12 12-STAGE SHIFT REGISTER 3 11 STR OE 1 QS1 12-BIT STORAGE REGISTER 19 OPEN-DRAIN OUTPUTS 4 5 QP0 6 7 QP2 QP1 Fig 2.
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HEF4894B NXP Semiconductors 12-stage shift-and-store register LED driver STAGE 0 D D Q STAGE 1 TO 10 D Q10S STAGE 11 D FF0 D FF11 CP QS1 Q Q QS2 LATCH CP LE CP D D Q Q LATCH LATCH LE LE STR OE QP0 QP1 Fig 3. QP11 QP10 001aag119 Logic diagram 5. Pinning information 5.1 Pinning STR 1 20 VDD D 2 19 OE CP 3 18 QP6 QP0 4 17 QP7 QP1 5 16 QP8 HEF4894B QP2 6 15 QP9 QP3 7 14 QP10 QP4 8 13 QP11 QP5 9 12 QS2 VSS 10 11 QS1 001aag117 Fig 4.
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HEF4894B NXP Semiconductors 12-stage shift-and-store register LED driver 5.2 Pin description Table 2. Pin description Symbol Pin Description D 2 serial input QP0 to QP11 4, 5, 6, 7, 8, 9, 18, 17, 16, 15, 14, 13 parallel output QS1 11 serial output QS2 12 serial output CP 3 clock input STR 1 strobe input OE 19 output enable input VDD 20 supply voltage VSS 10 ground (0 V) 6. Functional description Table 3.
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HEF4894B NXP Semiconductors 12-stage shift-and-store register LED driver clock input data input strobe input output enable input internal Q0S (FF 1) QP0 output internal Q10S (FF 11) QP10 output serial QS1 output serial QS2 output 001aag121 Fig 5. Timing diagram 7. Limiting values Table 4. Limiting values In accordance with the Absolute Maximum Rating System (IEC 60134).
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HEF4894B NXP Semiconductors 12-stage shift-and-store register LED driver 8. Recommended operating conditions Table 5. Recommended operating conditions Symbol Parameter VDD Conditions Min Typ Max Unit supply voltage 3 - 15 V VI input voltage 0 - VDD V Tamb ambient temperature in free air 40 - +125 C t/V input transition rise and fall rate VDD = 5 V - - 3.75 s/V VDD = 10 V - - 0.5 s/V VDD = 15 V - - 0.08 s/V 9. Static characteristics Table 6.
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HEF4894B NXP Semiconductors 12-stage shift-and-store register LED driver Table 6. Static characteristics …continued VSS = 0 V; VI = VSS or VDD; unless otherwise specified.
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HEF4894B NXP Semiconductors 12-stage shift-and-store register LED driver Table 7. Dynamic characteristics …continued VSS = 0 V; Tamb = 25 C unless otherwise specified. For test circuit see Figure 10.
PAGE 9
HEF4894B NXP Semiconductors 12-stage shift-and-store register LED driver 11. Waveforms 1/fclk(max) VI VM CP input VSS tW tW tPLZ tPZL VDD VY QPn output VX VOL tPLH VOH tPHL 90 % VM QS1 output VOL 10 % tTHL tTLH tPLH VOH tPHL 90 % VM QS2 output 10 % VOL tTLH tTHL 001aag222 Parallel output measurement points are given in Table 9. VOL and VOH are typical output voltage levels that occur with the output load. Fig 6.
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HEF4894B NXP Semiconductors 12-stage shift-and-store register LED driver VI OE input VM VSS tPLZ tPZL VDD output LOW to OFF-state OFF-state to LOW VOL VY VX outputs enabled outputs disabled outputs enabled 001aag803 Measurement points are given in Table 9. VOL is the typical output voltage level that occurs with the output load. Fig 8.
PAGE 11
HEF4894B NXP Semiconductors 12-stage shift-and-store register LED driver VI 90 % input pulse VSS 10 % tf tr VEXT VDD G VI VO RL DUT CL RT 001aag804 Test data is given in Table 10. Definitions for test circuit: DUT = Device Under Test; RL = Load resistance; CL = load capacitance; RT = Termination resistance should be equal to output impedance of Zo of the pulse generator; VEXT = External voltage for measuring switching times. Fig 10. Test circuit for measuring switching times Table 10.
PAGE 12
HEF4894B NXP Semiconductors 12-stage shift-and-store register LED driver 12. Application information Application example: serial-to-parallel data converting LED driver. VDD VDD QP0 QP1 VDD QP10 QP11 HEF4894B QS2 D OE PWM dimmer input STR CP VSS QP0 QP1 VDD D OE STR QP10 QP11 QS2 HEF4894B CP VSS CONTROL AND SYNC CIRCUITRY DATA CLOCK from remote processor 001aag122 Fig 11.
PAGE 13
HEF4894B NXP Semiconductors 12-stage shift-and-store register LED driver 13. Package outline DIP20: plastic dual in-line package; 20 leads (300 mil) SOT146-1 ME seating plane D A2 A A1 L c e Z b1 w M (e 1) b MH 11 20 pin 1 index E 1 10 0 5 10 mm scale DIMENSIONS (inch dimensions are derived from the original mm dimensions) UNIT A max. A1 min. A2 max. b b1 c mm 4.2 0.51 3.2 1.73 1.30 0.53 0.38 0.36 0.23 26.92 26.54 inches 0.17 0.02 0.13 0.068 0.051 0.021 0.015 0.
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HEF4894B NXP Semiconductors 12-stage shift-and-store register LED driver SO20: plastic small outline package; 20 leads; body width 7.5 mm SOT163-1 D E A X c HE y v M A Z 20 11 Q A2 A (A 3) A1 pin 1 index θ Lp L 10 1 e bp detail X w M 0 5 10 mm scale DIMENSIONS (inch dimensions are derived from the original mm dimensions) UNIT A max. A1 A2 A3 bp c D (1) E (1) e HE L Lp Q v w y mm 2.65 0.3 0.1 2.45 2.25 0.25 0.49 0.36 0.32 0.23 13.0 12.6 7.6 7.4 1.27 10.
PAGE 15
HEF4894B NXP Semiconductors 12-stage shift-and-store register LED driver TSSOP20: plastic thin shrink small outline package; 20 leads; body width 4.4 mm SOT360-1 E D A X c HE y v M A Z 11 20 Q A2 (A 3) A1 pin 1 index A θ Lp L 1 10 e detail X w M bp 0 2.5 5 mm scale DIMENSIONS (mm are the original dimensions) UNIT A max. A1 A2 A3 bp c D (1) E (2) e HE L Lp Q v w y Z (1) θ mm 1.1 0.15 0.05 0.95 0.80 0.25 0.30 0.19 0.2 0.1 6.6 6.4 4.5 4.3 0.65 6.6 6.
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HEF4894B NXP Semiconductors 12-stage shift-and-store register LED driver 14. Revision history Table 11. Revision history Document ID Release date Data sheet status Change notice Supersedes HEF4894B v.8 20111122 Product data sheet - HEF4894B v.7 Modifications: • • Section Applications removed Table 6: IOH minimum values changed to maximum HEF4894B v.7 20100813 Product data sheet - HEF4894B v.6 HEF4894B v.6 20100408 Product data sheet - HEF4894B v.5 HEF4894B v.
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HEF4894B NXP Semiconductors 12-stage shift-and-store register LED driver 15. Legal information 15.1 Data sheet status Document status[1][2] Product status[3] Definition Objective [short] data sheet Development This document contains data from the objective specification for product development. Preliminary [short] data sheet Qualification This document contains data from the preliminary specification. Product [short] data sheet Production This document contains the product specification.
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HEF4894B NXP Semiconductors 12-stage shift-and-store register LED driver Non-automotive qualified products — Unless this data sheet expressly states that this specific NXP Semiconductors product is automotive qualified, the product is not suitable for automotive use. It is neither qualified nor tested in accordance with automotive testing or application requirements.
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HEF4894B NXP Semiconductors 12-stage shift-and-store register LED driver 17. Contents 1 2 3 4 5 5.1 5.2 6 7 8 9 10 11 12 13 14 15 15.1 15.2 15.3 15.4 16 17 General description . . . . . . . . . . . . . . . . . . . . . . 1 Features and benefits . . . . . . . . . . . . . . . . . . . . 1 Ordering information . . . . . . . . . . . . . . . . . . . . . 1 Functional diagram . . . . . . . . . . . . . . . . . . . . . . 2 Pinning information . . . . . . . . . . . . . . . . . . . . . . 3 Pinning . . . . . . . . .