HEF4794BT,118 - NEXPERIA - searchdatasheet.com

HEF4794B

8-stage shift-and-store register LED driver

Rev. 9 — 7 November 2018 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

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 VDD power supply range of 3 V to 15 V referenced to VSS (usually

ground). Unused inputs must be connected to VDD, VSS, 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

Table 1. Ordering information

All types operate from -40 °C to +125 °C.

PackageType number

Name Description Version

HEF4794BT SO16 plastic small outline package; 16 leads; body width 3.9 mm SOT109-1

Nexperia HEF4794B

8-stage shift-and-store register LED driver

4. Functional diagram

CP STR

3 1

QP0

QP1

QP2

QP3

QP4

QP5

QP6

QP7

QS1

QS2

001aaf111

Fig. 1. Logic symbol

001aag798

8-STAGE SHIFT

8-BIT STORAGE

OPEN-DRAIN

OUTPUTS

QP0

QP1

QP2

QP3

QP4

QP5

QP6

QP7

10 QS2

9QS1

CP 3

STR 1

OE 15

Fig. 2. Functional diagram

aaa-029301

FF 0

LATCH 0

FF 7

LATCH 7

STAGES 1 TO 6STAGE 0 STAGE 7

QP2QP0

D QS2

QS1

LATCH

QP1

QP4

QP3

QP6

QP5 QP7

STR

Fig. 3. Logic diagram

Product data sheet Rev. 9 — 7 November 2018 2 / 14

Nexperia HEF4794B

8-stage shift-and-store register LED driver

5. Pinning information

5.1. Pinning

HEF4794B

STR VDD

D OE

CP QP4

QP0 QP5

QP1 QP6

QP2 QP7

QP3 QS2

VSS QS1

001aag800

Fig. 4. Pin configuration

5.2. Pin description

Table 2. Pin description

Symbol Pin Description

D 2 serial input

QP0 to QP7 4, 5, 6, 7, 14, 13, 12, 11 parallel output (open-drain)

QS1 9 serial output

QS2 10 serial output

CP 3 clock input

STR 1 strobe input

OE 15 output enable input

VDD 16 supply voltage

VSS 8 ground (0 V)

Product data sheet Rev. 9 — 7 November 2018 3 / 14

Nexperia HEF4794B

8-stage shift-and-store register LED driver

6. Functional description

Table 3. Function table

H = HIGH voltage level; L = LOW voltage level; X = don’t care; Z = high-impedance OFF-state;

↑ = LOW-to-HIGH clock transition; ↓ = HIGH-to-LOW clock transition.

Input Parallel output Serial output

CP OE STR D QP0 QPn QS1[1] QS2[2]

↑ L X X Z Z Q6S no change

↓ L X X Z Z n.c. Q7S

↑ H L X no change no change Q6S no change

↑ H H L Z QPn - 1 Q6S no change

↑ H H H L QPn - 1 Q6S no change

↓ H H H no change no change no change Q7S

[1] Q6S = the data in register stage 6 before the LOW to HIGH clock transition.

[2] Q7S = the data in register stage 7 before the HIGH to LOW clock transition.

001aag801

clock input

data input

strobe input

output enable

input

internal Q0S

(FF0)

QP0 output

internal Q6S

(FF6)

QP6 output

serial QS1

output

serial QS2

output

Z-state

Fig. 5. Timing diagram

Product data sheet Rev. 9 — 7 November 2018 4 / 14

Nexperia HEF4794B

8-stage shift-and-store register LED driver

7. Limiting values

Table 4. Limiting values

In accordance with the Absolute Maximum Rating System (IEC 60134).

Symbol Parameter Conditions Min Max Unit

VDD supply voltage -0.5 +18 V

IIK input clamping current VI < -0.5 V or VI > VDD + 0.5 V - ±10 mA

VIinput voltage -0.5 VDD + 0.5 V

QSn outputs;

VO < -0.5 V or VO > VDD + 0.5 V

- ±10 mAIOK output clamping current

QPn outputs; VO < -0.5 V - 40 mA

IIinput leakage current - ±10 mA

QSn outputs - ±10 mAIOoutput current

QPn outputs - 40 mA

Tstg storage temperature -65 +150 °C

Tamb ambient temperature -40 +125 °C

Tamb = -40 °C to +125 °CPtot total power dissipation

SO16 package [1] - 500 mW

P power dissipation per output - 100 mW

[1] For SO16 package: Ptot derates linearly with 8 mW/K above 70 °C.

8. Recommended operating conditions

Table 5. Recommended operating conditions

Symbol Parameter Conditions Min Max Unit

VDD supply voltage 3 15 V

VIinput voltage 0 VDD V

Tamb ambient temperature in free air -40 +125 °C

VDD = 5 V - 3.75 μs/V

VDD = 10 V - 0.5 μs/V

Δt/ΔV input transition rise and fall rate

VDD = 15 V - 0.08 μs/V

Product data sheet Rev. 9 — 7 November 2018 5 / 14

Nexperia HEF4794B

8-stage shift-and-store register LED driver

9. Static characteristics

Table 6. Static characteristics

VSS = 0 V; VI = VSS or VDD; unless otherwise specified.

Tamb = -40 °C Tamb = 25 °C Tamb = 85 °C Tamb = 125 °CSymbol Parameter Conditions VDD

Min Max Min Max Min Max Min Max

Unit

5 V 3.5 - 3.5 - 3.5 - 3.5 - V

10 V 7.0 - 7.0 - 7.0 - 7.0 - V

VIH HIGH-level

input voltage

|IO| < 1 μA

15 V 11.0 - 11.0 - 11.0 - 11.0 - V

5 V - 1.5 - 1.5 - 1.5 - 1.5 V

10 V - 3.0 - 3.0 - 3.0 - 3.0 V

VIL LOW-level input

voltage

|IO| < 1 μA

15 V - 4.0 - 4.0 - 4.0 - 4.0 V

5 V 4.95 - 4.95 - 4.95 - 4.95 - V

10 V 9.95 - 9.95 - 9.95 - 9.95 - V

VOH HIGH-level

output voltage

QSn outputs;

|IO| < 1 μA

15 V 14.95 - 14.95 - 14.95 - 14.95 - V

5 V - 0.05 - 0.05 - 0.05 - 0.05 V

10 V - 0.05 - 0.05 - 0.05 - 0.05 V

QSn outputs;

|IO| < 1 μA

15 V - 0.05 - 0.05 - 0.05 - 0.05 V

5 V - 0.75 - 0.75 - 1.5 - 1.5 V

10 V - 0.75 - 0.75 - 1.5 - 1.5 V

VOL LOW-level

output voltage

QPn outputs;

|IO| < 20 mA

15 V - 0.75 - 0.75 - 1.5 - 1.5 V

QSn outputs

VO = 2.5 V 5 V - -1.7 - -1.4 - -1.1 - -1.1 mA

VO = 4.6 V 5 V - -0.64 - -0.5 - -0.36 - -0.36 mA

VO = 9.5 V 10 V - -1.6 - -1.3 - -0.9 - -0.9 mA

IOH HIGH-level

output current

VO = 13.5 V 15 V - -4.2 - -3.4 - -2.4 - -2.4 mA

QSn outputs

VO = 0.4 V 5 V 0.64 - 0.5 - 0.36 - 0.36 - mA

VO = 0.5 V 10 V 1.6 - 1.3 - 0.9 - 0.9 - mA

IOL LOW-level

output current

VO = 1.5 V 15 V 4.2 - 3.4 - 2.4 - 2.4 - mA

IIinput leakage

current

15 V - ±0.1 - ±0.1 - ±1.0 - ±1.0 μA

5 V - 2 - 2 - 15 - 15 μA

10 V - 2 - 2 - 15 - 15 μA

IOZ OFF-state

output current

QPn output

is HIGH;

VO = 15 V

15 V - 2 - 2 - 15 - 15 μA

5 V - 5 - 5 - 150 - 150 μA

10 V - 10 - 10 - 300 - 300 μA

IDD supply current IO = 0 A

15 V - 20 - 20 - 600 - 600 μA

CIinput

capacitance

- - - - - 7.5 - - - pF

Product data sheet Rev. 9 — 7 November 2018 6 / 14

Nexperia HEF4794B

8-stage shift-and-store register LED driver

10. Dynamic characteristics

Table 7. Dynamic characteristics

VSS = 0 V; Tamb = 25 °C unless otherwise specified. For test circuit, see Fig. 10.

Symbol Parameter Conditions VDD Extrapolation formula Min Typ Max Unit

5 V [1] 132 ns + (0.55 ns/pF)CL- 160 320 ns

10 V 53 ns + (0.23 ns/pF)CL- 65 130 ns

CP to QS1;

see Fig. 6

15 V 37 ns + (0.16 ns/pF)CL- 45 90 ns

5 V 92 ns + (0.55 ns/pF)CL- 120 240 ns

10 V 39 ns + (0.23 ns/pF)CL- 50 100 ns

tPHL HIGH to LOW

propagation delay

CP to QS2;

see Fig. 6

15 V 32 ns + (0.16 ns/pF)CL- 40 80 ns

5 V [1] 102 ns + (0.55 ns/pF)CL- 130 260 ns

10 V 44 ns + (0.23 ns/pF)CL- 55 110 ns

CP to QS1;

see Fig. 6

15 V 32 ns + (0.16 ns/pF)CL- 40 80 ns

5 V 102 ns + (0.55 ns/pF)CL- 130 260 ns

10 V 49 ns + (0.23 ns/pF)CL- 60 120 ns

tPLH LOW to HIGH

propagation delay

CP to QS2;

see Fig. 6

15 V 37 ns + (0.16 ns/pF)CL- 45 90 ns

5 V - 240 480 ns

10 V - 80 160 ns

CP to QPn;

see Fig. 6

15 V - 55 110 ns

5 V - 140 280 ns

10 V - 70 140 ns

tPZL OFF-state to LOW

propagation delay

STR to QPn;

see Fig. 7

15 V - 55 110 ns

5 V - 170 340 ns

10 V - 75 150 ns

CP to QPn;

see Fig. 6

15 V - 60 120 ns

5 V - 100 200 ns

10 V - 40 100 ns

tPLZ LOW to OFF-state

propagation delay

STR to QPn;

see Fig. 7

15 V - 35 70 ns

5 V [2] - 100 200 ns

10 V - 55 110 ns

ten enable time OE to QPn;

see Fig. 8

15 V - 50 100 ns

5 V [2] - 80 160 ns

10 V - 40 80 ns

tdis disable time OE to QPn;

see Fig. 8

15 V - 30 60 ns

5 V [1][3] 35 ns + (1.00 ns/pF)CL- 85 170 ns

10 V 19 ns + (0.42 ns/pF)CL- 40 80 ns

tttransition time QS1, QS2;

see Fig. 6

15 V 16 ns + (0.28 ns/pF)CL- 30 60 ns

5 V 60 30 - ns

10 V 30 15 - ns

CP LOW and

HIGH; see Fig. 6

15 V 24 12 - ns

5 V 80 40 - ns

10 V 60 30 - ns

tWpulse width

STR HIGH;

see Fig. 7

15 V 24 12 - ns

Product data sheet Rev. 9 — 7 November 2018 7 / 14

Nexperia HEF4794B

8-stage shift-and-store register LED driver

Symbol Parameter Conditions VDD Extrapolation formula Min Typ Max Unit

5 V 60 30 - ns

10 V 20 10 - ns

tsu set-up time D to CP; see Fig. 9

15 V 15 5 - ns

5 V +5 -15 - ns

10 V 20 5 - ns

thhold time D to CP; see Fig. 9

15 V 20 5 - ns

5 V 5 10 - MHz

10 V 11 22 - MHz

fclk(max) maximum clock

frequency

CP; see Fig. 6

15 V 14 28 - MHz

[1] The typical values of the propagation delay and transition times are calculated from the extrapolation formulas shown (CL in pF).

[2] ten is the same as tPZL and tdis is the same as tPLZ

[3] tt is the same as tTLH and tTHL

Table 8. Dynamic power dissipation

PD can be calculated from the formulas shown. VSS = 0 V; tr = tf ≤ 20 ns; Tamb = 25 °C.

Symbol Parameter VDD Typical formula Where

5 V PD = 1 200 x fi + Σ(fo x CL) x VDD

2 μW

10 V PD = 5 550 x fi + Σ(fo x CL) x VDD

2 μW

PDdynamic power dissipation

15 V PD = 15 000 x fi + Σ(fo x CL) x VDD

2 μW

fi = input frequency in MHz;

fo = output frequency in MHz;

CL = output load capacitance in pF;

Σ(fo × CL) = sum of the outputs;

VDD = supply voltage in V.

10.1. Waveforms and test circuit

001aag222

tPLH

1/fclk(max)

VSS

VDD

VOL

tPLZ

tPLH

tPZL

CP input

QS1 output

QS2 output

tTHL

tTLH

90 %

10 %

90 %

10 %

tPHL

tTHL

tTLH

QPn output

tPHL

VOH

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. Propagation delay clock (CP) to output (QPn, QS1, QS2), clock pulse width and maximum clock frequency

Product data sheet Rev. 9 — 7 November 2018 8 / 14

Nexperia HEF4794B

8-stage shift-and-store register LED driver

Table 9. Measurement points

Supply Input Output

VDD VMVMVXVY

5 V to 15 V 0.5VDD 0.5VDD 0.1VO0.9VO

001aag802

CP input

tPLZ tPZL

VSS

STR input

VDD

VOL

QPn output

Measurement points are given in Table 9.

VOL is the typical output voltage level that occurs with the output load.

Fig. 7. Strobe (STR) to output (QPn) propagation delays and the strobe pulse width

001aag803

OE input

output

LOW to OFF-state

OFF-state to LOW

tPZL

tPLZ

outputs

disabled

outputs

enabled

outputs

enabled

VSS

VDD

VOL

Measurement points are given in Table 9.

VOL is the typical output voltage level that occurs with the output load.

Fig. 8. Enable and disable times for input OE

tsu

VSS

VDD

CP input

D input

QPn output

001aag805

VOL

Measurement points are given in Table 9.

The shaded areas indicate when the input is permitted to change for predictable output performance.

VOL is the typical output voltage level that occurs with the output load.

Fig. 9. Set-up and hold times for the data input (D)

Product data sheet Rev. 9 — 7 November 2018 9 / 14

Nexperia HEF4794B

8-stage shift-and-store register LED driver

001aag804

DUT

VEXT

RTCL

10 %

90 %

VIVO

VDD

VSS

input pulse

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. Test data

Supply Input VEXT Load

VDD VItr, tftPLZ, tPZL tPLH, tPHL CLRL

5 V to 15 V VDD ≤ 20 ns VDD open 50 pF 1 kΩ

11. Application information

001aag806

QP0

D S2

PWM

dimmer input

OE STR

data

from remote

control panel

clock

CONTROL

AND

SYNC

CIRCUITRY

QP7

HEF4794B

QP0

D S2

VDD

OE STR CP

QP7

HEF4794B

Fig. 11. Application example: serial-to-parallel data converting LED drivers

Product data sheet Rev. 9 — 7 November 2018 10 / 14

Nexperia HEF4794B

8-stage shift-and-store register LED driver

12. Package outline

w M

detail X

v M A

(A )

pin 1 index

UNIT A

max. A

1 A

2 A

3 b

p c D

(1) E

(1) (1)

e H

E L L

p Q Z y w v θ

REFERENCES

OUTLINE

VERSION

EUROPEAN

PROJECTION ISSUE DATE

IEC JEDEC JEITA

inches

1.75 0.25

0.10

1.45

1.25 0.25 0.49

0.36

0.25

0.19

10.0

9.8

4.0

3.8 1.27 6.2

5.8

0.7

0.6

0.7

0.3 8

0.25 0.1

DIMENSIONS (inch dimensions are derived from the original mm dimensions)

Note

1. Plastic or metal protrusions of 0.15 mm (0.006 inch) maximum per side are not included.

1.0

0.4

SOT109-1 99-12-27

03-02-19

076E07 MS-012

0.069 0.010

0.004

0.057

0.049 0.01 0.019

0.014

0.0100

0.0075

0.39

0.38

0.16

0.15 0.05

1.05

0.041

0.244

0.228

0.028

0.020

0.028

0.012

0.01

0.25

0.01 0.004

0.039

0.016

0 2.5 5 mm

scale

SO16: plastic small outline package; 16 leads; body width 3.9 mm SOT109-1

Fig. 12. Package outline SOT109-1 (SO16)

Product data sheet Rev. 9 — 7 November 2018 11 / 14

Nexperia HEF4794B

8-stage shift-and-store register LED driver

13. Revision history

Table 11. Revision history

Document ID Release date Data sheet status Change notice Supersedes

HEF4794B v.9 20181107 Product data sheet - HEF4794B v.8

Modifications: •The format of this data sheet has been redesigned to comply with the identity guidelines of

Nexperia.

•Legal texts have been adapted to the new company name where appropriate.

•Fig. 3 and Fig. 5 corrected.

HEF4794B v.8 20160404 Product data sheet - HEF4794B v.7

Modifications: •Type number HEF4794BP (SOT38-4) removed.

HEF4794B v.7 20111116 Product data sheet - HEF4794B v.6

Modifications: •Section Applications removed

••Table 6:

•IOH minimum values changed to maximum

•added the unit pF for CI

HEF4794B v.6 20100901 Product data sheet - HEF4794B v.5

HEF4794B v.5 20100402 Product data sheet - HEF4794B v.4

HEF4794B v.4 20091222 Product data sheet - HEF4794B v.3

HEF4794B v.3 20080812 Product data sheet - HEF4794B v.2

HEF4794B v.2 19990630 Product specification - HEF4794B v.1

HEF4794B v.1 19940701 Product specification - -

Product data sheet Rev. 9 — 7 November 2018 12 / 14

Nexperia HEF4794B

8-stage shift-and-store register LED driver

14. Legal information

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.

[1] Please consult the most recently issued document before initiating or

completing a design.

[2] The term 'short data sheet' is explained in section "Definitions".

[3] The product status of device(s) described in this document may have

changed since this document was published and may differ in case of

multiple devices. The latest product status information is available on

the internet at https://www.nexperia.com.

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product data given in the Limiting values and Characteristics sections of this

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or warranty that such applications will be suitable for the specified use

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Limiting values — Stress above one or more limiting values (as defined in

the Absolute Maximum Ratings System of IEC 60134) will cause permanent

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Notice: All referenced brands, product names, service names and

trademarks are the property of their respective owners.

Product data sheet Rev. 9 — 7 November 2018 13 / 14

Nexperia HEF4794B

8-stage shift-and-store register LED driver

Contents

1. General description......................................................1

2. Features and benefits.................................................. 1

3. Ordering information....................................................1

4. Functional diagram.......................................................2

5. Pinning information......................................................3

5.1. Pinning.........................................................................3

5.2. Pin description............................................................. 3

6. Functional description................................................. 4

7. Limiting values............................................................. 5

8. Recommended operating conditions..........................5

9. Static characteristics....................................................6

10. Dynamic characteristics............................................ 7

10.1. Waveforms and test circuit........................................ 8

11. Application information............................................10

12. Package outline........................................................ 11

13. Revision history........................................................12

14. Legal information......................................................13

For more information, please visit: http://www.nexperia.com

For sales office addresses, please send an email to: salesaddresses@nexperia.com

Date of release: 7 November 2018

Product data sheet Rev. 9 — 7 November 2018 14 / 14