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Número de pieza | HEF4794B | |
Descripción | 8-stage shift-and-store register LED driver | |
Fabricantes | NXP Semiconductors | |
Logotipo | ||
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No Preview Available ! HEF4794B
8-stage shift-and-store register LED driver
Rev. 7 — 16 November 2011
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 register appears at the outputs whenever the output enable
input (OE) signal is HIGH.
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.
Type number Package
Name
Description
HEF4794BP
DIP16
plastic dual in-line package; 16 leads (300 mil)
HEF4794BT
SO16
plastic small outline package; 16 leads; body width 3.9 mm
Version
SOT38-4
SOT109-1
1 page NXP Semiconductors
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
VDD supply voltage
IIK
input clamping current
VI < 0.5 V or VI > VDD + 0.5 V
VI input voltage
IOK
output clamping current
QSn outputs;
VO < 0.5 V or VO > VDD + 0.5 V
QPn outputs; VO < 0.5 V
II input leakage current
IO output current
QSn outputs
QPn outputs
Tstg
Tamb
Ptot
storage temperature
ambient temperature
total power dissipation
Tamb = 40 C to +125 C
DIP16 package
SO16 package
P power dissipation
per output
Min
0.5
-
0.5
-
-
-
-
-
65
40
[1] -
[2] -
-
[1] For DIP16 package: Ptot derates linearly with 12 mW/K above 70 C.
[2] For SO16 package: Ptot derates linearly with 8 mW/K above 70 C.
8. Recommended operating conditions
Max
+18
10
VDD + 0.5
10
Unit
V
mA
V
mA
40
10
10
40
+150
+125
mA
mA
mA
mA
C
C
750 mW
500 mW
100 mW
Table 5.
Symbol
VDD
VI
Tamb
t/V
Recommended operating conditions
Parameter
Conditions
supply voltage
input voltage
ambient temperature
in free air
input transition rise and fall rate
VDD = 5 V
VDD = 10 V
VDD = 15 V
Min Max
Unit
3 15
V
0
VDD
V
40 +125 C
- 3.75 s/V
- 0.5 s/V
- 0.08 s/V
HEF4794B
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 7 — 16 November 2011
© NXP B.V. 2011. All rights reserved.
5 of 18
5 Page NXP Semiconductors
HEF4794B
8-stage shift-and-store register LED driver
VI 90 %
input pulse
10 %
VSS
tr
VI
G
VDD
DUT
RT
tf
VEXT
RL
VO
CL
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. Test data
Supply
Input
VDD
5 V to 15 V
VI
VDD
tr, tf
20 ns
VEXT
tPLZ, tPZL
VDD
tPLH, tPHL
open
Load
CL
50 pF
RL
1 k
HEF4794B
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 7 — 16 November 2011
© NXP B.V. 2011. All rights reserved.
11 of 18
11 Page |
Páginas | Total 18 Páginas | |
PDF Descargar | [ Datasheet HEF4794B.PDF ] |
Número de pieza | Descripción | Fabricantes |
HEF4794B | 8-stage shift-and-store register LED driver | NXP Semiconductors |
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