SGS Thomson Microelectronics L6451 Datasheet
L6451
28 CHANNEL INK JET DRIVER
ADVANCE DATA
40VDMOS OUTPUTBREAKDOWN
PRECISEOUTPUTENERGY
ESD OUTPUT PROTECTION WITH CLAMP-
ING DIODES
VERYLOW QUIESCENTCURRENT
PLCC44 OR PQFP44(10 x 10mm)
DESCRIPTION
The L6451 is realized in Multipower BCD Technology which combines isolated DMOS power
transistors with CMOS and Bipolar circuits on the
same IC. By using mixed technology it has been
possible to optimize the logic circuitry and the
powerstage to achieve the best possible performances.
Intended to be used in ink jet Printer Applications
as 4 to 28 (2 x 14)lines selectable decoder/driver,
the L6451 device driver has the advantages of
low power CMOS inputs and logic, with 28 high
current and high voltage DMOS outputs capable
of sustaining a maximum of 40V.
On systempower up the output drivers are locked
out using the chip enable function; two enable inputs areavailable for the differentdriver banks.
MULTIPOWER BCD TECHNOLOGY
PQFP44 PLCC44
An internal power-on system is implemented in
order to avoid wrong output commutation during
the supply voltage transients.
Using a mask option during manufacturing allows
a differentdecoding.
Control of the energy delivered to the print head
ismade by means of a specialcircuitry.
All driver outputs are capable of withstanding a
contactdischargeof ±8kV with the ICbiased.
BLOCK DIAGRAM (case of 4 bit)
May 1995
This is advanced information on a new product now in developmentor undergoing evaluation. Details are subject to change without notice.
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L6451
PLCC44PIN CONNECTION (Top view)
PQFP44PIN CONNECTION (Top view)
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ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
V
CLAMP
I
I
PEAK
V
V
T
T
OUT
OUT
T
DD
IN
amb
stg
J
Output Voltage 40 V
Output Clamping Voltage 40 V
Output Continuous Current 0.8 A
Output Peak Current (with duty cycle = 10% TON=4µs) 2 A
JunctionTemperature 150 °C
LogicSupply Voltage 7 V
InputVoltage Range -0.3V to VS+0.3 V
Operating Temperature Range 0 to 70 °C
Storage Temperature Range -55 to 150 °C
PIN FUNCTIONS
Name Function
V
DD
GND Logic and Power Ground.
OUT0 to OUT27 DMOS Outputs.
CLAMP This pin has to be connected to the power supply voltage of the head resistors. Each ofthe
INA, INB, INC, IND Decoder inputs.
COM1, COM2 A low logic input on these pins enables the outputs selected by the decoder inputs.
CHIP ENABLE A logic high enable the chip.
5V Logic Supply.
output DMOS have their drain connected with the anode of a protection diode, all the cathodes
of the protection diodes are connected to the clamp pin. In order to have thedevice supplied,
the CLAMP pin needs to be connected to the power..
L6451
THERMAL DATA
Symbol Parameter PQFP44 PLCC44 Unit
R
th j-amb
(*) device mountedon PCB.
Thermal Resistance Junction-Ambient Max. 55 (*) 65 (*) °C/W
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