A6817: Addressable 28-Line Decoder/Driver

Data Sheet
26186.22*
6817
IN A (LSB)
OUTPUT ENABLE A
41
40
IN B
GND
43
42
IN D (MSB)
IN C
44
LOGIC SUPPLY
2
1
3
V
DD
OUTPUT ENABLE B
GND
4
OUT B0
CHIP ENABLE
6
5
ADDRESSABLE
28-LINE DECODER/DRIVER
39
OUTA0
8
38
OUTA1
OUTB3
9
37
OUTA2
OUTB4
10
36
OUTA3
OUTB5
11
35
OUTA4
OUTB6
12
34
OUTA5
OUTB7
13
33
OUTA6
OUTB8
14
32
OUTA7
OUTB9
15
31
OUTA8
GND
16
30
OUTA9
IC
17
29
GND
28
27
OUT
NC
OUTA11
A10
25
26
OUTA12
24
A13
OUT
23
22
OUT
B12
OUTB13
21
20
OUTB11
19
OUTB10
18
IC
IC
4-TO-14 LINE DECODER
OUTPUT DRIVER BANK A
7
OUTB2
OUTPUT DRIVER BANK B
OUTB1
Dwg. PP-050
Intended for use in ink-jet printer applications, the A6817SEP
addressable 28-line decoder/driver combines low-power CMOS inputs
and logic with 28 high-current, high-voltage bipolar outputs. A 4-to-14
line decoder determines the selected output driver (n) in each
14-driver bank. Two independent output-enable inputs (active low)
then provide the final decoding to activate 1- or 2-of-28 outputs
(OUTAn and/or OUTBn). Special internal circuitry is programmed at the
time of manufacture to adjust the output pulse timing and thereby the
energy the device delivers to the ink-jet print head. The DABiC-IV
A6817SEP directly replaces the original BiMOS-II A5817SEP in most
applications.
T
C
U
D
The CMOS inputs cause minimal loading and are compatible with
standard CMOS, PMOS, and NMOS logic. Use with TTL or DTL
circuits may require appropriate pull-up resistors to ensure an input
logic high. The internal CMOS logic operates from a 5 V supply.
A CHIP ENABLE function is provided to lock out the drivers during
system power up. The 28 bipolar power outputs are open-collector
30 V Darlington drivers capable of sinking 500 mA at ambient
temperatures up to 85°C.
O
y
R
l
P n
O
D
E ce
The A6817SEP is furnished in a 44-lead plastic chip carrier
(quad pack) for minimum-area, surface-mount applications.
U
n
IN re
e
T
f
N Re
FEATURES
ABSOLUTE MAXIMUM RATINGS
at TA = 25°C
O
C or
Output Voltage, VCE ............................. 30 V
Logic Supply Voltage, VDD .................. 7.0 V
Input Voltage Range,
VIN ....................... -0.3 V to VDD + 0.3 V
Output Current, IC ........................... 600 mA
Package Power Dissipation, PD ..... 2.70 W*
Operating Temperature Range,
TA ................................. -20°C to +85°C
Storage Temperature Range,
TS .............................. -55°C to +150°C
S
I
D
F
■ Controlled Characteristics for Ink-Jet Printers
■ Addressable Data Entry
■ 30 V Minimum V(BR)CEX
■ CMOS, PMOS, NMOS Compatible Inputs
■ Low-Power CMOS Logic
*Derate at rate of 22 mW/°C above TA = 25°C.
Caution: These CMOS devices have input static
protection (Class 2) but are still susceptible to
damage when exposed to extremely high static
electrical charges.
Always order by complete part number: A6817SEP .
6817
ADDRESSABLE
28-LINE
DECODER/DRIVER
OUTPUT ENABLE B
OUT B12
OUT B11
B2
OUT
OUT B1
B0
OUT
OUTB13
TURN-ON
DELAY
IN D (MSB)
IN C
IN B
OUT A13
OUT A12
OUTA11
OUT
A2
4-TO-14 LINE DECODER
OUT A1
OUT
A0
TURN-ON
DELAY
IN A (LSB)
CHIP ENABLE
LOGIC SUPPLY
OUTPUT ENABLE A
FUNCTIONAL BLOCK DIAGRAM
Dwg. FP-032
TYPICAL INPUT CIRCUIT
TYPICAL OUTPUT DRIVER
VDD
OUTN
IN
Dwg. EP-021-7
Dwg. EP-010-1
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
W
Copyright © 1997, 2003 Allegro MicroSystems, Inc.
6817
ADDRESSABLE
28-LINE
DECODER/DRIVER
ELECTRICAL CHARACTERISTICS at TA = +25°C, VDD = 5.0 V.
Limits
Characteristic
Symbol
Test Conditions
Min
Typ
Max
Units
—
<1.0
100
µA
IOUT = 450 mA
0.80
1.10
1.40
V
IOUT = 400 mA
0.75
1.05
1.35
V
30
—
—
V
Output Drivers
Output Leakage Current
Output Saturation Voltage
Output Breakdown Voltage
Unclamped Inductive
Load Current
Turn-On Time
Fall Time
Turn-Off Time
Rise Time
ICEX
VCE(SAT)
V(BR)CEX
—
VCE = 30 V
RL = 56 Ω
VCC = 30 V, L = 3 µH, RL = 56 Ω,
IL = 500 mA, Test Fig.
See Note
—
tPHL
VCC = 21 V, RL = 39 Ω
25
100
425
ns
tf
VCC = 21 V, RL = 39 Ω
—
20
—
ns
tPLH
VCC = 21 V, RL = 39 Ω
50
125
350
ns
tr
VCC = 21 V, RL = 39 Ω
—
50
—
ns
VIN(1)
3.5
—
—
V
VIN(0)
—
—
0.8
V
Control Logic
Logic Input Voltage
Logic Input Current
Input Resistance
Supply Current
IIN(1)
VIN = 5.0 V
—
<1.0
100
µA
IIN(0)
VIN = 0 V
—
<-1.0
-100
µA
50
—
—
kΩ
RIN
IDD(ON)
Two Outputs ON
—
6.0
10.0
mA
IDD(OFF)
All Drivers OFF, All Inputs = 0 V,
OEA = OEB = VDD
—
—
600
µA
Note: Device will turn off and meet all specifications after test.
www.allegromicro.com
6817
ADDRESSABLE
28-LINE
DECODER/DRIVER
OUTN
L
R
V CC
IL
Dwg. EP-044
UNCLAMPED INDUCTIVE LOAD CURRENT TEST FIGURE
A
B
INA-D
t ENABLE
OUTPUT ENABLE
(A and/or B)
t PHL
t OUT
90%
OUTPUT VOLTAGE N
t PLH
90%
50%
50%
10%
10%
tf
tr
Dwg. WP-017
TIMING CONDITIONS
(Logic Levels are VDD and Ground)
A. Minimum Data Active Time Before Output Enable (Data Set-Up Time) ............ 150 ns
B. Minimum Data Hold Time After Output Enable (Data Hold Time) ..................... 250 ns
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
6817
ADDRESSABLE
28-LINE
DECODER/DRIVER
APPLICATIONS INFORMATION
This device is intended specifically for, although
certainly not limited to, driving ink-jet print heads. In
this application, a certain minimum energy (a function
of load voltage and output pulse duration) is required
for proper operation, while excessive energy will
degrade the life of the print head. The output pulse
duration (tOUT) is equal to tENABLE + tPLH – tPHL, where
tPHL is adjusted during manufacture to compensate for
variations in the output saturation voltage (VCE(SAT)).
For the A6817SEP, the relationship between tOUT
and tENABLE at TA = 25°C is:
tOUT = tENABLE ([VCE(SAT)(actual) – VCE(SAT)(typical)]
x 330 ns) + 25 ns + 110 ns.
For most applications, this will result in a drivercontribution-to-energy-error of less than ±4%.
A logic low on the CHIP ENABLE input will
prevent the drivers from turning ON, regardless of the
state of other inputs or the logic supply voltage. The
CHIP ENABLE input has a slow response time and
should not be used as a high-speed control line. For
proper operation, all ground terminals should be
connected to a common ground on the printed wiring
board. The IC (Internal Connection) terminals are
used to program the turn-on time of the device and
MUST be left electrically unconnected (floating) for
proper operation.
DECODER TRUTH TABLE
IND
(MSB)
INC
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
INB
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
INA
(LSB)
N
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
ALL OFF
ALL OFF
Depending on the four address inputs, the 4-to-14 line
decoder selects one driver from each of the 14 output A
and B banks of sink drivers according to the Decoder
Truth Table. The state of the selected outputs is determined by the OUTPUT ENABLE inputs as shown in the
Enable Truth Table.
ENABLE TRUTH TABLE
CHIP
ENABLE
OUTPUT
ENABLEA
OUTPUT
ENABLEB
0
X
X
ALL OFF
1
1
1
ALL OFF
1
0
1
OUTAN ON
1
1
0
OUTBN ON
1
0
0
OUTAN ON, OUTBN ON
X = Irrelevant
www.allegromicro.com
OUTPUTS (OFF unless otherwise specified.
For the value of N see the Decoder Truth Table)
6817
ADDRESSABLE
28-LINE
DECODER/DRIVER
Dimensions in Inches
(for reference only)
18
28
29
17
0.032
0.026
0.319
0.291
0.695
0.685
0.021
0.013
0.656
0.650
INDEX AREA
0.319
0.291
0.050
BSC
39
7
40
0.020
44
1
2
6
0.656
0.650
MIN
0.695
0.685
0.180
0.165
Dwg. MA-005-44A in
Dimensions in Millimeters
(controlling dimensions)
28
18
29
17
0.812
0.661
8.10
7.39
17.65
17.40
0.533
0.331
16.662
16.510
INDEX AREA
8.10
7.39
1.27
BSC
39
7
40
0.51
MIN
4.57
4.20
44
1
2
6
16.662
16.510
17.65
17.40
Dwg. MA-005-44A mm
NOTES:
1. Exact body and lead configuration at vendor’s option within limits shown.
2. Lead spacing tolerance is non-cumulative.
3. Supplied in standard sticks/tubes of 27 devices or add “TR” to part number for tape and reel.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
6817
ADDRESSABLE
28-LINE
DECODER/DRIVER
The products described here are manufactured under one or more
U.S. patents or U.S. patents pending.
Allegro MicroSystems, Inc. reserves the right to make, from time to
time, such departures from the detail specifications as may be required
to permit improvements in the performance, reliability, or
manufacturability of its products. Before placing an order, the user is
cautioned to verify that the information being relied upon is current.
Allegro products are not authorized for use as critical components
in life-support devices or systems without express written approval.
The information included herein is believed to be accurate and
reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringement of patents or other rights of
third parties which may result from its use.
www.allegromicro.com
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