©2011 Device Engineering Inc. 1 of 16 DS-MW-01282-01 Rev. D
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FEATURES
Eight discrete inputs
o Individually configurable as either GND/OPEN or 28V/OPEN(GND) inputs.
o Input threshold and hysteresis per AirBus ABD0100H specification.
GND/OPEN mode: 4.5V/10.5V threshold, 3V hysteresis
28V/OPEN mode: 6V/12V threshold, 3V hysteresis
o 1mA input current to prevent dry relay contacts.
o Internal isolation diodes
o Inputs protected from Lightning Induced Transients per DO160F, Section 22, Cat A3 and B3
o Withstands inadvertent application of 115VAC/400Hz power
o Built-in Test (BIT) to test internal circuits including input comparator
Serial I/O interface to read data register and write configuration register
o Direct interface to Serial Peripheral Interface (SPI) port.
o TTL/CMOS compatible inputs and Tristate output
o 8.6MHz Max Data Rate
o Serial input to expand Shift Register
Logic Supply Voltage (VCC): 3.3V +/-5%
Analog Supply Voltage (VDD): 12V to 16.5V
16L SOIC EP package
PIN ASSIGNMENTS
DEI1282
1
DIN1
DIN2
DIN3
DIN4
VDD
GND
VCC
SEL
16
DIN5
DIN6
DIN7
DIN8
SDI
/CS
SDO
SCLK
Figure 1 DEI128 Pin Assignment (16 Lead SOIC)
385 East Alamo Drive
Chandler, AZ 85225
Phone: (480) 303-0822
Fax: (480) 303-0824
E-mail: admin@deiaz.com
DEI1282
8CH BIT PROGRAMMABLE
GND/OPN & 28V/OPN
DISCRETE INTERFACE IC
Device
Engineering
Incorporated
©2011 Device Engineering Inc. 2 of 16 DS-MW-01282-01 Rev. D
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FUNCTIONAL DESCRIPTION
DEI1282 is an eight-channel discrete-to digital interface IC implemented in a High Voltage Dielectric Isolated technology. It
senses eight discrete signals of the type commonly found in avionic systems and converts them to serial logic data. Each input
can be individually configured as either GND/OPEN or 28V/OPEN format input via a serial data input. The discrete data is
read from the device via an eight-bit serial shift register with 3-state output. This serial interface is compatible with the industry
standard Serial Peripheral Interface (SPI) bus.
The discrete inputs are implemented with High Voltage technology to provide immunity to Lightning Induced transients
(DO160F Level 3) without the need for additional protection components.
The on-chip Built-in Test (BIT) feature provides a Test Mode which provides a means to inject a test signal into each input
comparator without interfering with the discrete input signals. The test coverage includes each DIN comparator as well as the
digital logic and IO.
Table 1 Pin Descriptions
PINS NAME DESCRIPTION
1-8 DIN[1:8] Discrete Inputs. Eight discrete signals which can be individually
configured as either GND/OPEN or 28V/OPEN format inputs.
9 SDO Logic Output. Serial Data Output. This pin is the output from MSB (Bit
8) of the selected shift register (Data/Configuration). It is clocked by the
rising edge of SCLK. This is a 3-state output enabled by /CS.
10 SCLK Logic Input. Serial Shift Clock. A low-to-high transition on this input
shifts data on the serial data input into Bit 0 of the selected shift register.
The selected shift register is shifted from Bit 1 to Bit 8. Bit 8 of the
selected shift register is driven on SDO.
11 /CS Logic Input. Chip Select. A low level on this input enables the SDO 3-
state output and the selected shift register. A high level on this input
forces SDO to the high impedance state and disables the shift registers so
SCLK transitions have no effect. When the Data Register is selected, a
high-to-low transition causes the Discrete Input data to be loaded into the
Data Register. When the Configuration Register is selected, a low-to-
high transition causes the Serial Configuration Register data to be loaded
into the parallel configuration outputs.
12 SDI Logic Input. Serial Data Input. Data on this input is shifted into the LSB
(Bit 1) of the selected shift register on the rising edge of the SCLK when
/CS input is low.
13 SEL Logic Input. Selects between the Data Register and Configuration
Register. H = DATA, L = CONF.
14 VCC Logic Supply Voltage. 3.3V+/-5%
15 GND Logic/Signal Ground
16 VDD Analog Supply Voltage. 12V to 16.5V
DEI reserves the right to make changes to any products or specifications herein. DEI makes no warranty, representation, or
guarantee regarding suitability of its products for any particular purpose.
©2011 Device Engineering Inc. 3 of 16 DS-MW-01282-01 Rev. D
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Figure 2 Function Diagram
Figure 3 Discrete AFE Function Diagram
DISCRETE AFE
Channels 1 to 8
DIN[1:8]
CFG
_
SEL[1:8]
VDD VCC
GND
DOUT [1:8]
MUX
ENB
Control
Logic
SDO
SCLK
/ CS
SEL
SDI
DIN[ 1 :8 ]
DATA REG
8 bit Shift Registe
r
w
/
Parallel Input
SDI SDO
(D0)
SCK
SFT/LD PDI[1:8]
CONFIGURATION REG
9 bit Shift Registe
r
w
/
latched parallel output
SDI SDO
(D0)
SCK
SFT/LD
PDO[1:8] PDO[9]
TST_EN
10K
2K
20K
DIN
N
CFG_SEL
N
DOUTN
Vdd
Vdd
REFERENCE
SELECT
DPW
QNA
DN
100K
COMP
Vcc
+
-
100K
Vdd
TST_EN
Test Logic
DN
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Table 2 Truth Table
Serial Interface Operation
SEL /CS SCLK SDI DIN[1:8] SDO Description
X H X X X HI Z Not Selected
H L X Valid DIN[8] DR[1:8] DIN[1:8]
H L DR[1] X DR[8] DR[n+1] DR[n], DR[1] SDI
L L CR[1] X CR[8] CR[n+1] CR[n], CR[1] SDI
L L X X HI Z CL[1:8] CR[1:8]
Legend:
DR = Data Register
CR = Configuration Register
CL = Configuration Latch
X = Don’t Care
DIN [1:8] Discrete AFE
The Discrete Input Analog Front End circuit function is represented in Figure 3. Each DINn signal is conditioned by the
resistor / diode network and presented to a comparator with hysteresis. When the input is configured for GND/OPEN
operation, the pull-up resistor and diode are enabled and comparator threshold voltage is selected. When the input is
configured for 28V/OPEN operation, the pull-down resistor is enabled and the comparator is appropriately configured. Prior to
configuration (after power up), neither pull-up nor pull-down is enabled and the AFE presents a high impedance (Hi-Z).
Some notable features are:
The input threshold voltage and hysteresis:
o 28V/OPEN
Low-to-high threshold voltage: 12V > Vth > 10.5V.
High-to-low threshold voltage: 6V < Vth < 7.5V.
Hysteresis: Vhys > 3V.
o GND/OPEN
Low-to-high threshold voltage: 10.5V > Vth > 9V.
High-to-low threshold voltage: 4.5V < Vth < 6V.
Hysteresis: Vhys > 3V.
The input current is ~ 1mA. This current will prevent a “dry” relay contact.
Input noise immunity is maximized with a combination of voltage hysteresis and use of a slow input voltage
comparator
The inputs can withstand continuous input voltages of 49V, lightning transient voltages per DO160 Level 3 pin
injection tests, and survive inadvertent application of 115VAC/400Hz.
Data Register
The 8-bit Data Register is a “parallel-input, serial-output” register that samples the input channels and reads-out the data to the
Serial Data Output. The register is read via the SDO output as described in Figure 4 and Figure 5. A low DIN input level
results in a Logic 0, and a high input level results in a Logic 1.
Configuration Register
The 9-bit Configuration Register (CR) is a “serial-input, parallel-output with data latch” register that individually configures
each AFE input as either GND/OPEN or 28V/OPEN format. (CR[n]: 0 sets DIN[n] to 28V/OPEN mode (pull-down); CR[n]: 1
sets DIN[n] to GND/OPEN mode (pull-up)). The register is reset to 0’s at Power Up and the AFE inputs are forced in to high
impedance mode until the CR is programmed. (see Power Up Initialization). Bit 9 is used to enable or disable Built-in Test (see
BIT Operation). The register is programmed via the serial data input as described in Figure 6 and Figure 7.
Serial Interface
The DEI1282 incorporates a serial IO interface for programming the Discrete Input configuration and for reading the Discrete
Input status. Refer to
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Figure 2. The interface is SPI compatible and consists of /CS, SEL, SCLK, SDO, and SDI signals. Figures 4 – 7 depict the
Data Read sequence and Configuration Write sequence for both a single device and dual “daisy chained” devices; refer to
Figure 16 for connection details.
Power Up Initialization
The DEI1282 incorporates an on-chip power-up reset (POR) circuit and logic to force the DIN inputs to a high impedance state
at power up; the AFE pull-up and pull-down circuits are disabled. POR monitors the VCC logic supply and forces the AFE to
the high impedance state while VCC is stabilizing. It remains high impedance until the Configuration Register is programmed
by the first Write Configuration Register cycle when the pull-up or pull-down state is defined.
The POR rising Vcc threshold is ~2.5V with ~0.4V of hysteresis. The POR includes a ~200us delay from the Vcc threshold to
reset output; the Configuration Register ignores attempts to program it during this POR delay time.
The POR will reset when there is sufficient voltage sag on Vcc. When VCC drops below ~2.0V for ~9us, POR will activate,
the Configuration and Data Registers will reset to “0”, and the AFEs (DIN’s) are set to Hi-Z.
BIT Operation
Bit 9 of the Configuration Register (CR) is used to enable or disable Built-in Test (1 = BIT enabled, 0 = Normal). When BIT is
enabled, each channel configuration bit value is used to drive a test stimulus on the respective channel comparator (see Figure
3). Thus all channels can be tested by setting the BIT mode, programming test stimulus patterns into the CR, and reading the
results from the DR. The DIN inputs are placed in Hi-Impedance mode (pull up and pull down switches are OFF) during test
mode, so the test does not interfere with the DIN signals. The BIT test stimulus is isolated from the DIN pin by 100K.
/CS
SCLK
SDO
SDI X
X
X
X
DIN1DIN2
DIN3
DIN4DIN5DIN6DIN7DIN8
DIN inputs latched into DATA S-Reg
XX
VALID
DIN[1:8]
SEL
Figure 4 Read Data Register
/CS
SCLK
SDO
SDI SI8 SI7 SI6 SI5 SI4 SI3 SI2 SI1 X
X
X
X
DIN1DIN2DIN3DIN4DIN5DIN6DIN7DIN8 SI1SI2SI3SI4SI5SI6Si7SI8
XX
VALID
DIN[1:8]
SEL
DIN inputs latched into DATA S-Reg SDI data shifted to SDO after 8 bit delay
Figure 5 Read Data Register, 16 Bit Daisy Chain (See Figure 16)
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Figure 6 Write Configuration Register
Figure 7 Write Configuration Register, 18 bit Daisy Chain (See Figure 16)
/ CS
SCL
K
SDO
SDI
X
X
PCD
2
PCD
3
PCD
4
PCD
5
PCD
6
PCD
7
PCD
8
PCD
9
DIN[ 1 :8 ]
SEL
X
NCD
8 NCD
7
NCD
6
NCD
5
NCD
4
NCD
3
NCD
2
NCD
9
X X
PCD
1
PDO[ 1 : 9 ]
Internal Config Latch Present Configuration New
Configuration
NCDn = New Configuration Data Bits
PCDn = Present Configuration Data Bits
NCD
1
NCD
9
/CS
SCLK
SDO
SDI
X
X
PCD
2
PCD
3
PCD
4
PCD
5
PCD
6
PCD
7
PCD
8
PCD
9 DCD
3
DCD
4
DCD
5
DCD
6
DCD
7
DCD
8
DCD
9
DCD
2
X
DIN [1:8]
SEL
DCD
8 DCD
7
DCD
6
DCD
5 DCD
4 DCD
3
DCD
2
DCD
9
XNCD
9
NCD
8
NCD
7
NCD
6
NCD
5
NCD
4
NCD
3 X
DCDn = Daisy Chain Data Bits
NCDn = New Configuration Data Bits
PCDn = Present Configuration Data Bits
PDO[1:8]
Internal
Config
Latch
Present Configuration New
Configuration
NCD
1
DCD
1
NCD
2 NCD
1
DCD
1
PCD
9
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LIGHTNING TRANSIENT IMMUNITY
The DIN inputs are designed to survive lightning induced transients as defined by RTCA DO160F, Section 22, Cat A3 and B3,
Waveforms 3, 4 and 5A, Level 3. Contact factory for lightning test report.
Figure 8 Voltage / Current Waveform 3 Figure 9 Voltage Waveform 4
Waveform Source Impedance characteristics:
Waveform 3 Voc/Isc = 600V / 24A => 25
Waveform 4 Voc/Isc = 300 V / 60 A => 5
Waveform 5A Voc / Isc = 300V / 300A => 1
Waveform 5A Voc / Isc = 500V / 500A => 1
Figure 10 Voltage / Current Waveform 5A
INADVERTANT SHORT TO 115VAC POWER
The DIN inputs are able to withstand inadvertent shorts to 115VAC/400Hz aircraft power.
Contact factory for test report.
t
0
50%
Peak
T1 T2
V
T1 = 6.4us
T2 = 70us
t
0
50%
Peak
T1 T2
V/I
T1=40us
T2=120us
0t
V/I
25% to 75%
of Largest Peak
50%
F = 1MHZ and 10MHZ
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ELECTRICAL DESCRIPTION
Table 3 Absolute Maximum Ratings
PARAMETER MIN MAX UNITS
VCC Supply Voltage -0.3 +5.0 V
VDD Supply Voltage -0.3 18 V
Operating Temperature
Exposed pad soldered to heat sink
-55
+125
°C
Storage Temperature
Plastic Package
-55
+150
°C
Input Voltage
DIN[1:8] Continuous
DO160F, Waveform 3, Level 3
DO160F, Waveform 4 and 5, Level 3
DO160F, Abnormal Surge Voltage, 100ms
Logic Inputs
DOUT
-10
-600
-300
-1.5
-0.5
+49
+600
+300
80
VCC + 1.5
VCC + 0.5
Vdc
Vpk
Vpk
Vpk
V
V
Power Dissipation @ 125°C, Steady state
16L SOIC
0.63
W
Junction Temperature:
Tjmax, Plastic Packages
150
°C
ESD per JEDEC A114-A Human Body Model
Logic and Supply pins
DIN pins
2000
1000
V
V
Peak Body Temperature (10 sec duration) 260 °C
N
otes:
1. Stresses above absolute maximum ratings may cause permanent damage to the device.
2. Voltages referenced to Ground
Table 4 Recommended Operating Conditions
PARAMETER SYMBOL CONDITIONS
Supply Voltage VCC
VDD
3.3V±5%
12V to 16.5V
Logic Inputs and Outputs 0 to VCC
Discrete Inputs DIN[1:8] 0 to 49V
Operating Temperature
Plastic Ta
-55ºC to 125ºC
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Table 5 DC Electrical Characteristics
SYMBOL PARAMETER CONDITIONS (1) MIN
LIMIT
NOM MAX
LIMIT
UNIT
Logic Inputs/Outputs
VIH HI level input voltage VCC = 3.3V 2.0 V
VIL LO level input voltage VCC = 3.3V 0.8 V
VIhst Input hysteresis voltage,
SCLK input (3) 50 mV
IOUT = -20uA
VCC – 0.1
V
VOH HI level output voltage
IOUT = -4mA, VCC = 3V 2.4 V
IOUT = 20uA 0.1 V
VOL LO level output voltage IOUT = 4mA, VCC = 3V 0.4 V
IIN Input leakage VIN = VCC or GND -10 10 uA
IOZ 3-state leakage current Output in Hi Impedance state.
VOUT = VIHmin, VILmax -10 10 uA
Discrete Inputs, Configured as Ground/Open (internal pull-up)
VIH HI level input voltage 10.5 49 V
VTLH Input threshold, LO to HI 9.0 10.5 V
RIH HI level Din-to-GND
resistance
Resistor from DIN to GND to
guarantee HI input condition. 50K
IIH HI level input current VIN = 28V, VDD = 15V
VIN = 49V, VDD = 15V
17
45
100
250
uA
uA
VIL LO level input voltage -4.0 4.5 V
VTHL Input threshold, HI to LO 4.5 6.0 V
RIL LO level Din-to-GND
resistance
Resistor from DIN to GND to
guarantee LO input condition.
500
IIL LO level input current VIN = 0V, VDD = 15V -0.8 -1.0 -1.8 mA
VIhst Input hysteresis voltage 3 V
Discrete Inputs, Configured as 28V/Open (internal pull-down)
VIH HI level input voltage 12.0 49 V
VTLH Input threshold, LO to HI 10.5 12 V
IIH HI level input current VIN = 28V, VDD = 15V 0.6 0.8 1.35 mA
VIL LO level input voltage -4 6.0 V
VTHL Input threshold, HI to LO 6.0 7.5 V
IIL LO level input current VIN = 1V, VDD = 15V 50 uA
VIhst Input hysteresis voltage 3 V
Power Supply
ICC Max quiescent logic
supply current
VIN(logic) = VCC or GND
VIN[1:8] = open
1.8
3
mA
IDD Max quiescent analog
supply current
VIN(logic) = VCC or GND
Ground/Open Mode,
VIN[1:8] = Open
VIN[1:8] = GND
15
22
24
33
mA
Notes:
1. Ta = -55ºC to 125ºC., VDD = 12V to 16.5V, VCC = 3.3V+/-5% unless otherwise noted. For worst test condition,
VCC=3V is used for convenient.
2. Current flowing into device is ‘+’. Current flowing out of device is ‘-‘. Voltages are referenced to Ground.
3. Guaranteed by design. Not production tested.
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Table 6 AC Electrical Characteristics
SYMBOL PARAMETER CONDITIONS (6,7) MIN
LIMIT
MAX
LIMIT UNIT
fMAX SCLK frequency. 50% duty cycle (5) 0.1 8.6 MHz
tW SCLK pulse width. (5) 50 ns
tsu1 Setup time, SCLK low to /CS. 30 ns
th1 Hold time, /CS to SCLK. 25 ns
tsu2 Setup time, DIN valid to /CS. (5) 500 ns
th2 Hold time, /CS to DIN not valid. 15 us
tsu3 Setup time, SDIN valid to SCLK. 25 ns
th3 Hold time, SCLK to SDIN not valid. 25 ns
tsu4 Setup time, SEL valid to /CS. 30 ns
th4 Hold time, SEL valid to /CS. 25 ns
tp1 Propagation delay, /CS to DOUT valid. (1) 105 ns
tp2 Propagation delay, SCLK to DOUT valid. (1) 90 ns
tp3 Propagation delay, /CS to DOUT HI-Z. (1) (2) (3) 80 ns
tp4 Delay time between /CS active. (5) 20 ns
Cin Maximum logic input pin Capacitance. (5) 10 pF
Cout Maximum SDO pin capacitance, output in HI-Z state. (5) 15 pF
Notes:
1. SDO loaded with 50pF to GND.
2. SDO loaded with 1K to GND for Hi output, 1K to VCC for Low output.
3. Timing measured at 25%VCC for “0” to Hi-Z, 75%VCC for “1” to Hi-Z.
4. Sample tested on lot basis.
5. Guaranteed by design. Not production tested.
6. Ta = -55ºC to 85 or 125ºC, VCC = 3V, VDD = 15V, VIL = 0V, VIH = VCC unless otherwise noted.
7. Measurements made at 50%VCC.
8. Guaranteed by design. Not production tested.
/CS
SCLK
SDO
SDI
DIN[1:8]
tsu1
th1
tW
1/fmax
tsu2 th2
XX
valid
tsu3
th3
XX
D/C0 D/C1
tp1
tp2
tp3
tp4
valid
SEL
tsu4
th4
Figure 11 Switching Waveforms
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APPLICATION INFORMATION
Discrete Input Filtering
The DEI1282 Analog Front End provides a moderate level of noise immunity via a combination hysteresis and limited
bandwidth. The Hysteresis is 3V minimum and the comparator bandwidth is approximately 10MHz.
Many applications provide additional noise immunity by means of debounce/filtering in software or in digital circuitry (i.e.:
FPGA). Common input debounce techniques are readily found with a web search of the term “software debounce” and range
from simple detectors of two or more sequential stable readings to FIR filters emulating RC time constants.
Input Current Characteristics
Figures 12-15 depicts the DIN Input Current vs. Voltage characteristics for the various operating and non-operating modes.
Measurements are at Room temperature.
Figure 12 28V/Open Mode Input IV Characteristics (VDD = 15V)
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Figure 13 GND/OPEN Mode Input IV Characteristics (VDD = 15V)
Figure 14 Hi-Z (Unconfigured and BIT) Mode Input IV Characteristics (VDD = 15V)
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Figure 15 VDD = VCC= GND and VDD = VCC = Open Input IV Characteristics
Daisy Chain Connection
Multiple DEI1282 ICs can be connected as daisy chain. Figure 16 shows three DEI1282 in series. The critical timing is Tsu3
(see Fig 11), minimum SDIN valid to SCLK setup time.
Figure 16 Example connection of 3 DEI1282 connected as daisy chain
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Package Power Dissipation
The DEI1282 power dissipation varies with channel configuration and operating conditions. Figure 17 shows the device
package power dissipation for various conditions. This includes the contributions from Supply currents and Input currents.
The four curves are as follows:
Table 7 Legend for Power Dissipation Curves
CURVE ID SUPPLY VOLTAGE, TEMPERATURE,
IC VARIATION
+28V/OPEN-Nom
3.3V, 12V / 27ºC / typical IC parameters
+28V/OPEN-Wst
3.3V, 16.5V / 125ºC /
Worst case IC parameters
GND/OPEN-Nom
3.3V, 12V / 27ºC / typical IC parameters
GND/OPEN-Wst
3.3V, 16.5V / 125ºC /
Worst case IC parameters
DEI1282 Power Dissipation Graph
0
100
200
300
400
500
600
700
800
012345678
Number Channels Active
Power Dissipation (mW)
+28V/OPN-Nom
+28V/OPN-Wst
GND/OPN-Nom
GND/OPN-Wst
Notes: The active channels are forced to Ground for GND/OPN type and forced to 28V for 28V/OPN type.
Figure 17 Power Dissipation for Various Conditions
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PACKAGE DESCRIPTION - 16L Narrow Body EP SOIC
Table 8 Package Information
Package Type Package Ref Θjc/ Θja
(°C/W)
/1
JEDEC
Moisture
Sensitivity
Level
Lead Finish /
JEDEC Pb-Free
Code
Pb Free
Designation
JEDEC
MO
16L SOIC NB SnPb 16 EP SOICN ~10 / ~40 MSL 1 / 260°C 85/15 SnPb plate
na
Not Pb-free MS-012-
AC
16L SOIC NB
Matte Sn RoHS
16 EP SOICN G ~10 / ~40 MSL 1 / 260°C 100% Matte Sn
e3
RoHS MS-012-
AC
Notes:
1. Mounted on 4 layer PCB with exposed pad soldered to PCB land with thermal VIAs to internal GND plane
The PCB design and layout is a significant factor in determining thermal resistance (Θja) of the IC package. Use maximum
trace width on all power and signal connections at the IC; these traces serve as heat spreaders which improve heat flow from
the IC leads.
The exposed pad on the bottom of the SOIC package must be soldered to a heat-spreader land pattern on the PCB. The IC
exposed pad is electrically isolated, but must be connected to some potential on the PCB, typically Ground or Vcc . Maximize
the PCB land size by extending it beyond the IC outline if possible. A grid of thermal VIAs, which drop down and connect to
the buried copper plane(s), should be placed under the heat-spreader land. A typical VIA grid is 12mil plated holes on a 50mil
pitch. Use as many VIAs as space allows. VIAs should be plugged to prevent voids being formed between the exposed pad
and PCB heat-spreader land due to solder escaping by the capillary effect. Wicking can be avoided by tenting the VIAs with
solder mask.
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Note: The bottom thermal contact (exposed pad) is electrically isolated.
Figure 18 16 Lead Narrow Body EP SOIC Outline
ORDERING INFORMATION
Table 9 Ordering Information
Part Number Marking Package (1) Burn In Temperature
DEI1282-SES DEI1282-SES 16 EP SOIC No -55ºC / 85ºC
DEI1282-SMS DEI1282-SMS 16 EP SOIC No -55ºC / 125ºC
DEI1282-SES-G DEI1282-SES-G / e3 16 EP SOIC G No -55ºC / 85ºC
DEI1282-SMS-G DEI1282-SMS-G / e3 16 EP SOIC G No -55ºC / 125ºC
Notes:
1. Refer to Table 8