EDGE749 [SEMTECH]
Octal Pin Electronics Driver/Receiver; 八引脚电子驱动器/接收器型号: | EDGE749 |
厂家: | SEMTECH CORPORATION |
描述: | Octal Pin Electronics Driver/Receiver |
文件: | 总14页 (文件大小:105K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
Edge749
Octal Pin Electronics
Driver/Receiver
EDGE HIGH-PERFORMANCE PRODUCTS
Features
Description
The Edge749 is an octal pin electronics driver and
receiver combination fabricated in a high-performance
CMOS process. It is designed for automatic test
equipment and instrumentation where cost, functional
density, and power are all at a premium.
• 20 MHz Operation
• 18 V DUT I/O Range
• Programmable Output Levels
• Programmable Input Thresholds
• Per Pin Flexibility
• High Integration Levels
• Low Power Dissipation
• Edge 648 and 649 Compatible
The Edge749 incorporates eight channels of
programmable drivers and receivers into one package.
Each channel has per pin driver levels, receiver threshold,
and tristate control.
The 18V driver output and receiver input range allows
the Edge749 to interface directly between TTL, ECL,
CMOS (3V, 5V, and 8V), very high voltage, and custom
level circuitry.
Applications
• Burn-In ATE
• Functional Board Testers
• In-Circuit Board Testers
• Combinational Board Testers
• Low Cost Chip Testers
• ASIC Verifiers
The Edge749 is pin and functionally compatible with the
Edge648 and Edge649.
• VXI-Based Test Equipment
Functional Block Diagram
V
HIGH
V
LOW
8
8
8
8
8
DATA IN
DVR EN*
8
8
DUT
+
DATA OUT
–
THRESHOLD
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Revision 1/ June 23, 1998
1
Edge749
EDGE HIGH-PERFORMANCE PRODUCTS
PIN Description
Pin Name
Pin Number
Description
DATA IN (0:7)
64, 65, 66, 67,
3, 4, 5, 6
TTL compatible inputs that determine the high/low status of the DUT
drivers.
DATA OUT (0:7)
DUT (0:7)
56, 57, 58, 59,
11, 12, 13, 14
CMOS level outputs that indicate the status of the DUT receivers.
Pin electronic inputs/outputs that receive/drive the device under test.
46, 43, 40, 37,
33, 30, 27, 24
DVR EN (0:7)
VHIGH (0:7)
60, 61, 62, 63,
7, 8, 9, 10
TTl compatible inputs that control the high impedance state of the
DUT drivers.
45, 44, 39, 38,
32, 31, 26, 25
Unbuffered analog inputs that set the voltage level of a logical 1 of the
DUT drivers.
VLOW (0:7)
44, 42, 41, 36,
34, 29, 28, 23
Unbuffered analog inputs that set the voltage level of a logical 0 of the
DUT drivers.
THRESHOLD (0:7)
50, 51, 52, 53,
17, 18, 19, 20
Buffered analog input voltage that sets the threshold for the DUT
comparators.
VCC
VEE
21, 49
22, 48
Analog positive power supply.
Analog negative power supply.
VDD
GND
N/C
1, 15, 55
2, 16, 54, 68
35
Digital power supply.
Device ground.
No connection.
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2000 Semtech Corp.
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Edge749
EDGE HIGH-PERFORMANCE PRODUCTS
PIN Description (continued)
61
62
63
64
65
66
67
68
1
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
DVR EN*1
DVR EN*2
DVR EN*3
DATA IN0
DATA IN1
DATA IN2
DATA IN3
GND
DUT1
VLOW1
VLOW2
DUT2
VHIGH2
VHIGH3
DUT3
VLOW3
NC
VDD
2
GND
VLOW4
DUT4
3
DATA IN4
DATA IN5
DATA IN6
DATA IN7
DVR EN*4
DVR EN*5
DVR EN*6
4
VHIGH4
VHIGH5
DUT5
5
6
7
VLOW5
VLOW6
DUT6
8
9
2000 Semtech Corp.
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Edge749
EDGE HIGH-PERFORMANCE PRODUCTS
Circuit Description
Driver Description
V
and V
HIGH LOW
V
HIGH
V
LOW
VHIGH and VLOW define the logical “1” and “0” levels of
the DUT driver and can be adjusted anywhere over the
range determined by VCC and VEE. Table 1 documents
the relationship between the analog power to supplies
(VCC and VEE), the driver range (VHIGH and VLOW), and
the comparator threshold range (VTHRESHOLD).
DATA IN
DUT
The VHIGH and VLOW inputs are unbuffered in that they
also provide the driver output current (see Figure 3), so
the source of VHIGH and VLOW must have ample current
drive capability.
DVR EN*
Figure 1. Driver Diagram
V
As shown in Figure 1, Edge749 supports programmable
high and low levels and tristate per channel. There are
no shared lines between any drivers. The DVR EN* and
DATA IN signals are TTL compatible inputs that control
the driver (see Figure 2).
HIGH
With DVR EN* high, the DUT driver goes into a high
impedance state. With DVR EN* low, DATA IN high forces
the driver into a high state (DUT = VHIGH), and DATA IN
low forces the driver low (DUT = VLOW).
DUT
DVR EN*
DATA IN
V
LOW
Figure 3.
Simplified Model of the
Unbuffered Output Stage
V
V
HIGH
DUT
LOW
Figure 2. Driver Functionality
Drive
Receive
Common Mode Range
Threshold
Range
Common Mode Range
VEE <= DUT <= VCC
VEE <= DUT <= VCC
VEE + 3V <= THRESHOLD <= VOC - 3V
Table 1. Headroom vs. Power Supplies
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2000 Semtech Corp.
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Edge749
EDGE HIGH-PERFORMANCE PRODUCTS
Circuit Description (continued)
Driver Output Protection
In a functional testing environment, where a resistor is
added in series with the driver output (to create a 50Ω
output impedance), the Edge749 can withstand a short
to any legal DUT voltage for an indefinite amount of time.
In a low impedance application with no additional output
series resistance, care must be exercised and systems
should be designed to check for this condition and tristate
the driver if a short is detected.
Receiver Functionality
Edge749 supports programmable thresholds per
channel. There are no shared lines between comparators.
THRESHOLD is a high input impedance analog input
which defines a logical “1” and “0” at the DUT (see
Figure 4). If the DUT voltage is more positive than
THRESHOLD, DATA OUT will be high. With DUT lower
than THRESHOLD, DATA OUT will be low.
+
–
DUT
DATA OUT
THRESHOLD
THRESHOLD
DUT
DATA OUT
Tpd
Figure 4. Receiver Functionality
2000 Semtech Corp.
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Edge749
EDGE HIGH-PERFORMANCE PRODUCTS
Application Information
Power Supplies
VCC and VEE, which power the DUT drivers and receivers,
should also be decoupled to GND with a .1 µF chip
capacitor in parallel with a .001 µF chip capacitor. A
VCC and VEE plane, or at least a solid power bus, is
recommended for optimal performance.
The Edge749 uses three power supplies – VDD, VCC
and VEE. VDD, typically +5V, is the digital supply for all
of the data inputs and outputs. VCC and VEE are the
analog power supplies for the DUT drivers and
comparators. VCC can range from +10V to +18V, and
must be greater than or equal to VDD. VEE is the negative
analog power and may vary from 0V to –3V.
V
and V
Decoupling
LOW
HIGH
The Edge749 has several power supply requirements to
protect the part in power supply fault situations, as well
as during power up and power down sequences. VCC
must remain greater than or equal to VDD at all times.
Both VCC and VDD must always be positive (above
ground), and VEE must always be negative (at or below
ground).
As the VHIGH and VLOW inputs are unbuffered and must
supply the driver output current, decoupling capacitors
for these inputs are recommended in proportion to the
amount of output current the application requires.
Expanding the Common Mode Range
The three-Schottky diode configuration shown in Figure
5, used on a once-per-board basis, insures power supply
sequence and fault tolerance.
Although the Edge749 can drive and receive 18 V swings,
these 18 V signals can be adjusted over an 21 V range.
By using programmable regulators V1 and V2 for the
VCC and VEE supplies (feasible because these two
analog power supplies do not supply driver output
current), the Edge749 I/O range can be optimized for a
variety of applications (see Figure 6).
VCC
VDD
V
1
1N5820 or
Equivalent
VCC
Edge 749
VEE
VDD
Figure 5.
Power Supply Protection Scheme
V
2
Power Supplies Decoupling
Figure 6.
VDD, which provides the digital power, should be There are three rules which govern the supplies V1 and
decoupled to GND with a .1 µF chip capacitor in parallel V2:
with a .001 µF chip capacitor. The bypass capacitors
should be as close to the device as possible. Power and
ground planes are recommended to provide a low
inductance return path.
1) +10V < V1 < +18V
2) –3V < V2 < 0V
3) (V1 – V2) < +18V.
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2000 Semtech Corp.
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Edge749
EDGE HIGH-PERFORMANCE PRODUCTS
Application Information (continued)
Window Comparator
Trinary Driver
Certain applications require a dual threshold window
comparator to distinguish between the DUT being high,
low, or floating. To support this application, two Edge749
channels can be combined to create one channel with a
window comparator (see Figure 7). Notice that
connecting two DUT pins ties together the positive inputs
of both receivers. The result is a difference in polarity
between the digital outputs reporting the high and low
status of the DUT.
At times, there is a need for a three-level driver. Typically,
two levels are required for the standard digital “1” and
“0” pattern generation. The third level provides a higher
voltage to place the device under test (DUT) into a
programming or test mode. By controlling the DATA IN
and DVR EN* inputs, a trinary driver with tristate is
realizable (see Figure 8).
Driver with Pull Up/Pull Down
–
High Threshold
As the drivers are unbuffered, paralleling two drivers for
one DUT node provides a means for adding pull up or
pull down capability. By connecting the VHIGH and VLOW
inputs of one driver through a resistor to a voltage,
additional functionality that would normally require an
external relay on the DUT transmission line to engage
and disengage these functions is realizable.
DUT HIGH
+
DUT
+
DUT LOW*
–
Low Threshold
Figure 7. Edge749 as a
Window Comparator
One common application for the pull up feature is testing
open collector devices. The pull down satisfies open
emitter DUTs (typically ECL). Either the pull up or down
could be used to establish a default high impedance
voltage on a bidirectional bus. Notice that in all
applications, the resistors can be switched dynamically
or statically.
Once two receivers are connected as window
comparators, the two drivers also get connected in
parallel. This dual driver configuration supports a
multitude of applications that have traditionally been
difficult to accommodate.
V
A
V
A
LOW
HIGH
DATA IN A
DVR EN*A
V
V
B
A
A
HIGH
HIGH
DUT
V
B
HIGH
V
LOW
DATA IN B
DVR EN*B
Figure 8. Trinary Driver
2000 Semtech Corp.
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Edge749
EDGE HIGH-PERFORMANCE PRODUCTS
Application Information (continued)
Also, either the pull up or pull down resistor could be
used to terminate the transmission from the DUT to the
pin electronics in an effort to minimize any reflections.
Two Logic Family Driver
Many test systems support exactly two families of driver
and receiver levels and select between family A and family
B settings on a per-pin basis, typically using an analog
multiplexer (See Figure 11). Common examples of these
families are:
V
A
V
A
LOW
HIGH
DATA IN A
DVR EN*A
DUT
Family A = TTL
Family B = CMOS
or
Family A = TTL
Family B = ECL
V
B
B
HIGH
V
PULL UP
DATA IN B
DVR EN*B
V
PULL DOWN
V
LOW
The Edge749 supports this system architecture with
minimal hardware and the elimination of the per-pin
analog multiplexer. The drive and receive levels need to
be generated once per system, then distributed and
buffered suitably.
Figure 9. Driver with Pull Up/ Pull Down
Trinary Driver with Termination
Parametric Functions
Other combinations are also possible. For example, two
parallel drivers can be configured to implement one
trinary driver with a pull down (or pull up) dynamic
termination (see Figure 10).
Two drivers in parallel also offer the possibility of
connecting force and sense parametric circuitry to the
DUT without adding additional circuitry to the controlled
impedance DUT line. For example, Figure 12 shows the
second driver being utilized to force a current and
measure a voltage.
V
HIGH
A
V
LOW
A
DATA IN A
DVR EN*A
Notice that the VHIGH and VLOW pins are used from
different drivers to allow the force and sense functions
to be active simultaneously.
DUT
V
HIGH
B
V
TERMINATION
DATA IN B
DVR EN*B
Figure 10. Trinary Driver with Termination
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2000 Semtech Corp.
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Edge749
EDGE HIGH-PERFORMANCE PRODUCTS
Application Information (continued)
CHANNEL 1
CHANNEL n
V
V
A
B
HIGH
HIGH
DVR EN*A
DVR DATA
DVR EN*A
DVR DATA
DUT0
DUT0
DVR EN*B
DVR EN*B
V
V
B
A
LOW
LOW
Figure 11. Family A/ B Using Two Drivers Per Pin
Edge749 Ron vs. Vout - VCC=+16.5V, VEE=-1.5V
Driver Output Impedance
9.5
9
Ideally, a driver would have a constant
output impedance over all ouptut
conditions. However, the Edge749
ouptut impedance does vary slightly
over the common mode drive level and
whether it is driving high or low. Figure
12 shows the variation in Rout.
8.5
8
R_VLO
R_VHI
7.5
7
6.5
6
Vout [V]
Figure 12. ROUT vs. DOUT
Edge749 Leakage in HIZ
- VCC=+16.5V, VEE=-1.5V
10
8
High Impedance Leakage
6
4
The Edge749 is designed to be
extremely low leakage (see Figure 13.)
In a low performance application, where
the output capacitance is not a concern,
the low leakage may allow the
elimination of an isolation relay.
2
0
VLO=0, VHI=+8
- 2
- 4
- 6
- 8
-10
Dout [Volts]
Figure 13. High Impedance Leakage
2000 Semtech Corp.
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Edge749
EDGE HIGH-PERFORMANCE PRODUCTS
Package Information
68 Pin PLCC Package
θJA = 42 to 48˚C / W
PIN Descriptions
0.990 SQ
[25.146]
See Detail A
0.048
[1.219]
0.953 SQ
[24.206]
0.045 SQ
[1.143]
0.910
[23.114]
0.800 REF
[20.32]
0.113
[2.87]
0.175
[4.445]
0.029
[0.736]
0.016
[0.406]
0.065
[1.651]
0.029
[0.736]
0.016
[0.406]
0.030
[0.762]
0.020
[0.508]
MIN
Notes: (unless otherwise specified)
1. Dimensions are in inches [millimeters].
2. Tolerances are: .XXX ± 0.005 [0.127].
3. PLCC packages are intended for surface mounting on solder lands on 0.050 [1.27] centers.
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2000 Semtech Corp.
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Edge749
EDGE HIGH-PERFORMANCE PRODUCTS
Recommended Operating Conditions
Parameter
Symbol
Min
Typ
Max
Units
Digital Power Supply
VDD
VCC
4.5
10
5
15
-2
5.5
18
V
V
V
V
V
V
V
V
Analog Positive Power Supply
Analog Negative Power Supply
Total Analog Power Supply
Driver High Output Voltage
Driver Low Output Voltage
Total Driver Output Swing
Receiver Threshold Voltage
Ambient Operating Temperature
VEE
-3
0
VCC - VEE
VHIGH
10
18
VEE
VEE
-18
VCC
VCC
18
VLOW
VHIGH - VLOW
THRESHOLD
VEE + 3
VCC - 3
TA
TJ
0
0
+70
+125
oC
oC
Absolute Maximum Ratings
Parameter
Symbol
VCC - VEE
VCC
Min
Typ
Max
19
Units
Total Analog Power Supply
Positive Analog Power Supply
Negative Analog Power Supply
Driver High Output Voltage
Driver Low Output Voltage
V
V
V
V
V
-.5
-5
19
VEE
0.5
VHIGH
VEE - .5
VEE - .5
VCC + .5
VCC + .5
VLOW
Driver Output Swing
VHIGH - VLOW
THRESHOLD
-18.5
18.5
V
Receiver Threshold Voltage
Digital Inputs
VEE - .5
GND - .5
VCC + .5
VDD + .5
V
V
DATA IN
DVR EN*
Digital Power Supply
VDD
TA
0
6.5
V
Ambient Operating Temperature
Storage Temperature
-55
-65
+125
+150
+150
260
oC
oC
oC
oC
TS
Junction Temperature
Soldering Temperature
TJ
TSOL
Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the
device. This is a stress rating only, and functional operation of the device at these, or any other conditions
beyond those listed, is not implied. Exposure to absolute maximum conditions for extended periods may
affect device reliability.
2000 Semtech Corp.
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Edge749
EDGE HIGH-PERFORMANCE PRODUCTS
DC Characteristics
Parameter
Symbol
Min
Typ
Max
Units
Driver/ Receiver Characteristics
Output Voltage Swing
V
- V
-18
-125
4
18
+125
12
V
mA
Ω
HIGH
LOW
DC Driver Output Current (Note 1)
Output Impedance (Note 2)
DUT Pin Capacitance
I
OUT
R
C
8
OUT
OUT
20
pF
V
DUT Output voltage
DUT<0:7>
VEE
VCC
VCC - 3
1.0
Receiver Threshold Level
Threshold Bias Current
V
VEE + 3
V
THRESHOLD
0
µA
µA
mV
DUT Leakage Input Current
Receiver Offset Voltage (Note 3)
I
.001
1.0
BIAS
VOS
-200
-60
200
Quiescent Power Supply Current
Positive Power Supply
ICC
IEE
IDD
60
-40
5
80
15
mA
mA
mA
Negative Power Supply
Digital Power Supply
Digital Inputs
DATA IN (0:7), DVR EN* (0:7)
Input High Voltage
Input Low Voltage
Input Current
VIH
2.0
0
VDD
0.8
1.0
V
V
MIN
VIL
MAX
I
µA
pF
IN
Input Capacitance
C
5
0
IN
Digital Outputs
DATA OUT (0:7)
Output Voltage High (Note 4)
Output Voltage Low (Note 5)
DC Output current
VOH
VOL
VDD - .4
-0.4
VDD + .4
V
V
0.4
4
I
mA
OUT
Note 1 : Output current specification is per individual driver.
Note 2 : Tested for driving a high state and low state at +18V, +6V, and 0V.
Note 3 : Measured at THRESHOLD = +1.5V.
Note 4: Output current of –4 mA.
Note 5: Output current of 4 mA.
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Edge749
EDGE HIGH-PERFORMANCE PRODUCTS
AC Characteristics
Parameter
Symbol
Min
Typ
Max
Units
Propagation Delay
DATA IN <0:7> to DUT <0:7>
DUT <0:7> to DATA OUT <0:7>
Active to HiZ
T1
T2
T3
T4
20
10
20
20
29
21
32
28
38
30
40
35
ns
ns
ns
ns
HiZ to Active
DUT Output Rise/Fall Times (Note 1)
1V Swing (20% - 80%)
1.0
1.5
1.5
1.5
1.5
ns
ns
ns
ns
ns
3V Swing (10% - 90%)
5V Swing (10% - 90%)
8V Swing (10% - 90%)
10V Swing (10% - 90%)
Digital Outputs (DATA OUT <0:7>)
DATA OUT Rise Time (10% - 90%)
DATA OUT Fall Time (10% - 90%)
TR
TF
2.5
2.5
ns
ns
Minimum Pulse Width
Driver Output
25
20
20
15
ns
ns
Comparator Output
Maximum Operating Frequency
Fmax
15
20
MHz
Note 1: Into 18 inches of 50Ω transmission line terminated with 1KΩ and 5 pF with the proper
series termination resistor.
T1
T2
DATA IN
DUT
DATA OUT
DVR EN*
DUT
HiZ
T3
T4
2000 Semtech Corp.
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Edge749
EDGE HIGH-PERFORMANCE PRODUCTS
Ordering Information
Model Number
Package
E749BPJ
68-Pin PLCC
EVM749EVM
Edge749 Evaluation Module
Contact Information
Semtech Corporation
Edge High-Performance Division
10021 Willow Creek Rd., San Diego, CA 92131
Phone: (858)695-1808 FAX (858)695-2633
www.semtech.com
2000 Semtech Corp.
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