SEMTECH E749BPJ

Edge749
Octal Pin Electronics
Driver/Receiver
TEST AND MEASUREMENT PRODUCTS
Description
Features
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.
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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.
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
Applications
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The Edge749 is pin and functionally compatible with the
Edge648 and Edge649.
Burn-In ATE
Functional Board Testers
In-Circuit Board Testers
Combinational Board Testers
Low Cost Chip Testers
ASIC Verifiers
VXI-Based Test Equipment
Functional Block Diagram
VHIGH
VLOW
8
8
8
DATA IN
8
8
DUT
DVR EN*
8
+
DATA OUT
–
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THRESHOLD
1
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Edge749
TEST AND MEASUREMENT PRODUCTS
PIN Description
Pin Name
Pin Number
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)
56, 57, 58, 59,
11, 12, 13, 14
CMOS level outputs that indicate the status of the DUT receivers.
DUT (0:7)
46, 43, 40, 37,
33, 30, 27, 24
Pin electronic inputs/outputs that receive/drive the device under test.
DVR EN (0:7)
60, 61, 62, 63,
7, 8, 9, 10
TTl compatible inputs that control the high impedance state of the
DUT drivers.
VHIGH (0:7)
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)
47, 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
21, 49
Analog positive power supply.
VEE
22, 48
Analog negative power supply.
VDD
1, 15, 55
GND
2, 16, 54, 68
Device ground.
N/C
35
No connection.
Revision 3 / October 21, 2002
Description
Digital power supply.
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Edge749
DVR EN*0
DATA OUT3
DATA OUT2
DATA OUT1
DATA OUT0
VDD
GND
THRESHOLD3
THRESHOLD2
THRESHOLD1
THRESHOLD0
VCC
VEE
VLOW0
DUT0
VHIGH0
VHIGH1
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
TEST AND MEASUREMENT PRODUCTS
PIN Description (continued)
DVR EN*1
61
43
DUT1
DVR EN*2
62
42
VLOW1
DVR EN*3
63
41
VLOW2
DATA IN0
64
40
DUT2
DATA IN1
65
39
VHIGH2
DATA IN2
66
38
VHIGH3
DATA IN3
67
37
DUT3
GND
68
36
VLOW3
VDD
1
35
NC
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22
23
24
25
26
VEE
VLOW7
DUT7
VHIGH7
VHIGH6
21
VCC
DUT6
20
VLOW6
27
THRESHOLD7
28
9
THRESHOLD6
8
DVR EN*6
19
DVR EN*5
18
VLOW5
THRESHOLD5
29
17
7
GND
DVR EN*4
THRESHOLD4
DUT5
16
VHIGH5
30
15
31
6
VDD
5
DATA IN7
14
DATA IN6
DATA OUT7
VHIGH4
DATA OUT6
32
13
4
12
DATA IN5
DATA OUT5
DUT4
11
VLOW4
33
DATA OUT4
34
3
10
2
DVR EN*7
GND
DATA IN4
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Edge749
TEST AND MEASUREMENT PRODUCTS
Circuit Description
VHIGH and VLOW
Driver Description
VHIGH
VLOW
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
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).
VHIGH
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*
VLOW
DATA IN
Figure 3.
Simplified Model of the
Unbuffered Output Stage
VHIGH
DUT
VLOW
Figure 2. Driver Functionality
Drive
Common Mode Range
Receive
Common Mode Range
Threshold
Range
VEE <= DUT <= VCC
VEE <= DUT <= VCC
VEE + 3V <= THRESHOLD <= VOC - 3V
Table 1. Headroom vs. Power Supplies
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Edge749
TEST AND MEASUREMENT 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.
DATA OUT
+
DUT
–
THRESHOLD
THRESHOLD
DUT
DATA OUT
Tpd
Figure 4. Receiver Functionality
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Edge749
TEST AND MEASUREMENT PRODUCTS
Application Information
Power Supplies
The Edge749 uses three power supplies: VDD, VCC and
VEE. VDD is the digital supply for all of the data inputs
and outputs. VCC and VEE are the analog power supplies
for the Edge749 drivers and comparators. In order to
protect the Edge749 and avoid damaging it, the following
power supply requirements must be satisifed at all times:
VEE ≤ GND ≤ VDD ≤ VCC
VEE ≤ All Inputs ≤ VCC at all times
Also,
The three-Schottky diode configuration shown in Figure
5, used on a once-per-board basis, insures power supply
sequence and fault tolerance.
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.
VHIGH and VLOW Decoupling
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
VCC
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).
VDD
1N5820 or
Equivalent
V1
VEE
VCC
Figure 5. Power Supply Protection Scheme
Power-On Sequencing
1. VCC (substrate)
2. VEE
3. VDD
4. Inputs
Power-Off Sequencing
1. Inputs
2. VDD
3. VEE
4. VCC
Edge 749
VDD
V2
Figure 6.
Power Supplies Decoupling
VDD, which provides the digital power, should be
decoupled to GND with a .1 µF chip capacitor in parallel
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.
There are three rules which govern the supplies V1 and
V2:
1) +10V < V1 < +18V
2) –3V < V2 < 0V
3) (V1 – V2) < +18V.
VCC and VEE, which power the DUT drivers and receivers,
should also be decoupled to GND with a .1 µF chip
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Edge749
TEST AND MEASUREMENT 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
–
DUT HIGH
High Threshold
+
DUT
+
DUT LOW*
–
Low Threshold
Figure 7. Edge749 as a
Window Comparator
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.
VHIGH A
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.
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.
VLOW A
DATA IN A
DVR EN*A
VHIGH B
DUT
VHIGH B
VHIGH A
VLOW A
DATA IN B
DVR EN*B
Figure 8. Trinary Driver
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Edge749
TEST AND MEASUREMENT 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.
VHIGH A
VLOW A
DATA IN A
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:
DUT
Family A = TTL
Family B = CMOS
or
Family A = TTL
Family B = ECL
DVR EN*A
VHIGH B
VPULL UP
DATA IN B
VPULL DOWN
DVR EN*B
VLOW B
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
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).
VHIGH A
VLOW A
Parametric Functions
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.
DATA IN A
DVR EN*A
DUT
VHIGH B
VTERMINATION
Notice that the VHIGH and VLOW pins are used from
different drivers to allow the force and sense functions
to be active simultaneously.
DATA IN B
DVR EN*B
Figure 10. Trinary Driver with Termination
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Edge749
TEST AND MEASUREMENT PRODUCTS
Application Information (continued)
CHANNEL 1
CHANNEL n
VHIGH A
VHIGH B
DVR EN*A
DVR EN*A
DVR DATA
DVR DATA
DUT0
DUT0
DVR EN*B
DVR EN*B
VLOW B
VLOW A
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
Ron [Ohms]
8.5
8
R_VLO
7.5
R_VHI
7
6.5
14.5
15.5
16.5
12.5
13.5
9.5
10.5
11.1
6.5
7.5
8.5
4.5
5.5
0.5
1.5
2.5
3.5
6
-1.5
-0.5
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.
Vout [V]
Figure 12. ROUT vs. DOUT
Edge749 Leakage in HIZ - VCC=+16.5V, VEE=-1.5V
10
High Impedance Leakage
8
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.
Leakage Current [nA]
6
4
2
0
VLO=0, VHI=+8
- 2
- 4
- 6
- 8
17
16
15
14
13
12
11
9
10
8
7
6
5
4
3
2
1
0
- 1
- 2
- 3
-10
Dout [Volts]
Figure 13. High Impedance Leakage
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Edge749
TEST AND MEASUREMENT PRODUCTS
Package Information
68 Pin PLCC Package
θJA = 42 to 48˚C / W
PIN Descriptions
0.990 SQ
[25.146]
0.048
[1.219]
See Detail A
0.953 SQ
[24.206]
0.045 SQ
[1.143]
0.800 REF
[20.32]
0.175
[4.445]
0.016
[0.406]
0.029
[0.736]
0.016
[0.406]
0.910
[23.114]
0.113
[2.87]
0.029
[0.736]
;;
;
0.020
[0.508]
MIN
0.065
[1.651]
0.030
[0.762]
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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Edge749
TEST AND MEASUREMENT PRODUCTS
Recommended Operating Conditions
Parameter
Symbol
Min
Typ
Max
Units
Digital Power Supply
VDD
4.5
5
5. 5
V
Analog Positive Power Supply
VCC
10
15
18
V
Analog Negative Power Supply
VEE
-3
-2
0
V
Total Analog Power Supply
VCC - VEE
10
18
V
Driver High Output Voltage
VHIGH
VEE
VCC
V
Driver Low Output Voltage
VLOW
VEE
VCC
V
Total Driver Output Swing
VHIGH - VLOW
-18
18
V
Receiver Threshold Voltage
THRESHOLD
VEE + 3
VCC - 3
V
TA
TJ
0
0
+70
+125
oC
oC
Symbol
Min
Max
Units
19
V
Ambient Operating Temperature
Absolute Maximum Ratings
Parameter
Total Analog Power Supply
VCC - VEE
Typ
Positive Analog Power Supply
VCC
-.5
19
V
Negative Analog Power Supply
VEE
-5
0.5
V
Driver High Output Voltage
VHIGH
VEE - .5
VCC + .5
V
Driver Low Output Voltage
VLOW
VEE - .5
VCC + .5
V
Driver Output Swing
VHIGH - VLOW
-18.5
18.5
V
Receiver Threshold Voltage
THRESHOLD
VEE - .5
VCC + .5
V
DATA IN
DVR EN*
GND - .5
VDD + .5
V
VDD
0
6.5
V
Ambient Operating Temperature
TA
-55
+125
oC
Storage Temperature
TS
-65
+150
oC
Junction Temperature
TJ
+150
oC
Soldering Temperature
TSOL
260
oC
Digital Inputs
Digital Power Supply
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.
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Edge749
TEST AND MEASUREMENT PRODUCTS
DC Characteristics
Parameter
Symbol
Min
V H I G H - VL O W
DC Driver Output Current (Note 1)
Typ
Max
Units
-18
18
V
IO U T
-125
+125
mA
Output Impedance (Note 2)
RO U T
4
12
Ω
DUT Pin Capacitance
CO U T
Driver/Receiver Characteristics
Output Voltage Swing
DUT Output voltage
Receiver Threshold Level
8
20
pF
DUT<0:7>
VEE
VCC
V
VT H R E S H O L D
VEE + 3
VCC - 3
V
0
1.0
µA
.001
1.0
µA
200
mV
80
15
mA
mA
mA
Threshold Bias Current
DUT Leakage Input Current
IB I A S
Receiver Offset Voltage (Note 3)
VOS
-200
Quiescent Power Supply Current
Positive Power Supply
Negative Power Supply
Digital Power Supply
ICC
IEE
IDD
-60
Input High Voltage
VIHM IN
2.0
VDD
V
Input Low Voltage
VILM A X
0
0.8
V
1.0
µA
60
-40
5
Digital Inputs
DATA IN (0:7), DVR EN* (0:7)
Input Current
IIN
Input Capacitance
CIN
5
pF
Digital Outputs
DATA OUT (0:7)
Output Voltage High (Note 4)
VOH
VDD - .4
Output Voltage Low (Note 5)
VOL
-0.4
DC Output current
IOUT
Note 1 :
Note 2 :
Note 3 :
Note 4:
Note 5:
0
VDD + .4
V
0. 4
V
4
mA
Output current specification is per individual driver.
Tested for driving a high state and low state at +18V, +6V, and 0V.
Measured at THRESHOLD = +1.5V.
Output current of –4 mA.
Output current of 4 mA.
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Edge749
TEST AND MEASUREMENT PRODUCTS
AC Characteristics
Parameter
Propagation Delay
DATA IN <0:7> to DUT <0:7>
DUT <0:7> to DATA OUT <0:7>
Active to HiZ
HiZ to Active
Symbol
Min
Typ
Max
Units
T1
T2
T3
T4
20
10
20
20
29
21
32
28
38
30
40
35
ns
ns
ns
ns
DUT Output Rise/Fall Times (Note 1)
1V Swing (20% - 80%)
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%)
Note 1:
ns
ns
ns
ns
ns
2.5
2.5
ns
ns
25
20
20
15
ns
ns
15
20
MHz
TR
TF
Minimum Pulse Width
Driver Output
Comparator Output
Maximum Operating Frequency
1.0
1.5
1.5
1.5
1.5
Fmax
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*
HiZ
DUT
T3
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T4
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Edge749
TEST AND MEASUREMENT PRODUCTS
Ordering Information
Model Number
Package
E749BPJ
68-Pin PLCC
EVM749EVM
Edge749 Evaluation Module
Contact Infor mation
Semtech Corporation
Test and Measurement Division
10021 Willow Creek Rd., San Diego, CA 92131
Phone: (858)695-1808 FAX (858)695-2633
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Edge749
TEST AND MEASUREMENT PRODUCTS
Revision History
Current Revision Date: October 21, 2002
Previous Revision Date: June 11, 2002
Page #
Section Name
6
Power Supplies
Previous Revision
Current Revision
Para 1 rewritten
Para 2 deleted
Power On and Off Sequencing added
Current Revision Date: June 11, 2002
Previous Revision Date: June 23, 1998
Page #
Section Name
Previous Revision
Current Revision
2
Pin Descriptions
VLOW
Change Pin #44 to Pin #47
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