Page 1
EDGE HIGH-PERFORMANCE PRODUCTS
Edge749
Octal Pin Electronics
Driver/Receiver
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.
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.
The Edge749 is pin and functionally compatible with the
Edge648 and Edge649.
Functional Block Diagram
Features
• 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
• Burn-In ATE
• Functional Board Testers
• In-Circuit Board Tester s
• Combinational Board Testers
• Low Cost Chip Testers
• ASIC Verifiers
• VXI-Based Test Equipment
V
HIGH
8
DATA I N
8
DVR EN*
DATA O UT
8
Revision 1/ June 23, 1998
V
+
–
LOW
88
8
8
DUT
THRESHOLD
1
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Page 2
EDGE HIGH-PERFORMANCE PRODUCTS
PIN Description
emaNniPrebmuNniPnoitpircseD
Edge749
)7:0(NIATAD,76,66,56,46
6,5,4,3
)7:0(TUOATAD,95,85,75,65
41,31,21,11
)7:0(TUD,73,04,34,64
42,72,03,33
)7:0(NERVD,36,26,16,06
01,9,8,7
)7:0(HGIHV,83,93,44,54
52,62,13,23
)7:0(WOLV,63,14,24,44
32,82,92,43
)7:0(DLOHSERHT,35,25,15,05
02,91,81,71
CCV94,12.ylppusrewopevitisopgolanA
TUDehtfosutatswol/hgihehtenimretedtahtstupnielbitapmocLTT
.srevird
.sreviecerTUDehtfosutatsehtetacidnitahtstuptuolevelSOMC
.tsetrednuecivedehtevird/eviecertahtstuptuo/stupnicinortceleniP
ehtfoetatsecnadepmihgihehtlortnoctahtstupnielbitapmoclTT
.srevirdTUD
ehtfo1lacigolafolevelegatlovehttestahtstupnigolanadereffubnU
.srevirdTUD
ehtfo0lacigolafolevelegatlovehttestahtstupnigolanadereffubnU
.srevirdTUD
TUDehtrofdlohserhtehtstestahtegatlovtupnigolanadereffuB
.srotarapmoc
EEV84,22.ylppusrewopevitagengolanA
DDV55,51,1.ylppusrewoplatigiD
DNG86,45,61,2.dnuorgeciveD
C/N53.noitcennocoN
2 2000 Semtech Corp.
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Page 3
EDGE HIGH-PERFORMANCE PRODUCTS
PIN Description (continued)
DVR EN*0
DATA OUT3
DATA OUT2
DATA OUT1
DATA OUT0
VDD
60
59
58
57
56
55
GND
THRESHOLD3
54
53
52
THRESHOLD2
THRESHOLD1
THRESHOLD0
VCC
51
50
49
VEE
48
VLOW0
DUT0
47
46
VHIGH0
VHIGH1
45
44
Edge749
DVR EN*1
DVR EN*2
DVR EN*3
DATA IN0
DATA IN1
DATA IN2
DATA IN3
GND
VDD
GND
DATA IN4
DATA IN5
DATA IN6
DATA IN7
DVR EN*4
DVR EN*5
DVR EN*6
61
62
63
64
65
66
67
68
1
2
3
4
5
6
7
8
9
10
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
DUT1
VLOW1
VLOW2
DUT2
VHIGH2
VHIGH3
DUT3
VLOW3
NC
VLOW4
DUT4
VHIGH4
VHIGH5
DUT5
VLOW5
VLOW6
DUT6
2000 Semtech Corp.
DVR EN*7
DATA OUT4
DATA OUT5
DATA OUT6
DATA OUT7
VDD
GND
THRESHOLD4
THRESHOLD5
THRESHOLD6
THRESHOLD7
3
VCC
VEE
DUT7
VLOW7
VHIGH7
VHIGH6
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Page 4
EDGE HIGH-PERFORMANCE PRODUCTS
Circuit Description
Edge749
Driver Description
DATA IN
DVR EN*
V
HIGH
Figure 1. Driver Diagram
V
LOW
DUT
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).
With DVR EN* high, the DUT driver goes into a high
impedance state. With DVR EN* low , D AT A IN high forces
the driver into a high state (DUT = V
low forces the driver low (DUT = V
LOW
), and DATA IN
HIGH
).
V
V
HIGH
HIGH
and V
and V
LOW
define the logical “1” and “0” levels of
LOW
the DUT driver and can be adjusted anywhere over the
range determined by VCC and VEE. T able 1 documents
the relationship between the analog power to supplies
(VCC and VEE), the driver range (V
the comparator threshold range (V
The V
HIGH
and V
inputs are unbuffered in that they
LOW
and V
HIGH
THRESHOLD
).
LOW
), and
also provide the driver output current (see Figure 3), so
the source of V
HIGH
and V
must have ample current
LOW
drive capability.
V
HIGH
DUT
DVR EN*
DATA IN
DUT
Figure 2. Driver Functionality
evirD
egnaRedoMnommoC
CCV=<TUD=<EEVCCV=<TUD=<EEVV3-COV=<DLOHSERHT=<V3+EEV
V
HIGH
V
LOW
evieceR
egnaRedoMnommoC
Table 1. Headroom vs. Power Supplies
V
LOW
Figure 3.
Simplified Model of the
Unbuffered Output Stage
dlohserhT
egnaR
4 2000 Semtech Corp.
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Page 5
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
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
THRESHOLD
DATA OUT
THRESHOLD
DATA OUT
+
–
DUT
Tpd
Figure 4. Receiver Functionality
2000 Semtech Corp.
5
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Page 6
EDGE HIGH-PERFORMANCE PRODUCTS
Application Information
Power Supplies
Edge749
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.
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).
The three-Schottky diode configuration shown in Figure
5, used on a once-per-board basis, insures power supply
sequence and fault tolerance.
VCC
VDD
VCC and VEE, which pow er 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.
V
and V
HIGH
As the V
HIGH
LOW
and V
Decoupling
inputs are unbuffered and must
LOW
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
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).
1N5820 or
Equivalent
VEE
Figure 5.
Power Supply Protection Scheme
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. Pow er and
ground planes are recommended to provide a low
inductance return path.
V
1
VCC
Edge 749
VDD
V
2
Figure 6.
There are three rules which govern the supplies V1 and
V2:
1) +10V < V1 < +18V
2) –3V < V2 < 0V
3) (V1 – V2) < +18V.
6 2000 Semtech Corp.
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Page 7
EDGE HIGH-PERFORMANCE PRODUCTS
Application Information (continued)
Edge749
Window Comparator
Certain applications require a dual threshold window
comparator to distinguish between the DUT being high,
low, or floating. T o 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.
DUT HIGH
DUT LOW*
–
+
+
–
Figure 7. Edge749 as a
Window Comparator
High Threshold
DUT
Low Threshold
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.
Trinary Driver
At times, there is a need for a three-le vel driver . T ypically ,
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
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 V
HIGH
and V
LOW
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.
DATA IN A
DVR EN*A
DATA IN B
DVR EN*B
2000 Semtech Corp.
V
HIGH
A
V
HIGH
V
A
LOW
B
Figure 8. Trinary Driver
DUT
V
B
HIGH
V
A
HIGH
V
A
LOW
7
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Page 8
EDGE HIGH-PERFORMANCE PRODUCTS
Application Information (continued)
Edge749
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.
V
A
V
LOW
B
B
A
V
PULL UP
V
PULL DOWN
DUTDATA IN A
DVR EN*A
DATA IN B
DVR EN*B
HIGH
V
V
HIGH
LOW
Figure 9. Driver with Pull Up/Pull Down
Trinary Driver with T ermination
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).
V
A
V
HIGH
DATA IN A
LOW
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:
Family A = TTL
Family B = CMOS
or
Family A = TTL
Family B = ECL
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.
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.
DVR EN*A
DATA IN B
DVR EN*B
V
HIGH
B
V
TERMINATION
Figure 10. Trinary Driver with Termination
DUT
Notice that the V
HIGH
and V
pins are used from
LOW
different drivers to allow the force and sense functions
to be active simultaneously.
8 2000 Semtech Corp.
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Page 9
EDGE HIGH-PERFORMANCE PRODUCTS
Application Information (continued)
Edge749
CHANNEL 1
V
A
HIGH
V
B
HIGH
DVR EN*A
DVR DATA
DVR EN*B
V
B
LOW
V
A
LOW
Figure 11. Family A/B Using Two Drivers Per Pin
Driver Output Impedance
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.
CHANNEL n
DVR EN*A
DVR DATA
DUT0
DVR EN*B
DUT0
Edge749 Ron vs. Vout - VCC=+16.5V, VEE=-1.5V
9.5
9
8.5
8
7.5
Ron [Ohms]
7
6.5
6
0.5
1.5
2.5
3.5
4.5
5.5
6.5
7.5
8.5
-1.5
-0.5
Vout [V]
9.5
10.5
11.1
12.5
13.5
14.5
15.5
16.5
R_VLO
R_VHI
High Impedance Leakage
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.
2000 Semtech Corp.
Figure 12. ROUT vs. DOUT
Edge749 Leakage in HIZ - VCC=+16.5V, VEE=-1.5V
10
8
6
4
2
0
-2
-4
Leakage Current [nA]
-6
-8
-10
012345678
-3-2-1
Dout [Volts]
9
10111213141516
17
VLO=0, VHI=+8
Figure 13. High Impedance Leakage
9
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Page 10
EDGE HIGH-PERFORMANCE PRODUCTS
Package Information
68 Pin PLCC Package
θJA = 42 to 48˚C / W
Edge749
PIN Descriptions
0.990 SQ
[25.146]
0.953 SQ
[24.206]
0.045 SQ
[1.143]
0.016
[0.406]
0.048
[1.219]
0.800 REF
[20.32]
0.175
[4.445]
0.029
[0.736]
See Detail A
0.910
[23.114]
0.113
[2.87]
0.065
0.029
[0.736]
0.016
[0.406]
0.020
[0.508]
MIN
[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.
10 2000 Semtech Corp.
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Page 11
EDGE HIGH-PERFORMANCE PRODUCTS
Recommended Operating Conditions
retemaraPlobmySniMpyTxaMstinU
ylppuSrewoPlatigiDDDV5.455.5V
ylppuSrewoPevitisoPgolanACCV015181V
ylppuSrewoPevitageNgolanAEEV3-2-0V
ylppuSrewoPgolanAlatoTEEV-CCV0181V
Edge749
egatloVtuptuOhgiHrevirDV
egatloVtuptuOwoLrevirDV
gniwStuptuOrevirDlatoTV
egatloVdlohserhTrevieceRDLOHSERHT3+EEV3-CCVV
Absolute Maximum Ratings
retemaraPlobmySniMpyTxaMstinU
ylppuSrewoPgolanAlatoTEEV-CCV91V
ylppuSrewoPgolanAevitisoPCCV5.-91V
ylppuSrewoPgolanAevitageNEEV5-5.0V
egatloVtuptuOhgiHrevirDV
egatloVtuptuOwoLrevirDV
gniwStuptuOrevirDV
erutarepmeTgnitarepOtneibmAAT
HGIH
WOL
V-
HGIH
WOL
JT
HGIH
WOL
V-
HGIH
WOL
EEVCCVV
EEVCCVV
81-81V
0
0
5.-EEV5.+CCVV
5.-EEV5.+CCVV
5.81-5.81V
07+
521+
o
C
o
C
egatloVdlohserhTrevieceRDLOHSERHT5.-EEV5.+CCVV
stupnIlatigiDNIATAD
*NERVD
ylppuSrewoPlatigiDDDV0 5.6V
erutarepmeTgnitarepOtneibmAAT55-521+
erutarepmeTegarotSST56-051+
erutarepmeTnoitcnuJJT051+
erutarepmeTgniredloSLOST062
5.-DNG5.+DDVV
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.
11
www.semtech.com
o
C
o
C
o
C
o
C
Page 12
EDGE HIGH-PERFORMANCE PRODUCTS
DC Characteristics
retemaraPlobmySniMpyTxaMstinU
scitsiretcarahCrevieceR/revirD
Edge749
gniwSegatloVtuptuOV
)1etoN(tnerruCtuptuOrevirDCDI
)2etoN(ecnadepmItuptuOR
ecnaticapaCniPTUDC
egatlovtuptuOTUD>7:0<TUDEEVCCVV
leveLdlohserhTrevieceRV
tnerruCsaiBdlohserhT 00.1Aµ
tnerruCtupnIegakaeLTUDI
)3etoN(egatloVtesffOrevieceRSOV002-002Vm
tnerruCylppuSrewoPtnecseiuQ
ylppuSrewoPevitisoP
ylppuSrewoPevitageN
ylppuSrewoPlatigiD
stupnIlatigiD
)7:0(*NERVD,)7:0(NIATAD
egatloVhgiHtupnIHIV
egatloVwoLtupnILIV
tnerruCtupnII
ecnaticapaCtupnIC
stuptuOlatigiD
)7:0(TUOATAD
V-
HGIH
WOL
TUO
TUO
TUO
DLOHSERHT
SAIB
CCI
EEI
DDI
NIM
XAM
NI
NI
81-81V
521-521+Am
48 21
02Fp
3+EEV3-CCVV
100.0.1Aµ
06
06-
0.2DDVV
08.0V
04-
5
5Fp
08
51
0.1Aµ
Ω
Am
Am
Am
)4etoN(hgiHegatloVtuptuOHOV4.-DDV4.+DDVV
)5etoN(woLegatloVtuptuOLOV4.0-04.0V
tnerructuptuOCDI
TUO
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.
12 2000 Semtech Corp.
4Am
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Page 13
EDGE HIGH-PERFORMANCE PRODUCTS
AC Characteristics
retemaraPlobmySniMpyTxaMstinU
yaleDnoitagaporP
>7:0<TUDot>7:0<NIATAD
>7:0<TUOATADot>7:0<TUD
ZiHotevitcA
evitcAotZiH
)1etoN(semiTllaF/esiRtuptuOTUD
)%08-%02(gniwSV1
)%09-%01(gniwSV3
)%09-%01(gniwSV5
)%09-%01(gniwSV8
)%09-%01(gniwSV01
)>7:0<TUOATAD(stuptuOlatigiD
)%09-%01(emiTesiRTUOATAD
)%09-%01(emiTllaFTUOATAD
Edge749
1T
2T
3T
4T
RT
FT
02
01
02
02
92
12
23
82
0.1
5.1
5.1
5.1
5.1
5.2
5.2
83
03
04
53
sn
sn
sn
sn
sn
sn
sn
sn
sn
sn
sn
htdiWesluPmuminiM
tuptuOrevirD
tuptuOrotarapmoC
ycneuqerFgnitarepOmumixaMxamF5102zHM
52
02
02
51
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
sn
sn
2000 Semtech Corp.
DVR EN*
DUT
HiZ
T3 T4
13
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Page 14
EDGE HIGH-PERFORMANCE PRODUCTS
Ordering Information
rebmuNledoMegakcaP
JPB947ECCLPniP-86
MVE947MVEeludoMnoitaulavE947egdE
Edge749
Contact Information
Semtech Corporation
Edge High-Performance Division
10021 Willow Creek Rd., San Diego, CA 92131
Phone: (858)695-1808 FAX (858)695-2633
14 2000 Semtech Corp.
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