TEST AND MEASUREMENT PRODUCTS
1
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Edge846
Pin Electronics Driver, Window
Comparator, and Switch Matrix
Description
Features
Functional Block Diagram
Applications
Revision 2 / October 21, 2002
The Edge846 is an integrated trinary driver, window
comparator, and switch matrix pin electronics solution
manufactured in a wide voltage CMOS process. It is
designed for automatic test equipment and
instrumentation where cost, functional density, and power
are all at a premium.
The tristatable driver is capable of generating 3 levels -
one for a logic high, one for a logic low, and one for either
a termination voltage or a special programming voltage.
The on-board window comparator effectively determines
whether the DUT is in a high, low, or intermediate state.
The switches are included to allow such functions as PMU,
pull-up, and pull-down connections.
The Edge846 is intended to offer an extremely low leakage,
low cost, low power, highly integrated, per pin solution
for 50 MHz and below pin electronics applications.
50 MHz Operation
18 V DUT I/O Range
Programmable Output Levels
Programmable Input Thresholds
Three Level Driver
Extremely Low Leakage Currents (<5 nA)
Small Footprint (32 Pin, 7 mm X 7 mm,
TQFP Package)
Low Cost ATE
COMPA
COMPB
LOAD1
LOAD0
CVA
VINP
CVB
SW3
SW3 EN*
SW0
KSW0
SW0 EN*
VH
VL
DOUT
VTT
DATA
DVR EN*
VTT EN
SW1
KSW1
SW1 EN*
SW2
KSW2
SW2 EN*
2
Revision 2 / October 21, 2002
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TEST AND MEASUREMENT PRODUCTS
Edge846
PIN Description
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Revision 2 / October 21, 2002
www .semtech.com
TEST AND MEASUREMENT PRODUCTS
Edge846
PRELIMINARY
PIN Description (continued)
DOUT
LOAD1
SW3
CVA
VINP
CVB
LOAD0
VBB
VTT
EN
DVR EN*
D
ATA
VCC
VEE
VTT
VL
VH
SW2
KSW2
KSW1
SW1
SW1 EN*
SW0 EN*
KSW0
SW0
SW3 EN*
HIGH LEVEL
LOW LEVEL
COMPA
VCC
COMPB
VEE
SW2 EN*
1
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4
Revision 2 / October 21, 2002
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TEST AND MEASUREMENT PRODUCTS
Edge846
Circuit Description
Driver Description
The Edge846 supports three programmable driver levels -
high, low, and termination - and high impedance. There
are no restrictions between any of these three levels in
that all three may vary independently over the entire
operating voltage range between VCC and VEE.
The DVR EN*, DATA, and VTT EN pins are digital inputs
that control the driver (see Table 1). With DVR EN* low,
DATA determines whether the driver will force VH or VL at
DOUT. With DVR EN* high, VTT EN* controls whether the
driver goes into high impedance or drives VTT.
Table 1. Driver Truth Table
VH, VL, and VTT
VH, VL, and VTT define the logical "1", "0", and
"termination" levels of the driver and can be adjusted
anywhere over the range spanned by VCC to VEE. There
is no restriction between VH, VL, and VTT, in that they can
all vary independently over the entire voltage range
determined by the power supply levels.
The VH, VL, and VTT inputs are unbuffered in that they
also provide the driver output current, so the sources of
these voltages must have ample current drive capability.
While VTT is referred to as the termination voltage, it may
also be used as a very high "programming" level on many
memory devices.
Driver Output Protection
The Edge846 is designed to operate in a functional testing
environment where a controlled impedance (typically 50
Ohms) is maintained between the pin electronics and the
DUT. In general, there will be an external resistor at the
driver output which series terminates the transmission line
to the DUT. In this environment, the driver 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.
The driver does NOT have on-chip short circuit protection
or limitation circuitry.
VBB
VBB is an analog input which establishes the threshold
for all digital input signals. If DATA, DVR EN*, or VTT EN
are more positive than VBB, these inputs are a digital "1".
Conversely, if they are more negative than VBB, they are
a "0".
All digital inputs are wide voltage comparator inputs, so
they are technology independent. By establishing the
appropriate VBB level, the Edge846 may be driven by TTL,
ECL, CMOS, or any custom level circuitry.
Figure 1. Digital Input Translation Stage
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5
Revision 2 / October 21, 2002
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TEST AND MEASUREMENT PRODUCTS
Edge846
PRELIMINARY
Receiver Functionality
The Edge846 supports an on-board window comparator.
CVB and CVA are high impedance analog inputs which
establish the threshold voltages. COMPA and COMPB are
the digital outputs which reflect the real time status of
VINP. Table 2 summarizes the relationship between the
threshold levels, VINP, and the output signals.
Table 2. Comparator Truth Table
Comparator Outputs
The digital outputs of the comparator are standard CMOS
outputs that are also adjustable. Input pins LOW LEVEL
and HIGH LEVEL establish the logic 0 and 1 levels
respectively. In normal operation, LOW LEVEL would be
connected to ground and HIGH LEVEL would be connected
to a system VDD supply, producing CMOS digital swings
at the output.
However, the comparator outputs are technology
independent in that they can drive PECL, 3V CMOS, ECL,
LVCMOS, GTL, and custom levels by varying LOW LEVEL
and HIGH LEVEL. For example, should a 3V swing be
desired, HIGH LEVEL could be connected to a 3.0V power
supply.
Notice that HIGH LEVEL and LOW LEVEL provide both the
voltage level and the current for the comparator outputs.
HIGH LEVEL and LOW LEVEL may be varied between +5V
and -2V.
Analog Switches
The Edge846 provides a total of 7 analog switches.
Individual switches vary in both their on resistance, their
on / off time, and their DC current rating (see Tables 4
and 5).
Like the driver digital inputs, the switch matrix control inputs
SW0-3 EN* are technology independent as VBB
determines their threshold level. The switch control is
documented in Table 3.
Table 3. Switch Matrix Truth Table
T
able 4. Switch Matrix Characteristics
All switch enable inputs have an internal pull up resistor
to VCC. When left floating, these enable pins will be high
and the corresponding switches will be open.
T
able 5. Switch Characteristics
Circuit Description (continued)
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Revision 2 / October 21, 2002
www .semtech.com
TEST AND MEASUREMENT PRODUCTS
Edge846
Circuit Description (continued)
Power Supplies
The Edge846 uses two power supplies for circuit operation;
VCC and VEE. In order to protect the Edge846 and avoid
damaging it, the following power supply requirements must
be satisifed at all times:
VEE
All Inputs
VCC
The sequence below can be used as a guideline when
operating the Edge846:
Power-On Sequencing
Power-Off Sequencing
1. VCC (substrate)
1. Inputs
2. VEE
2. VEE
3. Inputs
3. VCC
The three diode configuration shown in Figure 2 should
be used on a once-per-board basis to ensure power supply
sequence and fault tolerance.
Figure 2. Power Supply Protection Scheme
Warning: It is extremely important that the voltage
on any device pin does not exceed the range of VEE
0.5V to VCC +0.5V at any time, either during power
up, normal operation, or during power down. Failure
to adhere to this requirement could result in latchup
of the device, which could be destructive if the
system power supplies are capable of supplying large
amounts of current. Even if the device is not
immediately destroyed, the cumulative damage
caused by the stress of repeated latchup may affect
device reliability.
Power Supplies Decoupling
A .1
F capacitor is recommended between VCC and VEE.
In addition, solid VCC and VEE planes are recommended
to provide a low inductance path for the power supply
currents. These planes will reduce any inductive supply
drops associated with swtiching currents on the power
supply pins. If solid planes are not possible, then wide
power busses are preferable.
VH, VL, and VTT Decoupling
As the VH, VL, and VTT 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. In
general, a surge current of 50 mA (5V swings series
terminated with 50 Ohms into a 50 Ohm transmission
line) are the maximum dynamic output currents the driver
should see. The decoupling capacitors should be able to
provide this current for the duration of the round trip time
between the pin electronics and the DUT, and then
recharge themselves before the next such transition would
occur. Once this condition is satisfied, the VH, VL, and
VTT supply voltages are more responsible for establishing
the DC levels associated with each function and recharging
the capacitors, rather than providing the actual dynamic
currents required to drive the DUT transmission line.
Ideally, VH, VL, and VTT would each have a dedicated
power layer on the PC board for the lowest possible
inductance power supply distribution.
VCC
VDD
VEE
1N5820 or
Equivalent
External
System
Ground
7
Revision 2 / October 21, 2002
www .semtech.com
TEST AND MEASUREMENT PRODUCTS
Edge846
PRELIMINARY
Package Information
PIN Descriptions
b
D
3
4
4
e
N / 4 TIPS
4 X
E / 2
D / 2
SEE DETAIL "A"
E
0.20
C
A B
D
TOP VIEW
D1
E1
5
7
5
7
4 X
D1 / 2
E1 / 2
0.20
H
A B
D
BOTTOM VIEW
C
OO
8
Revision 2 / October 21, 2002
www .semtech.com
TEST AND MEASUREMENT PRODUCTS
Edge846
Package Information (continued)
3
DETAIL "A"
e / 2
b
0 MIN.
0.08 / 0.20 R.
GAUGE PLANE
0.25
0 7
L
C.08
R. MIN.
0.20 MIN.
1.00 REF.
DATUM
PLANE
H
A1
0.05
A2
S
DETAIL "B"
9
;;;
;;;
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S
D
C
ddd
M
A B
WITH LEAD FINISH
Lead
Cross Section
0.09 / 0.20
0.09 / 0.16
b
b
1
BASE METAL
2
8 PLACES
11 / 13
A
0.10
/ /
C
M
SEE DETAIL "B"
0.05
ccc
H
C
SECTION CC
Notes:
1.
All dimensions and tolerances conform to ANSI Y14.5-1982.
2.
Datum plane -H- located at mold parting line and coincident with
lead, where lead exits plastic body at bottom of parting line.
3.
Datums A-B and -D- to be determined at centerline between leads
where leads exit plastic body at datum plane -H-.
4.
To be determined at seating plane -C-.
5.
Dimensions D1 and E1 do not include mold protrusion.
6.
"N" is the total # of terminals.
7.
These dimensions to be determined at the datum plane -H-.
8.
Package top dimensions are smaller than bottom dimensions and
top of package will not overhang bottom of package.
9.
Dimension b does not include dambar protrusion. Allowable
dambar protrusion shall be 0.08 mm total in excess of the b
dimension at maximum material condition. Dambar cannot be
located on the lower radius or the foot.
10.
Controlling dimension: millimeter.
11.
Maximum allowable die thickness to be assembled in this
package family is 0.30 millimeters.
12.
This outline conforms to JEDEC publication 95, registration
MO-136, variations AC, AE, and AF.
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9
Revision 2 / October 21, 2002
www .semtech.com
TEST AND MEASUREMENT PRODUCTS
Edge846
PRELIMINARY
Recommended Operating Conditions
Absolute Maximum Ratings
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Stresses above 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 above those listed in the
operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended
periods may affect device reliability.
10
Revision 2 / October 21, 2002
www .semtech.com
TEST AND MEASUREMENT PRODUCTS
Edge846
DC Characteristics
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Note 1:
This parameter is guaranteed by design and characterization. Production testing is performed against
a
250 nA limit.
Note 2:
2V or VEE, whichever is more positive.
11
Revision 2 / October 21, 2002
www .semtech.com
TEST AND MEASUREMENT PRODUCTS
Edge846
PRELIMINARY
DC Characteristics (continued)
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Digital Inputs
DATA, DVR EN*, VTT EN, SW0 EN*, SW1 EN*, SW2 EN*, SW3 EN*
Digital Outputs
COMPA, COMPB
Note 1:
Output current of 4
A.
Note 2:
Output current of 4
A.
12
Revision 2 / October 21, 2002
www .semtech.com
TEST AND MEASUREMENT PRODUCTS
Edge846
AC Characteristics
r
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Note 1:
Into 18 inches of 50
transmission line terminated with 1K
and 5 pF with the proper series
termination resistor.
Note 2:
LOW LEVEL = 0V, HIGH LEVEL = 3.0V
13
Revision 2 / October 21, 2002
www .semtech.com
TEST AND MEASUREMENT PRODUCTS
Edge846
PRELIMINARY
Ordering Information
Contact Information
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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14
Revision 2 / October 21, 2002
www .semtech.com
TEST AND MEASUREMENT PRODUCTS
Edge846
Revision History
Current Revision Date:
February 3, 2000
Previous Revision Date: March 8, 1999
#
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