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부품번호 E649BPJ 기능
기능 Octal Pin Electronics Driver/Receiver
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E649BPJ 데이터시트, 핀배열, 회로
EDGE HIGH-PERFORMANCE PRODUCTS
Description
Features
Edge649
Octal Pin Electronics
Driver/Receiver
The Edge649 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 Edge649 incorporates eight channels of
programmable drivers and receivers into one package.
Each channel has per pin driver levels, receiver threshold,
and tristate control.
• 50 MHz Operation
• 11 V DUT I/O Range
• Programmable Output Levels
• Programmable Input Thresholds
• Per Pin Flexibility
• High Integration Levels
• 615 mW Quiescent Power Dissipation
• Edge648 Compatible
The 11V driver output and receiver input range allows
the Edge649 to interface directly between TTL, ECL,
CMOS (3V, 5V, and 8V), and custom level circuitry.
The Edge649 is pin and functionally compatible with the
EDGE648, with the following performance differences:
• reduced driver preshoot
• faster driver propagation delay
• superior driver pulse width distortion
• higher driver Fmax operation
• slightly slower driver output slew rates
• higher comparator Fmax operation
• lower comparator propagation delay
• superior comparator pulse width
distortion.
Functional Block Diagram
VHIGH VLOW
88
Applications
• Burn-In ATE
• Functional Board Testers
• In-Circuit Board Testers
• Combinational Board Testers
• Low Cost Chip Testers
• ASIC Verifiers
• VXI-Based Test Equipment
DATA IN
8
DVR EN*
8
DATA OUT
8
+
8
DUT
8
THRESHOLD
Revision 1/ October 28, 1996
1
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E649BPJ pdf, 반도체, 판매, 대치품
Edge649
EDGE HIGH-PERFORMANCE PRODUCTS
Circuit Description
Driver Description
VHIGH and VLOW
VHIGH
VLOW
DATA IN
DUT
VHIGH and VLOW define the logical 1and 0levels 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).
DVR EN*
Figure 1. Driver Diagram
As shown in Figure 1, Edge649 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).
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.
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*
DATA IN
DUT
VHIGH
VLOW
Figure 2. Driver Functionality
VLOW
Figure 3.
Simplified Model of the
Unbuffered Output Stage
Drive/Receive
Common Mode Range
0V <= DUT <= +6.5V
Threshold
Range
0.1V <= THRESHOLD <= 5.0V
0V <= DUT <= +8V
0.1V <= THRESHOLD <= 6.5V
0V <= DUT <= +11V
0.1V <= THRESHOLD <= 9.5V
-3V <= DUT <= +8V
-2.9V <= THRESHOLD <= 6.5V
2000 Semtech Corp.
Table 1. Power Supply Requirement
4
Power Supply
Conditions
VCC = +6.5V
VEE = 0V
VCC = +8V
VEE = 0V
VCC + 11V
VEE = 0V
VCC = +8V
VEE = -3V
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E649BPJ 전자부품, 판매, 대치품
EDGE HIGH-PERFORMANCE PRODUCTS
Application Information (continued)
Edge649
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 Edge649
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 1and
0pattern 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
DUT LOW*
+
+
High Threshold
DUT
Low Threshold
Figure 7. Edge649 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.
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.
VHIGH A
VLOW A
DATA IN A
DVR EN*A
DATA IN B
DVR EN*B
2000 Semtech Corp.
VHIGH B
DUT
VHIGH B
VHIGH A
VLOW A
Figure 8. Trinary Driver
7
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E649BPJ

Octal Pin Electronics Driver/Receiver

Semtech Corporation
Semtech Corporation

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