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PDF EDGE737 Data sheet ( Hoja de datos )
| Número de pieza | EDGE737 | |
| Descripción | Per-Pin Precision Measurement Unit | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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TEST AND MEASUREMENT PRODUCTS
Description
Features
Edge737
Per-Pin Precision
Measurement Unit
The Edge737 is a precision measurement unit designed
for automatic test equipment and instrumentation.
Manufactured in a wide voltage CMOS process, it is a
monolithic solution for a per pin PMU.
The Edge737 supports two modes of operation: force
current/measure voltage and force voltage/measure
current. The Edge737 can force or measure voltage in
the range of +7V to –5V. In addition, the Edge737 can
force or measure a current of up to 40 mA over four distinct
ranges: ± 40 mA, ± 1 mA, ± 100 µA and ± 10 µA.
• FV / MI Capability
• FI / MV Capability
• 4 Current Ranges (± 40 mA, ± 1 mA, ± 100 µA,
± 10 µA)
• +7V / –5V I / O Range
• Short Circuit Protection
• Clamps for limiting mode and range select transients
The Edge737 has an on board window comparator that
provides three bits of information: DUT too high, DUT too
low, and DUT fail. There is also a monitor function which
provides a real time analog voltage signal proportional to
either the DUT voltage or current.
On board clamps prevent large transient spikes when
changing operating mode or current range. Also, the PMU
will survive a direct short over the legal voltage range.
Applications
• Automatic Test Equipment
- Memory Testers
- VLSI Testers
- Mixed Signal Tester
The Edge737 is designed to be a low power, low cost,
small footprint solution to allow high pin count testers to
support a PMU per pin.
Functional Block Diagram
HIZ
VINP
IVIN
FORCE
MODE SEL
Revision 5 / February 20, 2003
I/V MAX
I/V MIN
DISABLE
Comparators
Detector Logic
Voltage Monitor
1
SENSE
DUT LTH
PASS/FAIL*
DUT GTL
I/V MONITOR
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1 page  
Edge737
TEST AND MEASUREMENT PRODUCTS
Circuit Description (continued)
HIZ
HIZ is a digital input which places the FORCE output into a
high impedance state, regardless of the operating mode
(forcing current or voltage.) This function allows the PMU
to be connected directly to the pin electronics without an
isolation relay while NOT adding any leakage current.
The voltage at I/V MONITOR follows the equation:
I(measured) = I/V MONITOR / (4.0 * REXT).
Nominally, the external resistors (RA, RB, RC, and RD)
should be chosen such that Imax * REXT = 2.0V.
DISABLE
Force Current / Measure Voltage Mode
DISABLE is a digital input which places DUT LTH, DUT GTL,
I/V MONITOR, and PASS/FAIL* into high impedance states.
Force Voltage / Measure Current Mode
In the FV / MI mode, VINP is a high input impedance,
analog voltage input that maps directly to the voltage forced
at the DUT (see Figure 1), where FORCE = VINP.
In the FI / MV mode, IVIN is a high input impedance,
analog voltage input that is converted into a current (see
Table 5) using the following relationship:
FORCE = IVIN / (4.0 * REXT)
with positive current is defined as current flowing out of
the PMU.
A current monitor is connected in series with the Op Amp
driving the FORCE voltage. This monitor generates a
voltage that is proportional to the current passing through
it, and its output is brought out to I/V MONITOR. The
monitor’s voltage may also be evaluated using the Window
Comparator whose operation is in accordance with the
FV/MI functional truth table (Table 6).
IVIN
+8.0V
0V
–8.0V
Forced Current
Imax (full scale)
0
Imin (full scale)
Table 5.
I/V MAX and I/V MIN are high impedance analog inputs
that establish the upper and lower thresholds for the
window comparator (see Table 4). In the FV / MI mode, a
maximum voltage input corresponds to at least a maximum
current output. Positive current is defined as current
flowing out of the PMU.
I/V MAX
I/V MIN
Comparator
Threshold
The resulting DUT voltage is then tested via the SENSE
input by a window comparator, whose functional truth table
is shown in Table 7.
I/V MAX and I/V MIN are high impedance analog inputs
that establish the upper and lower thresholds for the win-
dow comparator. In the FI / MV mode, the reference in-
puts translate 1:1 to SENSE level thresholds.
+8.0V
0V
–8.0V
> Imax (full scale)
0
< Imin (full scale)
Table 4.
Revision 5 / February 20, 2003
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5 Page 
TEST AND MEASUREMENT PRODUCTS
Package Information
32 Pin TQFP Package
7 mm x 7 mm x 1.4 mm
TOP VIEW
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Edge737
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| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet EDGE737.PDF ] | |
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