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Teilenummer | EDGE728 |
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Beschreibung | Very High Speed Dual and Quad Channel ECL Delay Lines | |
Hersteller | Semtech Corporation | |
Logo | ||
Gesamt 18 Seiten Edge728
U.com QuaVde-CrhyaHninghel-SEpCeLedDeDlauyalL- iannedsHIGH-PERFORMANCE PRODUCTS – ATE
t4Description
Features
SheeThe Edge728 is a quad delay and deskew element.
taManufactured in a high performance bipolar process, it is
adesigned primarily for channel deskew applications in
.DMemory Test Equipment.
wwThe part offers a full scale delay range of ≥ 8.0 ns with
windependent ± 750 ps adjustment of the falling edge.
mThe Edge728 has a drive mode, where one input signal
ois routed to all of the outputs. This mode is particularly
useful in a fanout application.
• Pin and Functionally Compatible with the Edge 628
and Edge624 in Modes 0 and 2
• Independent Delay Adjustments for Positive and
Negative Transitions
• Fanout Mode for One Input Distributed to All
Channels
• 44-pin MQFP Package with Internal Heat Spreader,
44-pin PLCC with Internal Heat Spreader, or
Die Form
.cThe delay value (and resolution) is controlled via an external Functional Block Diagram
Uvoltage DAC.
t4This deskew element is designed specifically to be
monotonic and stable while delaying a very narrow pulse
eover a wide delay range.
DRVMODE
S1
eThe Edge728 is a pin and functionally compatible upgrade
hto the Edge628 with the following differences:
• greater net usable delay range
S• greater net usable falling edge
taadjustment range
• only one external bias resistor required
• only one external compensation capacitor required
.DaApplications
IN1
IN1*
IN2
IN2*
OUT1
OUT1*
VDELAY1
VWIDTH1
OUT2
OUT2*
VDELAY2
VWIDTH2
ww• Automatic Test Equipment
w .com• Memory Tester Drive On Channel Deskew
IN3 OUT3
IN3*
OUT3*
VDELAY3
VWIDTH3
t4UIN4 OUT4
eeIN4*
OUT4*
ShVDELAY4
www.Data VWIDTH4
Revision 3 / February 18, 2002
1
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HIGH-PERFORMANCE PRODUCTS – ATE
Circuit Description (continued)
Programming Sequence
VDELAY, in addition to affecting the placement of the rising
edge, also affects the falling edge. Therefore, when
calibrating a system, VDELAY should be adjusted first. As
VWIDTH affects only the falling edge, it should be adjusted
only after VDELAY is established.
INPUT
OUTPUT
VWIDTH = Minimum VWIDTH = Maximum
TPDmin + Tspan
TPDmin + Tspan + Twidth
Figure 4. Mode 2 VDELAY and VWIDTH Controls
Edge728
IN1, IN1*
∆T
IN2, IN2*
∆T
IN3, IN3*
∆T
IN4, IN4*
∆T
VDELAY1
OUT1, OUT1*
VWIDTH1
VDELAY2
OUT2, OUT2*
VWIDTH2
VDELAY3
OUT3, OUT3*
VWIDTH3
VDELAY4
OUT4, OUT4*
VWIDTH4
Figure 5. Function Model in Mode 2
2000 Semtech Corp.
6
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6 Page HIGH-PERFORMANCE PRODUCTS – ATE
Package Information (continued)
44 Pin PLCC Package
0.045 x 45o
[1.143]
Pin #1
Pin #1 Ident
Pin #1 Ident
Edge728
0.690
[17.526]
SQ
0.654
[16.612]
SQ
0.045 x 45o
0.172
[4.368]
0.029
[0.736]
0.500
[12.70]
0.050
[1.27]
0.620
[15.748]
0.016
[0.406]
0.101
[2.565]
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.
2000 Semtech Corp.
12
www .semtech.com
12 Page | ||
Seiten | Gesamt 18 Seiten | |
PDF Download | [ EDGE728 Schematic.PDF ] |
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