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PDF EL1056ACM Data sheet ( Hoja de datos )
| Número de pieza | EL1056ACM | |
| Descripción | Monolithic High-Speed Pin Driver | |
| Fabricantes | Elantec | |
| Logotipo |  |
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EL1056AC EL1056C
Monolithic High-Speed Pin Driver
Features
Wide g12V output levels
250 ps dispersion
3 ns delay times
1V ns slew rate adjustable
Low overshoot and aberrations in
50X systems
3-state output
Power-down mode reduces
output leakage to nanoamperes
Overcurrent sense flag available
to protect internal output devices
Buffered analog inputs
Differential logic inputs are
compatible with ECL TTL and
CMOS
Applications
Memory testers
ASIC testers
Functional board testers
Analog digital incoming
component verifiers
Logic emulators
Ordering Information
Part No Temp Range Package Outline
EL1056CM 0 C to a75 C
24-Lead MDP0027
Thermal SOL
EL1056ACM 0 C to a75 C
24-Lead MDP0027
Thermal SOL
General Description
The EL1056 is designed to drive high-quality test signals into
close or terminated loads It has a dispersion of 250 ps or less
whether due to signal size or direction of edge It can output a
very wide 24V output span encompassing all logic families as
well as analog levels The EL1056 is fabricated in Elantec’s ox-
ide isolated process which eliminates the possibility of latch-up
and provides a very durable circuit
The output can be turned off in two ways the OE pins allow
the output to be put in a high-impedance state which makes the
output look like a large resistance in parallel with 3 pF even for
back-driven signals with as much as 2 5V ms slew rate The E
pins put the output in an even higher impedance state guaran-
teed to 150 nA leakage in the EL1056A This allows accurate
measurements on the bus without disconnecting the EL1056
with a relay
The EL1056 incorporates an output current sense which can
warn the system controller that excessive output current is
flowing The trip point is set by two external resistors
Connection Diagram
24-Lead Thermal SOL Package
and Heat-spreader
Top View
1056 – 1
Note All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication however this data sheet cannot be a ‘‘controlled document’’ Current revisions if any to these
specifications are maintained at the factory and are available upon your request We recommend checking the revision level before finalization of your design documentation
1993 Elantec Inc
1 page  
EL1056AC EL1056C
Monolithic High-Speed Pin Driver
Typical Performance Curves
10V CMOS TTL and ECL
Outputs into 550X Load
CMOS and ECL Outputs As Seen
at the End of an Unterminated
Cable Backmatched at Driver
CMOS Output at ISR e 100 mA
200 mA 400 mA and 1000 mA
1056 – 6
Output Slewrate vs ISR
(Two Samples)
1056 – 7
Propagation Delay vs ISR
1056 – 8
Output Slewrate vs
Die Temperature
1056 – 9
1056 – 10
5
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5 Page 
EL1056AC EL1056C
Monolithic High-Speed Pin Driver
Applications Information Contd
Figure 3 Output Stage Circuit in Tristate Mode
1056 – 28
Output Stage–Normal Mode
Capacitive loads can cause the output stage to
ring Little ringing occurs for loads less than
25 pF but substantial ringing for more than
40 pF Terminated transmission lines cause no
ringing and actually suppress it as a snubber
does A terminated line draws heavy DC current
however and greatly raises dissipation
Driving a back-terminated line also causes little
ringing and does not cause DC dissipation The
series matching resistor between the EL1056 out-
put and a back-terminated line also serves to iso-
late the driver from capacitive loads and short-
circuits The slewrate of the driver slows by
about 10% when driving a 50X back-matched
line as seen at the end of the line The snubber
can be on either side of the back-match resistor
When placed on the line side it creates a high-
frequency termination for the line when the
driver is tristated but it slows the output small-
signal risetime by about 10% (although not slew-
rate) When placed on the driver side of the back-
match resistor no speed reduction occurs in
normal mode but the cable is more poorly termi-
nated in tristate
The transient currents that occur when driving
capacitive or back-matched loads can be very
high approaching 100 mA The driver is capable
of outputting a peak of 140 mA but long-term
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet EL1056ACM.PDF ] | |
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