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EL1056CM Schematic ( PDF Datasheet ) - Elantec

Teilenummer EL1056CM
Beschreibung Monolithic High-Speed Pin Driver
Hersteller Elantec
Logo Elantec Logo 




Gesamt 16 Seiten
EL1056CM Datasheet, Funktion
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






EL1056CM Datasheet, Funktion
EL1056AC EL1056C
Monolithic High-Speed Pin Driver
Typical Performance Curves Contd
Propagation Delay Change
with Die Temperature
Change in Propagation Delay
with Power Supply Headroom
Output Edge Dispersion vs
Temperature
1056 – 12
Edge Dispersion vs ISR
1056 – 13
Minimum Output Pulse Width
1056 – 14
Output Offset vs ISR
1056 – 15
1056 – 16
6
1056 – 17

6 Page









EL1056CM pdf, datenblatt
EL1056AC EL1056C
Monolithic High-Speed Pin Driver
Applications Information Contd
load currents must be limited to 60 mA Short-
circuits can rapidly destroy the EL1056 although
the part will survive for 20 ms periods If there is
the possibility of output load fault the overcur-
rent sense circuitry should be used to signal
alarm to the controlling system which should ul-
timately activate the tristate mode to relieve the
output stage Driving large static currents also
raises internal dissipation and should be part of
the thermal budget
The collectors of the output transistors are con-
nected to the Shunt terminals and the output
stage drivers’ collectors are connected to the Ba
and Bb terminals (see Figure 4) The Shunt
lines can have transient currents as high as
120 mA and are separated from the Va and Vb
terminals to keep switching noise out of the con-
trol and logic circuitry A bypass capacitor
should be connected to the Ba and Bb termi-
nals
Figure 4 Output Stage in Normal Mode
12
1056 – 29

12 Page





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