ITT - Index of

ITT7520
SENSE AMPLIFIERS
Sense-input Termination Resistor
Considerations
Termination resistors are intentionally omitted
from the sense-input terminals so the desigller
may select resistor values which will be compatible
with the particular application. Matched
termination resistors, (RT, Figure H), normally
in the range of 25 n to 200 n each, are required
not only to terminate the sense line in
a desired impedance but also to provide a
doc path for the sense-input bias currents.
Careful matching of the resistor pairs should
be observed or effective common-mode rejection
will be reduced.
Output Drive Capability
Figure H
The output circuits of these sense amplifiers
feature the ability to sink or supply load current.
This capability permits direct use with
both TTL- and DTL-type loads. The open-collector
output of the ITT1522/1TT7523 circuit
may be connected to similar outputs to perform
the wire-AND function. Load currents (out
of the output terminal) are specified as negative
values. Arrows on the doc test circuit indicate
the actual direction of current flow.
Logic Input Current Requirements
Logic input current requirements are specified
at worst-case power-supply conditions over the
operating free-air temperature range ofO°C
to 70°C. The logic input currents are identical.
to and compatible with TTL digital integrated
circuits. Each logic input of •. the multipleemitter
input transistors reqolres no more
than a 1.6-mA flow out of the inputata
low logic level. Each input .emitterrequires
current into the input when it is at a highlogic
level. This current is 40 vA maximum.
current into the input terminals are specified .
as positive values. Ar~ows on tlie doc test circuits
indicate the actual direction 01.' current
flow.
Absolute Maximum Ratings (over free-air
temperature range unless otherwise noted)
Supply voltages (see Note 1): . . '.
Vcc+ ........ ; ••...••.•.•.........•.• 7V
Vcc- ..................•....•.... ; .• -7V
Differential input voltage, VrD or Vr~£ ...... ±5V
Voltage from any input to ground
(see Note 2) ........................ 5.5V
Operating free-air temperature '.'
range, TA ...........•..•.•. C·C to 70·C
Storage temperature range, T.te.-,55·C to 150·C
Recommended Operating Conditions
Min ~om' Max Unit
Vcc+ (see Note 1).... 4.75 5 5.25 V
Vcc - (see Note 1) ....-4.75 -5 -5~25, V
V ref ••••••.••••••••• 15 , 40mV'
NOTES:
1. These voltage values are ,with' respect to
network ground terminal.
2. Strobe and gate input voltages must be,
zero or positive with respect to'network.ground
terminal.
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