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SN74F1016DWR Fiches technique(PDF) 3 Page - Texas Instruments

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No de pièce SN74F1016DWR
Description  16-BIT SCHOTTKY BARRIER DIODE R-C BUS-TERMINATION ARRAY
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SN74F1016DWR Fiches technique(HTML) 3 Page - Texas Instruments

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SN74F1016
16-BIT SCHOTTKY BARRIER DIODE
R-C BUS-TERMINATION ARRAY
SDFS093 – NOVEMBER 1992 – REVISED DECEMBER 1993
2–3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
Large negative transients occurring at the inputs of memory devices (DRAMs, SRAMs, EPROMs, etc.) or on the
CLOCK lines of many clocked devices can result in improper operation of the devices. The SN74F1016 diode
termination array helps suppress negative transients caused by transmission line reflections, crosstalk, and switching
noise.
Diode terminations have several advantages when compared to resistor termination schemes. Split resistor or
Thevenin equivalent termination can cause a substantial increase in power consumption. The use of a single resistor
to ground to terminate a line usually results in degradation of the output high level, resulting in reduced noise immunity.
Series damping resistors placed on the outputs of the driver will reduce negative transients, but they can also increase
propagation delays down the line, as a series resistor reduces the output drive capability of the driving device. Diode
terminations have none of these drawbacks.
The operation of the diode arrays in reducing negative transients is explained in Figure 1. The diode conducts current
whenever the voltage reaches a negative value large enough for the diode to turn on. Suppression of negative
transients is tracked by the current-voltage characteristic curve for that diode. A typical current voltage for the
SN74F1016 is shown in Figure 1.
The maximum effectiveness of the diode arrays in suppressing negative transients occurs when they are placed at
the end of a line and/or the end of a long stub branching off a main transmission line. The diodes can also be used
to reduce the negative transients that occur due to discontinuities in the middle of a line. An example of this is a slot
in a backplane that is provided for an add-on card.
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
VF – Forward Voltage – V
TA = 25°C
Variable 1:
VIN
– Ch1
Linear Sweep:
Start
0.000 V
Stop
– 2.000 V
Step
– 0.010 V
Constants:
VHI
–Vs1
3.5000 V
VLO –Vs2
0.0000 V
– 100
–90
–80
–70
–60
–50
–40
–30
–20
–10
0
DIODE FORWARD CURRENT
vs
DIODE FORWARD VOLTAGE
Figure 1


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