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参数资料
| 型号： | EL1056CM |
| 英文描述： | Monolithic High-Speed Pin Driver |
| 中文描述： | 单片高速管脚驱动 |
| 文件页数： | 2/16页 |
| 文件大小： | 311K |
| 代理商： | EL1056CM |
EL1056ACEL1056C
Monolithic High-Speed Pin Driver
Applications Information
Contd
The ISR pin is connected to the emitter of a PNP
transistor whose base is biased a diode below
ground (see Figure 2) Thus the ISR input looks
like a low impedance for positive input currents
and is biased close to ground A protection diode
absorbs negative currents and the input PNP
will not conduct In power-down mode the PNP
releases its current sink and the external circuit
must not present more than 6V to the disabled
ISR input or emitter-base damage to the NPN
will occur within the driver A signal diode or
zener can be used to clamp the ISR input for posi-
tive input voltages if the voltage on the ISR resis-
tor is potentially greater than 6V when the driver
is in power-down mode
Output Stage – Tristate Mode
In tristate mode (OE low) the output transistors
have their emitter-base junctions reverse-biased
by a diode voltage This turn-off voltage is in fact
provided by an internal buffer whose input is
connected to the output pin (see Figure 3) Tran-
sistors Q1 – Q4 form the output buffer in normal
mode The tristate mode buffer Q5 – Q8 replicates
externally impressed voltages from the output
pin onto the internal schottky switch node They
also turn off Q1 – Q4 by a reverse diode voltage
between bases and emitters
effectively boot-
strapping the internal voltages so that no tran-
sistor’s base-emitter junction is reverse-biased by
a damaging potential Another benefit is that the
capacitance seen at the output in tristate mode is
reduced
Because the tristate buffer’s input is connected to
the output terminal the output is quite ‘‘alive’’
during tristate For instance the input bias cur-
rent of the buffer is seen as the tristate ‘‘leakage’’
and its variation with applied voltage becomes
tristate input impedance
The tristate input current is like a current source
and it can drag an output to unpredictable volt-
ages It is not a danger to connect a tristated out-
put that has drifted to say b6V to a logic pin of
a device to be tested The tristate output current
will simply comply with whatever voltage the
connected part normally establishes
The tristate input impedance is also quite active
over frequency The output can oscillate when
presented with resonant or inductive impedances
To prevent this a snubber should be connected
from output to ground consisting of a resistor in
series with a small capacitor The snubber can
also reduce the reflections of the coaxial line
when driven from the far end since the line ap-
pears to have an open termination during tri-
state Typical values for the resistor are 50
X to
75
X and 12 pF to 22 pF for the series capacitor
The effect of the snubber is to ‘‘de-Q’’ resonances
at the output
1056 – 27
Figure 2 ISR Pin Circuitry
10
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