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參數(shù)資料
| 型號： | ML65244CS |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 總線收發(fā)器 |
| 英文描述： | DUAL 4-BIT DRIVER, TRUE OUTPUT, PDSO20 |
| 封裝： | SOIC-20 |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 97K |
| 代理商： | ML65244CS |
ML65244/ML65L244
REV. 1.0 10/25/2000
5
FUNCTIONAL DESCRIPTION
The ML65244 and ML65L244 are very high speed non-
inverting buffer/line drivers with three-state outputs
which are ideally suited for bus-oriented applications.
They provide a low propagation delay by using an analog
design approach (a high speed unity gain buffer), as
compared to conventional digital approaches. The
ML65244 and ML65L244 follow the pinout and
functionality of the industry standard FCT244 series of
buffer/line drivers and are intended to replace them in
designs where the propagation delay is a critical part of
the system design considerations. The ML65244 and
ML65L244 are capable of driving load capacitances
several times larger than their input capacitance. They
are configured so that the Ai inputs go to the YAi outputs,
with the A side output enable controlled by 1G.
Similarly, 2G controls the Bi inputs which go to the YBi
outputs.
These unity gain analog buffers achieve low propagation
delays by having the output follow the input with a small
offset. The output rise and fall times will closely match
those of the input waveform. All inputs and outputs have
Schottky clamp diodes to handle undershoot or overshoot
noise suppression in unterminated applications. All
outputs have ground bounce suppression (typically
< 400mV), high drive output capability with almost
immediate response to the input signal, and low
output skew.
The IOL current drive capability of a buffer/line driver is
often interpreted as a measure of its ability to sink
current in a dynamic sense. This may be true for CMOS
buffer/line drivers, but it is not true for the ML65244 and
ML65L244. This is because their sink and source current
capability depends on the voltage difference between the
output and the input. The ML65244 can sink or source
more than 100mA to a load when the load is switching
due to the fact that during the transition, the difference
between the input and output is large. IOL is only
significant as a DC specification, and is 25mA.
ARCHITECTURAL DESCRIPTION
Until now, buffer/line drivers have been implemented in
CMOS logic and made to be TTL compatible by sizing
the input devices appropriately. In order to buffer large
capacitances with CMOS logic, it is necessary to cascade
an even number of inverters, each successive inverter
larger than the preceding, eventually leading to an
inverter that will drive the required load capacitance at
the required frequency. Each inverter stage represents an
additional delay in the gating process because in order
for a single gate to switch, the input must slew more than
half of the supply voltage. The best of these CMOS
buffers has managed to drive a 50pF load capacitance
with a delay of 3.2ns. Micro Linear has produced a dual
quad buffer/line driver with a delay less than 1.7ns by
using a unique circuit architecture that does not require
cascaded logic gates. The ML65244 uses a feedback
technique to produce an output that follows the input. If
the output voltage is not close to the input, then the
feedback circuitry will source or sink enough current to
the load capacitance to correct the discrepancy.
Figure 5. One buffer cell of the ML65244
Q1
IN
OUT
Q2
Q7
R2
R6
R5
GND
R4
Q4
Q3
R1
R8
R3
Q5
Q6
R7
VCC
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| ML65245CK | TTL/H/L SERIES, 8-BIT TRANSCEIVER, TRUE OUTPUT, PDSO20 |
| ML65541CK | TTL/H/L SERIES, 8-BIT DRIVER, TRUE OUTPUT, PDSO20 |
| ML65L541CK | TTL/H/L SERIES, 8-BIT DRIVER, TRUE OUTPUT, PDSO20 |
| ML65F16444CT | BICMOS SERIES, 16-BIT DRIVER, TRUE OUTPUT, PDSO48 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML65244CSX | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ML65245 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Speed Octal Buffer Transceivers |
| ML65245CK | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Speed Octal Buffer Transceivers |
| ML65245CS | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ML6553 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Bus Termination Regulator |
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