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參數(shù)資料
| 型號(hào)： | ML65245 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | High Speed Octal Buffer Transceivers(高速八通道緩沖收發(fā)器) |
| 中文描述： | 八路高速緩沖收發(fā)器（高速八通道緩沖收發(fā)器） |
| 文件頁數(shù)： | 5/10頁 |
| 文件大?。?/td> | 109K |
| 代理商： | ML65245 |
ML65245
**
/ML65L245
*
REV. 1.0 10/25/2000
5
FUNCTIONAL DESCRIPTION
The ML65245 and ML65L245 are very high speed non-
inverting transceivers 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 ML65245 and
ML65L245 follow the pinout and functionality of the
industry standard FCT245 series of transceivers and are
intended to replace them in designs where the
propagation delay is a critical part of the system design
considerations. The ML65245 and ML65L245 are capable
of driving load capacitances several times larger than
their input capacitance. They are configured so that
signals pass from Ai to Bi, or from Bi to Ai, depending on
the state of the T/
R
pin. All of the signal lines can be
made high impedance via the
OE
pin.
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 I
OL
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 ML65245 and
ML65L245. This is because the their sink and source
current capability depends on the voltage difference
between the output and the input. The ML65245 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. I
OL
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 an octal
transceiver with a delay less than 1.7ns by using a unique
circuit architecture that does not require cascaded logic
gates. The ML65245 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 ML65245
Q1
IN
OUT
Q2
Q7
R2
R6
R5
GND
R4
Q4
Q3
R1
R8
R3
Q5
Q6
R7
VCC
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ML65L245 | High Speed Octal Buffer Transceivers(高速八通道緩沖收發(fā)器) |
| ML6553CS-1 | ; Leaded Process Compatible:Yes RoHS Compliant: Yes |
| ML6553 | Bus Termination Regulator |
| ML65541 | High Speed Octal Buffer/Line Drivers(高速八通道緩沖收發(fā)器) |
| ML65L541 | High Speed Octal Buffer/Line Drivers(高速八通道緩沖收發(fā)器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| ML6553CS1 | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 Bus Termination RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| ML6553CS-1 | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Bus Termination Regulator |
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