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参数资料
| 型号： | AN1672 |
| 厂商： | ON SEMICONDUCTOR |
| 英文描述： | The ECL Translator Guide |
| 中文描述： | 翻译的ECL指南 |
| 文件页数： | 7/10页 |
| 文件大小： | 64K |
| 代理商： | AN1672 |
AN1672/D
http://onsemi.com
7
From LVPECL to CMOS
Translation from LVPECL to CMOS will be similar to
“PECL to CMOS” and that prior segment should be
reviewed. The receiver input common mode range
maximum must be sufficient to allow proper recognition of
LVPECL HIGH levels (>2.2 V), thus allowing proper
translation.
The LVPECL to CMOS translation is accomplished
through two stages, first LVPECL to LVTTL, then from
LVTTL to CMOS. Final stage devices may any of the HCT
type devices (i.e., MC74HCT245A), or ACT (i.e.,
MC74ACT244).
From LVNECL to TTL
MC100ELT25 will translate from LVNECL to TTL. Note
the V
IHCMR
minimum is V
EE
+ 2.2 V. If a 3.3 V supply is
available for the MC100EPT25, this device will translate
LVNECL to TTL, reaching a V
OH
of greater than 2.4 V up
to 250 MHz.
From LVNECL to LVTTL/LVCMOS
MC100EPT25 will translate from LVNECL to
LVTTL/LVCMOS.
From LVNECL to CMOS
Use a first stage of MC100ELT25 (or MC100EPT23 if a
3.3 V supply is available) and then use a final stage device
of an appropriate HCT (i.e., MC74HCT245A) or ACT (i.e.,
MC74ACT244).
From NECL to TTL
Several devices are offered for translation signals from
NECL mode drivers to 5 V supplied TTL receivers, but the
MC10H125 is the standard translator. Special advantages
may be realized with the MC10H6xx series devices. Review
the device data sheets for specific devices features.
The MC10H125 operates over the frequency range from
DC to about 50 MHz, although operation is possible
>80 MHz with diminished output swing (reduced V
OH
levels) with higher frequency. Open, floating differential
inputs on a gate may allow the device to spontaneously auto
oscillate unless provisions are taken to prevent the inputs
from converging. An external network may be used to force
a default state on the outputs when the inputs are open. Use
a 50 k pulldown on the noninverting input, then a 50 k
pullup and a 50 k pulldown on the inverting input.
If a 3.3 V V
CC
is available, the MC100EPT25 may be used
on this supply to receive NECL and drive a TTL receiver.
The MC100EPT25 V
OH
will be limited to about 2.6 V at
lower frequencies, decreasing at higher frequencies to 1.6 V
V
OH
, at 550 MHz (see data sheet). These may be sufficient
levels for a TTL receiver.
From NECL to LVTTL/LVCMOS
MC100EPT25
will
translate
LVTTL/LVCMOS.
From NECL to CMOS
Use a MC100EPT25 to translate from NECL to
LVTTL/LVCMOS, and then any of the HCT type devices
(i.e., MC74HCT245A), or ACT (i.e., MC74ACT244) to
boost the levels to CMOS.
from
NECL
to
相关PDF资料 |
PDF描述 |
|---|---|
| AN1672D | The ECL Translator Guide |
| AN1687 | A FULL-FEATURED WIRELESS INTERFACE FOR RS-232 COMMUNICATIONS |
| AN1812 | Freescale Semiconductor, Inc. |
| AN2001 | Designing Expansion Boards |
| AN211A | FIFELD EFFECT TRANSISTORS IN THEORY AND PRACTICE |
相关代理商/技术参数 |
参数描述 |
|---|---|
| AN1672D | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:The ECL Translator Guide |
| AN1673.0 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Application Circuit to Generate Plus |
| AN1687 | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:A FULL-FEATURED WIRELESS INTERFACE FOR RS-232 COMMUNICATIONS |
| AN1690.0 | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:Electronics Meets the Challenges of Patient Monitors |
| AN16903A | 制造商:PANASONIC 制造商全称:Panasonic Semiconductor 功能描述:IC for sound multiplex demodulation in NTSC (Japanese TV mode) |
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