- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384759 > MT8920B-1 (Mitel Networks Corporation) ISO-CMOS ST-BUS⑩ FAMILY ST-BUS Parallel Access Circuit PDF資料下載
參數(shù)資料
| 型號： | MT8920B-1 |
| 廠商： | Mitel Networks Corporation |
| 英文描述： | ISO-CMOS ST-BUS⑩ FAMILY ST-BUS Parallel Access Circuit |
| 中文描述： | 異意法半導(dǎo)體的CMOS總線⑩家庭圣總線并行訪問電路 |
| 文件頁數(shù)： | 15/24頁 |
| 文件大?。?/td> | 534K |
| 代理商： | MT8920B-1 |
CMOS
MT8920B
3-17
Connecting the STPA to a shared ST-BUS Line
The STPA’s STo0 and STo1 outputs cannot be
directly forced into a high impedance state.
However, with some external logic, the STo0 output
can be buffered by a three-state device, controlled by
the STo1 output. This application is only possible if
the Tx1 RAM and associated STo1 output are not
required for some other purpose.
Figure 13 shows an external buffer U1 controlled by
the STo1 output and an external Output Data Enable
(ODE) signal. When FF (hex) is written to the Tx1
RAM, the corresponding STo1 output channel goes
to logic high. This signal, AND-ed together with a
logic high at ODE, enables U1, resulting in the STo0
signal transparently passed to the output of U1.
When 00 (hex) is written to the Tx1 RAM, the STo1
output goes logic low. This disables U1, resulting in
a high impedance state at the output of U1,
corresponding to the selected channel.
This method of three-state buffering permits output
control on a per-channel or per-bit basis.
The ODE input is used to enable the ST-BUS outputs
after all ST-BUS devices are properly configured by
software. This eliminates the possibility of
contention on the ST-BUS lines during the power-up
state.
Figure 13 - Connecting STPA to a Common ST-BUS Line
Parallel Port
ODE
Parallel Port
STo0
STo1
MT8920B
MT8980
STi0
STi1
STi7
STo7
STo1
STo0
ODE
74HC125
74HC00
U1
ST-BUS
U2
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MT8920BC | ISO-CMOS ST-BUS⑩ FAMILY ST-BUS Parallel Access Circuit |
| MT8920BE | ISO-CMOS ST-BUS⑩ FAMILY ST-BUS Parallel Access Circuit |
| MT8920BP | ISO-CMOS ST-BUS⑩ FAMILY ST-BUS Parallel Access Circuit |
| MT8920BS | ISO-CMOS ST-BUS⑩ FAMILY ST-BUS Parallel Access Circuit |
| MT8926 | ISO-CMOS ST-BUS⑩ FAMILY T1 Performance Monitoring Adjunct Circuit (PMAC) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MT8920BC | 制造商:MITEL 制造商全稱:Mitel Networks Corporation 功能描述:ISO-CMOS ST-BUS⑩ FAMILY ST-BUS Parallel Access Circuit |
| MT8920BE | 制造商:Mitel Networks Corporation 功能描述:COMMUNICATIONS INTERFACE, 28 Pin, Plastic, DIP |
| MT8920BE1 | 制造商:Zarlink Semiconductor Inc 功能描述:ST-BUS PARALLEL ACCESS CIRCUIT 28PDIP - Rail/Tube 制造商:Microsemi 功能描述:Microsemi MT8920BE1 Interface Misc |
| MT8920BP | 制造商:Microsemi Corporation 功能描述: 制造商:MITEL 功能描述: |
| MT8920BP1 | 制造商:Microsemi Corporation 功能描述:ST-BUS PARALLEL ACCESS CIRCUIT 28PLCC - Rail/Tube 制造商:Zarlink Semiconductor Inc 功能描述:ST-BUS PARALLEL ACCESS CIRCUIT 28PLCC - Rail/Tube |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。