參數(shù)資料
型號： MC145574
廠商： Motorola, Inc.
英文描述： ISDN S/T-Interface Transceiver
中文描述： 綜合業(yè)務數(shù)字網(wǎng)S / T的接口收發(fā)器
文件頁數(shù)： 107/164頁
文件大小： 1072K
代理商： MC145574
MC145574
13–1
MOTOROLA
The MC145574 can be configured in several different modes for different applications. The following
sections describe the various configurations available for the NT and TE modes.
To select NT mode, the TE/NT pin must be held low. The NT device can operate in a mixture of different
configurations. How each aspect of the NT’s operation is selected is discussed separately in the follow-
ing sections. However, for a broad view of the NT’s various flavors, the NT family tree is shown in
Figure 13–1.
Figure 13–1. NT Family Tree
NT
FIXED TIMING
ADAPTIVE TIMING
SLAVE
MASTER
SLAVE
MASTER
NT TERMINAL
NT1 STAR
NT TERMINAL
NT1 STAR
NT TERMINAL
NT1 STAR
NT TERMINAL
NT1 STAR
NT (NORMAL MODE)
NT (NORMAL MODE)
NT (NORMAL MODE)
NT (NORMAL MODE)
# !"
The receiver/demodulator of the NT can operate in two different modes depending on the type of
loop that the device is connected to. These modes are called fixed and adaptive timing modes. The
mode of operation is chosen by the state of Pin 6. When this pin is held low the device is in adaptive
mode, and when held high the device is in fixed timing mode. The choice of mode is dependent on
the loop characteristics, and the intention is that fixed timing should be used for short passive bus
configurations and adaptive timing used for all others. However, the performance of the timing recovery
circuit employed in the MC145474/75, and also in the MC145574, allows the use of adaptive timing
in all loop configurations. Thus, it is recommended that adaptive timing be used in all configurations.
It is also possible to select fixed timing mode via the SCP/GCI control bit OR8(2). The FIX pin is inter-
nally OR’d with this SCP/GCI bit, and one should note that in the NT Terminal mode, this is the only
way to select fixed timing. The FIX pin should be held low if register programming is to be used.
! "
In NT mode, the IDL2/GCI interface can be selected either as a master or a slave. This selection
is done via Pin 5. When Pin 5 is held low, slave mode is selected. When it is held high, master mode
is selected.
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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MC145574AAC 功能描述:IC TRANSCEIVER ISDN 32-LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標準包裝:1,000 系列:- 類型:收發(fā)器 驅(qū)動器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR)
MC145574AACR2 功能描述:IC TRANSCEIVER ISDN 32-LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標準包裝:1,000 系列:- 類型:收發(fā)器 驅(qū)動器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR)
MC145574ADW 功能描述:IC TRANSCEIVER ISDN 28-SOIC RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標準包裝:1,000 系列:- 類型:收發(fā)器 驅(qū)動器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR)
MC145574ADWR2 功能描述:IC TRANSCEIVER ISDN 28-SOIC RoHS:否 類別:集成電路 (IC) >> 接口 - 驅(qū)動器，接收器，收發(fā)器 系列:- 標準包裝:1,000 系列:- 類型:收發(fā)器 驅(qū)動器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR)
MC145574AEG 制造商:Freescale Semiconductor 功能描述:
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