參數(shù)資料
型號(hào)： MC145572AAC
廠商： Freescale Semiconductor
文件頁數(shù)： 20/52頁
文件大?。?/td> 0K
描述： IC TRANSCEIVER ISDN 44-LQFP
標(biāo)準(zhǔn)包裝： 160
類型： 收發(fā)器
規(guī)程： RS232
電源電壓： 5V
安裝類型： 表面貼裝
封裝/外殼： 44-LQFP
供應(yīng)商設(shè)備封裝： 44-LQFP（10x10）
包裝： 托盤
MC145572EVK
28
2.6.2
LT Signal Header (JP26) Pin Descriptions
LTFREF: U1 Frequency Reference.
This is the signal at the FREQREF pin of the LT side MC145572, U1.
EXTREF: External Reference.
When DIP switch S2-1, RFon-RFoff is in the RFoff position, an external 8 kHz frequency reference applied
to this pin becomes the reference clock for the LT side MC145572, U1.
LTSCPEN: SCP Enable (LT U-Interface Transceiver SCP EN).
This signal, when held low, selects the Serial Control Port (SCP) for the transfer of control, status, and
data information into and out of the MC145572 U-Interface Transceiver on the LT side (U1).
SCPCLK: SCP Clock (SCP CLK).
SCPCLK is used for controlling the transfer of data into and out of the SCP registers of the U chips and
the S/T chip. Data is shifted into the device from SCPRx on rising edges of SCPCLK. Data is shifted out
of the device from SCPTx on falling edges of SCPCLK. SCPCLK can be any frequency up to 4.096 MHz.
SCPTx: SCP Transmit Output (SCP Tx).
SCPTx is used to output control, status and data information from the two MC145572 U-Interface
Transceivers and the MC145574 S/T-Interface Transceiver.
Table 2-4. LT Signal Header (JP9) Quick Reference
Pin No.
Silkscreen
Functional Description
2 20
EVEN
GND
Ground
1
LTFREF
Output for 8 kHz Reference Clock
3
EXTREF
Input for External 8 kHz Reference Clock
5
7
9
LTSCPEN
SCP Enable (LT U-Interface Transceiver)
11
SCPCLK
SCP Clock
13
SCPTx
SCP Transmit Output from MC145572s
15
SCPRx
SCP Receive Input to MC145572s
17
LTIRQ
Interrupt Request 2 (LT U-Interface Transceiver)
19
LTIDLCLK
IDL Clock 2 (LT U-Interface Transceiver)
21
LTIDLRX
IDL Receive Input (LT U-Interface Transceiver)
23
LTIDLTX
IDL Transmit Output (LT U-Interface Transceiver)
25
LTFSR
FSR Frame Sync (LT U-Interface Transceiver)
27
LTFSX
FSX Frame Sync (LT U-Interface Transceiver)
29
8 KHz
Output for On-Board 8 kHz Reference Clock
31
LTSFAR
Receive Superframe Alignment (LT U-Interface Transceiver)
33
LTSFAX
Transmit Superframe Alignment (LT U-Interface Transceiver)
35
37
LTFREFO
Synchronized Recovered Clock Output When in GCI Mode of Operation (LT U-Interface Transceiver)
39
LTGTCLK
Demultiplexed Time Slot Clock Out (LT U-Interface Transceiver)
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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