參數(shù)資料
型號: IDT82P2521BH
廠商: IDT, Integrated Device Technology Inc
文件頁數(shù): 110/147頁
文件大小: 0K
描述: IC LIU E1 21+1CH SHORT 640-PBGA
標(biāo)準(zhǔn)包裝: 5
類型: 線路接口裝置(LIU)
規(guī)程: E1
電源電壓: 3.135 V ~ 3.465 V
安裝類型: 表面貼裝
封裝/外殼: 640-BGA 裸露焊盤
供應(yīng)商設(shè)備封裝: 640-PBGA-EP(31x31)
包裝: 托盤
其它名稱: 82P2521BH
IDT82P2521
21(+1) CHANNEL HIGH-DENSITY E1 LINE INTERFACE UNIT
Functional Description
65
December 7, 2005
3.5.3
MCLK, MASTER CLOCK INPUT
MCLK provides a stable reference timing for the IDT82P2521. MCLK
should be a jitter-free1 clock with ±50 ppm accuracy. The clock
frequency of MCLK is set by pins MCKSEL[3:0] and can be N x 2.048
MHz with 1
≤ N ≤ 8 (N is an integer number). Refer to MCKSEL[3:0] pin
description for details.
If there is a loss of MCLK (duty cycle is less than 30% for 10 s), the
device will enter power down. In this case, both the receive and transmit
circuits are turned off. The pins on the line interface will be in High-Z
state. The pins on receive system interface will be in High-Z state or in
low level, as selected by the RHZ bit (b6, RCF0,...). The input on the
transmit system interface is ignored and the output on the transmit
system interface will be in High-Z state. Refer to Section 3.1.7 Receiver
If MCLK recovers after loss of MCLK the device will be reset auto-
matically.
3.5.4
XCLK, INTERNAL REFERENCE CLOCK INPUT
XCLK is derived from MCLK. For the respective channel, it is 2.048
MHz. XCLK is used as selectable reference clock for
pattern /AIS generation
RCLKn in LLOS
Loss of TCLKn to determine Transmit Output High-Z.
1. Jitter is no more than 0.001 UI.
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