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參數(shù)資料
型號(hào): DS21Q44T+
廠商: Maxim Integrated Products
文件頁數(shù): 1/105頁
文件大小: 0K
描述: IC FRAMER ENHANCED E1 4X 128TQFP
標(biāo)準(zhǔn)包裝: 72
控制器類型: E1 調(diào)幀器
接口: 并行/串行
電源電壓: 2.97 V ~ 3.63 V
電流 - 電源: 75mA
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 128-LQFP
供應(yīng)商設(shè)備封裝: 128-LQFP(14x20)
包裝: 管件
1 of 105
062602
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.
FEATURES
§ Four E1 (CEPT or PCM-30)/ISDN-PRI
framing transceivers
§ All four framers are fully independent;
transmit and receive sections of each framer
are fully independent
§ Frames to FAS, CAS, CCS, and CRC4 formats
§ Each of the four framers contain dual two-
frame elastic store slip buffers that can
connect to asynchronous backplanes up to
8.192MHz
§ 8-bit parallel control port that can be used
directly on either multiplexed or
nonmultiplexed buses (Intel or Motorola)
§ Easy access to Si and Sa bits
§ Extracts and inserts CAS signaling
§ Large counters for bipolar and code
violations, CRC4 code word errors, FAS
word errors, and E-bits
§ Programmable output clocks for Fractional
E1, per channel loopback, H0 and H12
applications
§ Integral HDLC controller with 64-byte buffers
configurable for Sa bits or DS0 operation
§ Detects and generates AIS, remote alarm,
and remote multiframe alarms
§ Pin compatible with DS21Q42 enhanced
quad T1 framer
§ 3.3V supply with 5V tolerant I/O; low-power
CMOS
§ Available in 128-pin TQFP package
§ IEEE 1149.1 support
FUNCTIONAL DIAGRAM
Receive
Framer
Elastic
Store
Transmit
Formatter
Elastic
Store
FRAMER #0
FRAMER #1
FRAMER #2
FRAMER #3
Control Port
ACTUAL SIZE
QUAD
E1
FRAMER
ORDERING INFORMATION
DS21Q44T
0°C to +70°C
DS21Q44TN
-40°C to +85°C
DESCRIPTION
The DS21Q44 E1 is an enhanced version of the DS21Q43 quad E1 framer. The DS21Q44 contains four
framers that are configured and read through a common microprocessor-compatible parallel port. Each
framer consists of a receive framer, receive elastic store, transmit formatter, and transmit elastic store. All
four framers in the DS21Q44 are totally independent; they do not share a common framing synchronizer.
The transmit and receive sides of each framer are also totally independent. The dual two-frame elastic
stores contained in each of the four framers can be independently enabled and disabled as required. The
www.maxim-ic.com
DS21Q44
Enhanced Quad E1 Framer
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