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DS21Q44
Enhanced Quad E1 Framer
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Status
All versions are No Longer Available.
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 device fully meets all of the latest E1 specifications including CCITT/ITU G.704, G.706, G.962, and I.431 as well as ETS 300 011 and ETS 300 233.
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Data Sheet
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Key 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 twoframe 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
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Diagram
Functional Diagram
Application Notes
Product Guides
Reliability Reports
Software/Models
Ordering Information
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Part Number
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Free
Sample |
Buy |
Status
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| DS21Q44T
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N/A |
No Longer Available |
LQFP;128 pin;359.6 mm²
Outline Drawing:21-0086 (PDF)
Land Pattern: 90-0143 (PDF)
Use pkgcode/variation: C128L-2*
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0°C to +70°C
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RoHS/Lead-Free: No
Materials Analysis |
| DS21Q44T+
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N/A |
No Longer Available |
LQFP;128 pin;359.6 mm²
Outline Drawing:21-0086 (PDF)
Land Pattern: 90-0143 (PDF)
Use pkgcode/variation: C128L+2*
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0°C to +70°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| DS21Q44TN
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N/A |
No Longer Available |
LQFP;128 pin;359.6 mm²
Outline Drawing:21-0086 (PDF)
Land Pattern: 90-0143 (PDF)
Use pkgcode/variation: C128L-2*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
Notes:
- Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
- Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
- Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
- * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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Information Index
Rev 1;
2002-06-26
This page last modified: 2009-10-21
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