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Details, datasheet, quote on part number:YTD439-S
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| Part: | YTD439-S |
| Category: | Communication => ISDN |
| Description: | Small Package With Both Dsu (U Point) And Terminal (S/T Point) Functions |
| Company: | Yamaha Corporation of America |
| Datasheet: | Download YTD439-S datasheet File size : 184 kB |
| Request For quote: | Find where to buy YTD439-S
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Datasheet text preview:
YTD439
ISTU
ISDN BRI controller for Terminal Equipment with built-in DSU
Abstract
YTD439 is a LSI that integrates in a single chip all the communication functions that are necessary for constructing an ISDN terminal with a built-in DSU. The functions of both the DSU (U reference point) and terminal (S/T reference point) are packed into the 100-pin SQFP chip allowing miniaturization of the terminal equipment. YTD439 has a built-in TD switch function that is necessary for controlling the connection of the B-channel data. By connecting an external CPU, memory, and CODEC, a terminal with a built-in DSU can be configured. In addition, YTD439 has a function that reduces the power consumption by stopping the functions of unused blocks. This is effective for battery-driven terminals.
Features
DSU block · Conforms to TTC Standards JT-I430 and JT-G961. · LT (line termination) function and CT (circuit termination) function. · DSU can be disconnected. S/T reference point driver/receiver block · Transition to the sleep state possible by setting an I/O register. CPU interface block · 8-bit or 16-bit data bus selectable. · I/O access through registers.
YTD439 CATALOG CATALOG No.:4TD439A2 2001.1
Layer 1 control block · Frame assembling and disassembling function. · I430 TTL output pin Layer 2 control block · Built-in LAPD protocol (supports four links). · Call control and D-channel packet function. Layer 3 interface block · Message exchange through I/O access (large 1088-byte FIFO). B channel HDLC controller · Supports CRC-CCITT and CRC-32. · 128k/64k/56k rate adaption B channel transparent · Supports PIAFS 64k/32k. · Flexible rate adaption function. B channel DATA FIFO · Transmission and reception: 128-byte FIFO × 2 channels. TD switch · Switch circuit for 8 channels of B channel data. · 512 k to 2,048 kHz PCM highway. Others · Terminal block can be disconnected. Power can be cut off. · Terminal block sleep mode. · Power supply to the analog block: +5 V. Power supply to the digital block: +5 V or 3.3 V. · 5 V tolerant I/O pin · 100-pin SQFP.
Applications
· Terminal adapter · Remote router · ISDN telephone · ISDN home telephone · ISDN Facsimile
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Functional Comparison of YAMAHA ISDN LSIs
Function DSU Function Layer 1 Layer 2 TTC Standard TTC Standard TTC Standard JT-G961 JT-I430 JT-Q920 JT-Q921 1993 edition YTD421 YTD428 1997 edition 1993 edition 1993 edition 1993 edition 1997 edition 1993 edition 1998 edition YTD423 YTD436 YTD439 1997 edition 1997 edition 1993 edition 1998 edition
ETSI ETS 300 012, ETS 300 125 North American Switches National ISDN-1/2, AT&T 5ESS, Nortel DMS-100 S/T Ref. Point Analog Driver/Receiver Circuit switching Maximum D Channel Links Dch Packet Switching (Teleaction communication) D Channel Layer 3 Data Transfer Method HDLC Controller for B Channel Data
External [YTD421] 2 2
2 2 (2)
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2 2 (2) I/O Transfer
DMA Transfer DMA Transfer
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I/O Transfer
I/O Transfer External DMA Transfer
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DMA Transfer
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I/O Transfer
B Channel Data Transfer Method
I/O Transfer B Channel Internal Clock Mode (kHz) B Channel External Clock Mode TD Switch Clock Output Function for CPU Signal Output Function for Testing +5 Power Supply (V) 5-V Tolerant I/O pin Package Note 1: DMA transfer: Request function only I/O transfer: 4-byte FIFO Note 2: Digital power supply only
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I/O Transfer (Note 1) 32, 56, 64
32, 56, 64
+5 +5
+5
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+5
or
+3.3 (Note 2)
+3.3 (Note 2) +3.3 (Note 2)
20-pin SSOP 100-pin SQFP 100-pin SQFP 100-pin SQFP 100-pin SQFP
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