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82C237 Datasheet(PDF) 1 Page - Intersil Corporation |
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82C237 Datasheet(HTML) 1 Page - Intersil Corporation |
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4-148 March 1997 82C237 CMOS High Performance Programmable DMA Controller Features • Fully Compatible with Intersil 82C37A - 82C237 May be Used in 8MHz and 12.5MHz 82C37A Sockets • Optimized for 10MHz and 12.5MHz 80C286 Systems • Special Mode Permits 16-Bit, Zero Wait State DMA Transfers • High Speed Data Transfers: - Up to 6.25MBytes/sec with 12.5MHz Clock in Normal Mode - Up to 12.5MBytes/sec with 12.5MHz Clock in 16-Bit Mode • Compatible with the NMOS 8237A • Four Independent Maskable Channels with Autoinitial- ization Capability • Cascadable to any Number of Channels • Memory-to-Memory Transfers • Static CMOS Design Permits Low Power Operation - ICCSB = 10 µA Maximum - ICCOP = 2mA/MHz Maximum • Fully TTL/CMOS Compatible • Internal Registers may be Read from Software Description The 82C237 is a modified version of the 82C37A. The 82C237 is fully software and pin for pin compatible with the 82C37A but provides an additional mode for 16-bit DMA transfers, as well as enhanced speed. Each channel may be individually programmed for 8-bit or 16-bit data transfers. The 82C237 controller can improve system performance by allowing external devices to transfer data directly to or from system memory. Memory-to-memory transfer capability is also provided, along with a memory block initialization fea- ture. DMA requests may be generated by either hardware or software, and each channel is independently programmable with a variety of features for flexible operation. The 82C237 is designed to be used with an external address latch, such as the 82C82, to demultiplex the most significant 8 bits of address. An additional latch is required to temporarily store the most significant 8 bits of data if 16-bit memory-to-memory transfers are desired. The 82C237 can be used with industry standard microprocessors such as 80C286, 80286, 80C86, 80C88, 8086, 8088, 8085, Z80, NSC800, 80186 and others. Multimode programmability allows the user to select from three basic types of DMA services, and reconfiguration under program control is possible even with the clock to the controller stopped. Each channel has a full 64K address and word count range, and may be programmed to autoinitialize these registers following DMA termination (end of process). Ordering Information PACKAGE TEMPERATURE RANGE 8MHz 12.5MHz PKG. NO. PDIP 0oC to +70oC CP82C237 CP82C237-12 E40.6 -40oC to +85oC IP82C237 IP82C237-12 E40.6 PLCC 0oC to +70oC CS82C237 CS82C237-12 N44.65 -40oC to +85oC IS82C237 IS82C237-12 N44.65 SBDIP 0oC to +70oC CD82C237 CD82C237-12 F40.6 -40oC to +85oC ID82C237 ID82C237-12 F40.6 -55oC to +125oC MD82C237/B MD82C237-12/B F40.6 SMD# 5962-9054304MQA 5962-9054305MQA F40.6 CLCC -55oC to +125oC MR82C237/B MR82C237-12/B J44.A SMD# 5962-9054304MXA 5962-9054305MXA J44.A File Number 2965.1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999 |
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