CS82C37A - 5V 8MHz CMOS DMA Controller | Renesas
N.º da peça: CS82C37A ✓ AtivoCS82C37A Visão geral
A direct memory access controller is an interface IC that transfers blocks of data between memory and peripherals without requiring continuous processor intervention. The DMA controller therefore fits within the broader hierarchy of interface controllers, bus-interface devices, semiconductors, and programmable system support logic. It is particularly useful in legacy embedded systems where a processor must service multiple high-throughput data paths while retaining deterministic memory access.
The CS82C37A operates from a 5 V supply and supports an 8 MHz clock. Its principal functions include programmable transfer modes, address generation, byte and word transfers, terminal counts, request generation, and status reporting. These capabilities allow it to move data among system memory and peripheral devices with less CPU overhead than software-driven block transfers.
The 44-PLCC package provides a through-hole-compatible surface-mount footprint with 0.64 mm pitch and a 16.58 mm by 16.58 mm body. The package is relatively large compared with modern fine-pitch controllers, but it remains practical for legacy computer, industrial-control, test-equipment, and embedded-system boards that were designed around the 8237A interface.
Typical applications include IBM PC-compatible DMA subsystems, data-acquisition equipment, communication adapters, memory-to-memory transfers, and industrial peripherals requiring autonomous block movement. The CS82C37A is most appropriate when preserving an established 8237A bus architecture is more important than adopting a newer DMA controller with a different electrical or programming interface.
Before replacing an original 8237A, verify the system clock, control-signal timing, address multiplexing, interrupt behavior, and package pin arrangement against the manufacturer datasheet. The enhanced CS82C37A is designed to reduce power consumption relative to the original NMOS implementation, but the surrounding processor, peripheral devices, memory timing, and bus timing still determine the achievable system throughput.
Alternativas drop-in para CS82C37A — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
CS82C37A-12
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
CS82C37A-5
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
CS82C37A96
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
CS82C37A-1296
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
IS82C37A
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
CS82C37A Especificações
| Product Type | CMOS programmable DMA controller |
| Base Function | 8237A-compatible direct memory access controller |
| Tensão de alimentação | 5 V |
| Operating Frequency | 8 MHz |
| Process Technology | 2-micron CMOS |
| Architecture | Fully static |
| Gated Operation | Supported |
| NMOS Pin Compatibility | Pin compatible |
| Encapsulamento | 44-PLCC, 16.58 mm x 16.58 mm |
| Package Pin Count | 44 pins |
| Tipo de montagem | Surface mount |
| Transfer Function | Direct memory access |
Guia de Configuração de Pinos do CS82C37A 44 pins
Configuração de pinos para CS82C37A (pacote 44 pins). A numeração dos pinos, funções e diagramas de conexão estão definidos no datasheet do fabricante. Consulte-o para o footprint exato e diretrizes de soldagem.
Nenhum dado detalhado de pinagem disponível para CS82C37A.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
CS82C37A é adequado para 6 aplicaçãos: Legacy PC-Compatible DMA Systems, Memory-to-Peripheral Data Transfer, Industrial Data-Acquisition Control, Communication Adapter Data Transfer, Test and Measurement Buffering, Memory-to-Memory Copy Engine.
Legacy PC-Compatible DMA Systems
The CS82C37A fits an 8237A-style personal-computer DMA subsystem because it retains NMOS-design pin compatibility while using a 2-micron CMOS process. Its 5 V supply and 8 MHz operating rating support established bus architectures, while reduced power consumption is beneficial in continuously powered legacy equipment. Install it only after confirming the board's 44-pin PLCC footprint, clock source, address multiplexing, request priority, and acknowledge timing against the Renesas 82C37A datasheet.
Recomendado
Memory-to-Peripheral Data Transfer
The CS82C37A is suited to moving blocks between system memory and a peripheral when the host processor should remain available for other work. Programmable address generation and terminal-count control allow the controller to manage repetitive transfers while the peripheral asserts a DMA request. In a new design, preserve the documented request, acknowledge, ready, and terminal-count timing and confirm that the 5 V, 8 MHz device is appropriate for the intended bus speed.
Recomendado
Industrial Data-Acquisition Control
The CS82C37A can support repetitive acquisition and buffering in legacy industrial equipment by transferring peripheral data into memory under hardware request control. The fixed 44-pin PLCC package is straightforward to retain on an established control board, and the CMOS implementation reduces power relative to the original NMOS 8237A. The design should include request timeout handling, bus contention control, and status monitoring so a peripheral fault cannot indefinitely hold the DMA channel.
Recomendado
Communication Adapter Data Transfer
The CS82C37A is appropriate for a communication adapter built around an 8237A-compatible bus, particularly when buffered block transfers must occur without tying up the host processor. Its programmable DMA operation supports predictable movement between receive or transmit buffers and memory. Because the part is a legacy interface controller, the adapter designer should preserve the original handshake timing, provide proper isolation, and verify that no newer interface controller offers a lower-risk migration path.
Recomendado
Test and Measurement Buffering
The CS82C37A can buffer instrument data between an acquisition peripheral and memory in legacy test systems based on the 8237A architecture. The controller reduces processor involvement during long transfers and provides hardware-addressed block movement. Designers should confirm that acquisition clocks, DMA requests, and terminal-count events cannot create an overflow condition, and should use the original system schematics to verify address sequencing and bus arbitration during simultaneous channel activity.
Recomendado
Memory-to-Memory Copy Engine
The CS82C37A can support memory-to-memory copying in a legacy system when programmed for that transfer mode and when the surrounding bus architecture permits simultaneous source and destination access. Moving large blocks this way can reduce byte-by-byte processor work, but correct address generation and bus contention control remain essential. Validate the programmed transfer mode, terminal-count behavior, and completion status in hardware before relying on it for continuous operations.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para CS82C37A — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | CS82C37A-12 | CS82C37A-5 | CS82C37A96 | CS82C37A-1296 | IS82C37A |
|---|---|---|---|---|---|---|
| Package | 44-PLCC (16.58x16.58) | 44-PLCC (16.58x16.58) | 44-PLCC (16.58x16.58) | 44-PLCC (16.58x16.58) | 44-PLCC (16.58x16.58) | 44-PLCC (16.58x16.58) |
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Renesas Electronics | Intersil |
| Product Type | CMOS programmable DMA controller | CMOS programmable DMA controller | CMOS programmable DMA controller | CS82C37A-family DMA controller | CS82C37A-family DMA controller | 82C37A-family DMA controller |
| Base Compatibility | 8237A-compatible NMOS pin interface | 8237A-family controller | 8237A-family controller | CS82C37A-family controller | Pin-to-pin CS82C37A cross-reference | 82C37A-family controller |
Principais diferenciais
- Maintains the established 8237A legacy interface while using CMOS (vs Original NMOS 8237A)
- Eight-megahertz device rating (vs CS82C37A-5)
- Higher-frequency option for compatible legacy boards (vs CS82C37A-5)
Notas de projeto
Treat the CS82C37A as a legacy bus device and preserve the original 8237A-compatible placement whenever possible. Route the address, request, acknowledge, ready, and terminal-count signals using the topology and impedance strategy of the host board. Avoid long unprotected traces between the controller and memory or peripheral devices, because propagation delay can affect bus arbitration even when the controller itself operates at 8 MHz.
Design the 5 V supply path for both the controller and its attached bus devices, including decoupling close to the PLCC power pins. Follow the manufacturer datasheet for capacitor values, voltage tolerances, and current limits rather than extrapolating them from generic 8237A boards. The CMOS implementation reduces power consumption relative to the NMOS original, but supply integrity remains essential when a DMA transfer changes the bus load abruptly.
Do not approve a replacement solely because the package outline and pin count match. Compare the exact ordering code, clock rating, address and terminal-count behavior, request priority, ready handling, electrical characteristics, and temperature limits. A speed-grade change can alter timing margins even when the controller function is the same, and an Intersil-branded candidate requires the same level of verification as a Renesas variant.
Informações de conformidade
Compliance declarations are not identified in the product-listing material. The device is a legacy CMOS interface IC and is not identified as an automotive-qualified AEC-Q100 component.
