CS82C86H - 8-Bit CMOS Bus Transceiver | Texas Instruments
MPN: CS82C86H ✓ ActiveCS82C86H Overview
A bus transceiver is an interface IC that connects two digital systems while allowing data to travel in either direction. Its functional hierarchy is octal transceiver, bidirectional transceiver, bus-interface logic IC, interface IC, and semiconductor. The CS82C86H combines eight data lines with direction and output-enable control, allowing a processor or bus controller to drive a shared bus or receive data from it without changing the board layout.
Key features include a complete eight-bit bidirectional data interface, an 8286-compatible pin arrangement, 20 mA output-low drive capability on the B side, 8 mA input-high current, and operation across a 4.5 V to 5.5 V supply range. The PLCC-20 surface-mount package supports compact legacy computer, industrial-control, and embedded bus-interface designs while retaining readily identifiable logic functions.
The device was originally documented by Intersil and Harris and is associated with the CS82C86 family. Its direction-control architecture requires the system to assert the transmit-enable state before the transceiver actively drives the bus and deassert it before changing direction. Because the output driver can source and sink bus current, external termination, pull-up, or pull-down components may influence signal integrity and must be selected from the circuit-level requirements rather than assumed universally.
Typical uses include bidirectional processor and peripheral data buses, memory-interface control, industrial acquisition equipment, and legacy computer backplanes. The 8286-compatible arrangement simplifies migration among bus-interface components that use the same directional and enable conventions. Systems should still validate timing, drive strength, and termination because a common pinout does not guarantee identical propagation delay or output characteristics among every device in the 8286-compatible ecosystem.
For robust implementation, connect the data pins only to compatible bus nodes, define DIR and OE states during reset so no device contests the bus, and use pull-up resistors where the bus requires a defined idle state. Confirm signal polarity and timing in the manufacturer's data sheet before replacing a part in an existing two-board system. Avoid using a package with a different lead arrangement unless the PCB footprint and pin assignment have been independently verified.
This product page combines the device family description, package information, interface features, procurement guidance, and practical bus-layout considerations. It also distinguishes verified functions from parameters that must be checked in the original manufacturer data sheet before timing closure, replacement qualification, or high-volume PCB release.
Drop-in alternatives for CS82C86H — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
No drop-in alternatives available for this product.
Request AlternativesCS82C86H Maximum Ratings & Electrical Characteristics
| Product Type | CMOS octal bidirectional bus transceiver |
| Data Width | 8 bits |
| Bidirectional Data Channels | 8 channels |
| Supply Voltage Range | 4.5 V to 5.5 V |
| B-Side Output Low Current | 20 mA |
| Input High Current | 8 mA |
| Package Type | PLCC-20 |
| Package Dimensions | 9 mm x 9 mm |
| Lead Count | 20 leads |
| Mounting Type | Surface mount |
| Process Technology | Self-aligned silicon-gate CMOS, Scaled SAJI IV |
| Compatibility | Industry-standard 8286-compatible pinout |
| Direction Control | DIR input |
| Output Enable Control | OE input |
| RoHS Status | Compliant |
CS82C86H Pin Configuration
| Pin 1 | DIR — Direction control input |
| Pin 2 | OE — Output-enable input |
| Pin 3 | A1 — A-side bidirectional data input or output |
| Pin 4 | A2 — A-side bidirectional data input or output |
| Pin 5 | A3 — A-side bidirectional data input or output |
| Pin 6 | A4 — A-side bidirectional data input or output |
| Pin 7 | A5 — A-side bidirectional data input or output |
| Pin 8 | A6 — A-side bidirectional data input or output |
| Pin 9 | A7 — A-side bidirectional data input or output |
| Pin 10 | A8 — A-side bidirectional data input or output |
| Pin 11 | B1 — B-side bidirectional data input or output |
| Pin 12 | B2 — B-side bidirectional data input or output |
| Pin 13 | B3 — B-side bidirectional data input or output |
| Pin 14 | B4 — B-side bidirectional data input or output |
| Pin 15 | B5 — B-side bidirectional data input or output |
| Pin 16 | B6 — B-side bidirectional data input or output |
| Pin 17 | B7 — B-side bidirectional data input or output |
| Pin 18 | B8 — B-side bidirectional data input or output |
| Pin 19 | GND — Ground connection |
| Pin 20 | VCC — Positive supply connection |
Typical Applications
CS82C86H is suitable for 6 applications: Legacy Processor Bus Interface, Peripheral Data-Bus Buffering, Industrial Acquisition Backplane, Memory Interface Control, Computer Backplane Communication, Communications Module Interconnect.
Legacy Processor Bus Interface
The CS82C86H fits a legacy 5 V processor bus that requires eight data lines to operate as a single bidirectional port. Its documented 4.5 V to 5.5 V supply range, 20 mA B-side output-low capability, and 8286-compatible control arrangement allow the device to sit between a controller and a shared bus. DIR selects transmit or receive operation, while OE disables the drivers during reset and bus arbitration. The original manufacturer timing characteristics must be used to establish setup, hold, and propagation margins rather than inferred from the bus width alone.
Peripheral Data-Bus Buffering
The CS82C86H is appropriate for isolating a peripheral data port from a wider shared bus while preserving bidirectional communication. Its eight parallel channels reduce the number of separate buffers needed for byte-wide data paths, and the PLCC-20 package provides a compact surface-mount footprint. Engineers should assign DIR and OE states so that the peripheral cannot contend with another bus master. Pull-up or pull-down components should be placed close to the transceiver when the bus requires a defined inactive level.
Industrial Acquisition Backplane
The CS82C86H can support bidirectional data transfer between an acquisition controller and a backplane in a 5 V industrial system. Its eight-bit architecture suits byte-wide control and measurement buses, while the 20 mA B-side sink-current specification provides useful drive capability for conventional CMOS loading. Board-level signal integrity still depends on bus length, topology, termination, and the number of connected loads. Use short branches and validate ringing and setup time in the complete system rather than relying only on component-level timing.
Memory Interface Control
The CS82C86H can be used as the directional bus element in older memory-control architectures where address, data, and control paths are divided among several devices. The eight bidirectional lines provide a byte-wide data interface, while DIR and OE allow the system to prevent simultaneous driving from more than one source. Care is required around memory read and write turnaround because the control sequence must guarantee adequate dead time before direction changes. Consult the manufacturer data sheet for the exact propagation-delay and timing values used in the original design.
Computer Backplane Communication
The CS82C86H matches the functional needs of legacy computer backplanes that distribute byte-wide bidirectional signals among several modules. Its 8286-compatible arrangement supports predictable integration with compatible bus-interface logic, and the PLCC-20 package provides 20 leads in a 9 mm by 9 mm body. Backplane implementations must account for signal reflections, bus topology, load capacitance, and clock-skew tolerance. Direction and output-enable control should remain deterministic during power-up, reset, and fault-recovery states.
Communications Module Interconnect
The CS82C86H can serve as a parallel interface element in older communications equipment that exchanges byte-wide control or payload data with a host processor. Its bidirectional channel count reduces the number of discrete bus-driver packages, and the 4.5 V to 5.5 V operating range matches 5 V CMOS logic systems. The design should disable outputs during reset, keep control traces away from sensitive analog paths, and use termination appropriate to the physical bus. Signal-integrity and timing verification must include the complete interconnect rather than the transceiver alone.
Engineering reference data for CS82C86H — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Product Type | CMOS octal bidirectional bus transceiver |
| Brand | Texas Instruments |
| Package | PLCC-20 (9 mm x 9 mm) |
| Data Width | 8 bits |
| Bidirectional Channels | 8 channels |
| Supply Voltage Range | 4.5 V to 5.5 V |
| B-Side Output Low Current | 20 mA |
| Input High Current | 8 mA |
| Pin Compatibility | Industry-standard 8286-compatible pinout |
| Process Technology | Scaled SAJI IV self-aligned silicon-gate CMOS |
Key Differentiators
- Full byte-wide bidirectional interface (vs 82C86H)
- Documented 8286-compatible arrangement (vs CS82C86H-5)
- Defined 5 V CMOS operating range (vs Generic octal transceiver)
Design Notes
Do not assume that an 8286-compatible pinout guarantees identical replacement behavior. Verify the exact package, lead numbering, DIR and OE polarity, propagation delay, setup and hold timing, and output-current limits before substituting another 82C86-family device. The CS82C86H is a PLCC-20 device, so a lead-compatible function in another package cannot be installed without changing the PCB footprint.
Place the transceiver near the connector or bus segment it serves, and keep DIR and OE traces short so reset or control glitches do not enable the drivers unexpectedly. Use pull-up or pull-down resistors only when the bus specification requires a defined idle level. Avoid long stubs from the main bus because they can create reflections that reduce the available timing margin.
Define DIR and OE states in hardware so the CS82C86H remains high impedance during reset, arbitration, and fault recovery. Check the complete network for multiple drivers, capacitive loading, and turnaround dead time before direction changes. The documented 20 mA B-side output-low current is a test-condition value, not a substitute for a board-level signal-integrity calculation.
Compliance Information
RoHS compliance is identified in the distributor component record. No automotive qualification is stated for this general-purpose logic IC.
