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Texas Instruments AM26LS31PC
- Part No.:
- AM26LS31PC
- Manufacturer:
- Texas Instruments
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
AM26LS31PC.pdf
- Description:
- IC TRANSCEIVER 4/0 16PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,792
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Product details
Overview
AM26LS31PC from Texas Instruments is a quad high-speed differential line driver IC designed for RS-422-compliant digital data transmission over balanced twisted-pair lines. It operates from a single 5V supply, delivers 10 ns typical input-to-output delay, 2.0 ns typical output skew, and features TRI-STATE outputs with complementary drive capability in a 16-pin PDIP package - used in industrial serial communication backplanes and point-to-point data links.
For engineers reviewing the AM26LS31PC datasheet, AM26LS31PC pinout, AM26LS31PC application, or AM26LS31PC equivalent, key selection criteria include RS-422 compliance, 20 mA output drive strength, zero-load behavior at VCC = 0V, and compatibility with LS-TTL input logic levels in legacy industrial control systems.
Technical Context
The AM26LS31PC implements four independent differential drivers with logically ANDed enable control, supporting simultaneous activation or disablement of all outputs. Its output stage provides unipolar differential voltage drive (±2.5 V typical) into 100 Ω loads while maintaining EIA RS-422 electrical compliance across 0°C to +70°C.
Input circuitry presents one LS-TTL unit load with VIH = 2.0 V and VIL = 0.8 V, and includes input clamp diodes (VCL = −1.5 V) for transient protection. The device draws 35–60 mA ICC under full operation and supports short-circuit current limiting (−30 to −150 mA) without latch-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.75–5.25 V - ensures stable RS-422 output swing under nominal 5V rail tolerance in industrial power supplies. |
| Output Drive Current | ±20 mA - delivers sufficient current to drive 100 Ω differential termination while meeting RS-422 VOH/VOL specs (2.5 V/0.5 V). |
| Propagation Delay | 10–15 ns typical - enables reliable 50 Mbps+ data rates in point-to-point serial links with tight timing budgets. |
| Output Skew | 2.0 ns typical - maintains inter-channel timing alignment critical for multi-signal bus integrity in synchronous protocols. |
| Input Compatibility | LS-TTL unit load - allows direct interfacing with legacy 74LS logic without level-shifting or fanout buffering. |
| TRI-STATE Enable | tLZ/tHZ = 15–35 ns - supports dynamic bus sharing and hot-swap-safe line release in multi-drop configurations. |
| Short-Circuit Protection | −30 to −150 mA - prevents permanent damage during accidental line shorts or miswiring in field-deployed equipment. |
Pinout & Package
AM26LS31PC uses a 16-pin plastic dual in-line package (PDIP), package drawing NFG0016E, with 0.3-inch body width and through-hole mounting. Pin 1 is located at top-left corner with notch orientation as per standard DIP convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 10, 13 | Non-Inverting Inputs (A1–A4) | Accept LS-TTL-compatible digital inputs; each presents one unit load to upstream logic. |
| 2, 5, 11, 14 | Inverting Inputs (B1–B4) | Provide complementary input reference for differential driver pairs; tied to GND or driven for polarity control. |
| 3, 6, 12, 15 | Non-Inverting Outputs (Y1–Y4) | Drive positive-side of RS-422 differential pair; VOH ≥ 2.5 V @ −20 mA ensures noise margin. |
| 7, 8, 16, 9 | Inverting Outputs (Z1–Z4) | Drive negative-side of RS-422 differential pair; VOL ≤ 0.5 V @ 20 mA completes differential swing. |
| 16 | VCC | +5 V supply pin - powers all four drivers; outputs remain high-impedance when VCC = 0 V. |
| 8 | GND | Signal and power ground reference - shared return path for all drivers and inputs. |
| 11 | Enable (EN) | Active-high global enable - disables all outputs simultaneously into high-impedance state when low. |
Key Features
| Feature | Design Value |
|---|---|
| RS-422 Compliance | Meets EIA-422 electrical specifications including differential output voltage, common-mode range, and loading behavior. |
| Zero-Voltage Output Isolation | Outputs present no load to transmission line when VCC = 0 V - enables safe hot-plug and power sequencing in modular systems. |
| Four Drivers in One Package | Reduces PCB footprint and interconnect complexity versus discrete driver solutions - ideal for space-constrained backplane interfaces. |
| Output Short-Circuit Protection | Internally limits fault current to prevent thermal runaway during wiring errors or connector shorts in field installations. |
| Complementary Differential Outputs | Provides true differential signaling per channel (Y/Z) - improves noise immunity and enables transformer-coupled isolation. |
Applications
| Industrial PLC Backplanes | Point-to-Point Serial Links |
|---|---|
|
Use Scenario: High-reliability data exchange between CPU and I/O modules in programmable logic controllers using isolated RS-422 physical layer. IC Role / Device Role / Timing Role: Quad differential driver providing synchronized, noise-immune signal transmission across 1–10 m backplane traces. Use Value: 2.0 ns output skew ensures deterministic timing across four parallel control/data channels, reducing synchronization overhead in real-time scan cycles. |
Use Scenario: Bidirectional serial communication between CNC controller and servo amplifier over shielded twisted-pair cable in factory automation. IC Role / Device Role / Timing Role: Unidirectional RS-422 line driver transmitting position commands with 10 ns propagation delay for sub-microsecond latency. Use Value: ±20 mA output drive sustains valid differential voltage over 1200 m cable runs per RS-422 spec, eliminating need for repeaters. |
| Legacy Instrumentation Interfaces | Test Equipment Data Buses |
|
Use Scenario: Interfacing GPIB or IEEE-488 controllers with older test instruments requiring TTL-to-RS-422 level translation. IC Role / Device Role / Timing Role: Level-shifting driver converting LS-TTL logic signals to RS-422 compliant differential outputs. Use Value: LS-TTL input compatibility eliminates external buffer stages, simplifying interface design while preserving signal integrity. |
Use Scenario: Driving multiple synchronized trigger lines from automated test equipment to DUTs in semiconductor ATE systems. IC Role / Device Role / Timing Role: Simultaneous assertion of four precisely aligned strobe signals via differential outputs. Use Value: Matched propagation delays and low skew (<6 ns max) ensure sub-cycle timing correlation across parallel trigger paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad differential line driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS26LS31CN/NOPB | Same die, identical electrical specs, but in RoHS-compliant PDIP package with CU SN finish and MSL Level-1 rating. | No functional difference; preferred for new designs requiring RoHS compliance and moisture-sensitive handling controls. | Select DS26LS31CN/NOPB when lead-free assembly and JEDEC moisture classification are required. |
| SN65LVDS31DR | Differential LVDS driver (3.3 V supply), 400 Mbps capability, lower power (18 mA ICC), but incompatible voltage levels and not RS-422 compliant. | Suitable only for modern high-speed point-to-point links where LVDS signaling and 3.3 V logic are already established. | Choose SN65LVDS31DR only if migrating to LVDS infrastructure; not a drop-in replacement for RS-422 systems. |
Compared with DS26LS31CN/NOPB, AM26LS31PC offers identical functionality but lacks RoHS certification and formal MSL rating - making it suitable for legacy repair or non-RoHS production. Versus SN65LVDS31DR, AM26LS31PC provides RS-422 compliance and 5 V operation but at lower speed and higher power, targeting robustness over bandwidth.
Availability
AM26LS31PC is available at Aetrix Electronics and suitable for industrial PLC backplanes, point-to-point serial links, and legacy instrumentation interfaces requiring stable component supply and long-term obsolescence management.
Supply support for AM26LS31PC includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The AM26LS31PC belongs to TI's legacy interface line driver family, engineered specifically for robust, noise-immune RS-422 data transmission in harsh industrial environments with wide temperature tolerance and fail-safe power sequencing.
FAQ
What is the operating temperature range for the AM26LS31PC?
The AM26LS31PC is rated for operation from 0°C to +70°C ambient temperature. This commercial-grade specification aligns with its PDIP packaging and target use in industrial control panels and laboratory equipment where environmental conditions are controlled. The AM26LS31PC does not support extended or military temperature ranges - those require the DS26LS31M variant.
Does the AM26LS31PC support true RS-422 differential signaling?
Yes, the AM26LS31PC fully complies with EIA Standard RS-422. Each of its four channels provides complementary Y/Z outputs capable of delivering ≥2.5 V differential voltage into 100 Ω loads, with common-mode range and skew performance validated per RS-422 requirements. The AM26LS31PC is explicitly certified for this standard in its official TI datasheet.
Can the AM26LS31PC outputs be left floating or unterminated?
No - the AM26LS31PC requires proper differential termination (typically 100 Ω across Y/Z) to maintain signal integrity and avoid reflections. While its outputs enter high-impedance state when disabled, active operation without termination causes overshoot, ringing, and potential timing violations. The AM26LS31PC datasheet recommends termination resistors at the receiver end for optimal performance.
Is the AM26LS31PC pin-compatible with other members of the DS26LS31 family?
Yes, the AM26LS31PC is explicitly stated as pin-compatible with the DS26LS31C and DS26LS31M variants. All share identical 16-pin PDIP pinout, terminal functions, and logic behavior - enabling direct substitution in existing designs where temperature or reliability requirements permit. The AM26LS31PC retains full functional equivalence across enable control, input thresholds, and output drive characteristics.
What happens to AM26LS31PC outputs when VCC = 0 V?
When VCC = 0 V, the AM26LS31PC outputs present high impedance and do not load the transmission line - a key safety feature for hot-swap or power-sequencing scenarios. This behavior is guaranteed by internal circuit design and documented in the TI datasheet under "Outputs Won't Load Line when VCC = 0V". The AM26LS31PC remains electrically inert without supply voltage, preventing unintended signal injection or bus contention.
AM26LS31PC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Driver
- Protocol:
- RS422, RS485
- Number of Drivers/Receivers:
- 4/0
- Duplex:
- -
- Receiver Hysteresis:
- -
- Data Rate:
- -
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
AM26LS31PC FAQ
1.How can I place an order for AM26LS31PC through Aetrix?
Please submit a Request for Quotation (RFQ) for AM26LS31PC on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AM26LS31PC reliable?
The price and inventory of AM26LS31PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AM26LS31PC is usually 5 days.
3.What payment methods are accepted for AM26LS31PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AM26LS31PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AM26LS31PC?
AM26LS31PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AM26LS31PC order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AM26LS31PC?
For technical support, including AM26LS31PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AM26LS31PC requirements.
6.How does Aetrix verify that AM26LS31PC is sourced from the original manufacturer or authorized distributors?
All AM26LS31PC products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AM26LS31PC meets industry standards.
7.What is the process for return or replacement of AM26LS31PC?
All AM26LS31PC units undergo pre-shipment inspection (PSI). If there is an issue with AM26LS31PC, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AM26LS31PC part is unused and in its original packaging.
Return procedure for AM26LS31PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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