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Texas Instruments DS8923AM
- Part No.:
- DS8923AM
- Manufacturer:
- Texas Instruments
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DS8923AM.pdf
- Description:
- IC TRANSCEIVER FULL 2/2 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,681
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Product details
Overview
DS8923AM from Texas Instruments is a TRI-STATE RS-422 dual differential line driver and receiver pair in a 16-pin SOIC package, delivering 12 ns typical propagation delay, ±0.5 ns typical output skew, ±7 V common-mode input range, 200 mV receiver sensitivity, and fail-safe receiver inputs. It is designed for ST506/ST412/ESDI disk drive interfaces and EIA RS-422-compliant data transmission systems.
For engineers reviewing the DS8923AM datasheet, DS8923AM pinout, DS8923AM application, or DS8923AM equivalent, this device supports high-speed, noise-immune bidirectional communication in legacy storage and industrial serial links where precise timing, differential integrity, and controlled bus contention are critical.
Technical Context
The DS8923AM integrates two independent RS-422 drivers and two receivers on a single die, with separate enable controls for drivers (DEN) and receivers (REN), enabling asymmetric bus control. Its receiver incorporates 70 mV typical hysteresis and open-input fail-safe logic that forces HIGH output when inputs float.
Driver outputs are complementary and unipolar-differential, optimized for twisted-pair or parallel-wire transmission lines. Glitch-free power-up/down circuitry ensures TRI-STATE behavior during supply ramping, preventing false transitions on transmission lines during system initialization or shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Propagation Delay (Typ) | 12 ns - enables ≤83 MHz data rates in point-to-point RS-422 links with tight timing budgets. |
| Output Skew (Typ) | ±0.5 ns - ensures matched edge alignment between complementary driver outputs for clean differential signaling. |
| Common-Mode Input Range | ±7 V - allows reliable operation across noisy industrial backplanes or long cable runs with ground potential differences. |
| Receiver Sensitivity | ±200 mV - detects valid logic states even under degraded signal amplitude due to line loss or termination mismatch. |
| Hysteresis (Typ) | 70 mV - suppresses chatter on slowly rising/falling edges caused by EMI or unterminated stubs. |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with standard 5 V TTL/CMOS logic rails and regulated industrial supplies. |
| Operating Temperature | 0 °C to +70 °C - qualified for commercial-grade embedded systems and peripheral controller applications. |
Pinout & Package
DS8923AM is housed in a 16-pin SOIC package (Package Drawing D, R-PDSO-G16), with 1.27 mm pitch, gull-wing leads, and RoHS-compliant CU-SN finish. Moisture Sensitivity Level is Level-1 (unlimited floor life at <30 °C / 85% RH).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DEN | Driver Enable Input | Active-low control: drives DO1/DO2 into TRI-STATE when HIGH; enables differential output when LOW. |
| REN | Receiver Enable Input | Active-low control: disables RO1/RO2 (HI-Z) when HIGH; enables receiver function when LOW. |
| RO1, RO2 | Receiver Outputs | Complementary TTL/CMOS-compatible outputs reflecting differential input state at A/B pins. |
| DO1, DO2 | Driver Outputs | Complementary unipolar-differential outputs driven by logic inputs at D1/D2 pins. |
| A1, B1, A2, B2 | Receiver Inputs | Differential input pairs (A1/B1 for RO1; A2/B2 for RO2); tolerate ±10 V absolute max and ±7 V common-mode range. |
| D1, D2 | Driver Inputs | Single-ended TTL/CMOS logic inputs controlling respective driver output pairs (D1→DO1/DO2; D2→DO1/DO2). |
| VCC, GND | Power Supply | Single 4.5–5.5 V supply with decoupling recommended near pins 8 (GND) and 16 (VCC). |
Key Features
| Feature | Design Value |
|---|---|
| Separate driver/receiver enables | Enables independent bus arbitration-e.g., transmit-only or receive-only modes without disabling both functions. |
| Fail-safe receiver inputs | Guarantees RO1/RO2 = HIGH when A/B inputs are open-circuited or unterminated, preventing undefined bus states. |
| Glitch-free power sequencing | Internally forces all outputs to TRI-STATE during VCC ramp-up/down, eliminating spurious pulses on connected lines. |
| ±7 V common-mode tolerance | Supports robust communication over >10 m cables or across chassis grounds with up to 14 V potential difference. |
| 70 mV input hysteresis | Rejects low-frequency noise and prevents metastability on slow-rising signals typical in legacy disk interface waveforms. |
Applications
| ESDI Disk Interface | ST506/ST412 Hard Drive Controller |
|---|---|
Use Scenario: Bidirectional data transfer between host controller and ESDI hard drive using differential signaling over ribbon cables. IC Role / Device Role / Timing Role: Dual-line transceiver providing isolated driver/receiver paths for command/data and status/control channels. Use Value: Meets ESDI electrical specifications with 12 ns propagation delay and ±200 mV sensitivity, ensuring reliable sector-level transfers at up to 20 MB/s. |
Use Scenario: Interfacing legacy ST506/ST412 HDD controllers to drive electronics in industrial CNC or medical imaging storage subsystems. IC Role / Device Role / Timing Role: RS-422 line driver/receiver translating TTL-level controller signals to noise-immune differential pairs for head positioning and data read/write. Use Value: ±7 V common-mode range accommodates ground offsets across multi-board chassis; fail-safe logic prevents spurious seek commands during cable disconnect. |
| Industrial Serial Backplane | RS-422 Point-to-Point Link |
Use Scenario: Reliable communication between PLC I/O modules and central processor across electrically noisy factory-floor backplanes. IC Role / Device Role / Timing Role: Dual-channel transceiver handling simultaneous control (driver) and feedback (receiver) traffic on shared differential buses. Use Value: Independent DEN/REN control allows dynamic half-duplex operation; 70 mV hysteresis rejects motor-drive EMI coupling onto signal lines. |
Use Scenario: High-integrity serial link between embedded motion controller and servo amplifier over 30 m shielded twisted pair. IC Role / Device Role / Timing Role: RS-422 line driver/receiver ensuring signal integrity with minimal skew and deterministic timing margins. Use Value: 0.5 ns typical output skew preserves differential waveform symmetry, maintaining >30 dB common-mode rejection at 5 MHz clock rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar RS-422 dual transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS8922AM | Shared enable (EN1/EN2) for driver/receiver pairs; no independent DEN/REN control. | Requires synchronized enable timing for both directions; less flexible for asymmetric bus protocols. | Select DS8922AM only if system design uses unified direction control and does not require independent TX/RX gating. |
| SN65LBC179 | Single-channel RS-422 transceiver; lower drive strength (60 mA short-circuit); no fail-safe receiver. | Requires two devices for dual-channel operation; lacks open-input default HIGH behavior. | Choose SN65LBC179 only for space-constrained single-link designs where fail-safe and skew performance are secondary. |
Compared with DS8922AM and SN65LBC179, the DS8923AM provides unique independent enable control for precise bus arbitration, guaranteed fail-safe logic for cable-disconnect resilience, and tighter 0.5 ns skew for high-fidelity differential signaling-making it optimal for ESDI, ST506, and deterministic industrial serial links.
Availability
DS8923AM is available at Aetrix Electronics and suitable for ESDI disk interfaces, ST506/ST412 hard drive controllers, and industrial RS-422 backplanes requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for DS8923AM 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, specializing in analog, embedded processing, and connectivity technologies for industrial, automotive, and communications markets.
The DS8923AM belongs to TI's legacy RS-422 interface product line, engineered specifically for high-reliability, noise-immune data transmission in disk drive standards (ESDI, ST506, ST412) and industrial serial infrastructure.
FAQ
What is the pin configuration and package type of DS8923AM?
The DS8923AM uses a 16-pin SOIC package (Package Drawing D, R-PDSO-G16) with 1.27 mm lead pitch. Pin 1 is located at the top-left corner with the notch or dot indicator. Key terminals include DEN and REN for independent driver/receiver control, A1/B1 and A2/B2 for differential receiver inputs, D1/D2 for single-ended driver inputs, and RO1/RO2 and DO1/DO2 for complementary outputs. Full pinout details are confirmed in the TI SNLS373B datasheet Figure 2.
Does DS8923AM support fail-safe operation when receiver inputs are open?
Yes, DS8923AM includes built-in receiver input fail-safe circuitry. When A1/B1 or A2/B2 inputs are left floating or unterminated, the corresponding RO1 or RO2 output defaults to a logical HIGH state. This behavior is explicitly specified in the TI SNLS373B datasheet Section 1 "Features" and ensures defined bus states during cable removal or connector faults-critical for ESDI and ST506 disk drive reliability.
What are the absolute maximum ratings for DS8923AM supply voltage and input voltage?
The DS8923AM has an absolute maximum supply voltage of 7 V, and differential input voltage rating of ±12 V. Receiver input voltage is rated from ±10 V, with common-mode range limited to ±7 V during normal operation. These limits are documented in the "Absolute Maximum Ratings" table of the SNLS373B datasheet and define safe operating boundaries-not recommended operating conditions.
How does DS8923AM differ from DS8922AM in terms of control logic?
DS8923AM features separate driver enable (DEN) and receiver enable (REN) inputs, allowing independent control of transmit and receive paths. In contrast, DS8922AM uses shared enable signals (EN1/EN2) per driver/receiver pair. This architectural difference gives DS8923AM greater flexibility in half-duplex protocols and bus arbitration schemes, as confirmed in the functional truth tables of the SNLS373B datasheet Sections 3.1 and 3.2.
Is DS8923AM compatible with TTL and CMOS logic families?
Yes, DS8923AM is fully compatible with both TTL and CMOS logic families. Its driver inputs (D1/D2) accept standard TTL/CMOS voltage thresholds (VIH = 2.0 V min, VIL = 0.8 V max), and its receiver outputs (RO1/RO2) drive TTL/CMOS loads with VOH ≥ 2.5 V and VOL ≤ 0.5 V under specified conditions. This interoperability is verified in the "Recommended Operating Conditions" and "Electrical Characteristics" sections of the SNLS373B datasheet.
DS8923AM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Transceiver
- Protocol:
- RS422, RS485
- Number of Drivers/Receivers:
- 2/2
- Duplex:
- Full
- Receiver Hysteresis:
- 70 mV
- Data Rate:
- -
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
DS8923AM FAQ
1.How can I place an order for DS8923AM through Aetrix?
Please submit a Request for Quotation (RFQ) for DS8923AM 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 DS8923AM reliable?
The price and inventory of DS8923AM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS8923AM is usually 5 days.
3.What payment methods are accepted for DS8923AM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS8923AM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS8923AM?
DS8923AM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS8923AM 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 DS8923AM?
For technical support, including DS8923AM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS8923AM requirements.
6.How does Aetrix verify that DS8923AM is sourced from the original manufacturer or authorized distributors?
All DS8923AM 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 DS8923AM meets industry standards.
7.What is the process for return or replacement of DS8923AM?
All DS8923AM units undergo pre-shipment inspection (PSI). If there is an issue with DS8923AM, 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 DS8923AM part is unused and in its original packaging.
Return procedure for DS8923AM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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