My Inquiry
My Account
Texas Instruments DS8922AM
- Part No.:
- DS8922AM
- Manufacturer:
- Texas Instruments
- Category:
- Drivers, Receivers, Transceivers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
DS8922AM.pdf
- Description:
- IC TRANSCEIVER FULL 2/2 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,774
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
DS8922AM from Texas Instruments is a TRI-STATE RS-422 dual differential line driver and receiver pair in SOIC-16 package, featuring 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 industrial serial communication systems requiring robust noise immunity and controlled signal integrity.
For engineers reviewing the DS8922AM datasheet, DS8922AM pinout, DS8922AM application, or DS8922AM equivalent, this device supports TTL/CMOS-compatible control logic, offers glitch-free power-up/down behavior, and delivers precise timing performance critical for high-reliability backplane and storage subsystem designs.
Technical Context
The DS8922AM integrates two independent RS-422 driver/receiver channels with shared enable controls (EN1/EN2), enabling simultaneous or selective channel activation. Its receiver incorporates 70 mV typical hysteresis and open-input fail-safe circuitry that forces logical HIGH output when inputs are floating.
Driver outputs are complementary and ANDed internally, delivering unipolar differential drive with 0.5 ns typical skew and 12 ns typical propagation delay under 30 pF load. The device operates from 4.5 V to 5.5 V over 0°C to +70°C and meets EIA RS-422 electrical requirements including ±12 V differential input tolerance and ±7 V common-mode range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures compatibility with standard 5 V TTL/CMOS logic rails and stable operation across industrial voltage tolerances. |
| Propagation Delay (Typ) | 12 ns - Enables reliable data transmission up to ~40 Mbps in point-to-point or multidrop RS-422 configurations. |
| Output Skew (Typ) | ±0.5 ns - Minimizes timing mismatch between complementary driver outputs, preserving differential signal integrity. |
| Receiver Sensitivity | ±200 mV - Guarantees valid logic detection even with degraded signal amplitudes due to cable loss or noise coupling. |
| Common-Mode Range | ±7 V - Supports robust operation in electrically noisy environments such as disk drive enclosures or industrial backplanes. |
| Fail-Safe Input | Active-high output on open inputs - Prevents undefined bus states during cable disconnect or termination faults. |
| TRI-STATE Control | Independent EN1/EN2 per driver/receiver pair - Allows flexible bus arbitration and hot-swap capability without signal contention. |
Pinout & Package
DS8922AM is housed in a 16-pin SOIC (Small Outline Integrated Circuit) package, Package Drawing D (R-PDSO-G16), RoHS-compliant with CU SN lead finish and moisture sensitivity level (MSL) Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (EN1) | Driver/Receiver Pair 1 Enable | Active-low control: drives DO1/RO1 into HI-Z when high; enables both when low. |
| 2 (EN2) | Driver/Receiver Pair 2 Enable | Active-low control: drives DO2/RO2 into HI-Z when high; enables both when low. |
| 3 (RO1) | Receiver Output 1 | TTL/CMOS-compatible digital output reflecting differential input state of A1/B1 pins. |
| 4 (RO2) | Receiver Output 2 | TTL/CMOS-compatible digital output reflecting differential input state of A2/B2 pins. |
| 5 (DO1) | Driver Output 1 (Y1) | Complementary driver output terminal; paired with pin 6 (Z1) for differential signaling. |
| 6 (DO2) | Driver Output 2 (Y2) | Complementary driver output terminal; paired with pin 7 (Z2) for differential signaling. |
| 7 (Z1) | Driver Complement Output 1 | Inverted counterpart to pin 5; forms differential pair with Y1 for noise-rejecting transmission. |
| 8 (Z2) | Driver Complement Output 2 | Inverted counterpart to pin 6; forms differential pair with Y2 for noise-rejecting transmission. |
| 9 (GND) | Ground Reference | Primary signal return path for all I/O and internal circuitry; must be low-impedance for noise control. |
| 10 (VCC) | Positive Supply | 5 V nominal supply input; decoupling capacitor required near pin for transient current stability. |
| 11 (A1) | Receiver Input 1 Non-Inverting | Differential input terminal for channel 1; referenced to B1 (pin 12) for RS-422 compliance. |
| 12 (B1) | Receiver Input 1 Inverting | Differential input terminal for channel 1; referenced to A1 (pin 11) for RS-422 compliance. |
| 13 (A2) | Receiver Input 2 Non-Inverting | Differential input terminal for channel 2; referenced to B2 (pin 14) for RS-422 compliance. |
| 14 (B2) | Receiver Input 2 Inverting | Differential input terminal for channel 2; referenced to A2 (pin 13) for RS-422 compliance. |
| 15 (Y1) | Driver Output 1 (non-inverting) | Primary driver output for channel 1; driven differentially with Z1 (pin 7). |
| 16 (Y2) | Driver Output 2 (non-inverting) | Primary driver output for channel 2; driven differentially with Z2 (pin 8). |
Key Features
| Feature | Design Value |
|---|---|
| Glitch-Free Power-Up/Down | Internally forces all outputs into TRI-STATE during VCC ramp-up/down, preventing false transitions on connected buses. |
| Receiver Input Hysteresis | 70 mV typical - suppresses chatter on slow-rising/falling signals and improves noise margin in marginal signal conditions. |
| Fail-Safe Receiver Logic | Outputs HIGH when A/B inputs are open-circuited - eliminates need for external pull-up/pull-down resistors in unterminated scenarios. |
| Complementary Driver Outputs | AND-gated Y/Z outputs per channel ensure matched edge timing and eliminate shoot-through risk in differential mode. |
| TTL/CMOS Compatibility | VIH = 2.0 V, VIL = 0.8 V - allows direct interfacing with legacy microcontrollers, FPGAs, and ASICs without level-shifting. |
Applications
| ESDI Disk Interface | ST506/ST412 Hard Drive Bus |
|---|---|
Use Scenario: Bidirectional data transfer between host controller and ESDI hard disk drives using differential signaling over twisted-pair cables. IC Role / Device Role / Timing Role: Dual-channel RS-422 transceiver providing driver/receiver isolation, fail-safe termination, and skew-controlled timing for synchronous command/data bursts. Use Value: Enables reliable 10–20 Mbps ESDI protocol operation with built-in hysteresis and ±7 V common-mode rejection against motor-induced noise. |
Use Scenario: Interfacing legacy ST506/ST412 hard disk controllers to drive mechanisms in industrial automation and embedded storage systems. IC Role / Device Role / Timing Role: Line driver/receiver pair converting single-ended TTL signals to RS-422 differential format for long-distance, noise-immune cabling. Use Value: Maintains signal integrity over 15 m+ cable runs while supporting hot-plug detection via fail-safe receiver behavior. |
| Industrial Backplane Communication | RS-422 Multidrop Data Link |
Use Scenario: High-reliability inter-board communication across ruggedized backplanes in programmable logic controllers (PLCs) and motion controllers. IC Role / Device Role / Timing Role: Dual RS-422 transceiver managing two independent differential links for control/status exchange between CPU and I/O modules. Use Value: Delivers deterministic 12 ns propagation delay and ±0.5 ns skew to synchronize distributed real-time tasks across multiple slots. |
Use Scenario: Point-to-multipoint serial data distribution in factory floor networks where multiple receivers share one driver pair. IC Role / Device Role / Timing Role: Driver/receiver pair configured with shared EN control to manage bus arbitration and prevent contention in half-duplex topologies. Use Value: Supports up to 10 unit loads with fail-safe idle-bus detection, eliminating external biasing components and reducing BOM count. |
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 |
|---|---|---|---|
| SN65LBC179D | Single-channel RS-422 transceiver; no integrated enable logic per pair; higher 35 ns max propagation delay. | Lacks dual independent enable controls; requires external gating for per-channel TRI-STATE management. | Select when only one channel is needed or when board space permits discrete enable logic implementation. |
| MAX3080CSA+ | 5 V, fail-safe RS-422 receiver with 12 ns typ. delay but no integrated driver; requires external driver stage. | Receiver-only function; cannot replace DS8922AM's dual driver/receiver integration in compact designs. | Choose when receiver performance is prioritized and driver stage is already implemented elsewhere in the system. |
Compared with SN65LBC179D and MAX3080CSA+, the DS8922AM uniquely combines dual-channel integration, independent EN1/EN2 control, sub-13 ns propagation, and fail-safe receiver logic in a single SOIC-16 package-reducing component count and PCB footprint for disk interface and backplane applications.
Availability
DS8922AM is available at Aetrix Electronics and suitable for ESDI disk interfaces, ST506/ST412 storage subsystems, and industrial backplane communication requiring stable component supply and long-term lifecycle support.
Supply support for DS8922AM 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 solutions for industrial, automotive, and communications markets.
The DS8922AM belongs to TI's legacy RS-422 interface product line, engineered specifically for high-noise, high-reliability storage and industrial serial communication where fail-safe operation and precise timing are mandatory.
FAQ
What is the operating temperature range for DS8922AM?
The DS8922AM is specified for operation from 0°C to +70°C ambient temperature. This commercial-grade range aligns with its intended use in disk drive controllers and industrial backplanes where enclosure-level thermal management is typically provided. The device's electrical characteristics-including propagation delay, skew, and receiver sensitivity-are guaranteed across this full range per the SNLS373B datasheet.
Does DS8922AM support true RS-422 compliance?
Yes, DS8922AM meets the EIA RS-422 standard requirements, including ±12 V differential input voltage tolerance, ±7 V common-mode input range, 200 mV minimum receiver sensitivity, and driver short-circuit protection. Its differential output swing, hysteresis, and fail-safe behavior are explicitly validated per RS-422 in the official TI datasheet SNLS373B.
How does the fail-safe feature work on DS8922AM receiver inputs?
When the DS8922AM receiver inputs (A1/B1 or A2/B2) are left unconnected or unterminated, internal circuitry forces the corresponding RO1 or RO2 output to a logical HIGH state. This prevents undefined logic levels during cable disconnection or termination faults-eliminating the need for external bias resistors in many ST506/ESDI implementations.
Can DS8922AM be used with 3.3 V logic systems?
No, DS8922AM is designed for 4.5 V to 5.5 V operation and is not 3.3 V tolerant. Its VIH threshold is 2.0 V minimum and VIL is 0.8 V maximum, but supply voltage must be 5 V nominal. Direct connection to 3.3 V controllers requires level-shifting circuitry or a compatible 5 V domain interface.
What is the meaning of "DS8922AMX/NOPB" in the ordering code?
"DS8922AMX/NOPB" denotes the tape-and-reel packaging variant of DS8922AM: "X" indicates 2500-unit reel quantity, and "/NOPB" confirms lead-free, RoHS-compliant construction with matte tin (CU SN) finish. The base part DS8922AM is identical electrically and mechanically; only packaging and quantity differ from the tube-packaged DS8922AM/NOPB (48 units).
DS8922AM 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
DS8922AM FAQ
1.How can I place an order for DS8922AM through Aetrix?
Please submit a Request for Quotation (RFQ) for DS8922AM 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 DS8922AM reliable?
The price and inventory of DS8922AM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS8922AM is usually 5 days.
3.What payment methods are accepted for DS8922AM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS8922AM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS8922AM?
DS8922AM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS8922AM 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 DS8922AM?
For technical support, including DS8922AM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS8922AM requirements.
6.How does Aetrix verify that DS8922AM is sourced from the original manufacturer or authorized distributors?
All DS8922AM 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 DS8922AM meets industry standards.
7.What is the process for return or replacement of DS8922AM?
All DS8922AM units undergo pre-shipment inspection (PSI). If there is an issue with DS8922AM, 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 DS8922AM part is unused and in its original packaging.
Return procedure for DS8922AM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
DS8922AM Tags
-
ATA6561-GAQW-N
Microchip Technology
-
ATA6561-GBQW-N
Microchip Technology
-
AM26LS32ACDR
Texas Instruments
-
SP485CN-L/TR
MaxLinear, Inc.
-
SP485EN-L/TR
MaxLinear, Inc.
-
SP485EEN-L/TR
MaxLinear, Inc.
-
SP485ECN-L/TR
MaxLinear, Inc.
-
THVD1400DR
Texas Instruments
-
AM26C31IDR
Texas Instruments
-
TLIN1021ADRQ1
Texas Instruments
-
MAX232IDR
Texas Instruments
-
AM26C32IDR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
