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Diodes Incorporated PI74HSTL1212AEX
- Part No.:
- PI74HSTL1212AEX
- Manufacturer:
- Diodes Incorporated
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
PI74HSTL1212AEX.pdf
- Description:
- IC TRANSLATOR BIDIR 64TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,260
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Product details
Overview
PI74HSTL1212AEX from Pericom Semiconductor is a 24-bit, dual-slice, bi-directional level-shifting transceiver supporting 1.8V HSTL Class I to 3.3V LVTTL/LVCMOS translation with independent 12-bit direction control per slice, 1.8V VCCA and 3.3V VCCB supply rails, and industrial temperature range (–40°C to +85°C), used in FPGA-to-memory bus interfacing where voltage domain isolation is required.
For engineers reviewing the PI74HSTL1212AEX datasheet, PI74HSTL1212AEX pinout, PI74HSTL1212AEX application, or PI74HSTL1212AEX equivalent, key selection criteria include dual-rail operation (VCCA=1.8V/VCCB=3.3V), 12-bit slice-level direction control, HSTL Class I compliance, TSSOP-64 thermal performance (θJA = 55°C/W), and industrial-grade reliability.
Technical Context
The PI74HSTL1212AEX implements two electrically isolated 12-bit transceiver banks, each with separate A-port (1.8V HSTL) and B-port (3.3V LVCMOS/LVTTL) I/Os, referenced to dedicated VREF pins (1VREF/2VREF). Direction control is implemented via four discrete inputs (1DAB/1DBA/2DAB/2DBA), enabling asynchronous bidirectional data flow per bank without shared enable logic.
It supports true bi-directional level translation under simultaneous dual-supply operation: A-port inputs accept –0.5V to VCCA+0.1V (≤1.9V), B-port inputs accept –0.5V to VCCB+0.1V (≤3.4V), and output drive strength is ±25mA per pin with clamp current limits of ±25mA. Propagation delay is ≤0.3ns (tPD), and inter-output skew within a 12-bit bank is guaranteed at ≤30ps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA Supply | 1.8V ±100mV - powers A-port HSTL I/Os and defines input threshold referencing for 1.8V domain |
| VCCB Supply | 3.3V ±300mV - powers B-port LVCMOS/LVTTL I/Os and sets output drive levels for 3.3V domain |
| Propagation Delay (tPD) | ≤0.3ns - enables high-speed memory interface timing closure in DDR/HSTL systems |
| Output Drive Strength | ±25mA per pin - sufficient to drive 50Ω transmission lines and meet HSTL Class I termination requirements |
| Inter-Output Skew | ≤30ps per 12-bit bank - ensures deterministic timing alignment across parallel data lanes |
| Operating Temperature | –40°C to +85°C - qualified for industrial embedded control and telecom infrastructure environments |
| Input Clamp Current | –25mA - protects against transient overvoltage on either port without external diodes |
Pinout & Package
PI74HSTL1212AEX is housed in a Pb-free and RoHS-compliant 64-pin TSSOP (240-mil wide, package code "A"), with θJA = 55°C/W and JEDEC-standard thermal pad layout. Pin numbering follows standard TSSOP convention with Pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A12 | A-port I/O (Slice 1) | 12-bit HSTL-compatible bidirectional data lines referenced to VCCA and 1VREF |
| 1B1–1B12 | B-port I/O (Slice 1) | 12-bit LVCMOS/LVTTL bidirectional data lines referenced to VCCB |
| 1DAB / 1DBA | Slice 1 direction control | 1DAB = HIGH enables A→B transfer; 1DBA = HIGH enables B→A transfer (independent per slice) |
| 1VREF | A-port reference voltage | Provides 0.9V internal reference for HSTL input thresholds on Slice 1 A-port |
| 2A1–2A12 | A-port I/O (Slice 2) | Second independent 12-bit HSTL data path, isolated from Slice 1 |
| 2B1–2B12 | B-port I/O (Slice 2) | Second independent 12-bit LVCMOS/LVTTL data path |
| 2DAB / 2DBA | Slice 2 direction control | Independent direction control identical in function to 1DAB/1DBA |
| 2VREF | A-port reference voltage | Provides 0.9V internal reference for HSTL input thresholds on Slice 2 A-port |
| VCCA | A-port supply rail | 1.8V supply for all A-port circuitry including input receivers and output drivers |
| VCCB | B-port supply rail | 3.3V supply for all B-port circuitry including input receivers and output drivers |
| GND | Ground reference | Dedicated ground pins distributed across package for low-noise return paths per port |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 12-bit slices | Enables concurrent, non-interfering level translation for two separate data buses (e.g., two memory channels) |
| HSTL Class I compliance | Meets JEDEC JESD8-6 specification for 1.8V HSTL inputs and outputs, ensuring compatibility with DDR SDRAM interfaces |
| Separate VREF per slice | Allows independent biasing of HSTL receiver thresholds for optimal noise margin in mixed-signal PCB layouts |
| Asynchronous direction control | Eliminates need for global direction strobes-each 12-bit slice can operate in opposite directions simultaneously |
| Pb-free & Green packaging | TSSOP-64 meets RoHS Directive 2011/65/EU and JEDEC JS-001 ESD standards (HBM ≥2kV) |
Applications
| DDR Memory Interface | FPGA-to-ASIC Interconnect |
|---|---|
|
Use Scenario: Translating command/address/data between a 1.8V HSTL DDR2 controller and a 3.3V legacy peripheral bus. IC Role / Device Role / Timing Role: Bi-directional level shifter with sub-0.3ns propagation delay and <30ps intra-bank skew for timing-critical DQ/DQS lines. Use Value: Eliminates need for discrete resistor networks or active buffers while maintaining signal integrity across voltage domains. |
Use Scenario: Connecting a 1.8V FPGA I/O bank to a 3.3V ASIC configuration interface during boot-up and runtime reconfiguration. IC Role / Device Role / Timing Role: Voltage-domain translator with independent slice control allowing simultaneous read/write operations across different protocol lanes. Use Value: Reduces PCB layer count by consolidating two 12-bit translation paths into one 64-pin package instead of two discrete 24-bit solutions. |
| Industrial PLC Backplane | Test Equipment Signal Conditioning |
|
Use Scenario: Isolating 1.8V sensor interface logic from 3.3V fieldbus communication modules in programmable logic controllers. IC Role / Device Role / Timing Role: Robust level shifter rated for –40°C to +85°C with ±25mA drive capability to withstand EMI-prone industrial environments. Use Value: Provides fault-tolerant I/O bridging without requiring external level-shifting ICs or level-shifting FETs. |
Use Scenario: Adapting high-speed digital stimulus signals from a 3.3V pattern generator to a 1.8V DUT input requiring HSTL-compatible waveforms. IC Role / Device Role / Timing Role: Precision waveform translator preserving edge fidelity with guaranteed 30ps skew for multi-channel synchronization. Use Value: Enables accurate timing correlation across 24 parallel test channels without custom PCB trace-length matching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bi-directional level shifting applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVC16T245DGGR | 16-bit, single-slice, 1.2V–3.6V variable VCCIO, no VREF pins, lower drive (±12mA) | Lacks HSTL Class I support and dual-slice independence; suited for general-purpose LVCMOS translation only | Select when cost sensitivity outweighs HSTL compliance and skew requirements |
| TXS0108EPRJR | 8-bit, auto-direction sensing, 1.65V–3.6V, open-drain compatible, no dual-rail VCCA/VCCB separation | Cannot support true 1.8V HSTL input thresholds or independent slice control; unsuitable for DDR timing paths | Prefer for low-power, low-pin-count I²C/SPI bridges-not for high-speed parallel buses |
Compared with SN74AVC16T245DGGR and TXS0108EPRJR, PI74HSTL1212AEX uniquely delivers dual 12-bit slices with HSTL Class I compliance, dedicated VREF, and <30ps skew-making it the only option qualified for DDR2 memory interface translation at industrial temperature.
Availability
PI74HSTL1212AEX is available at Aetrix Electronics and suitable for DDR2 memory subsystems, FPGA-based industrial controllers, automated test equipment backplanes, and telecom baseband processing modules requiring stable component supply across extended lifecycle programs.
Supply support for PI74HSTL1212AEX 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
Pericom Semiconductor was a fabless provider specializing in high-speed interface, timing, and signal-integrity solutions before its acquisition by Diodes Incorporated in 2016; its portfolio emphasizes robustness in industrial and communications infrastructure.
PI74HSTL1212AEX belongs to Pericom's HSTL/LVCMOS translation product line, engineered specifically for reliable voltage-domain bridging in DDR memory subsystems and FPGA-ASIC interconnects operating across harsh thermal and electrical environments.
FAQ
What is the maximum allowable voltage difference between VCCA and VCCB?
VCCA and VCCB may operate independently within their respective absolute maximum ranges: VCCA from –0.5V to 3.6V and VCCB from –0.5V to 3.6V. However, functional operation requires VCCA = 1.5V–2.5V (recommended 1.8V ±100mV) and VCCB = 2.7V–3.6V (recommended 3.3V ±300mV). The device does not require VCCA and VCCB to be equal or synchronized.
Can unused I/O pins be left floating?
No. All unused inputs-including 1DAB, 1DBA, 2DAB, 2DBA, and any unconnected A/B-port pins-must be tied to their respective VCC or GND rail. Floating inputs may cause increased IDD, unpredictable direction control, or latch-up due to internal HSTL receiver topology and CMOS input structure.
Is PI74HSTL1212AEX pin-compatible with earlier Pericom HSTL translators like PI74FCT162245?
No. PI74HSTL1212AEX uses a 64-pin TSSOP footprint with dual 12-bit slices and dedicated VREF pins, whereas PI74FCT162245 is a 48-pin SSOP device with 16-bit single-slice architecture and no VREF support. Pin mapping, power pin placement, and control signal assignment are incompatible.
Does the device support hot-swap or live-insertion?
No. PI74HSTL1212AEX lacks Ioff protection and bus-hold circuitry. Applying VCCB before VCCA-or powering one supply while the other is at 0V-may exceed absolute maximum ratings for I/O clamp current (±25mA) and cause permanent damage. Power sequencing must follow VCCA-first, then VCCB.
PI74HSTL1212AEX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- 74HSTL
- Package/Case:
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Translator Type:
- Voltage Level
- Channel Type:
- Bidirectional
- Number of Circuits:
- 2
- Channels per Circuit:
- 12
- Voltage - VCCA:
- 1.7 V ~ 1.9 V
- Voltage - VCCB:
- 3 V ~ 3.6 V
- Input Signal:
- -
- Output Signal:
- -
- Output Type:
- Non-Inverted
- Data Rate:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Features:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-TFSOP (0.240", 6.10mm Width)
PI74HSTL1212AEX FAQ
1.How can I place an order for PI74HSTL1212AEX through Aetrix?
Please submit a Request for Quotation (RFQ) for PI74HSTL1212AEX 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 PI74HSTL1212AEX reliable?
The price and inventory of PI74HSTL1212AEX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI74HSTL1212AEX is usually 5 days.
3.What payment methods are accepted for PI74HSTL1212AEX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI74HSTL1212AEX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI74HSTL1212AEX?
PI74HSTL1212AEX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI74HSTL1212AEX 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 PI74HSTL1212AEX?
For technical support, including PI74HSTL1212AEX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI74HSTL1212AEX requirements.
6.How does Aetrix verify that PI74HSTL1212AEX is sourced from the original manufacturer or authorized distributors?
All PI74HSTL1212AEX 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 PI74HSTL1212AEX meets industry standards.
7.What is the process for return or replacement of PI74HSTL1212AEX?
All PI74HSTL1212AEX units undergo pre-shipment inspection (PSI). If there is an issue with PI74HSTL1212AEX, 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 PI74HSTL1212AEX part is unused and in its original packaging.
Return procedure for PI74HSTL1212AEX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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