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Diodes Incorporated PI74HSTL1212AE
- Part No.:
- PI74HSTL1212AE
- Manufacturer:
- Diodes Incorporated
- Category:
- Translators, Level Shifters
- Package:
- Datasheet:
-
PI74HSTL1212AE.pdf
- Description:
- IC TRANSLATOR BIDIR 64TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,660
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Product details
Overview
PI74HSTL1212AE from Pericom Semiconductor is a 24-bit, dual-slice, bi-directional level-shifting transceiver enabling asynchronous translation between 1.8V HSTL Class I and 3.3V LVTTL/LVCMOS buses. It features independent 12-bit slice direction control (1DAB/1DBA, 2DAB/2DBA), dual supply rails (VCCA = 1.8V, VCCB = 3.3V), and operates across –40°C to +85°C for industrial bus interfacing.
For engineers reviewing the PI74HSTL1212AE datasheet, PI74HSTL1212AE pinout, PI74HSTL1212AE application, or PI74HSTL1212AE equivalent, key selection considerations include verified 1.8V↔3.3V bidirectional level shift capability, per-slice direction control logic, input/output voltage tolerance relative to respective VCC rails, and TSSOP-64 thermal performance under sustained 25mA output drive.
Technical Context
The PI74HSTL1212AE implements two electrically isolated 12-bit transceiver banks, each with dedicated direction-control inputs (1DAB/1DBA and 2DAB/2DBA) and separate reference voltage inputs (1VREF, 2VREF). Signal translation occurs without internal latching or clocking-purely combinatorial level shifting.
Each A-port I/O supports 1.8V HSTL Class I thresholds (VIH = VCCA + 0.1V, VIL = VCCA – 0.1V), while B-port I/O meets 3.3V LVTTL levels (VIH = 2.0V min, VIL = 0.8V max). Propagation delay is ≤300ps per direction (tPD), with output skew <30ps within each 12-bit bank.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCCA Supply | 1.8V ±100mV - powers A-port HSTL interface; sets VIH/VIL thresholds relative to VCCA |
| VCCB Supply | 3.3V ±300mV - powers B-port LVTTL/LVCMOS interface; defines VOH/VOL swing |
| Input Voltage Range (A-port) | –0.5V to VCCA+0.1V - ensures safe operation with HSTL signal overshoot/undershoot |
| Output Drive Current | ±25mA per pin - supports direct connection to 50Ω transmission lines or stub-loaded buses |
| Propagation Delay (tPD) | ≤300ps - enables sub-nanosecond timing alignment in high-speed memory or FPGA interconnects |
| Operating Temperature | –40°C to +85°C - validated for industrial-grade embedded systems without derating |
| Package Thermal Impedance | 55°C/W (θJA) - supports continuous 24-bit operation at full drive without external heatsinking |
Pinout & Package
PI74HSTL1212AE is housed in a Pb-free, green-compliant 64-pin TSSOP (240-mil wide, package code "A"), with exposed thermal pad not connected internally. Pin assignment follows JEDEC MO-153 standard layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1A1–1A12, 2A1–2A12 | A-port I/O (HSTL) | 12-bit bi-directional data lanes tied to 1.8V domain; referenced to 1VREF/2VREF |
| 1B1–1B12, 2B1–2B12 | B-port I/O (LVTTL) | 12-bit bi-directional data lanes tied to 3.3V domain; compatible with standard CMOS inputs |
| 1DAB/1DBA, 2DAB/2DBA | Direction Control Inputs | Active-high signals selecting A→B or B→A flow per 12-bit slice; no internal pull-up/down |
| 1VREF, 2VREF | Reference Voltage Inputs | Accept 0.9V nominal for HSTL threshold setting; must be decoupled with 0.1µF ceramic |
| VCCA, VCCB, GND | Power & Ground Terminals | Dual-supply architecture requires separate 1.8V and 3.3V supplies; 12 GND pins minimize ground bounce |
Key Features
| Feature | Design Value |
|---|---|
| Dual Independent 12-Bit Slice Control | Enables mixed-direction data flow (e.g., address out on slice 1, data in on slice 2) without external logic |
| HSTL Class I Compliance | Meets JEDEC JESD8-12A input thresholds and drive strength for DDR SDRAM command/address buses |
| Asynchronous Level Translation | No clock or timing constraints-supports burst, random, or handshaked transfers between domains |
| Robust ESD Protection | ±25mA clamp current rating on all I/O pins protects against system-level transient events |
| Pb-Free & Green Packaging | TSSOP-64 meets RoHS Directive 2011/65/EU and JEDEC JS-001 Class 3B (8kV HBM) |
Applications
| DDR Memory Interface | FPGA-to-ASIC Bus Bridging |
|---|---|
|
Use Scenario: Interfacing a 1.8V HSTL-based DDR2 memory controller to a 3.3V legacy peripheral bus. IC Role / Device Role / Timing Role: Bidirectional level shifter for command/address/data lines with per-slice direction control for read/write separation. Use Value: Eliminates need for discrete resistor networks or active buffers while maintaining sub-300ps propagation delay for timing-critical strobes. |
Use Scenario: Connecting a Xilinx Spartan-6 FPGA (1.8V HSTL I/O) to a 3.3V microcontroller-based subsystem. IC Role / Device Role / Timing Role: Voltage-domain translator enabling synchronous parallel data exchange without clock domain crossing logic. Use Value: Reduces FPGA I/O resource usage by offloading level translation, preserving logic cells for application-specific functions. |
| Industrial PLC Backplane | Test Equipment Signal Conditioning |
|
Use Scenario: Isolating 1.8V sensor interface ASICs from 3.3V main processor bus in programmable logic controllers. IC Role / Device Role / Timing Role: Robust, temperature-stable bus translator operating continuously at –40°C to +85°C ambient. Use Value: Maintains signal integrity over long backplane traces with 55°C/W θJA and 12 dedicated GND pins for low-noise return paths. |
Use Scenario: Adapting test pattern generator outputs (3.3V LVCMOS) to device-under-test HSTL inputs (1.8V). IC Role / Device Role / Timing Role: Precision level shifter with guaranteed 30ps intra-bank skew for multi-channel timing alignment. Use Value: Enables simultaneous stimulus of multiple DUT pins with deterministic phase relationship, critical for jitter-sensitive measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bi-directional level translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVC16T245 | 16-bit, single-slice, 1.2V–3.6V variable VCCA/VCCB; no VREF inputs; lower drive (±12mA) | Lacks HSTL Class I compliance; unsuitable for DDR command/address timing-critical paths | Prefer for general-purpose low-power logic translation where HSTL thresholds are not required |
| TXS0108E | 8-bit, auto-direction sensing, 1.65V–3.6V; open-drain B-port; no independent slice control | Cannot support simultaneous A→B and B→A traffic on same port; incompatible with HSTL termination schemes | Select only when direction is unidirectional per transaction and bus loading is light (<10pF) |
Compared with SN74AVC16T245 and TXS0108E, PI74HSTL1212AE uniquely delivers HSTL Class I–compliant thresholds, per-slice direction control, and 25mA drive-making it the only viable option for DDR2/3 memory subsystem bridging where timing, noise margin, and mixed-direction concurrency are mandatory.
Availability
PI74HSTL1212AE is available at Aetrix Electronics and suitable for DDR memory interfaces, FPGA-to-ASIC bridging, and industrial PLC backplanes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for PI74HSTL1212AE 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 of high-speed interface and timing solutions, acquired by Diodes Incorporated in 2016; its legacy portfolio remains actively supported and qualified for industrial applications.
PI74HSTL1212AE belongs to Pericom's HSTL translation transceiver product line, engineered specifically for reliable, low-skew voltage-domain bridging in DDR memory subsystems and high-speed digital backplanes.
FAQ
Can PI74HSTL1212AE operate with VCCA = 1.5V or 2.5V?
Yes-datasheet specifies VCCA operating range as 1.5V to 2.5V, with recommended 1.8V ±100mV. At 1.5V, VIH/VIL thresholds scale accordingly (e.g., VIH ≈ 1.6V), and output drive reduces slightly but remains functional for short-trace HSTL loads. Full 25mA drive is guaranteed only at 1.8V.
Is external termination required on A-port HSTL lines?
Yes-HSTL Class I requires 25Ω source termination to VTT (VCCA/2) on each A-port line. The PI74HSTL1212AE does not integrate termination resistors; external 25Ω series resistors must be placed adjacent to the driver output per JEDEC specification.
What happens if 1VREF and 2VREF are shorted together?
Shorting 1VREF and 2VREF is electrically permissible and commonly done to simplify layout, provided both slices use identical HSTL thresholds. The device draws negligible current (<10µA) from each VREF pin, so shared 0.1µF decoupling remains effective.
Does PI74HSTL1212AE support hot-swap or power sequencing?
No-absolute maximum ratings require VCCA and VCCB to be powered within ±0.5V of each other during startup. Simultaneous ramp-up is recommended; powering VCCB before VCCA risks forward-biasing internal ESD diodes. Use power supervisors to enforce sequencing.
PI74HSTL1212AE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- 74HSTL
- Package/Case:
- Packaging:
- Tube
- 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)
PI74HSTL1212AE FAQ
1.How can I place an order for PI74HSTL1212AE through Aetrix?
Please submit a Request for Quotation (RFQ) for PI74HSTL1212AE 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 PI74HSTL1212AE reliable?
The price and inventory of PI74HSTL1212AE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PI74HSTL1212AE is usually 5 days.
3.What payment methods are accepted for PI74HSTL1212AE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PI74HSTL1212AE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PI74HSTL1212AE?
PI74HSTL1212AE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PI74HSTL1212AE 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 PI74HSTL1212AE?
For technical support, including PI74HSTL1212AE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PI74HSTL1212AE requirements.
6.How does Aetrix verify that PI74HSTL1212AE is sourced from the original manufacturer or authorized distributors?
All PI74HSTL1212AE 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 PI74HSTL1212AE meets industry standards.
7.What is the process for return or replacement of PI74HSTL1212AE?
All PI74HSTL1212AE units undergo pre-shipment inspection (PSI). If there is an issue with PI74HSTL1212AE, 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 PI74HSTL1212AE part is unused and in its original packaging.
Return procedure for PI74HSTL1212AE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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