Diodes Incorporated PI74SSTV16857AE

Overview

PI74SSTV16857AE from Pericom Semiconductor is a 14-bit registered SSTL_2 bus driver IC designed for DDR memory interface buffering, operating at 2.3V–2.7V VDD/VDDQ with differential clock inputs (CLK/CLK), asynchronous LVCMOS RESET, and flow-through architecture. It delivers 200 MHz maximum clock frequency, 7.0 ns propagation delay (tPLH/tPHL), and supports SSTL_2 Class I/II I/O levels with VREF-referenced inputs.

For engineers reviewing the PI74SSTV16857AE datasheet, PI74SSTV16857AE pinout, PI74SSTV16857AE application, or PI74SSTV16857AE equivalent, key selection criteria include SSTL_2 compliance, 14-bit registered output timing control, 48-pin TSSOP lead-free packaging, and reset behavior during DDR power-up sequencing.

Technical Context

This device implements a synchronous, edge-triggered register bank with dual-clock differential input (CLK/CLK) and asynchronous active-low RESET. All 14 data outputs (Q1–Q14) are registered on the rising edge of CLK, while RESET forces Q outputs low and disables all input receivers independently of VREF stability.

It uses advanced 0.35 µm CMOS technology to achieve SSTL_2-compatible I/O with VIH = VREF + 350 mV (AC), VIL = VREF − 350 mV (AC), and LVCMOS-level RESET (VIH = VDD, VIL = GND). The flow-through architecture ensures minimal signal path skew between D and Q paths.

Key Specifications

Pinout & Package

PI74SSTV16857AE is housed in a 48-pin, 240-mil wide lead-free plastic TSSOP (Thin Shrink Small Outline Package) with 0.5 mm pitch and standard JEDEC MO-153 footprint. Pin 1 is marked by a dot or beveled corner; pins are numbered counter-clockwise from pin 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 14-bit SSTL_2 registered buffer applications.

Compared with IDT74FCT162244ATPAG and MC100EP16DG, PI74SSTV16857AE uniquely provides SSTL_2 I/O compliance, VREF-referenced inputs, and LVCMOS RESET-making it the only viable option for DDR-400 memory subsystems requiring JEDEC-standard signaling and power-up robustness.

Availability

PI74SSTV16857AE is available at Aetrix Electronics and suitable for DDR memory controller interfaces, registered DIMM modules, DDR2 subsystems, and industrial embedded DDR applications requiring stable component supply and long-term lifecycle support.

Supply support for PI74SSTV16857AE 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 logic portfolio remains widely deployed in DDR infrastructure.

The PI74SSTV16857 series belongs to Pericom's high-speed SSTL buffer product line, engineered specifically for DDR memory interface signal integrity, timing margin enhancement, and JEDEC-compliant power-up sequencing.

FAQ

What is the function of the VREF pin on PI74SSTV16857AE?

VREF sets the AC switching threshold for SSTL_2 inputs (D1–D14, CLK, CLK) at VDDQ/2 ±100 mV. It must be externally decoupled with a 0.1 µF capacitor to GND and sourced from a low-noise, well-regulated VDDQ/2 supply-critical for maintaining valid VIH/VIL margins in DDR systems.

Can PI74SSTV16857AE operate with VDD and VDDQ at different voltages?

No. Per the datasheet, VDD and VDDQ must be equal and maintained within 2.3 V–2.7 V. The device does not support split-rail operation; mismatched supplies violate recommended operating conditions and may cause timing violations or latch-up.

Is the RESET pin truly asynchronous, and what happens when it is asserted?

Yes-RESET is fully asynchronous and active-low. When asserted, it forces all Q outputs low, disables all input receivers (D and clock), and holds internal registers in reset regardless of CLK state or VREF stability-ensuring deterministic power-up behavior.

Does PI74SSTV16857AE support DDR3 or DDR4 memory standards?

No. It is specified for DDR and DDR2 applications only, with SSTL_2 I/O levels and timing parameters aligned to JEDEC JESD8-15A (DDR) and JESD8-17 (DDR2). DDR3/DDR4 require SSTL_18 and different timing-this device lacks those voltage and slew-rate specifications.