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Home > Products > Integrated Circuits (ICs) > Logic > Specialty Logic

NXP Semiconductors SSTV16857DGG,118

Name: SSTV16857DGG,118
Brand: NXP Semiconductors
SKU: SSTV16857DGG,118
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SSTV16857DGG,118

Manufacturer:: NXP Semiconductors

Category:: Specialty Logic

Package:: 48-TFSOP (0.240", 6.10mm Width)

Datasheet:: SSTV16857DGG,118.pdf

Description:: IC REG DRIVER 14BIT 48TSSOP

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Product details

Overview

SSTV16857DGG,118 from NXP Semiconductors (formerly Philips Semiconductors) is a 14-bit SSTL_2 registered driver with differential clock inputs, designed for DDR SDRAM DIMM address/control buffering. It operates from 2.3 V to 2.7 V, supports 200 MHz clock frequency, features asynchronous RESET, and delivers 2.4 ns typical CLK-to-Q propagation delay under 30 pF load - enabling reliable timing in JEDEC-compliant DDR-200/266 memory modules.

For engineers reviewing the SSTV16857DGG,118 datasheet, SSTV16857DGG,118 pinout, SSTV16857DGG,118 application, or SSTV16857DGG,118 equivalent, key selection criteria include SSTL_2 input/output compatibility, differential clock interface support, 14-bit flow-through register architecture, and TSSOP-48 package suitability for high-density DIMM routing.

Technical Context

The SSTV16857DGG,118 implements a synchronous 14-bit register bank with fully differential CLK+/CLK− inputs and LVCMOS-compatible asynchronous RESET. All 14 data inputs are SSTL_2-compliant with shared VREF reference at 0.5×VDDQ, and outputs drive SSTL_2 Class I loads with VDDQ-referenced output supply.

Its logic behavior follows a positive-edge-triggered register with reset priority: when RESET is LOW, all Q1–Q14 outputs force LOW regardless of clock state. The device requires VDDQ ≤ VCC and supports common-mode clock input range of 0.97 V to 1.53 V with ≥360 mV peak-to-peak differential swing for reliable latching.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply voltage (VCC)	2.3 V to 2.7 V - defines operating window for core logic; must be ≥ VDDQ
Output supply (VDDQ)	2.3 V to 2.7 V - powers SSTL_2 output drivers; sets VREF = 0.5 × VDDQ
Max clock frequency	200 MHz - supports DDR-200 operation with t_w ≥ 1.0 ns pulse width
CLK-to-Q delay	2.4 ns typical (CL = 30 pF, VDDQ = 2.5 V) - enables tight setup/hold timing margins in DIMM layouts
Input capacitance	2.9 pF - low loading on upstream memory controller signals
RESET propagation delay	2.0–4.0 ns (to Qn) - ensures fast, deterministic register clearing during initialization
VREF tolerance	1.15 V to 1.35 V - matches JEDEC SSTL_2 specification for 2.5 V VDDQ

Pinout & Package

TSSOP-48 package (SOT362-1), 6.1 mm body width, 0.5 mm lead pitch, surface-mount compatible with standard reflow profiles.

Pin/Terminal	Circuit Role	Design Meaning
D1–D14	SSTL_2 data inputs	14-bit parallel address/control bus inputs referenced to shared VREF
Q1–Q14	SSTL_2 data outputs	Registered outputs driving DDR SDRAM module inputs; Class I compliant
CLK+, CLK−	Differential clock inputs	Accepts LVDS-like differential pair; enables noise-immune clock distribution on DIMMs
RESET	LVCMOS asynchronous master reset	Active-Low signal forcing all Qn outputs LOW independent of clock edge
VREF	SSTL_2 input reference	Single external reference node set to 0.5 × VDDQ for all 14 inputs
VCC	Core logic supply	Must be ≥ VDDQ; powers internal registers and control logic
VDDQ	Output driver supply	Directly sets output high/low voltage levels and VREF target
GND	Ground reference	Multiple dedicated pins (13 total) minimize ground bounce in high-speed switching

Key Features

Feature	Design Value
Stub-series terminated logic (SSTL_2)	Enables impedance-matched 2.5 V signaling for DDR SDRAM control/address buses with minimal reflections
Flow-through architecture	Eliminates internal signal routing detours - simplifies PCB trace length matching and reduces skew across 14 bits
Differential clock interface	Rejects common-mode noise on DIMM clock lines, improving jitter margin over single-ended alternatives
Asynchronous RESET	Guarantees known output state at power-up or system reset without requiring stable clock input
JESD8–9 compliance	Ensures interoperability with other SSTL_2 components in JEDEC-standardized DDR memory subsystems

Applications

DDR SDRAM DIMM Address Buffering	DDR SDRAM DIMM Control Signal Distribution
Use Scenario: Driving row/column address and bank select signals from memory controller to multiple DDR SDRAM chips on a 184-pin DIMM. IC Role / Device Role / Timing Role: Registered SSTL_2 buffer that retimes and fans out address/control signals with deterministic 2.4 ns propagation delay. Use Value: Prevents timing skew and signal integrity degradation across 14-bit wide bus, enabling stable 200 MHz DDR operation.	Use Scenario: Distributing command signals (RAS, CAS, WE, CKE) to all DRAM devices on a dual-rank DDR module. IC Role / Device Role / Timing Role: Synchronous register with differential clock input synchronizes command delivery across ranks and devices. Use Value: Eliminates race conditions between command and clock edges, ensuring reliable DDR command decoding.
JEDEC-Compliant Memory Module Design	DDR-200/266 System Interoperability
Use Scenario: Implementing standardized DIMM topology per JEDEC specification JESD79 for DDR SDRAM modules. IC Role / Device Role / Timing Role: Drop-in replacement for SSTL16877 with identical form, fit, and function in registered DIMM designs. Use Value: Enables direct compliance with JEDEC DIMM layout rules without custom timing analysis or layout revision.	Use Scenario: Supporting DDR-200 (100 MHz clock) and DDR-266 (133 MHz clock) burst rates in desktop/server memory subsystems. IC Role / Device Role / Timing Role: Provides full 200 MHz clock capability with t_su = 0.2 ns and t_h = 0.75 ns, meeting DDR-266 timing budgets. Use Value: Allows single BOM part to serve both DDR-200 and DDR-266 modules, reducing inventory complexity.

DDR SDRAM DIMM Address Buffering

DDR SDRAM DIMM Control Signal Distribution

Use Scenario: Driving row/column address and bank select signals from memory controller to multiple DDR SDRAM chips on a 184-pin DIMM.

IC Role / Device Role / Timing Role: Registered SSTL_2 buffer that retimes and fans out address/control signals with deterministic 2.4 ns propagation delay.

Use Value: Prevents timing skew and signal integrity degradation across 14-bit wide bus, enabling stable 200 MHz DDR operation.

Use Scenario: Distributing command signals (RAS, CAS, WE, CKE) to all DRAM devices on a dual-rank DDR module.

IC Role / Device Role / Timing Role: Synchronous register with differential clock input synchronizes command delivery across ranks and devices.

Use Value: Eliminates race conditions between command and clock edges, ensuring reliable DDR command decoding.

JEDEC-Compliant Memory Module Design

DDR-200/266 System Interoperability

Use Scenario: Implementing standardized DIMM topology per JEDEC specification JESD79 for DDR SDRAM modules.

IC Role / Device Role / Timing Role: Drop-in replacement for SSTL16877 with identical form, fit, and function in registered DIMM designs.

Use Value: Enables direct compliance with JEDEC DIMM layout rules without custom timing analysis or layout revision.

Use Scenario: Supporting DDR-200 (100 MHz clock) and DDR-266 (133 MHz clock) burst rates in desktop/server memory subsystems.

IC Role / Device Role / Timing Role: Provides full 200 MHz clock capability with t_su = 0.2 ns and t_h = 0.75 ns, meeting DDR-266 timing budgets.

Use Value: Allows single BOM part to serve both DDR-200 and DDR-266 modules, reducing inventory complexity.

Equivalent & Alternatives

The following parts are listed as comparable options for similar registered SSTL_2 driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74SSTVF16857RGYR	TI version in VQFN-48; identical 14-bit SSTL_2 functionality but with different thermal pad and moisture sensitivity level	Same DDR DIMM use case; requires PCB footprint adaptation due to QFN vs. TSSOP	Select when board space constraints favor QFN or when TI supply chain alignment is required
74FCT16857CTPAG	IDT part uses LVTTL inputs and outputs (not SSTL_2); lacks differential clock support and VREF input	Only suitable for legacy SDR SDRAM or non-JEDEC memory interfaces; not DDR-compatible	Choose only for cost-sensitive SDR systems where SSTL_2 compliance is unnecessary

Compared with SN74SSTVF16857RGYR and 74FCT16857CTPAG, the SSTV16857DGG,118 uniquely combines JEDEC SSTL_2 compliance, differential clock interface, and TSSOP-48 packaging - making it the only option qualified for production DDR-200/266 DIMMs requiring strict signal integrity and standard footprint adherence.

Availability

SSTV16857DGG,118 is available at Aetrix Electronics and suitable for DDR SDRAM DIMM manufacturing, memory subsystem design, and industrial embedded memory upgrades requiring stable component supply and long-term obsolescence management.

Supply support for SSTV16857DGG,118 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

NXP Semiconductors is a global semiconductor company formed from the spin-off of Philips Semiconductors in 2006, specializing in secure connectivity solutions for automotive, industrial, and communication markets.

The SSTV16857DGG,118 belongs to NXP's legacy memory interface portfolio, developed specifically to meet JEDEC DDR SDRAM DIMM requirements for registered address/control buffering with SSTL_2 signaling.

FAQ

What is the correct VREF voltage for SSTV16857DGG,118 in a 2.5 V DDR system?

The SSTV16857DGG,118 requires VREF = 0.5 × VDDQ. For a nominal 2.5 V VDDQ, VREF must be set to 1.25 V, with allowable range of 1.15 V to 1.35 V per JEDEC SSTL_2 specification. This reference voltage is shared across all 14 data inputs and must be externally supplied with low-noise regulation to maintain input threshold stability. The SSTV16857DGG,118 does not generate VREF internally.

Does SSTV16857DGG,118 support DDR-266 (133 MHz clock) operation?

Yes, the SSTV16857DGG,118 supports up to 200 MHz clock frequency, which exceeds the 133 MHz fundamental clock requirement for DDR-266 (266 MT/s). Its timing specifications - including t_su = 0.2 ns and t_h = 0.75 ns - are validated across 0 °C to +70 °C and ensure reliable operation in DDR-266 DIMMs when used with proper termination and layout. The SSTV16857DGG,118 is explicitly cited in Philips documentation as part of a "full DDR 200/266 solution."

Can SSTV16857DGG,118 be used without a differential clock source?

No - the SSTV16857DGG,118 requires a true differential clock pair (CLK+ and CLK−) for correct operation. Its internal circuitry relies on differential sensing to reject noise and guarantee edge detection; single-ended clocking violates the input common-mode range (0.97 V to 1.53 V) and may cause metastability or erratic output behavior. The SSTV16857DGG,118 is not compatible with single-ended clock sources unless an external differential receiver is added.

What is the maximum capacitive load supported by SSTV16857DGG,118 outputs?

The SSTV16857DGG,118 is characterized for Class I SSTL_2 loads with CL = 10 pF and CL = 30 pF. Its output drivers are rated for ±20 mA sink/source current, supporting typical DIMM trace + DRAM pin capacitance up to ~30 pF per output. Exceeding this load increases propagation delay and degrades edge rate; for heavier loads, parallel devices or active termination should be considered. The SSTV16857DGG,118 datasheet specifies t_PLH/t_PHL = 2.4 ns only at CL = 30 pF.

Is SSTV16857DGG,118 pin-compatible with SSTL16877?

Yes - the SSTV16857DGG,118 is explicitly stated in its datasheet to have "same form, fit, and function as SSTL16877," confirming mechanical and electrical pin compatibility in TSSOP-48 packages. Both devices share identical pin numbering, function mapping (D1–D14, Q1–Q14, CLK±, RESET, VREF, VCC, VDDQ, GND), and timing behavior, enabling drop-in replacement in existing DIMM designs without PCB modification.

SSTV16857DGG,118 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: 74SSTV

Package/Case:: 48-TFSOP (0.240", 6.10mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Logic Type:: Registered Buffer with SSTL_2 Compatible I/O for DDR

Supply Voltage:: 2.3V ~ 2.7V

Number of Bits:: 14

Operating Temperature:: 0°C ~ 70°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 48-TSSOP

SSTV16857DGG,118 FAQ

1.How can I place an order for SSTV16857DGG,118 through Aetrix?

Please submit a Request for Quotation (RFQ) for SSTV16857DGG,118 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 SSTV16857DGG,118 reliable?

The price and inventory of SSTV16857DGG,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SSTV16857DGG,118 is usually 5 days.

3.What payment methods are accepted for SSTV16857DGG,118?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SSTV16857DGG,118 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SSTV16857DGG,118?

SSTV16857DGG,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SSTV16857DGG,118 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 SSTV16857DGG,118?

For technical support, including SSTV16857DGG,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SSTV16857DGG,118 requirements.

6.How does Aetrix verify that SSTV16857DGG,118 is sourced from the original manufacturer or authorized distributors?

All SSTV16857DGG,118 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 SSTV16857DGG,118 meets industry standards.

7.What is the process for return or replacement of SSTV16857DGG,118?

All SSTV16857DGG,118 units undergo pre-shipment inspection (PSI). If there is an issue with SSTV16857DGG,118, 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 SSTV16857DGG,118 part is unused and in its original packaging.

Return procedure for SSTV16857DGG,118:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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