AN42468 - On-Die Termination for QDR(R) II+/DDR II+ SRAMs | Cypress Semiconductor

AN42468 - On-Die Termination for QDR(R) II+/DDR II+ SRAMs

Last Updated:

May 28, 2020

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AN42468 discusses on-die termination (ODT) scheme, implementation, advantages and power calculation for the QDR¿II+ and DDRII+ family of Synchronous SRAMs on the 65-nm technology devices.

AN42468 discusses on-die termination (ODT) scheme, implementation, advantages and power calculation for the QDRII+ and DDRII+ family of Synchronous SRAMs on the 65-nm technology devices.

ODT has the following advantages:

Improves signal integrity by having termination closer to the device inputs
Simplifies board routing
Saves board space by eliminating external resistors
Reduces cost involved in using external termination resistors

For ODT-enabled QDRII+ and DDRII+ SRAMs, ODT is offered on the following input signals:

Input clocks (K and Kb clocks)
Data input signals
Control signals (Byte Write Select signals)

The figure below shows the ODT implementation for Cypress QDRII+/DDRII+ SRAMs:

Clicking on the link below provides a tool which enables calculation of the Idd current for desired frequency, total Power consumption and Junction temperature for Sync SRAMs

https://www.cypress.com/?docID=23984

Please refer to the respective product datasheets to get the Vdd voltage and Idd current used in the formula.

Translated documents are for reference only. We recommend that you refer to the English-language version of a document if you are engaged in development of a design.

Related Files

File Title	Language	Size	Last Updated
AN42468 On-Die Termination for QDR(R) II+/DDR II+ SRAMs.pdf	English	239.87 KB	05/26/2020
AN42468 On-Die Termination for QDR II+/DDR II+ SRAMs (Chinese).pdf	Chinese	395.23 KB	11/23/2015
AN42468 On-Die Termination for QDR II+/DDR II+ SRAMs (Japanese).pdf	Japanese	415.03 KB	11/23/2015

Related Resources

Application Notes
AN4065 - QDR®-II, QDR-II+, DDR-II, and DDR-II+ Design Guide	05/14/2020
AN6017 - Differences in Implementation of 65 nm QDR™ II/DDR II and QDR II+/DDR II+ Memory Interfaces	11/23/2015
AN4017 - Understanding Temperature Specifications: An Introduction	04/28/2017

Datasheets
CY7C1526KV18, CY7C1513KV18, CY7C1515KV18: 72-Mbit QDR® II SRAM Four-Word Burst Architecture	11/20/2017
CY7C1565KV18: 72-Mbit QDR® II+ SRAM Four-Word Burst Architecture (2.5 Cycle Read Latency)	11/30/2017
CY7C1525KV18, CY7C1512KV18, CY7C1514KV18: 72-Mbit QDR® II SRAM Two-Word Burst Architecture	01/29/2018
CY7C1568KV18, CY7C1570KV18: 72-Mbit DDR II+ SRAM Two-Word Burst Architecture (2.5 Cycle Read Latency)	03/15/2016
CY7C1310JV18, CY7C1910JV18, CY7C1312JV18, CY7C1314JV18: 18-Mbit QDR® II SRAM 2-Word Burst Architecture	05/28/2020
CY7C1548KV18, CY7C1550KV18: 72-Mbit DDR II+ SRAM Two-Word Burst Architecture (2.0 Cycle Read Latency)	01/29/2018
CY7C1543KV18, CY7C1545KV18: 72-Mbit QDR® II+ SRAM Four-Word Burst Architecture (2.0 Cycle Read Latency)	01/29/2018
CY7C15632KV18, 72-Mbit QDR(R) II+ SRAM Four-Word Burst Architecture (2.5 Cycle Read Latency)	05/28/2020
CY7C1248KV18, CY7C1250KV18: 36-Mbit DDR II+ SRAM Two-Word Burst Architecture (2.0 Cycle Read Latency)	01/29/2018
CY7C1411KV18, CY7C1426KV18, CY7C1413KV18, CY7C1415KV18 : 36-Mbit QDR® II SRAM Four-Word Burst Architecture	11/28/2017
CY7C2263KV18, CY7C2265KV18: 36-Mbit QDR® II+ SRAM Four-Word Burst Architecture (2.5 Cycle Read Latency) with ODT	01/06/2016
CY7C2268KV18, CY7C2270KV18: 36-Mbit DDR II+ SRAM Two-Word Burst Architecture (2.5 Cycle Read Latency) with ODT	05/28/2020
CY7C1425KV18, CY7C1412KV18, CY7C1414KV18: 36-Mbit QDR® II SRAM Two-Word Burst Architecture	01/29/2018
CY7C1268KV18, CY7C1270KV18: 36-Mbit DDR II+ SRAM Two-Word Burst Architecture (2.5 Cycle Read Latency)	11/29/2017
CY7C1243KV18/CY7C1245KV18, 36-Mbit QDR® II+ SRAM Four-Word Burst Architecture (2.0 Cycle Read Latency)	02/13/2018
CY7C1263KV18/CY7C1265KV18, 36-Mbit QDR® II+ SRAM Four-Word Burst Architecture (2.5 Cycle Read Latency)	01/29/2018
CY7C1312KV18, CY7C1314KV18 18-Mbit QDR® II SRAM Two-Word Burst Architecture	11/30/2017
CY7C1311KV18, CY7C1911KV18, CY7C1313KV18, CY7C1315KV18: 18-Mbit QDR® II SRAM Four-Word Burst Architecture	02/13/2018
CY7C1163KV18, CY7C1165KV18: 18-Mbit QDR® II+ SRAM Four-Word Burst Architecture (2.5 Cycle Read Latency)	01/29/2018
CY7C1143KV18, CY7C1145KV18: 18-Mbit QDR® II+ SRAM Four-Word Burst Architecture (2.0 Cycle Read Latency)	02/03/2016
CY7C2163KV18/CY7C2165KV18, 18-MBIT QDR(R) II+ SRAM FOUR-WORD BURST ARCHITECTURE (2.5 CYCLE READ LATENCY) WITH ODT	05/28/2020
CY7C1148KV18, CY7C1150KV18: 18-Mbit DDR II+ SRAM Two-Word Burst Architecture (2.0 Cycle Read Latency)	01/29/2018
CY7C1168KV18, CY7C1170KV18: 18-Mbit DDR II+ SRAM Two-Word Burst Architecture (2.5 Cycle Read Latency)	01/29/2018
CY7C2168KV18, CY7C2170KV18: 18-Mbit DDR II+ SRAM Two-Word Burst Architecture (2.5 Cycle Read Latency) with ODT	01/29/2018
CY7C25682KV18, CY7C25702KV18: 72-Mbit DDR II+ SRAM Two-Word Burst Architecture (2.5 Cycle Read Latency) with ODT	03/15/2016
CY7C25442KV18: 72-Mbit QDR® II+ SRAM Two-Word Burst Architecture (2.0 Cycle Read Latency) with ODT	11/28/2017
CY7C25632KV18, CY7C25652KV18: 72-Mbit QDR®II+ SRAM Four-Word Burst Architecture (2.5 Cycle Read Latency) with ODT	11/30/2017
CY7C1643KV18/CY7C1645KV18, 144-Mbit QDR® II+ SRAM Four-Word Burst Architecture (2.0 Cycle Read Latency)	11/29/2017
CY7C1648KV18, CY7C1650KV18: 144-Mbit DDR II+ SRAM Two-Word Burst Architecture (2.0 Cycle Read Latency)	01/29/2018
CY7C1663KV18/CY7C1665KV18, 144-Mbit QDR® II+ SRAM Four-Word Burst Architecture (2.5 Cycle Read Latency)	01/29/2018
CY7C2663KV18, CY7C2665KV18: 144-Mbit QDR® II+ SRAM Four-Word Burst Architecture (2.5 Cycle Read Latency) with ODT	11/27/2017
CY7C2642KV18, CY7C2644KV18: 144-Mbit QDR® II+ SRAM Two-Word Burst Architecture (2.0 Cycle Read Latency) with ODT	01/08/2016
CY7C1613KV18/CY7C1615KV18, 144-MBIT QDR® II SRAM FOUR-WORD BURST ARCHITECTURE	01/29/2018
CY7C2670KV18: 144-Mbit DDR II+ SRAM Two-Word Burst Architecture (2.5 Cycle Read Latency) with ODT	01/29/2018
CY7C1625KV18, CY7C1612KV18, CY7C1614KV18: 144-Mbit QDR® II SRAM Two-Word Burst Architecture	01/06/2021
CY7C2563XV18, CY7C2565XV18: 72-Mbit QDR® II+ Xtreme SRAM Four-Word Burst Architecture (2.5 Cycle Read Latency) with ODT	11/27/2017
CY7C1562XV18, CY7C1564XV18: 72-Mbit QDR® II+ Xtreme SRAM Two-Word Burst Architecture (2.5 Cycle Read Latency)	01/29/2018
CY7C1568XV18, CY7C1570XV18: 72-Mbit DDR II+ Xtreme SRAM Two-Word Burst Architecture (2.5 Cycle Read Latency)	01/29/2018
CY7C2562XV18, CY7C2564XV18: 72-Mbit QDR® II+ Xtreme SRAM Two-Word Burst Architecture (2.5 Cycle Read Latency) with ODT	09/03/2017
CY7C1563XV18, CY7C1565XV18: 72-Mbit QDR® II+ Xtreme SRAM Four-Word Burst Architecture (2.5 Cycle Read Latency)	01/29/2018
CY7C2568XV18, CY7C2570XV18: 72-Mbit DDR II+ Xtreme SRAM Two-Word Burst Architecture (2.5 Cycle Read Latency) with ODT	08/27/2015
CY7C1262XV18, CY7C1264XV18: 36-Mbit QDR® II+ Xtreme SRAM Two-Word Burst Architecture (2.5 Cycle Read Latency)	05/28/2020
CY7C1263XV18, CY7C1265XV18: 36-Mbit QDR® II+ Xtreme SRAM Four-Word Burst Architecture (2.5 Cycle Read Latency)	05/28/2020
CY7C1268XV18, CY7C1270XV18: 36-Mbit DDR II+ Xtreme SRAM Two-Word Burst Architecture (2.5 Cycle Read Latency)	05/28/2020
CY7C2262XV18/CY7C2264XV18, 36-Mbit QDR(R) II+ Xtreme SRAM Two-Word Burst Architecture (2.5 Cycle Read Latency) with ODT	05/28/2020
CY7C2263XV18, CY7C2265XV18: 36-Mbit QDR® II+ Xtreme SRAM Four-Word Burst Architecture (2.5 Cycle Read Latency) with ODT	05/28/2020
CY7C2268XV18/CY7C2270XV18, 36-MBIT DDR II+ XTREME SRAM TWO-WORD BURST ARCHITECTURE (2.5 CYCLE READ LATENCY) WITH ODT	05/28/2020
CYRS1542AV18, CYRS1544AV18: 72-Mbit QDR® II+ SRAM Two-Word Burst Architecture with RadStop™ Technology	05/28/2020
CYRS1543AV18, CYRS1545AV18: 72-Mbit QDR® II+ SRAM Four-Word Burst Architecture with RadStop™ Technology	05/28/2020
CY7C2245KV18: 36-Mbit QDR® II+ SRAM Four-Word Burst Architecture (2.0 Cycle Read Latency) with ODT	05/30/2020
CY7C25422KV18: 72-Mbit QDR® II+ SRAM Two-Word Burst Architecture (2.0 Cycle Read Latency) with ODT	01/29/2018

Other Resources
Active Current (IDD) Calculator	09/23/2011