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Cypress Semiconductor Electronic Components Datasheet

CY7C151xV18 Datasheet

(CY7C1xxxxVxx) RAM9 QDR-I/DDR-I/QDR-II/DDR- II Errata

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CY7C129*DV18/CY7C130*DV25
CY7C130*BV18/CY7C130*BV25/CY7C132*BV25
CY7C131*BV18 / CY7C132*BV18/CY7C139*BV18
CY7C191*BV18/CY7C141*AV18 / CY7C142*AV18/
CY7C151*V18 /CY7C152*V18
May 02, 2007
RAM9 QDR-I/DDR-I/QDR-II/DDR- II Errata
Errata Revision: *C
This document describes the DOFF issue for QDRII/DDRII and the Output Buffer and JTAG issues for
QDRI/DDRI/QDRII/DDRII. Details include trigger conditions, possible workarounds and silicon revision applicability.
This document should be used to compare to the respective datasheet for the devices to fully describe the device
functionality.
www.DataSheePt4lUe.acsoem contact your local Cypress Sales Representative for availability of the fixed devices and any other questions.
Devices Affected
Density & Revision
9Mb - Ram9(90 nm)
9Mb - Ram9(90 nm)
18Mb - Ram9(90nm)
18Mb - Ram9(90nm)
36Mb - Ram9(90nm)
72Mb -Ram9(90nm)
Part Numbers
CY7C130*DV25
CY7C129*DV18
CY7C130*BV18
CY7C130*BV25
CY7C132*BV25
CY7C131*BV18
CY7C132*BV18
CY7C139*BV18
CY7C191*BV18
CY7C141*AV18
CY7C142*AV18
CY7C151*V18
CY7C152*V18
Architecture
QDRI/DDRI
QDRII
QDRI/DDRI
QDRII/DDRII
QDRII/DDRII
QDRII/DDRII
Table 1. List of Affected devices
Product Status
All of the above densities and revisions are available in sample as well as production quantities.
QDR/DDR DOFF Pin, Output Buffer and JTAG Issues Errata Summary
The following table defines the issues and the fix status for the different devices which are affected.
Item
1.
Issue
DOFF pin is used for enabling/dis-
abling the DLL circuitry within the
SRAM. To enable the DLL circuitry,
DOFF pin must be externally tied
HIGH. The QDR-II/DDR-II devices
have an internal pull down resistor of
~5K . The value of the external pull-
up resistor should be 500 or less in
order to ensure DLL is enabled.
Device
9Mb - “D” Rev - Ram9
18Mb - “B” Rev - Ram9
36Mb - “A” Rev - Ram9
72Mb - Ram9
QDR-II/DDR-II Devices
Fix Status
The fix involved removing the in-
ternal pull-down resistor on the
DOFF pin. The fix has been im-
plemented on the new revision
and is now available.
Cypress Semiconductor Corporation • 198 Champion Court • San Jose, CA 95134-1709 • 408-943-2600
Document #: 001-06217 Rev. *C
Revised:- May 02, 2007


Cypress Semiconductor Electronic Components Datasheet

CY7C151xV18 Datasheet

(CY7C1xxxxVxx) RAM9 QDR-I/DDR-I/QDR-II/DDR- II Errata

No Preview Available !

Item
2.
3.
www.DataSheet4U.com
Issue
O/P Buffer enters a locked up unde-
fined state after controls or clocks are
left floating. No proper read/write
access can be done on the device
until a dummy read is performed.
The EXTEST function in the JTAG
test fails when input K clock is floating
in the JTAG mode.
Device
9Mb - “D” Rev - Ram9
18Mb - “B” Rev - Ram9
36Mb - “A” Rev - Ram9
72Mb - Ram9
QDR-I/DDR-I/
QDR-II/DDR-II Devices
9Mb - “D” Rev - Ram9
18Mb - “B” Rev - Ram9
36Mb - “A” Rev - Ram9
72Mb - Ram9
QDR-I/DDR-I/
QDR-II/DDR-II Devices
Fix Status
The fix has been implemented on
the new revision and is now avail-
able.
The fix involved bypassing the ZQ
circuitry in JTAG mode. This was
done by overriding the ZQ circuit-
ry by the JTAG signal. The fix has
been implemented on the new re-
vision and is now available.
Table 2. Issue Definition and fix status for different devices
1. DOFF Pin Issue
• ISSUE DEFINITION
This issue involves the DLL not turning ON properly if a large resistor is used (eg:-10K ) as an external pullup
resistor to enable the DLL. If a 10K or higher pullup resistor is used externally, the voltage on DOFF is not
high enough to enable the DLL.
• PARAMETERS AFFECTED
The functionality of the device will be affected because of the DLL is not turning ON properly. When the DLL
is enabled, all AC and DC parameters on the datasheet are met.
• TRIGGER CONDITION(S)
Having a 10K or higher external pullup resistor for disabling the DOFF pin.
• SCOPE OF IMPACT
This issue will alter the normal functionality of the QDRII/DDRII devices when the DLL is disabled.
EXPLANATION OF ISSUE
Figure 1 shows the DOFF pin circuit with an internal 5K internal resistor. The fix planned is to disable the
internal 5K leaker.
Figure 1. DOFF pin with the 5K internal resistor
• WORKAROUND
Document #: 001-06217 Rev. *C
Page 2 of 8


Part Number CY7C151xV18
Description (CY7C1xxxxVxx) RAM9 QDR-I/DDR-I/QDR-II/DDR- II Errata
Maker Cypress Semiconductor
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