Question: What are the pin considerations while upgrading from a 4-Meg (CY7C0852V/AV) Dual-Port to a 9-Meg (CY7C0853V/AV) Dual-Port?

Answer:

The CY7C0852V/AV and CY7C0853V/AV are 4 - Meg and 9 - Meg synchronous dual ported SRAMs. Both these devices are available in 172-BGA packages and hence one can easily upgraded from a 4-Meg CY7C0852V/AV to a 9-Meg CY7C0853V/AV without having to respin the board. The upgrade only requires the use of a few zero-ohm resistors to change the configuration of a few pins . The pins to be considered for such an upgrade are discussed in the table below:

0852 ball | 0852 Name | 0853 Name | CY7C0852V/AV | CY7C0853V/AV |

A12 | /CNTINTR | N/C | Series Zero-Ohm Resistor | No Connect |

A3 | /CNTINTL | N/C | Series Zero-Ohm Resistor | No Connect |

C1 | NC | A17L | No Connect | Series Zero-Ohm Resistor |

C14 | NC | A17R | No Connect | Series Zero-Ohm Resistor |

The following pins require two zero ohm resistors connected as specified in the table. One zero-ohm resistor should be in series with these pins to their respective control signals. The other zero-ohm resistor should lead from these pins to Vdd/Vss. | ||||

E3 | CE1L | Vdd | Series Zero-Ohm Resistor | Zero-Ohm to Vdd |

E12 | CE1R | Vdd | Series Zero-Ohm Resistor | Zero-Ohm to Vdd |

G4 | /CE0L | Vss | Series Zero-Ohm Resistor | Zero-Ohm to Vss |

G11 | /CE0R | Vss | Series Zero-Ohm Resistor | Zero-Ohm to Vss |

J4 | /ADSL | Vss | Series Zero-Ohm Resistor | Zero-Ohm to Vss |

J11 | /ADSR | Vss | Series Zero-Ohm Resistor | Zero-Ohm to Vss |

K4 | /CNTRSTL | Vdd | Series Zero-Ohm Resistor | Zero-Ohm to Vdd |

K11 | /CNTRSTR | Vdd | Series Zero-Ohm Resistor | Zero-Ohm to Vdd |

L1 | CNT/MSKbL | Vdd | Series Zero-Ohm Resistor | Zero-Ohm to Vdd |

L14 | CNT/MSKbR | Vdd | Series Zero-Ohm Resistor | Zero-Ohm to Vdd |

L3 | /CNTENL | Vss | Series Zero-Ohm Resistor | Zero-Ohm to Vss |

L12 | /CNTENR | Vss | Series Zero-Ohm Resistor | Zero-Ohm to Vss |

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