An HP-48 RAM Card

Description:Contains the schematics and Gerber files needed to create a 128 KB RAM card for the 48SX/GX calculators. Data sheets for the parts used are also included. The Bill of Material calls out specific vendor and vendor part numbers for the passive components used, but any equivalent part in the SMD 0805 package can be substituted. Battery backup is by use of a 12 mm lithium coin cell, either the CR1216 or the CR1225. The CR1225 has the higher capacity rating of the two at 48 mAh. Although that's only half the capacity of a CR2016, the Cypress MoBL SRAM memory device only requires 1 uA in standby mode when the memory is not selected so battery life should be reasonably long.
Filename:hp48ramcard.zip
ID:9039
Current version:1.0
Author:Mark A. Fleming
Downloaded file size:2,163,084 bytes
Platforms:48  
User rating:Not yet rated (you must be logged in to vote)
Primary category:Docs/Misc
Languages:ENG  
File date:2019/06/26 22:03:12
Creation date:2019/06/26
Source code:Not included
Download count:48
Version history:2019/07/20: Added to site
Archive contents:
  Length      Date    Time    Name
---------  ---------- -----   ----
   426773  2019-06-26 15:41   HP48RamCard-master/An HP48 RAM Card.pdf
        0  2019-06-26 15:41   HP48RamCard-master/Board/
        0  2019-06-26 15:41   HP48RamCard-master/Board/Gerber/
      777  2019-06-26 15:41   HP48RamCard-master/Board/Gerber/RAM128Kfull-soic.dri
     5352  2019-06-26 15:41   HP48RamCard-master/Board/Gerber/RAM128Kfull-soic.GBL
     1184  2019-06-26 15:41   HP48RamCard-master/Board/Gerber/RAM128Kfull-soic.GBO
     1755  2019-06-26 15:41   HP48RamCard-master/Board/Gerber/RAM128Kfull-soic.GBS
       95  2019-06-26 15:41   HP48RamCard-master/Board/Gerber/RAM128Kfull-soic.GML
      883  2019-06-26 15:41   HP48RamCard-master/Board/Gerber/RAM128Kfull-soic.gpi
     6343  2019-06-26 15:41   HP48RamCard-master/Board/Gerber/RAM128Kfull-soic.GTL
    10999  2019-06-26 15:41   HP48RamCard-master/Board/Gerber/RAM128Kfull-soic.GTO
     1334  2019-06-26 15:41   HP48RamCard-master/Board/Gerber/RAM128Kfull-soic.GTP
     2578  2019-06-26 15:41   HP48RamCard-master/Board/Gerber/RAM128Kfull-soic.GTS
      564  2019-06-26 15:41   HP48RamCard-master/Board/Gerber/RAM128Kfull-soic.TXT
    13303  2019-06-26 15:41   HP48RamCard-master/Board/PCB Bottom.png
    14160  2019-06-26 15:41   HP48RamCard-master/Board/PCB Top.png
    13799  2019-06-26 15:41   HP48RamCard-master/Board/RAM128Kfull-soic Board.pdf
    18938  2019-06-26 15:41   HP48RamCard-master/Board/RAM128Kfull-soic Schematic.pdf
   281097  2019-06-26 15:41   HP48RamCard-master/Card front and back.jpg
        0  2019-06-26 15:41   HP48RamCard-master/Datasheets/
   556858  2019-06-26 15:41   HP48RamCard-master/Datasheets/001-44517_AN44517_Design_Recommendation_for_Battery-Backed_SRAMs_Using_Cypress_MoBL_SRAMs (1).pdf
    47023  2019-06-26 15:41   HP48RamCard-master/Datasheets/Apem_12102018_MA_Series_.pdf
    77897  2019-06-26 15:41   HP48RamCard-master/Datasheets/BAT-HLD-012-SMT Diagram-1175215.pdf
   822506  2019-06-26 15:41   HP48RamCard-master/Datasheets/Cypress 128Kx8 SRAM 38-05485_CY62128E_MoBL_sup_sup_1-Mbit_128_K_8_Stat-479276.pdf
     1299  2019-06-26 15:41   HP48RamCard-master/LICENSE.md
     6086  2019-06-26 15:41   HP48RamCard-master/README.md
---------                     -------
  2311603                     26 files
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Part of the HP Calculator Archive,
Copyright 1997-2019 Eric Rechlin.