May 2012
I have a collection of one and two Meg memory strips from early PCs, with which I would like to make delay lines for digitized audio. I can find no application or pin-out data for the chips; the markings seem inconsistent from strip to strip, and have no manufacturer's name or logo. (I have one set of what I believe to be four Meg strips designated as MT4C4ME8DJ.) I've done Google searches for this style of memory chip to no avail. Can anyone help?
Please log in to post an answer.
This is an old EDO SIMM.
Knowing that — and knowing that MT meant Micron — I did a Google search for "micron edo memory datasheet" and found: www.pjrc.com/mp3/simm/datasheet.html which says (among other things):
4, 8 MEG x 32 DRAM SIMMs (OBSOLETE)
DRAM MODULE
MT8D432(X)
MT16D832(X)
For the latest datasheet revisions, please refer to the Micron website: www.micron.com/mti/msp/html/datasheet.html.
FEATURES
• JEDEC- and industry-standard pin-out in a 72-pin, single in-line memory module (SIMM)
• 16 MB (4 Meg x 32) and 32 MB (8 Meg x 32)
• High performance CMOS silicon-gate process
• Single 5V ±10% power supply
• All inputs, outputs, and clocks are TTL-compatible
• Refresh modes: RAS#-ONLY, CAS#-BEFORE-RAS# (CBR), and HIDDEN
• 2,048 cycle refresh distributed across 32 ms
• Fast Page Mode (FPM) access or Extended Data-Out (EDO) Page Mode access
OPTIONS
Options Marking
Timing
50 ns access -5*
60 ns access -6
Packages
72-pin SIMM M
72-pin SIMM (Gold) G
Operating Modes
FAST PAGE MODE None
EDO PAGE MODE X
*EDO version only
Part Numbers
EDO Operating Mode
Part Number Configuration Plating
MT8D432G- x X 4 Meg x 32 Gold
MT8D432M- x X 4 Meg x 32 Tin/Lead
MT16D832G-x X 8 Meg x 32 Gold
MT16D832M-x X 8 Meg x 32 Tin/Lead
x = speed
FPM Operating Mode
Part Number Configuration Plating
MT8D432G-x 4 Meg x 32 Gold
MT8D432M-x 4 Meg x 32 Tin/Lead
MT16D832G-x 8 Meg x 32 Gold
MT16D832M-x 8 Meg x 32 Tin/Lead
x = speed
Pin Assignment (Front View) See diagram below.
72-Pin SIMM
4 Meg x 32
8 Meg x 32
PIN SYMBOL PIN SYMBOL PIN SYMBOL PIN SYMBOL
1 Vss 19 A10 37 NC 55 DQ12
2 DQ1 20 DQ5 38 NC 56 DQ28
3 DQ17 21 DQ21 39 Vss 57 DQ13
4 DQ 22 DQ6 40 CAS0# 58 DQ29
5 DQ18 23 DQ22 41 CAS2# 59 Vdd
6 DQ3 24 DQ7 42 CAS3# 60 DQ30
7 DQ19 25 DQ23 43 CAS1# 61 DQ14
8 DQ4 26 DQ8 44 RAS0# 62 DQ31
9 DQ20 27 DQ24 45 NC/RAS1#* 63 DQ15
10 VDD 28 A7 46 NC 64 DQ32
11 NC 29 NC (A11) 47 WE# 65 DQ16
12 A0 30 VDD 48 NC 66 NC
13 A1 31 A8 49 DQ9 67 PRD1
14 A2 32 A9 50 DQ25 68 PRD2
15 A3 33 NC/RAS3#* 51 DQ10 69 PRD3
16 A4 34 RAS2# 52 DQ26 70 PRD4
17 A5 35 NC 53 DQ11 71 NC
18 A6 36 NC 54 DQ27 72 Vss
*32 MB version only
If this isn't the right part, then try www.alldatasheet.com/view.jsp?Searchword=MT4C4ME8.
