4532 / 3732 DRAM 32K x 1 (upper 32K) pinout

DIP-16. Upper 32K on the 48K Spectrum

TI TMS 4532 or OKI MSM3732: 64K x 1 dies with one half disabled, +5 V only, 4164 pinout. Eight make the upper 32K at $8000-$FFFF. Board links pick the maker (TI/OKI) and the working half (-3/-4 or -H/-L), so every chip must carry the same part number and the links must match. No TMS 4532 data sheet was found; the pinout follows the OKI MSM3732 and the TMS 4164. A crash above $8000 points here.

Open the interactive 4532 pinout

Pins

Pin	Name	Type	Signal
1	NC	nc	No internal connection.
2	DIN	data	Data in.
3	/WE	ctrl	Write enable (W on the TI sheet).
4	/RAS	ctrl	Row address strobe, from the IC23/IC24 decode.
5	A0	addr	Multiplexed address bit 0.
6	A2	addr	Multiplexed address bit 2.
7	A1	addr	Multiplexed address bit 1.
8	VCC	power	+5 V, the only supply.
9	A7	addr	Multiplexed address bit 7. On a half-good part this bit picks the working half; the Spectrum links fix it to match the chip type.
10	A5	addr	Multiplexed address bit 5.
11	A4	addr	Multiplexed address bit 4.
12	A3	addr	Multiplexed address bit 3.
13	A6	addr	Multiplexed address bit 6.
14	DOUT	data	Data out, three-state (Q on the TI sheet).
15	/CAS	ctrl	Column address strobe.
16	VSS	ground	0 V.

Fitted in

ZX Spectrum 48K IC15-IC22

4532 / 3732 DRAM 32K x 1 (upper 32K) pinout

Pins

Fitted in

Sources