4116 DRAM 16K x 1 pinout

DIP-16. Dynamic RAM, 16K x 1 (lower 16K on the Spectrum)

16K x 1 dynamic RAM with three supplies: +12 V (Vdd, pin 8), +5 V (Vcc, pin 9) and -5 V (Vbb, pin 1). Eight make 16 KB. Mostek: Vbb goes on first and off last, and must never be more positive than 0 V while Vdd is applied, so a lost -5 V rail can take out a whole bank. Check all three rails before swapping chips.

Open the interactive 4116 pinout

Pins

PinNameTypeSignal
1Vbbpower-5 V substrate bias (Vbb). Must be present before Vdd.
2DINdataData in. Write data enters here.
3/WEctrlWrite enable (WRITE on the data sheet). LOW writes DIN.
4/RASctrlRow address strobe. Latches the row address; a RAS-only cycle refreshes the row.
5A0addrMultiplexed address bit 0.
6A2addrMultiplexed address bit 2.
7A1addrMultiplexed address bit 1.
8Vddpower+12 V supply (Vdd).
9Vccpower+5 V supply (Vcc).
10A5addrMultiplexed address bit 5.
11A4addrMultiplexed address bit 4.
12A3addrMultiplexed address bit 3.
13A6addrMultiplexed address bit 6.
14DOUTdataData out. Driven while /CAS is LOW on a read, and in read-modify-write and delayed-write cycles until /CAS goes HIGH. High impedance in an early-write cycle and while /CAS is HIGH.
15/CASctrlColumn address strobe. Latches the column address and gates DOUT.
16Vssground0 V.

Fitted in

Sources