4416 DRAM 16K×4 pinout
DIP-18. C16 main RAM (2 chips = 16 KB); C128 VDC video RAM
Four bits wide, 16K deep, with a separate output enable on pin 1. Two of them are the C16's whole 16 KB; the TED drives /RAS, /CAS and the multiplexed address through two 74LS257s. On the C128 two hold the 8563 VDC's 16 KB screen memory. Single +5 V supply. Vendors listed: TI TMS4416, Fujitsu MB81416, Mitsubishi M5M4416P, Hitachi HM48416AP.
Open the interactive 4416 pinoutPins
| Pin | Name | Type | Signal |
|---|---|---|---|
| 1 | /G | ctrl | Output enable (C16 SM: /ENABLE). |
| 2 | DQ1 | data | Data in/out bit 0 (C16 SM D0). |
| 3 | DQ2 | data | Data in/out bit 1 (D1). |
| 4 | /W | ctrl | Write enable. |
| 5 | /RAS | ctrl | Row address strobe. UNVERIFIED |
| 6 | A6 | addr | Multiplexed address bit 6. |
| 7 | A5 | addr | Multiplexed address bit 5. |
| 8 | A4 | addr | Multiplexed address bit 4. |
| 9 | VDD | power | +5 V supply. |
| 10 | A7 | addr | Multiplexed address bit 7. |
| 11 | A3 | addr | Multiplexed address bit 3. |
| 12 | A2 | addr | Multiplexed address bit 2. |
| 13 | A1 | addr | Multiplexed address bit 1. |
| 14 | A0 | addr | Multiplexed address bit 0. |
| 15 | DQ3 | data | Data in/out bit 2 (D2). |
| 16 | /CAS | ctrl | Column address strobe. |
| 17 | DQ4 | data | Data in/out bit 3 (D3). |
| 18 | VSS | ground | 0 V. |
Fitted in
- Commodore 16 U5, U6
- Commodore 128 U23, U25 (8563 video RAM)
- Timex Sinclair 2068 U6, U7 (video RAM, TMS4416-15); U12, U13, U17, U18 (upper 32K, TMS4416-20)