GSI Technology 4Mb Pipelined and Flow Through Synchronous NBT SRAMs are available in 256K x 18 and 128K x 36 configurations. They feature user configurable Pipeline and Flow Through mode, NBT (No Bus Turn Around) functionality, and fully pin compatibility with both pipelined and flow through NtRAM™, NoBL™ and ZBT™ SRAMs.
The GS842Z18/36AB is a 4 Mbit synchronous static SRAM offered by GSI Technology. It supports 256 K×18 and 128 K×36 configurations, with user‑configurable pipeline or flow‑through modes and features such as byte‑write operation, three chip‑enable signals, and an LBO pin for linear or interleaved burst mode.
The device is supplied in a JEDEC‑standard 119‑bump BGA package (RoHS‑compliant) and is available in four speed bins (180, 166, 150, 100 MHz). Detailed pin descriptions, timing tables, truth tables, and state diagrams are included, along with ordering information for each variant.
| Configurations | 256K × 18 and 128K × 36 |
|---|---|
| Core supply voltage | 3.3 V ±10 % |
| I/O supply voltage | 2.5 V or 3.3 V Vpp |
| Package type | JEDEC‑standard 119‑bump BGA (RoHS‑compliant) |
| Cycle time (180 MHz bin) | 5.5 ns |
| Byte write operation | 9‑bit bytes |
| Number of chip‑enable signals | 3 |
It uses a 3.3 V core supply with ±10 % tolerance and can be powered with either 2.5 V or 3.3 V Vpp for the I/O pins.
The device is supplied in a JEDEC‑standard 119‑bump BGA package that is RoHS‑compliant.