GS8642Z36GB-250I - 72Mb Sync ZBT SRAM 250MHz 119-FPBGA | GSI
MPN: GS8642Z36GB-250I ✓ Hoạt độngGS8642Z36GB-250I Tóm tắt
A Zero Bus Turnaround (ZBT) SRAM is a synchronous static memory device that allows the data bus to switch direction between read and write operations without inserting idle (deselect) cycles, thereby utilizing 100% of the available bus bandwidth. ZBT sits within the broader family of synchronous SRAMs (sync SRAM) and is a subclass of network-optimized memories used in routers, switches, and base-station line cards where sustained throughput on packet buffers and look-up tables is critical.
Key features of the GS8642Z36GB-250I include HSTL-compatible I/O, on-chip delay-line matching for clock and data edges, byte-write enable controls (BWa# through BWd#) for partial-word operations, an active-low chip enable (ZZ#) for low-power standby, and an industrial operating temperature grade (the suffix "I"). The 2Mx36 word width is well matched to 36-bit datapaths in ASICs, NPUs, and traffic-manager ICs, and the JTAG boundary-scan port supports board-level test.
The device is fabricated in a CMOS process with a 6-transistor (6T) memory cell and uses a pipelined or flow-through internal architecture selected by mode pins, giving designers the ability to trade latency for operating frequency. The 119-FPBGA package is optimized for high-density SMT assembly and provides a low-inductance power/ground distribution that supports the 250 MHz clock rate without excessive SSO noise. Synchronous clocking, registered outputs, and ZBT hand-off together remove the one-cycle dead time that legacy async SRAMs impose on tightly-coupled CPU buses.
Typical applications for the GS8642Z36GB-250I include network switch/router data-plane packet buffers, ATM/SONET/SDH line-card FIFOs, high-speed lookup-table memory for CAM co-processors, and ASIC/NPU scratch-pad buffers. Designers also deploy this part in high-end imaging and DSP engines where 36-bit pixel or coefficient words are common. The wide x36 organization is particularly useful when parallel arithmetic datapaths must be stored and retrieved without byte-stitching glue logic.
When designing with this part, observe the 119-FPBGA land-pattern recommendations for solder paste and via-in-pad, provide a low-impedance 2.5 V/3.3 V plane with local 0.1 µF + 10 µF decoupling, and respect the derating curves on VDD vs cycle time. The "I" suffix confirms an industrial -40°C to +85°C operating range; choose the non-"I" variant only for commercial-temperature builds. JTAG should be enabled in production boundary-scan test fixtures but can be left NC for normal operation.
This page synthesizes distributor pricing, same-brand drop-in alternatives, design notes, and a comparison matrix not consolidated in the GSI datasheet, helping sourcing engineers and hardware designers validate the GS8642Z36GB-250I for their ZBT SRAM socket.
Bộ thay thế dễ dàng lắp đặt cho GS8642Z36GB-250I — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
GS8642Z36GB-250IV
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
GS8642Z36GB-200I
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
GS8642Z36GB-167I
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
GS8642Z36GB-150I
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
GS8642Z36GB-250I Tỷ lệ tối đa & tính chất điện
| Kiểu bộ nhớ | Synchronous ZBT SRAM (NBT) |
| Memory Density | 72 Mbit (2M x 36) |
| Tổ chức | 2M words x 36 bits |
| Operating Modes | Pipelined / Flow-Through selectable |
| Giao diện | Parallel, synchronous |
| Max Clock Frequency | 250 MHz |
| Access Time (Flow-Through) | 6.5 ns |
| Access Time (Pipelined) | 2.5 ns |
| Điện áp cung cấp | 2.5 V / 3.3 V |
| I/O Standard | HSTL-compatible |
| Hộp | 119-FPBGA (22 x 14 mm) |
| Kiểu lắp đặt | Surface Mount |
| Nhiệt độ hoạt động | -40 °C to +85 °C (Industrial, "I" suffix) |
| Special Features | ZBT, byte write enables, JTAG boundary-scan, low-power ZZ# standby |
| Trạng thái RoHS | Compliant |
Hướng dẫn cấu hình chân GS8642Z36GB-250I 119-fpbga (22 x 14 mm)
Cấu hình chân cho GS8642Z36GB-250I (119-fpbga (22 x 14 mm) gói). IC số này bao gồm chân GPIO, giao diện truyền thông (UART, SPI, I2C) và chân nguồn. Tham khảo tài liệu thông số kỹ thuật của nhà sản xuất để biết các chức năng chân thay thế và tùy chọn cấu hình. Cực kỳ quan trọng cho thiết kế hệ thống tích hợp và lập trình PCB.
Không có dữ liệu chân cụ thể sẵn có cho GS8642Z36GB-250I.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
GS8642Z36GB-250I phù hợp cho 6 Áp dụngs: Network Switch / Router Packet Buffer, ATM / SONET / SDH Line-Card FIFO, ASIC / NPU Scratch-Pad Memory, High-Speed Lookup-Table Memory (CAM co-processor), High-End Imaging / DSP Engine Frame Buffer, Industrial Test & Measurement Instrument Buffer.
Network Switch / Router Packet Buffer
The GS8642Z36GB-250I is ideally suited as a 36-bit-wide packet buffer on 10 GbE-class network switch and router line cards, where its 250 MHz synchronous interface and ZBT (Zero Bus Turnaround) architecture sustain full line-rate read/write hand-off between the ASIC/NPU and external memory. The 2Mx36 organization stores one or two 9-byte cells per address with minimal glue logic, and the 2.5 ns pipelined access keeps latency low for store-and-forward engines. Industrial-temperature grade ("I" suffix) is appropriate for thermally constrained switch chassis.
Được đề xuất
ATM / SONET / SDH Line-Card FIFO
The GS8642Z36GB-250I provides the high-speed FIFO backbone for legacy and next-generation telecom line cards handling ATM cells, SONET/SDH frames, and OTN tributary maps. Its 2Mx36 depth holds the equivalent of >130 K ATM cells, while the synchronous 250 MHz clock matches OC-48/STM-16 onward bit rates with margin. ZBT eliminates the wasted idle cycles that legacy async SRAMs impose on tightly clocked telecom datapaths, improving effective throughput per watt.
Được đề xuất
ASIC / NPU Scratch-Pad Memory
When paired with a network processor or traffic-manager ASIC, the GS8642Z36GB-250I acts as a low-latency scratch-pad for queue descriptors, statistic counters, and routing-table staging. The 2.5 ns pipelined access supports single-cycle reads at 250 MHz, and the byte-write enables (BWa#–BWd#) allow partial descriptor updates without read-modify-write overhead. Compared with external DRAM, this ZBT SRAM avoids refresh gaps and tRCD penalties for deterministic real-time behavior.
Được đề xuất
High-Speed Lookup-Table Memory (CAM co-processor)
In content-addressable memory co-processor subsystems, the GS8642Z36GB-250I holds the auxiliary lookup tables (VLAN, MPLS label, ACL) that feed CAM lookups. The x36 width aligns with 32-bit table entries plus parity/ECC bits, and ZBT enables the CAM controller to issue back-to-back reads and writes without wasted cycles. Industrial temperature rating supports thermally dense multi-CAM boards deployed in chassis and aggregation routers.
Được đề xuất
High-End Imaging / DSP Engine Frame Buffer
The 36-bit data width of the GS8642Z36GB-250I is well matched to imaging and DSP pipelines that operate on 32-bit pixels/coefficients plus 4-bit overflow/flags. The 250 MHz synchronous interface supports 720p/1080p real-time video processing engines and radar FFT working buffers. ZBT deterministic turnaround allows seamless ping-pong buffer hand-off between DSP kernels without throughput loss from idle bus cycles.
Được đề xuất
Industrial Test & Measurement Instrument Buffer
For bench-top and rack-mounted test equipment such as oscilloscopes, logic analyzers, and protocol analyzers, the GS8642Z36GB-250I functions as a deep sample buffer. The 2M address depth accommodates long capture windows at high sample rates, while ZBT allows the acquisition engine to write and the display engine to read concurrently. Industrial-temperature operation and JTAG boundary-scan support simplify board bring-up and factory test.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho GS8642Z36GB-250I — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | GS8642Z36GB-250IV | GS8642Z36GB-200I | GS8642Z36GB-167I | GS8642Z36GB-150I |
|---|---|---|---|---|---|
| Brand | GSI Technology | GSI Technology | GSI Technology | GSI Technology | GSI Technology |
| Package | 119-FPBGA (22x14) | 119-FPBGA (22x14) | 119-FPBGA (22x14) | 119-FPBGA (22x14) | 119-FPBGA (22x14) |
| Memory Density | 72 Mbit (2M x 36) | 72 Mbit (2M x 36) | 72 Mbit (2M x 36) | 72 Mbit (2M x 36) | 72 Mbit (2M x 36) |
| Max Clock Frequency | 250 MHz | 250 MHz | 200 MHz | 167 MHz | 150 MHz |
| Operating Temperature | -40 °C to +85 °C (Industrial) | -40 °C to +85 °C (Industrial) | -40 °C to +85 °C (Industrial) | -40 °C to +85 °C (Industrial) | -40 °C to +85 °C (Industrial) |
| Supply Voltage | 2.5 V / 3.3 V | 2.5 V / 3.3 V | 2.5 V / 3.3 V | 2.5 V / 3.3 V | 2.5 V / 3.3 V |
| Architecture | ZBT (Zero Bus Turnaround) | ZBT | ZBT | ZBT | ZBT |
| Byte Write Enables | Yes (BWa#–BWd#) | Yes | Yes | Yes | Yes |
Bảo phân biệt quan trọng
- Highest speed grade in the GS8642Z36GB family (vsGS8642Z36GB-200I)
- Full ZBT architecture with no bus-turnaround dead cycles (vsStandard async SRAM)
- Wide x36 organization reduces glue logic for 32-bit datapaths (vsx32 or x18 ZBT SRAMs)
Ghi chú thiết kế
The 119-FPBGA uses a 1.27 mm ball pitch and requires a controlled-impedance breakout on the top layer with via-in-pad for clean 250 MHz signaling. Use microvia stacks (4–6 mil laser vias) for fan-out to inner ground/power planes, and place 0.1 µF X7R decoupling caps within 100 mil of every VDD/VSS pair. HSTL signaling with 0.75 V VTT reference requires a matched termination resistor network (typically 50 Ω to VTT) at the far end of the bus to suppress overshoot at the 250 MHz edge rate.
At 250 MHz, the GS8642Z36GB-250I's HSTL outputs should be routed as a 50 Ω controlled-impedance transmission line with maximum stub length below 150 mil. The 36-bit-wide data bus benefits from matched-length matching (±25 mil) within each byte lane to preserve setup/hold margin. Series damping resistors (10–22 Ω) near the driver may be needed if the bus exceeds 2 inches of cumulative length to dampen reflections from the 119-FPBGA's inductance.
Do not confuse the GS8642Z36GB-250I (industrial -40 °C to +85 °C) with the GS8642Z36GB-250 (commercial 0 °C to +70 °C) — the part number suffix "I" is the temperature designator. Also note that pipelined mode incurs one extra cycle of latency versus flow-through mode; if your FPGA/ASIC expects single-cycle read latency, you must select flow-through mode at power-up via the mode pins. Forgetting to assert ZZ# (low-power standby) high during idle windows can prevent the part from entering sleep, increasing standby current beyond spec.
Thông tin tuân thủ
RoHS and lead-free confirmed per GSI product page. Not AEC-Q100 qualified - part targets networking and industrial use, not automotive. REACH compliance confirmed.
