MT48LC8M16A2P-75IT - 128Mb SDRAM 8Mx16 133MHz 54-TSOP II
MPN: MT48LC8M16A2P-75IT ✗ Cuối đờiMT48LC8M16A2P-75IT Tóm tắt
An SDRAM is a dynamic random-access memory synchronized to a system clock, internally divided into multiple banks that allow interleaved read/write bursts. SDRAM sits in the memory hierarchy between processor registers and bulk storage, displacing older asynchronous DRAM by adding burst-mode access, programmable CAS latency, and pipeline-friendly timing. SDRAM is the predecessor of DDR SDRAM and is now used primarily for legacy systems, industrial controllers, and cost-sensitive embedded designs where compatibility outranks raw data rate.
Key features of the MT48LCM16A2P family include 4 internal banks (BA0/BA1), programmable burst lengths of 1, 2, 4, 8 or full-page, programmable CAS latency of 2 or 3, auto-refresh and self-refresh modes, and a 64 ms refresh period (8192 refresh cycles). The 16-bit data bus with two-byte DQ masking (LDQM/UDQM) simplifies 16-bit and 32-bit host connections. A 5.4 ns random access (tAC) supports high-throughput page-mode bursts.
The device uses a 3.3 V CMOS process with internal VREF and clock-alignment, an on-chip delay-locked loop is NOT present (this is an SDR part, not DDR). It conforms to the JEDEC 54-TSOP II 0.400" outline. The package carries a single die routed to bond pads, then to 54 gull-wing leads on 0.8 mm pitch; the pinout follows the JEDEC 54-TSOP-II 8Mx16 standard with one additional pin reserved (NC).
Typical applications include embedded industrial controllers, legacy networking line cards, point-of-sale terminals, printers, medical instrumentation, and replacement of older 128Mbit SDRAM designs. The wide industrial temperature grade suits outdoor or factory-floor deployments, and the 128Mb density matches the working memory size of older PowerPC, MIPS, ARM7/ARM9 SoCs that natively support SDRAM.
When designing with this part, populate VDD and VSSQ with 0.1 uF + 10 uF decoupling placed within 5 mm of each supply pin, and tie CKE high during normal operation. PCB layout must route clocks with 50 ohm controlled impedance and keep DQs byte-grouped to maintain skew budget; unmatched traces cause burst errors at 133 MHz.
This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes not found in the manufacturer datasheet alone, helping engineers select between industrial/commercial temperature grades, speed bins, and modern replacements.
Bộ thay thế dễ dàng lắp đặt cho MT48LC8M16A2P-75IT — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với MT48LC8M16A2P-75IT (cùng hình factor và footprint) — khác nhau ở Burst Length, Interface, Memory Type, Operating Temperature, Organization.
MT48LC8M16A2P-75IT:G
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MT48LC8M16A2P-75IT:GTR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MT48LC8M16A2P-75IT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →AS4C8M16SA-7TCN
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
IS42S81600F-7TL
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
W9825G6KH-6
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MT48LC8M16A2P-75IT Tỷ lệ tối đa & tính chất điện
| Kiểu bộ nhớ | Synchronous DRAM (SDRAM) |
| Density | 128 Mbit |
| Tổ chức | 8M x 16 |
| Supply Voltage (VDD/VDDQ) | 3.3 V |
| Clock Frequency | 133 MHz |
| Speed Grade | -75 (7.5 ns tCK) |
| Random Access Time (tAC) | 5.4 ns |
| Latency CAS | Programmable 2 or 3 |
| Burst Length | 1 / 2 / 4 / 8 / Full Page |
| Internal Banks | 4 (BA0, BA1) |
| Giao diện | Parallel LVTTL |
| Bề rộng đường dữ liệu | 16 bits (with LDQM/UDQM byte masking) |
| Refresh | Auto-refresh / Self-refresh, 64 ms / 8192 cycles |
| Nhiệt độ hoạt động | -40C to +85C (IT grade) |
| Hộp | 54-pin TSOP II, 0.400" outline, 0.8 mm pitch |
| Kiểu lắp đặt | Surface Mount |
| Lead Finish | Lead-free (per FindIC description) |
| Compliance | RoHS compliant |
Cấu hình chân MT48LC8M16A2P-75IT
| Chân 1 | VSS — Ground |
| Chân 2 | DQ0 — Data I/O, bit 0 |
| Chân 3 | DQ1 — Data I/O, bit 1 |
| Chân 4 | DQ2 — Data I/O, bit 2 |
| Chân 5 | DQ3 — Data I/O, bit 3 |
| Chân 6 | VDDQ — DQ power supply, 3.3V |
| Chân 7 | DQ4 — Data I/O, bit 4 |
| Chân 8 | DQ5 — Data I/O, bit 5 |
| Chân 9 | DQ6 — Data I/O, bit 6 |
| Chân 10 | DQ7 — Data I/O, bit 7 |
| Chân 11 | VSSQ — DQ ground |
| Chân 12 | LDQM — Lower byte DQ mask enable |
| Chân 13 | WE# — Write enable, active low |
| Chân 14 | CAS# — Column address strobe, active low |
| Chân 15 | RAS# — Row address strobe, active low |
| Chân 16 | CS# — Chip select, active low |
| Chân 17 | BA0 — Bank address 0 |
| Chân 18 | BA1 — Bank address 1 |
| Chân 19 | A11 — Address bit 11 |
| Chân 20 | A10 — Address bit 10 / auto-precharge |
| Chân 21 | A0 — Address bit 0 |
| Chân 22 | A1 — Address bit 1 |
| Chân 23 | A2 — Address bit 2 |
| Chân 24 | A3 — Address bit 3 |
| Chân 25 | VDD — Power supply, 3.3V |
| Chân 26 | VSS — Ground |
| Chân 27 | A4 — Address bit 4 |
| Chân 28 | A5 — Address bit 5 |
| Chân 29 | A6 — Address bit 6 |
| Chân 30 | A7 — Address bit 7 |
| Chân 31 | A8 — Address bit 8 |
| Chân 32 | A9 — Address bit 9 |
| Chân 33 | NC — Not connected (per JEDEC 54-TSOP II standard) |
| Chân 34 | CKE — Clock enable, active high |
| Chân 35 | CLK — Clock input |
| Chân 36 | UDQM — Upper byte DQ mask enable |
| Chân 37 | VSSQ — DQ ground |
| Chân 38 | DQ15 — Data I/O, bit 15 |
| Chân 39 | DQ14 — Data I/O, bit 14 |
| Chân 40 | DQ13 — Data I/O, bit 13 |
| Chân 41 | DQ12 — Data I/O, bit 12 |
| Chân 42 | VDDQ — DQ power supply, 3.3V |
| Chân 43 | DQ11 — Data I/O, bit 11 |
| Chân 44 | DQ10 — Data I/O, bit 10 |
| Chân 45 | DQ9 — Data I/O, bit 9 |
| Chân 46 | DQ8 — Data I/O, bit 8 |
| Chân 47 | VSS — Ground |
| Chân 48 | NC — Not connected (per JEDEC 54-TSOP II standard) |
| Chân 49 | NC — Not connected (per JEDEC 54-TSOP II standard) |
| Chân 50 | NC — Not connected (per JEDEC 54-TSOP II standard) |
| Chân 51 | NC — Not connected (per JEDEC 54-TSOP II standard) |
| Chân 52 | NC — Not connected (per JEDEC 54-TSOP II standard) |
| Chân 53 | NC — Not connected (per JEDEC 54-TSOP II standard) |
| Chân 54 | VSS — Ground |
Ứng dụng tiêu biểu
MT48LC8M16A2P-75IT phù hợp cho 6 Áp dụngs: Legacy Industrial Controller Main Memory, Legacy Networking Line Card Buffer, Point-of-Sale Terminal Memory, Medical Instrumentation Data Buffer, Printer Engine Frame Buffer, Test and Measurement Instrument Memory.
Legacy Industrial Controller Main Memory
The MT48LC8M16A2P-75IT is ideal as the main working memory in legacy industrial controllers based on PowerPC, MIPS, or ARM7/ARM9 SoCs that natively support SDRAM. The 128Mbit density fits typical 16MB working memory requirements for HMI, PLC, and SCADA systems. Its 16-bit data bus and JEDEC-compliant interface allow direct connection to SoC external memory controllers without glue logic. The -40C to +85C industrial temperature grade handles factory-floor and outdoor cabinet installations, while the 7.5 ns tCK keeps the controller responsive for real-time deterministic control loops.
Được đề xuất
Legacy Networking Line Card Buffer
In legacy networking line cards, the MT48LC8M16A2P-75IT serves as a packet buffer or lookup-table memory, paired with network processors that expect 16-bit SDRAM. The 133 MHz bandwidth (266 MB/s peak) handles gigabit-rate packet queues comfortably, while the 54-TSOP II footprint allows dense PCB placement alongside PHY and switch ASICs. SDRAM's lower cost-per-bit versus SRAM makes it attractive for cost-sensitive access-equipment and DSLAM line cards, where latency tolerance is in the microsecond range. The IT temperature grade supports outdoor remote cabinets.
Được đề xuất
Point-of-Sale Terminal Memory
POS terminals and electronic cash registers rely on the MT48LC8M16A2P-75IT for transaction buffers, display frame memory, and printer-spool storage. The 8Mx16 organization supports both text-mode LCD frame buffers and transaction queue storage without bank switching. SDRAM's lower power consumption in self-refresh mode suits battery-backed POS terminals, while the 3.3 V single-supply operation simplifies power design in space-constrained enclosures. The industrial temperature range accommodates kitchen and outdoor POS deployments where commercial-grade parts would fail.
Được đề xuất
Medical Instrumentation Data Buffer
Ultrasound carts, patient monitors, and laboratory analyzers use the MT48LC8M16A2P-75IT as a waveform or sample-data buffer between the analog front end and the host processor. The 133 MHz burst rate enables continuous capture of digitized signal streams without dropping samples. The 16-bit data width matches the resolution of typical 12-16 bit ADC front ends, allowing direct data transfer without alignment logic. The IT temperature grade supports clinical environments with wide thermal cycling, and the SDRAM's well-characterized timing makes medical IEC 62304 firmware verification more straightforward.
Được đề xuất
Printer Engine Frame Buffer
Office printers and multifunction devices use the MT48LC8M16A2P-75IT as the page frame buffer for the print engine. At 300 DPI, an A4 page requires roughly 8MB of memory, exactly matching the MT48LC8M16A2P-75IT's 128Mbit capacity when configured as 8Mx16. The 133 MHz throughput supports single-pass duplex printing without buffer underruns. SDRAM's lower cost versus SRAM allows economical 600x600 DPI printers, while the 54-TSOP II package handles the high-temperature reflow of motor-driver-heavy printer PCBs.
Được đề xuất
Test and Measurement Instrument Memory
Bench oscilloscopes, logic analyzers, and arbitrary waveform generators use the MT48LC8M16A2P-75IT as deep-sample storage between the ADC and the display processor. The 133 MHz parallel interface allows direct connection to high-speed 8/16-bit ADCs without FIFO bridges. SDRAM's deterministic refresh and well-defined burst modes simplify acquisition-timing analysis. The 54-TSOP II footprint supports retrofits into existing instrument platforms that already have a 54-TSOP landing pattern, and the industrial temperature grade accommodates the elevated ambient inside instrument enclosures.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MT48LC8M16A2P-75IT — 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 | MT48LC8M16A2P-75IT:G | MT48LC8M16A2P-75IT:GTR | AS4C8M16SA-7TCN | IS42S81600F-7TL | W9825G6KH-6 |
|---|---|---|---|---|---|---|
| Brand | Micron Technology | Micron Technology | Micron Technology | Alliance Memory | ISSI | Winbond |
| Package | 54-pin TSOP II (0.400") | 54-pin TSOP II - same | 54-pin TSOP II - same | 54-pin TSOP II - same | 54-pin TSOP II - same | 54-pin TSOP II - same |
| Density | 128 Mbit | 128 Mbit | 128 Mbit | 128 Mbit | 128 Mbit | 64 Mbit (half density) |
| Organization | 8M x 16 | 8M x 16 | 8M x 16 | 8M x 16 | 8M x 16 | 4M x 16 (different density) |
| Clock Frequency | 133 MHz | 133 MHz | 133 MHz | 133 MHz | 133 MHz | 166 MHz (higher) |
| Supply Voltage | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V |
| Operating Temperature | -40C to +85C (IT grade) | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| RoHS Compliance | Non-RoHS (Pb-bearing) | RoHS compliant (Pb-free) | RoHS compliant (Pb-free) | RoHS compliant | RoHS compliant | RoHS compliant |
| Lifecycle Status | NRND | NRND | NRND | Active | Active | Active |
| Approx. Unit Price (1 qty) | $7.85 | $7.50 - $8.00 (DigiKey) | $7.50 - $8.00 (DigiKey) | $5.50 - $6.50 | $6.00 - $7.00 | $3.50 - $4.50 (lower density) |
Bảo phân biệt quan trọng
- Same-brand Pb-free alternative ensures long-term RoHS compliance (vsMT48LC8M16A2P-75IT:G)
- Alliance Memory provides active lifecycle alternative to NRND Micron part (vsAS4C8M16SA-7TCN)
- ISSI offers independent second-source with same JEDEC compliance (vsIS42S81600F-7TL)
Ghi chú thiết kế
Place 0.1 uF X7R capacitors within 5 mm of every VDD and VDDQ pin, and add 10 uF bulk capacitors near the package corners. SDRAM draws roughly 50-80 mA active and 1-2 mA in self-refresh; the bulk capacitors absorb the transient when entering/exiting self-refresh. Failing to decouple properly causes row/column-address errors and intermittent read failures at 133 MHz. Estimated: with 4 internal banks and burst reads, peak transient can reach 150 mA for 10 ns - the 10 uF bulk handles this without VDD droop below 3.0 V.
Route CLK, CKE, CS#, RAS#, CAS#, WE# as a matched bus with 50 ohm controlled impedance and length-matched within +/- 0.5 cm. Route DQ0-DQ15 in a byte group (DQ0-DQ7 separated from DQ8-DQ15) and length-match each byte group to within +/- 0.2 cm of CLK. Impedance mismatches cause reflection-induced setup/hold violations. Use a 4-layer PCB minimum with a continuous ground plane on layer 2 directly beneath the SDRAM; split or missing ground planes create EMI and signal-integrity problems.
The most common failure mode is incorrect mode-register programming during the initialization sequence. The datasheet specifies a strict power-on sequence: apply stable VDD/VDDQ, assert CKE high after 100 us, issue PRECHARGE ALL, then AUTO-REFRESH x 2 cycles, then LOAD MODE REGISTER. Skipping the AUTO-REFRESH cycles leaves the SDRAM in an undefined state, causing read data corruption. Also ensure LDQM and UDQM are pulled high (masking disabled) before the first read; leaving them low silently masks data and produces all-zero reads.
Estimated: at full 133 MHz continuous reads, the MT48LC8M16A2P-75IT dissipates around 200-300 mW. With 54-TSOP II theta_JA of approximately 60 C/W on a 4-layer PCB, the junction-to-ambient rise is 12-18 C. Industrial temperature grade (85C max) gives 70-85 C ambient headroom, sufficient for enclosed industrial cabinets without a heatsink. Forced-air cooling is not required.
Use series 33 ohm damping resistors on the CLK output of the host controller if the trace length exceeds 5 cm. SDRAM's edge rate (1-2 ns) creates ringing on under-terminated clocks, which the SDRAM interprets as multiple clock edges. Terminate DQM signals with 4.7 kohm pull-ups to VDDQ to prevent floating-state glitches during bus turnaround. Never let the address bus float; add 10 kohm pull-ups to A0-A11 if the host controller enters high-impedance during reset.
Thông tin tuân thủ
Original MT48LC8M16A2P-75IT is non-RoHS (lead-bearing finish). The :G variant (MT48LC8M16A2P-75IT:G) is RoHS compliant with lead-free matte-tin plating. AEC-Q100 not applicable for industrial-grade SDRAM.
