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Texas Instruments TMS44100-80DJ
- Part No.:
- TMS44100-80DJ
- Manufacturer:
- Texas Instruments
- Category:
- Controllers
- Package:
- -
- Datasheet:
-
TMS44100-80DJ.pdf
- Description:
- FAST PAGE DRAM, 4MX1, 80NS
- Quantity:
- Payment:
- Shipping:
Inventory:15,670
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Product details
Overview
TMS44100-80DJ from Texas Instruments is a 4,194,304-word × 1-bit dynamic RAM (DRAM) in a 26-pin SOJ package, operating from a single 5-V ±10% supply, with 80 ns RAS access time (tRAC), 20 ns CAS access time (tCAC), and 150 ns random cycle time (tRC). It supports enhanced page-mode operation and CBR refresh for embedded memory subsystems in legacy industrial controllers and video frame buffers.
For engineers reviewing the TMS44100-80DJ datasheet, TMS44100-80DJ pinout, TMS44100-80DJ application, or TMS44100-80DJ equivalent, key selection criteria include its 5-V-only operation, non-self-refresh architecture, 26-pin SOJ (DJ) footprint, 0°C to 70°C temperature range, and compatibility with standard DRAM controllers requiring 11 address lines (A0–A10) and RAS/CAS/W strobes.
Technical Context
This DRAM uses Texas Instruments' EPIC™ CMOS process and implements multiplexed address inputs (A0–A10), latched row/column addressing via RAS and CAS, and 3-state unlatched output (Q). It requires external generation of all 1024 row addresses for standard 16-ms refresh.
It supports enhanced page mode-where column addresses are latched on CAS falling edge while RAS remains low-and CBR refresh, but lacks self-refresh capability (unlike TMS44100P variants). Write enable (W) controls read/write mode with TTL-compatible input thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 4,194,304 × 1-bit (4 Mbit total) |
| Supply Voltage | 5 V ±10% - requires stable 4.5–5.5 V rail; not compatible with 3.3 V systems |
| RAS Access Time (tRAC) | 80 ns - defines minimum latency from RAS assertion to valid data out in random access |
| CAS Access Time (tCAC) | 20 ns - determines fastest data retrieval after CAS assertion in page or burst reads |
| Random Cycle Time (tRC) | 150 ns - sets minimum interval between successive read/write operations |
| Refresh Requirement | 1024-row refresh every 16 ms - mandates external refresh controller or CPU-driven RAS-only cycles |
| Operating Temperature | 0°C to 70°C - qualified for commercial/industrial ambient environments, not extended temp |
Pinout & Package
Package: 26-pin plastic surface-mount SOJ (300-mil width), suffix DJ, rated for 0°C to 70°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VSS | Ground | Primary reference for all I/O and internal logic; must be low-impedance connection |
| Q | Data Output | Unlatched, 3-state output; driven only when CAS is low; high-impedance otherwise |
| CAS | Column-Address Strobe | Latches column address (A0–A10) on falling edge; enables output buffer during read |
| NC | No Connection | Pin 4 and Pin 13 are unconnected; must remain floating or tied to ground per layout best practice |
| A9, A8, A7, A6, A5, A4 | Address Inputs | Shared row/column address lines; multiplexed via RAS/CAS timing; require setup/hold stability |
| D | Data Input | Driven during write cycles; disabled (high-Z) when W = high (read mode) |
| W | Write Enable | Active-low control: W = low → write; W = high → read; TTL-compatible threshold (VIH ≥ 2.4 V) |
| RAS | Row-Address Strobe | Latches row address (A0–A10); activates sense amplifiers and row decoder on falling edge |
| NC | No Connection | Pin 12 is unconnected; no internal bond; leave unpopulated or grounded |
| A10, A0, A1, A2, A3 | Address Inputs | Complete 11-bit address bus; all must be stable before RAS/CAS falling edges per timing specs |
| VCC | Power Supply | 5-V supply input; bypassing with 0.1 µF ceramic capacitor near pin required for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Enhanced Page-Mode Operation | Enables faster sequential column access by eliminating row-address re-latching; reduces effective tAA to tCAC (20 ns) within same row |
| CAS-Before-RAS (CBR) Refresh | Allows hidden refresh without halting normal memory access; uses internal counter, no external address needed during CBR |
| 11-Bit Multiplexed Address Bus | Reduces pin count to 11 address lines (A0–A10) shared for row/column; simplifies PCB routing vs. non-multiplexed DRAMs |
| 3-State Unlatched Output (Q) | Provides system-level flexibility: output floats when CAS high, enabling bus sharing without external tri-state logic |
| EPIC™ CMOS Process | Delivers high-speed performance (80 ns tRAC) with low power consumption (ICC2 = 1 mA standby) at 5 V |
Applications
| Industrial PLC Memory Expansion | Legacy Video Frame Buffer |
|---|---|
Use Scenario: Adding external frame storage to analog video capture boards in factory-floor vision inspection systems. IC Role / Device Role / Timing Role: Stores one-bit-per-pixel monochrome image data; interfaces directly to video shift register and DMA controller using RAS/CAS/W handshaking. Use Value: 80 ns tRAC and 20 ns tCAC support real-time 60 Hz NTSC line buffering; 16-ms refresh aligns with standard video vertical blanking intervals. |
Use Scenario: Expanding display memory in early-generation medical ultrasound console displays. IC Role / Device Role / Timing Role: Acts as pixel map storage for grayscale raster rendering; driven by dedicated graphics controller with fixed 11-bit address bus. Use Value: Enhanced page mode enables rapid horizontal scan-line writes; SOJ package allows dense memory array layout on space-constrained PCBs. |
| Telecom Line Card Buffer | Test Equipment Data Log |
Use Scenario: Temporary packet payload storage in T1/E1 framer modules for protocol analysis. IC Role / Device Role / Timing Role: Buffers incoming serial bitstreams converted to parallel format; refreshed via CPU-initiated RAS-only cycles during idle frames. Use Value: 150 ns tRC supports full-duplex 2.048 Mbps data logging; 5-V tolerance matches legacy telecom power rails. |
Use Scenario: Capturing sensor waveform snapshots in benchtop oscilloscope auxiliary memory. IC Role / Device Role / Timing Role: Stores digitized analog samples under microcontroller control; accessed in burst mode during trigger events. Use Value: Unlatched Q output simplifies glue logic with FPGA-based acquisition engines; 0°C–70°C rating ensures reliability across lab environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MT4C1024Z-80L | 5-V, 1-Mbit × 4 organization; 80 ns tRAC; 28-pin SOJ; no CBR refresh; requires 4× fewer address cycles | Higher density per chip but wider data bus; incompatible with 1-bit-wide systems | Select only if redesigning data path to 4-bit interface and accepting higher refresh overhead |
| TMS44100-80DGA | Same electrical specs and timing; 26-pin TSOP package instead of SOJ; identical pinout mapping except physical layout | Requires PCB footprint change; better thermal dissipation but less robust mechanical retention | Choose for automated assembly or improved thermal performance where SOJ solder joint reliability is a concern |
Compared with MT4C1024Z-80L and TMS44100-80DGA, the TMS44100-80DJ offers direct drop-in compatibility in legacy 26-pin SOJ sockets, preserves 1-bit bus architecture, and retains CBR refresh support-critical for systems where CPU bandwidth is constrained and hidden refresh is mandatory.
Availability
TMS44100-80DJ is available at Aetrix Electronics and suitable for industrial PLC memory expansion, legacy video frame buffering, and telecom line card applications requiring stable component supply and long-term obsolescence management.
Supply support for TMS44100-80DJ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a U.S.-based semiconductor innovator founded in 1930, specializing in analog, embedded processing, and memory solutions for industrial, automotive, and communications markets.
The TMS4x100 series was designed specifically for cost-sensitive, high-reliability 5-V DRAM applications in 1990s-era industrial and video electronics, emphasizing pin efficiency, low-power standby, and CBR refresh compatibility.
FAQ
What is the maximum operating frequency supported by the TMS44100-80DJ?
The TMS44100-80DJ does not specify a clock frequency; it is an asynchronous DRAM. Its speed is defined by timing parameters: minimum random cycle time (tRC) is 150 ns, supporting up to ~6.7 MHz effective throughput in worst-case random access. Page-mode operation improves bandwidth by reducing tAA to tCAC (20 ns), enabling faster sequential reads.
Does the TMS44100-80DJ support self-refresh mode?
No, the TMS44100-80DJ does not support self-refresh. Self-refresh is exclusive to the 'P' variants (e.g., TMS44100P-80DJ), which integrate an on-chip oscillator and CBR counter. The TMS44100-80DJ requires externally generated refresh cycles every 16 ms using RAS-only or CBR methods.
Can the TMS44100-80DJ be used with a 3.3-V system?
No. The TMS44100-80DJ is specified only for 5-V ±10% operation (4.5–5.5 V). Its input thresholds (VIH ≥ 2.4 V, VIL ≤ 0.8 V) and absolute maximum ratings (–1 V to 7 V) are TTL/5-V CMOS compatible. For 3.3-V systems, use the pin-compatible TMS46100-80DJ variant.
What is the function of the NC pins on the TMS44100-80DJ SOJ package?
The TMS44100-80DJ has two NC (No Connection) pins: Pin 4 and Pin 13. These pins have no internal connection and must remain unconnected. Best practice is to leave them floating or tie them to ground on the PCB to minimize noise coupling-never connect to VCC or active signals.
How many address lines does the TMS44100-80DJ require, and how are they used?
The TMS44100-80DJ uses 11 multiplexed address lines (A0–A10). During a memory cycle, the full 11-bit address is presented twice: first latched by RAS (row portion), then latched by CAS (column portion). This reduces pin count versus non-multiplexed DRAMs and requires precise RAS/CAS timing alignment per the datasheet.
TMS44100-80DJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Controller Type:
- -
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
TMS44100-80DJ FAQ
1.How can I place an order for TMS44100-80DJ through Aetrix?
Please submit a Request for Quotation (RFQ) for TMS44100-80DJ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TMS44100-80DJ reliable?
The price and inventory of TMS44100-80DJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TMS44100-80DJ is usually 5 days.
3.What payment methods are accepted for TMS44100-80DJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TMS44100-80DJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TMS44100-80DJ?
TMS44100-80DJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TMS44100-80DJ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TMS44100-80DJ?
For technical support, including TMS44100-80DJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TMS44100-80DJ requirements.
6.How does Aetrix verify that TMS44100-80DJ is sourced from the original manufacturer or authorized distributors?
All TMS44100-80DJ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TMS44100-80DJ meets industry standards.
7.What is the process for return or replacement of TMS44100-80DJ?
All TMS44100-80DJ units undergo pre-shipment inspection (PSI). If there is an issue with TMS44100-80DJ, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TMS44100-80DJ part is unused and in its original packaging.
Return procedure for TMS44100-80DJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TMS44100-80DJ Tags
-
BQ2201SN-N
Texas Instruments
-
DS1314S+
Analog Devices Inc./Maxim Integrated
-
BQ2205LYPW
Texas Instruments
-
MXD1210CSA+
Analog Devices Inc./Maxim Integrated
-
MXD1210CPA+
Analog Devices Inc./Maxim Integrated
-
4RCD0232KC1ATG
Renesas
-
DS1312S-2+
Analog Devices Inc./Maxim Integrated
-
DS1314S-2+T&R
Analog Devices Inc./Maxim Integrated
-
DS1321S+
Analog Devices Inc./Maxim Integrated
-
DS1312S+
Analog Devices Inc./Maxim Integrated
-
MXD1210ESA+
Analog Devices Inc./Maxim Integrated
-
DS1321E+
Analog Devices Inc./Maxim Integrated
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