TMS4257-12FML
Nibble Mode DRAM, 256KX1, 120ns, NMOS, PQCC18Manufacturer: Texas Instruments
Categories: DRAMs
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Texas Instruments TMS4257-12FML is a 262,144-bit dynamic random-access memory (DRAM) component organized as 256K words by 1 bit. This NMOS technology device operates asynchronously with a maximum access time of 120 nanoseconds. It features Nibble Mode for faster data retrieval, supporting RAS Only, CAS Before RAS, and Hidden refresh cycles. The memory IC is housed in an 18-terminal PQCC (Plastic Quad Flat Chip Carrier) package with J-bend terminals for surface mounting. Its separate I/O configuration and 3-state output characteristics are suitable for applications in industrial control systems and consumer electronics requiring efficient memory management. The operating supply voltage ranges from 4.5V to 5.5V, with a nominal value of 5V.
Additional Information
Series: TMS4257RoHS Status: Manufacturer Lead Time: Product Status: DiscontinuedPackaging: Datasheet:Download Free CAD Model:
Technical Details:
| Length | 12.4460 |
| Width | 7.3660 |
| Technology | NMOS |
| Access_Mode | NIBBLE |
| Access_Time_Max | 120.0000000000000000 |
| Additional_Feature | RAS ONLY/CAS BEFORE RAS/HIDDEN REFRESH |
| I_O_Type | SEPARATE |
| JESD_30_Code | R-PQCC-J18 |
| Memory_Density | 262144.0000000000000000 |
| Memory_IC_Type | NIBBLE MODE DRAM |
| Memory_Organization | 256KX1 |
| Memory_Width | 1 |
| Number_of_Functions | 1 |
| Number_of_Ports | 1 |
| Number_of_Terminals | 18 |
| Number_of_Words | 262144.0000000000000000 |
| Number_of_Words_Code | 256k |
| Operating_Mode | Asynchronous |
| Operating_Temperature_Max | 70.0 |
| Operating_Temperature_Min | 0.0 |
| Output_Characteristics | 3-State |
| Package_Body_Material | PLASTIC/EPOXY |
| Package_Code | QCCJ |
| Package_Equivalence_Code | LDCC18,.33X.53 |
| Package_Shape | Rectangular |
| Package_Style | CHIP CARRIER |
| Refresh_Cycles | 256 |
| Seated_Height_Max | 3.5300 |
| Supply_Voltage_Max | 5.50000 |
| Supply_Voltage_Min | 4.50000 |
| Supply_Voltage_Nom | 5 |
| Surface_Mount | Yes |
| Terminal_Form | J BEND |
| Terminal_Pitch | 1.270 |
| Terminal_Position | QUAD |
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