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MCM32257BZ20 Datasheet(PDF) 1 Page - Motorola, Inc |
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MCM32257BZ20 Datasheet(HTML) 1 Page - Motorola, Inc |
1 / 8 page MCM32257B 6–1 MOTOROLA FAST SRAM 256K x 32 Bit Fast Static RAM Module The MCM32257B is an 8M bit static random access memory module orga- nized as 262,144 words of 32 bits. The module is a 64–lead zig–zag in–line pack- age (ZIP) of eight MCM6229 fast static RAMs packaged in 28–lead SOJ packages and mounted on a printed circuit board along with eight decoupling ca- pacitors. The MCM6229 is a high–performance CMOS fast static RAM organized as 262,144 words of 4 bits, fabricated using high–performance silicon–gate CMOS technology. Static design eliminates the need for external clocks or timing strobes, while CMOS circuitry reduces power consumption and provides for greater reliability. The MCM32257B is equipped with output enable (G) and four separate byte enable (E1 – E4) inputs, allowing for greater system flexibility. The G input, when high, will force the outputs to high impedance. Ex high will do the same for byte x. PD0 and PD1 are reserved for density identification. PD0 and PD1 are con- nected to ground. These pins can be used to identify the density of the memory module. • Single 5 V ± 10% Power Supply • Fast Access Time: 15/20/25 ns • Three–State Outputs • Fully TTL Compatible • JEDEC Standard Pinout • Power Requirement: 960/880/840 mA Maximum, Active AC • High Board Density ZIP Package • Byte Operation: Four Separate Chip Enables, One for Each Byte (Eight Bits) • High Quality Four–Layer FR4 PWB with Separate Internal Power and Ground Planes • Incorporates Motorola’s State–of–the–Art Fast Static RAMs A0 – A17 Address Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . W Write Enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . G Output Enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E1 – E4 Byte Enables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . DQ0 – DQ31 Data Input/Output . . . . . . . . . . . . . . . . . . . . . . VCC + 5 V Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . VSS Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . PD0 – PD1 Package Density . . . . . . . . . . . . . . . . . . . . . . . . For proper operation of the device, VSS must be connected to ground. PIN NAMES Order this document by MCM32257B/D MOTOROLA SEMICONDUCTOR TECHNICAL DATA MCM32257B PD0 2 A15 52 DQ1 DQ2 DQ3 VCC A1 A3 A5 DQ4 DQ5 DQ6 DQ7 W A7 E1 VSS PD1 DQ8 DQ9 DQ10 A0 A2 A4 DQ12 DQ13 DQ14 DQ15 VSS A6 E2 DQ11 E4 A8 DQ24 A10 A12 A14 G DQ25 DQ27 E3 A9 VSS DQ16 DQ17 DQ18 DQ19 A11 A13 43 DQ26 19 21 23 25 27 29 1 3 5 7 9 11 13 15 17 20 22 24 26 28 30 32 4 6 8 10 12 14 16 18 45 47 49 51 31 33 35 37 39 41 46 48 50 34 36 38 40 42 44 A16 DQ20 DQ21 DQ22 DQ23 VSS 62 64 54 56 58 60 61 63 53 55 57 59 VCC DQ28 A17 DQ29 DQ31 DQ30 PIN ASSIGNMENT TOP VIEW 64 LEAD ZIP — CASE 871–01 DQ0 5/95 © Motorola, Inc. 1995 |
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