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MCM44A256B

Motorola
Part Number MCM44A256B
Manufacturer Motorola
Description 4MB R4000 Secondary Cache Fast Static RAM Module Set
Published Apr 30, 2005
Detailed Description MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MCM44256B/D 4MB R4000 Secondary Cache Fast Static RAM Mo...
Datasheet PDF File MCM44A256B PDF File

MCM44A256B
MCM44A256B

Overview
MOTOROLA SEMICONDUCTOR TECHNICAL DATA Order this document by MCM44256B/D 4MB R4000 Secondary Cache Fast Static RAM Module Set Four MCM44256B modules comprise a full 4 MB of secondary cache for the R4000 processor.
Each module contains nine MCM6729DWJ fast static RAMs for a cache data size of 256K x 36.
The tag portion, dependent on word line size, contains either two MCM6729DWJ or one MCM6726DWJ fast static RAMs.
All input signals, except A0 and WE are buffered using 74FBT2827 drivers with series 25 Ω resistors.
The MCM6729DWJ and MCM6726DWJ are fabricated using high–performance silicon–gate BiCMOS technology.
Static design eliminates the need for internal clocks or timing strobes.
All 4MB R4000 supported secondary cache options are available.
• • • • • • Single 5 V ± 10% Power Supply All Inputs and Outputs are TTL Compatible Fast Module Access Time: 12/15/17 ns Zero Wait–State Operation Unified or Split Secondary Cache is Supported Word Line Sizes of 4, 8, 16, and 32 are Available (See Ordering Information for Details) • Decoupling Capacitors are Used for Each Fast Static RAM and Buffer, Along with Bulk Capacitance for Maximum Noise Immunity • High Quality Multi–Layer FR4 PWB with Separate Power and Ground Planes MCM44256B Series PIN ASSIGNMENT 80 LEAD SIMM — TOP VIEW VCC DQ1 DQ3 DQ5 VSS DQ8 DQ10 DQ12 DQ14 DQ15 DQ17 DQ19 DQ21 VSS DQ23 DQ25 DQ27 DQ29 DQ30 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70 72 74 76 78 80 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 53 55 57 59 61 63 65 67 69 71 73 75 77 79 VSS DQ0 DQ2 DQ4 DQ6 DQ7 DQ9 DQ11 DQ13 VSS DQ16 DQ18 DQ20 DQ22 VCC DQ24 DQ26 DQ28 VSS DQ31 DQ33 DQ35 WE A1 A3 A5 VSS DCS A7 A9 A11 A12 A14 A16 TCS VSS TDQ2 TDQ4 TDQ6 VCC PIN NAMES A0 – A17 .
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Address Inputs WE .
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Write Enable DCS .
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Data Enable TCS .
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