參數(shù)資料
型號： MCM44A256B
廠商： Motorola, Inc.
英文描述： FILTER SAW 479.5MHZ
中文描述： 二級緩存4MB的R4000的快速靜態(tài)存儲器模塊集
文件頁數(shù)： 1/8頁
文件大?。?/td> 81K
代理商： MCM44A256B
MCM44256B SERIES
1
MOTOROLA FAST SRAM
Motorola, Inc. 1997
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 se-
ries 25
resistors.
The MCM6729DWJ and MCM6726DWJ are fabricated using high–perfor-
mance 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
PIN NAMES
A0 – A17
WE
. . . . . . . . . . . . . . . . . . . . . . .
DCS
. . . . . . . . . . . . . . . . . . . . . .
TCS
. . . . . . . . . . . . . . . . . . . . . . .
OE
. . . . . . . . . . . . . . . . . . . . .
DQ0 – DQ35
. . . . . . . . .
TDQ0 – TDQ7
. . .
VCC
. . . . . . . . . . . . . . . .
VSS
. . . . . . . . . . . . . . . . . . . . . . . . . .
Address Inputs
Write Enable
Data Enable
Tag Enable
Output Enable
Data Input / Output
TAG Data Input / Output
+ 5 V Power Supply
. . . . . . . . . . . . . . . .
Ground
For proper operation of the device, VSS must
be connected to ground.
Order this document
by MCM44256B/D
SEMICONDUCTOR TECHNICAL DATA
PIN ASSIGNMENT
80 LEAD SIMM — TOP VIEW
MCM44256B
Series
2
4
6
DQ5
VSS
DQ8
DQ10
DQ12
DQ14
DQ15
DQ17
DQ19
DQ21
VSS
DQ23
DQ25
DQ27
DQ29
VSS
DQ0
DQ2
DQ4
DQ6
DQ9
DQ11
DQ13
VSS
DQ16
DQ18
DQ20
DQ22
VCC
DQ24
DQ28
DQ7
19
21
23
25
27
29
1
3
5
7
9
11
13
15
17
20
22
24
26
28
30
32
8
10
12
14
16
18
31
DQ3
33
35
37
39
34
36
38
40
DQ31
VSS
DQ26
DQ34
VSS
42
44
A0
A2
A4
A6
VCC
OE
A8
A10
VSS
A13
A15
A17
TDQ0
TDQ1
TDQ3
DQ33
DQ35
WE
A1
A3
VSS
DCS
A7
A9
A11
A12
A14
A16
TCS
TDQ4
A5
59
61
63
65
67
69
41
43
45
47
49
51
53
55
57
60
62
64
66
68
70
72
74
46
48
50
52
54
56
58
71
73
75
77
76
78
80
79
VCC
TDQ6
TDQ2
VSS
DQ30
DQ32
DQ1
TDQ5
TDQ7
VSS
VCC
11/19/97
相關(guān)PDF資料
PDF描述
MCM44256B 4MB R4000 Secondary Cache Fast Static RAM Module Set
MCM44D256B 4MB R4000 Secondary Cache Fast Static RAM Module Set
MCM44B256B OSC 5V SMT 7X5 CMOS PROGRM
MCM56824AFN20 Circular Connector; No. of Contacts:11; Series:MS27467; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:19; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:19-11 RoHS Compliant: No
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MCM44A64 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:1MB R4000 Secondary Cache Fast Static RAM Module Set
MCM44B256B 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:4MB R4000 Secondary Cache Fast Static RAM Module Set
MCM44B64 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:1MB R4000 Secondary Cache Fast Static RAM Module Set
MCM44C256B 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:4MB R4000 Secondary Cache Fast Static RAM Module Set
MCM44C64 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:1MB R4000 Secondary Cache Fast Static RAM Module Set
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