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MCM44256B Datasheet(PDF) 1 Page - Motorola, Inc

Part No. MCM44256B
Description  4MB R4000 Secondary Cache Fast Static RAM Module Set
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Manufacturer  MOTOROLA [Motorola, Inc]
Direct Link  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

MCM44256B Datasheet(HTML) 1 Page - Motorola, Inc

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MCM44256B SERIES
1
MOTOROLA FAST SRAM
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
Ω 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
Address Inputs
. . . . . . . . . . . . . . . .
WE
Write Enable
. . . . . . . . . . . . . . . . . . . . . . .
DCS
Data Enable
. . . . . . . . . . . . . . . . . . . . . .
TCS
Tag Enable
. . . . . . . . . . . . . . . . . . . . . . .
OE
Output Enable
. . . . . . . . . . . . . . . . . . . . .
DQ0 – DQ35
Data Input / Output
. . . . . . . . .
TDQ0 – TDQ7
TAG Data Input / Output
. . .
VCC
+ 5 V Power Supply
. . . . . . . . . . . . . . . .
VSS
Ground
. . . . . . . . . . . . . . . . . . . . . . . . . .
For proper operation of the device, VSS must
be connected to ground.
Order this document
by MCM44256B/D
MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
PIN ASSIGNMENT
80 LEAD SIMM — TOP VIEW
MCM44256B
Series
2
DQ5
VSS
DQ8
DQ10
DQ12
DQ14
DQ15
DQ17
DQ19
DQ21
VSS
DQ23
DQ25
DQ27
VSS
DQ0
DQ2
DQ4
DQ6
DQ9
DQ11
DQ13
VSS
DQ16
DQ18
DQ20
DQ22
VCC
DQ28
DQ7
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
31
DQ3
33
35
37
34
36
38
40
39
DQ31
VSS
DQ26
DQ24
DQ34
42
A0
A2
A4
A6
VCC
OE
A8
A10
VSS
A13
A15
A17
TDQ0
TDQ1
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
44
46
48
50
52
54
56
58
71
VSS
73
75
77
74
76
78
80
79
VCC
TDQ6
TDQ2
VSS
DQ29
DQ30
DQ32
DQ1
TDQ3
TDQ5
TDQ7
VSS
VCC
11/19/97
© Motorola, Inc. 1997


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