NEC MC-458CB641PS 8m-word by 64-bit synchronous dynamic ram module so dimm Datasheet

DATA SHEET
MOS INTEGRATED CIRCUIT
MC-458CB641ES, 458CB641PS
8M-WORD BY 64-BIT
SYNCHRONOUS DYNAMIC RAM MODULE (SO DIMM)
Description
The MC-458CB641ES and MC-458CB641PS are 8,388,608 words by 64 bits synchronous dynamic RAM module
(Small Outline DIMM) on which 4 pieces of 128M SDRAM: µPD45128163 are assembled.
These modules provide high density and large quantities of memory in a small space without utilizing the surfacemounting technology on the printed circuit board.
Decoupling capacitors are mounted on power supply line for noise reduction.
Features
• 8,388,608 words by 64 bits organization
• Clock frequency and access time from CLK
Part number
/CAS latency
Clock frequency (MAX.)
Access time from CLK (MAX.)
CL = 3
125 MHz
6 ns
CL = 2
100 MHz
6 ns
CL = 3
100 MHz
6 ns
CL = 2
77 MHz
7 ns
CL = 3
125 MHz
6 ns
CL = 2
100 MHz
6 ns
CL = 3
100 MHz
6 ns
CL = 2
77 MHz
7 ns
MC-458CB641ES-A80
MC-458CB641ES-A10
★
★
MC-458CB641PS-A80
MC-458CB641PS-A10
• Fully Synchronous Dynamic RAM, with all signals referenced to a positive clock edge
• Pulsed interface
• Possible to assert random column address in every cycle
• Quad internal banks controlled by BA0, BA1 (Bank Select)
• Programmable burst-length: 1, 2, 4, 8 and Full Page
• Programmable wrap sequence (Sequential / Interleave)
• Programmable /CAS latency (2, 3)
• Automatic precharge and controlled precharge
• CBR (Auto) refresh and self refresh
• Single 3.3 V ±0.3 V power supply
• LVTTL compatible
• 4,096 refresh cycles/64 ms
• Burst termination by Burst Stop command and Precharge command
• 144-pin small outline dual in-line memory module (Pin pitch = 0.8 mm)
• Unbuffered type
• Serial PD
The information in this document is subject to change without notice. Before using this document, please
confirm that this is the latest version.
Not all devices/types available in every country. Please check with local NEC representative for
availability and additional information.
Document No. M14015EJ4V0DS00 (4th edition)
Date Published February 2000 NS CP(K)
Printed in Japan
The mark • shows major revised points.
©
1999
MC-458CB641ES, 458CB641PS
Ordering Information
Part number
Clock frequency
Package
Mounted devices
MHz (MAX.)
MC-458CB641ES-A80
125 MHz
MC-458CB641ES-A10
100 MHz
MC-458CB641PS-A80
125 MHz
144-pin Small Outline DIMM
4 pieces of µPD45128163G5 (Rev. E)
(Socket Type)
(10.16mm (400) TSOP (II))
Edge connector: Gold plated
25.4 mm height
★
4 pieces of µPD45128163G5 (Rev. P)
(10.16mm (400) TSOP (II))
★
MC-458CB641PS-A10
2
100 MHz
Data Sheet M14015EJ4V0DS00
MC-458CB641ES, 458CB641PS
Pin Configuration
144-pin Dual In-line Memory Module Socket Type (Edge connector: Gold plated)
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
82
84
86
88
90
92
94
96
98
100
102
104
106
108
110
112
114
116
118
120
122
124
126
128
130
132
134
136
138
140
142
144
Vss
DQ 32
DQ 33
DQ 34
DQ 35
Vcc
DQ 36
DQ 37
DQ 38
DQ 39
Vss
DQMB4
DQMB5
Vcc
A3
A4
A5
Vss
DQ 40
DQ 41
DQ 42
DQ 43
Vcc
DQ 44
DQ 45
DQ 46
DQ 47
Vss
NC
NC
Vss
DQ 0
DQ 1
DQ 2
DQ 3
VCC
DQ 4
DQ 5
DQ 6
DQ 7
Vss
DQMB0
DQMB1
VCC
A0
A1
A2
Vss
DQ 8
DQ 9
DQ 10
DQ 11
VCC
DQ 12
DQ 13
DQ 14
DQ 15
Vss
NC
NC
CLK0
CKE0
Vcc
Vcc
/RAS
/CAS
/WE
NC
/CS0
NC
NC
NC
NC
CLK1
Vss
Vss
NC
NC
NC
NC
VCC
Vcc
DQ 16
DQ 48
DQ 17
DQ 49
DQ 18
DQ 50
DQ 19
DQ 51
Vss
Vss
DQ 20
DQ 52
DQ 21
DQ 53
DQ 22
DQ 54
DQ 23
DQ 55
Vcc
Vcc
A6
A7
A8
BA0 (A13)
Vss
Vss
A9
BA1 (A12)
A10
A11
Vcc
Vcc
DQMB2
DQMB6
DQMB3
DQMB7
Vss
Vss
DQ 24
DQ 56
DQ 25
DQ 57
DQ 26
DQ 58
DQ 27
DQ 59
VCC
Vcc
DQ 28
DQ 60
DQ 61
DQ 29
DQ 62
DQ 30
DQ 63
DQ 31
Vss
Vss
SCL
SDA
VCC
Vcc
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
81
83
85
87
89
91
93
95
97
99
101
103
105
107
109
111
113
115
117
119
121
123
125
127
129
131
133
135
137
139
141
143
Data Sheet M14015EJ4V0DS00
/xxx indicates active low signal.
A0 - A11
: Address Inputs
[Row: A0 - A11, Column: A0 - A8]
BA0(A13),BA1(A12) : SDRAM Bank Select
DQ0 - DQ63
: Data Inputs/Outputs
CLK0, CLK1
: Clock Input
CKE0
: Clock Enable Input
/CS0
: Chip Select Input
/RAS
: Row Address Strobe
/CAS
: Column Address Strobe
/WE
: Write Enable
DQMB0 - DQMB7 : DQ Mask Enable
SDA
: Serial Data I/O for PD
SCL
: Clock Input for PD
VCC
: Power Supply
VSS
: Ground
NC
: No Connection
3
MC-458CB641ES, 458CB641PS
Block Diagram
/WE
/CS0
LDQM
DQMB0
DQ 0
/CS
/WE
LDQM
DQ 0
DQMB4
DQ 32
DQ 0
DQ 1
DQ 1
DQ 33
DQ 1
DQ 2
DQ 2
DQ 34
DQ 2
DQ 3
DQ 3
DQ 35
DQ 3
DQ 4
DQ 4
DQ 36
DQ 4
DQ 5
DQ 5
DQ 37
DQ 5
DQ 6
DQ 6
DQ 38
DQ 6
DQ 7
DQ 7
DQ 39
DQ 7
UDQM
D0
UDQM
DQMB1
DQ 8
DQ 15
DQMB5
DQ 40
DQ 9
DQ 14
DQ 41
DQ 14
DQ 10
DQ 13
DQ 42
DQ 13
DQ 11
DQ 12
DQ 43
DQ 12
DQ 12
DQ 11
DQ 44
DQ 11
DQ 13
DQ 10
DQ 45
DQ 10
DQ 14
DQ 9
DQ 46
DQ 9
DQ 15
DQ 8
DQ 47
DQ 8
DQMB2
DQ 16
DQ 17
LDQM
/CS
/WE
LDQM
DQ 7
DQ 7
DQ 6
DQ 49
DQ 6
DQ 18
DQ 5
DQ 50
DQ 5
DQ 19
DQ 4
DQ 51
DQ 4
DQ 20
DQ 3
DQ 52
DQ 3
DQ 21
DQ 2
DQ 53
DQ 2
DQ 22
DQ 1
DQ 54
DQ 1
DQ 23
DQ 0
DQ 55
DQ 0
UDQM
DQMB3
/WE
/CS
D3
UDQM
DQ 24
DQ 8
DQMB7
DQ 56
DQ 25
DQ 9
DQ 57
DQ 9
DQ 26
DQ 10
DQ 58
DQ 10
DQ 27
DQ 11
DQ 59
DQ 11
DQ 28
DQ 12
DQ 60
DQ 12
DQ 29
DQ 13
DQ 61
DQ 13
DQ 30
DQ 14
DQ 62
DQ 14
DQ 31
DQ 15
DQ 63
DQ 15
SERIAL PD
D2
DQ 15
DQMB6
DQ 48
D1
/WE
/CS
DQ 8
VCC
D0 - D3
C
SCL
VSS
SDA
A0
A1
10 Ω
CLK0
A0 - A11
A0 - A11 : D0 - D3
BA0
A13 : D0 - D3
BA1
A12 : D0 - D3
CLK : D0 - D3
CLK1
10 pF
/RAS
/RAS : D0 - D3
/CAS
/CAS : D0 - D3
CKE0
CKE : D0 - D3
Remarks 1. D0 - D3: µPD45128163 (2M words x 16 bits x 4 banks)
2. The value of all resistors is 10 Ω.
4
D0 - D3
A2
Data Sheet M14015EJ4V0DS00
MC-458CB641ES, 458CB641PS
Electrical Specifications
• All voltages are referenced to VSS (GND).
• After power up, wait more than 100 µs and then, execute power on sequence and CBR (Auto) refresh before proper
device operation is achieved.
Absolute Maximum Ratings
Parameter
Symbol
Condition
Rating
Unit
Voltage on power supply pin relative to GND
VCC
–0.5 to +4.6
V
Voltage on input pin relative to GND
VT
–0.5 to +4.6
V
Short circuit output current
IO
50
mA
Power dissipation
PD
4
W
Operating ambient temperature
TA
0 to +70
°C
Storage temperature
Tstg
–55 to +125
°C
Caution
Exposing the device to stress above those listed in Absolute Maximum Ratings could cause
permanent damage. The device is not meant to be operated under conditions outside the limits
described in the operational section of this specification. Exposure to Absolute Maximum Rating
conditions for extended periods may affect device reliability.
Recommended Operating Conditions
Parameter
Symbol
Condition
MIN.
TYP.
MAX.
Unit
3.3
3.6
V
V
Supply voltage
VCC
3.0
High level input voltage
VIH
2.0
VCC + 0.3
Low level input voltage
VIL
–0.3
+ 0.8
V
Operating ambient temperature
TA
0
70
°C
MAX.
Unit
pF
Capacitance (TA = 25 °C, f = 1 MHz)
Parameter
Input capacitance
Data input/output capacitance
Symbol
Test condition
MIN.
CI1
A0 - A11, BA0(A13), BA1(A12),
/RAS, /CAS, /WE
15
30
CI2
CLK0
23
37
CI3
CKE0
15
26
CI4
/CS0
15
26
CI5
DQMB0 - DQMB7
5
10
CI/O
DQ0 - DQ63
5
12
Data Sheet M14015EJ4V0DS00
TYP.
pF
5
MC-458CB641ES, 458CB641PS
DC Characteristics (Recommended Operating Conditions unless otherwise noted)
Parameter
Operating current
Symbol
ICC1
Test condition
Burst length = 1, tRC ≥ tRC(MIN.)
MIN.
/CAS latency = 2
/CAS latency = 3
Precharge standby current in
★
power down mode
Precharge standby current in
ICC2P
ICC2PS
ICC2N
ICC2NS
power down mode
Active standby current in
ICC3P
ICC3PS
ICC3N
ICC3NS
-A80
440
-A10
440
CKE ≤ VIL(MAX.), tCK = ∞
4
CKE ≥ VIH(MIN.), tCK = 15 ns, /CS ≥ VIH(MIN.),
80
CKE ≥ VIH(MIN.), tCK = ∞, Input signals are stable.
32
CKE ≤ VIL(MAX.), tCK = 15 ns
20
CKE ≤ VIL(MAX.), tCK = ∞
16
CKE ≥ VIH(MIN.), tCK = 15 ns, /CS ≥ VIH(MIN.),
120
ICC4
CKE ≥ VIH(MIN.), tCK = ∞, Input signals are stable.
tCK ≥ tCK(MIN.), IO = 0 mA
/CAS latency = 2
ICC5
tRC ≥ tRC(MIN.)
/CAS latency = 2
/CAS latency = 3
★
440
4
/CAS latency = 3
CBR (Auto) refresh current
-A10
CKE ≤ VIL(MAX.), tCK = 15 ns
(Burst mode)
★
440
mA
1
mA
mA
mA
mA
Input signals are changed one time during 30 ns.
non power down mode
Operating current
-A80
Unit Notes
Input signals are changed one time during 30 ns.
non power down mode
Active standby current in
MAX.
Self refresh current
ICC6
CKE ≤ 0.2 V
Input leakage current
II(L)
VI = 0 to 3.6 V, All other pins not under test = 0 V
Output leakage current
IO(L)
High level output voltage
Low level output voltage
80
-A80
580
-A10
440
-A80
700
-A10
560
-A80
920
-A10
920
-A80
920
-A10
920
mA
2
mA
3
8
mA
–4
+4
µA
DOUT is disabled, VO = 0 to 3.6 V
–1.5
+1.5
µA
VOH
IO = – 4.0 mA
2.4
VOL
IO = + 4.0 mA
V
0.4
V
Notes 1. ICC1 depends on output loading and cycle rates. Specified values are obtained with the output open. In
addition to this, ICC1 is measured on condition that addresses are changed only one time during tCK(MIN.).
2. ICC4 depends on output loading and cycle rates. Specified values are obtained with the output open. In
addition to this, ICC4 is measured on condition that addresses are changed only one time during tCK(MIN.).
3. ICC5 is measured on condition that addresses are changed only one time during tCK(MIN.).
6
Data Sheet M14015EJ4V0DS00
MC-458CB641ES, 458CB641PS
AC Characteristics (Recommended Operating Conditions unless otherwise noted)
★ Test Conditions
Parameter
AC high level input voltage / low level input voltage
Value
Unit
2.4 / 0.4
V
1.4
V
1
ns
1.4
V
Input timing measurement reference level
Transition time (Input rise and fall time)
Output timing measurement reference level
tCK
tCH
CLK
tCL
2.4 V
1.4 V
0.4 V
tSETUP tHOLD
Input
2.4 V
1.4 V
0.4 V
tAC
tOH
Output
Data Sheet M14015EJ4V0DS00
7
MC-458CB641ES, 458CB641PS
Synchronous Characteristics
Parameter
Symbol
Clock cycle time
Access time from CLK
-A80
-A10
Unit
MIN.
MAX.
MIN.
MAX.
Note
/CAS latency = 3
tCK3
8
(125 MHz)
10
(100 MHz)
ns
/CAS latency = 2
tCK2
10
(100 MHz)
13
(77 MHz)
ns
/CAS latency = 3
tAC3
6
6
ns
1
/CAS latency = 2
tAC2
6
7
ns
1
CLK high level width
CLK low level width
tCH
3
3
ns
tCL
3
3
ns
/CAS latency = 3
tOH3
3
3
ns
1
/CAS latency = 2
tOH2
3
3
ns
1
tLZ
0
0
ns
/CAS latency = 3
tHZ3
3
6
3
6
ns
/CAS latency = 2
tHZ2
3
6
3
7
ns
Data-in setup time
tDS
2
2
ns
Data-in hold time
tDH
1
1
ns
Address setup time
tAS
2
2
ns
Address hold time
tAH
1
1
ns
CKE setup time
tCKS
2
2
ns
CKE hold time
tCKH
1
1
ns
CKE setup time (Power down exit)
tCKSP
2
2
ns
Command (/CS0, /RAS, /CAS, /WE,
DQMB0 - DQMB7) setup time
tCMS
2
2
ns
Command (/CS0, /RAS, /CAS, /WE,
DQMB0 - DQMB7) hold time
tCMH
1
1
ns
Data-out hold time
Data-out low-impedance time
Data-out high-impedance time
Note 1. Output load
Z = 50 Ω
Output
50 pF
Remark These specifications are applied to the monolithic device.
8
Data Sheet M14015EJ4V0DS00
MC-458CB641ES, 458CB641PS
Asynchronous Characteristics
Parameter
Symbol
-A80
MIN.
Unit
-A10
MAX.
MIN.
ACT to REF/ACT command period (Operation)
tRC
70
70
ns
REF to REF/ACT command period (Refresh)
tRC1
70
78
ns
ACT to PRE command period
tRAS
48
PRE to ACT command period
tRP
20
20
ns
Delay time ACT to READ/WRITE command
tRCD
20
20
ns
ACT(one) to ACT(another) command period
tRRD
16
20
ns
Data-in to PRE command period
/CAS latency = 3
tDPL3
8
10
ns
/CAS latency = 2
tDPL2
8
10
ns
Data-in to ACT(REF) command
/CAS latency = 3
tDAL3
1CLK+20
1CLK+20
ns
period (Auto precharge)
/CAS latency = 2
tDAL2
1CLK+20
1CLK+20
ns
tRSC
2
2
CLK
tT
0.5
Mode register set cycle time
Transition time
Refresh time (4,096 refresh cycles)
tREF
120,000
30
64
Data Sheet M14015EJ4V0DS00
50
1
Note
MAX.
120,000
ns
30
ns
64
ms
9
MC-458CB641ES, 458CB641PS
Serial PD
(1/2)
Byte No.
Function Described
Hex
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
Defines the number of bytes written into
serial PD memory
80H
1
0
0
0
0
0
0
0
128 bytes
1
Total number of bytes of serial PD memory
08H
0
0
0
0
1
0
0
0
256 bytes
2
Fundamental memory type
04H
0
0
0
0
0
1
0
0
SDRAM
3
Number of rows
0CH
0
0
0
0
1
1
0
0
12 rows
4
Number of columns
09H
0
0
0
0
1
0
0
1
9 columns
5
Number of banks
01H
0
0
0
0
0
0
0
1
1 bank
6
Data width
40H
0
1
0
0
0
0
0
0
64 bits
7
Data width (continued)
00H
0
0
0
0
0
0
0
0
0
8
Voltage interface
01H
0
0
0
0
0
0
0
1
LVTTL
9
CL = 3 Cycle time
-A80
80H
1
0
0
0
0
0
0
0
8 ns
-A10
A0H
1
0
1
0
0
0
0
0
10 ns
-A80
60H
0
1
1
0
0
0
0
0
6 ns
-A10
10
CL =3 Access time
60H
0
1
1
0
0
0
0
0
6 ns
11
DIMM configuration type
00H
0
0
0
0
0
0
0
0
None
12
Refresh rate/type
80H
1
0
0
0
0
0
0
0
Normal
13
SDRAM width
10H
0
0
0
1
0
0
0
0
×16
14
Error checking SDRAM width
00H
0
0
0
0
0
0
0
0
None
15
Minimum clock delay
01H
0
0
0
0
0
0
0
1
1 clock
16
Burst length supported
8FH
1
0
0
0
1
1
1
1
1, 2, 4, 8, F
17
Number of banks on each SDRAM
04H
0
0
0
0
0
1
0
0
4 banks
18
/CAS latency supported
06H
0
0
0
0
0
1
1
0
2, 3
19
/CS latency supported
01H
0
0
0
0
0
0
0
1
0
20
/WE latency supported
01H
0
0
0
0
0
0
0
1
0
21
SDRAM module attributes
00H
0
0
0
0
0
0
0
0
22
SDRAM device attributes : General
0EH
0
0
0
0
1
1
1
0
23
CL = 2 Cycle time
24
CL = 2 Access time
-A80
A0H
1
0
1
0
0
0
0
0
10 ns
-A10
D0H
1
1
0
1
0
0
0
0
13 ns
-A80
60H
0
1
1
0
0
0
0
0
6 ns
7 ns
-A10
70H
0
1
1
1
0
0
0
0
00H
0
0
0
0
0
0
0
0
-A80
14H
0
0
0
1
0
1
0
0
20 ns
-A10
14H
0
0
0
1
0
1
0
0
20 ns
-A80
10H
0
0
0
1
0
0
0
0
16 ns
-A10
14H
0
0
0
1
0
1
0
0
20 ns
-A80
14H
0
0
0
1
0
1
0
0
20 ns
-A10
14H
0
0
0
1
0
1
0
0
20 ns
-A80
30H
0
0
1
1
0
0
0
0
48 ns
-A10
32H
0
0
1
1
0
0
1
0
50 ns
10H
0
0
0
1
0
0
0
0
64M bytes
25-26
27
28
tRP(MIN.)
tRRD(MIN.)
29
tRCD(MIN.)
30
tRAS(MIN.)
31
10
Notes
Module bank density
Data Sheet M14015EJ4V0DS00
MC-458CB641ES, 458CB641PS
(2/2)
Byte No.
32
33
34
35
Function Described
63
64-71
72
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Notes
20H
0
0
1
0
0
0
0
0
2 ns
signal setup time
-A10
20H
0
0
1
0
0
0
0
0
2 ns
Command and address
-A80
10H
0
0
0
1
0
0
0
0
1 ns
signal hold time
-A10
10H
0
0
0
1
0
0
0
0
1 ns
Data signal input setup time
-A80
20H
0
0
1
0
0
0
0
0
2 ns
-A10
20H
0
0
1
0
0
0
0
0
2 ns
-A80
10H
0
0
0
1
0
0
0
0
1 ns
-A10
10H
0
0
0
1
0
0
0
0
1 ns
00H
0
0
0
0
0
0
0
0
-A80
12H
0
0
0
1
0
0
1
0
1.2 A
-A10
12H
0
0
0
1
0
0
1
0
1.2 A
-A80
E7H
1
1
1
0
0
1
1
1
-A10
4DH
0
1
0
0
1
1
0
1
-A80
64H
0
1
1
0
0
1
0
0
100 MHz
-A10
64H
0
1
1
0
0
1
0
0
100 MHz
Intel specification /CAS
-A80
87H
1
0
0
0
0
1
1
1
latency support
-A10
85H
1
0
0
0
0
1
0
1
Data signal input hold time
SPD revision
Checksum for bytes 0 - 62
Manufacture’s JEDEC ID code
Manufacturing location
Manufacture’s P/N
91-92
Revision code
93-94
Manufacturing date
95-98
Assembly serial number
99-126
Mfg specific
127
Bit 6
-A80
73-90
126
Bit 7
Command and address
36-61
62
Hex
Intel specification frequency
Timing Chart
Refer to the SYNCHRONOUS DRAM MODULE TIMING CHART Information (M13348E).
Data Sheet M14015EJ4V0DS00
11
MC-458CB641ES, 458CB641PS
★ Package Drawing
144-PIN DUAL IN-LINE MODULE (SOCKET TYPE)
A (AREA B)
Y
M1 (AREA B)
R
N
Q
M
L
M2 (AREA A)
S
A
H
(OPTIONAL HOLES)
U1
U2
C
I
T
E
B
D
A1 (AREA A)
F
ITEM
A
A1
B
detail of A part
W
D2
D1
X
V
MILLIMETERS
67.6
67.6±0.15
23.2
C
29.0
D
4.6
D1
1.5±0.10
D2
4.0
E
F
32.8
3.7
H
0.8 (T.P.)
I
3.3
L
M
20.0
25.4±0.15
M1
M2
N
3.4
22.0
3.8 MAX.
Q
R2.0
R
S
4.0±0.10
φ 1.8
T
1.0±0.1
U1
U2
3.2 MIN.
4.0 MIN.
V
0.25 MAX.
W
0.6±0.05
X
2.55 MIN.
Y
2.0 MIN.
M144S-80A15
12
Data Sheet M14015EJ4V0DS00
MC-458CB641ES, 458CB641PS
[MEMO]
Data Sheet M14015EJ4V0DS00
13
MC-458CB641ES, 458CB641PS
[MEMO]
14
Data Sheet M14015EJ4V0DS00
MC-458CB641ES, 458CB641PS
NOTES FOR CMOS DEVICES
1
PRECAUTION AGAINST ESD FOR SEMICONDUCTORS
Note:
Strong electric field, when exposed to a MOS device, can cause destruction of the gate oxide and
ultimately degrade the device operation. Steps must be taken to stop generation of static electricity
as much as possible, and quickly dissipate it once, when it has occurred. Environmental control
must be adequate. When it is dry, humidifier should be used. It is recommended to avoid using
insulators that easily build static electricity. Semiconductor devices must be stored and transported
in an anti-static container, static shielding bag or conductive material. All test and measurement
tools including work bench and floor should be grounded. The operator should be grounded using
wrist strap. Semiconductor devices must not be touched with bare hands. Similar precautions need
to be taken for PW boards with semiconductor devices on it.
2
HANDLING OF UNUSED INPUT PINS FOR CMOS
Note:
No connection for CMOS device inputs can be cause of malfunction. If no connection is provided
to the input pins, it is possible that an internal input level may be generated due to noise, etc., hence
causing malfunction. CMOS devices behave differently than Bipolar or NMOS devices. Input levels
of CMOS devices must be fixed high or low by using a pull-up or pull-down circuitry. Each unused
pin should be connected to V DD or GND with a resistor, if it is considered to have a possibility of
being an output pin. All handling related to the unused pins must be judged device by device and
related specifications governing the devices.
3
STATUS BEFORE INITIALIZATION OF MOS DEVICES
Note:
Power-on does not necessarily define initial status of MOS device. Production process of MOS
does not define the initial operation status of the device. Immediately after the power source is
turned ON, the devices with reset function have not yet been initialized. Hence, power-on does
not guarantee out-pin levels, I/O settings or contents of registers. Device is not initialized until the
reset signal is received. Reset operation must be executed immediately after power-on for devices
having reset function.
Data Sheet M14015EJ4V0DS00
15
MC-458CB641ES, 458CB641PS
CAUTION FOR HANDLING MEMORY MODULES
When handling or inserting memory modules, be sure not to touch any components on the modules, such as
the memory IC, chip capacitors and chip resistors. It is necessary to avoid undue mechanical stress on these
components to prevent damaging them.
When re-packing memory modules, be sure the modules are NOT touching each other. Modules in contact
with other modules may cause excessive mechanical stress, which may damage the modules.
• The information in this document is subject to change without notice. Before using this document, please
confirm that this is the latest version.
• No part of this document may be copied or reproduced in any form or by any means without the prior written
consent of NEC Corporation. NEC Corporation assumes no responsibility for any errors which may appear in
this document.
• NEC Corporation does not assume any liability for infringement of patents, copyrights or other intellectual property
rights of third parties by or arising from use of a device described herein or any other liability arising from use
of such device. No license, either express, implied or otherwise, is granted under any patents, copyrights or other
intellectual property rights of NEC Corporation or others.
• Descriptions of circuits, software, and other related information in this document are provided for illustrative
purposes in semiconductor product operation and application examples. The incorporation of these circuits,
software, and information in the design of the customer's equipment shall be done under the full responsibility
of the customer. NEC Corporation assumes no responsibility for any losses incurred by the customer or third
parties arising from the use of these circuits, software, and information.
• While NEC Corporation has been making continuous effort to enhance the reliability of its semiconductor devices,
the possibility of defects cannot be eliminated entirely. To minimize risks of damage or injury to persons or
property arising from a defect in an NEC semiconductor device, customers must incorporate sufficient safety
measures in its design, such as redundancy, fire-containment, and anti-failure features.
• NEC devices are classified into the following three quality grades:
"Standard", "Special", and "Specific". The Specific quality grade applies only to devices developed based on a
customer designated "quality assurance program" for a specific application. The recommended applications of
a device depend on its quality grade, as indicated below. Customers must check the quality grade of each device
before using it in a particular application.
Standard: Computers, office equipment, communications equipment, test and measurement equipment,
audio and visual equipment, home electronic appliances, machine tools, personal electronic
equipment and industrial robots
Special: Transportation equipment (automobiles, trains, ships, etc.), traffic control systems, anti-disaster
systems, anti-crime systems, safety equipment and medical equipment (not specifically designed
for life support)
Specific: Aircraft, aerospace equipment, submersible repeaters, nuclear reactor control systems, life
support systems or medical equipment for life support, etc.
The quality grade of NEC devices is "Standard" unless otherwise specified in NEC's Data Sheets or Data Books.
If customers intend to use NEC devices for applications other than those specified for Standard quality grade,
they should contact an NEC sales representative in advance.
M7 98. 8