SM532256LP
Modular Technologies
SMART
November 1995
Rev 1
SM532256LP
1MByte (256K x 32) CMOS DRAM Module
(Low Profile)
General Description
The SM532256LP is a high performance, 1-megabyte
dynamic RAM module organized as 256K words by 32
bits, in a 72-pin, leadless, SIMM package.
The module utilizes two CMOS 256Kx16 dynamic RAMs
in surface mount package on an epoxy laminate substrate.
Each device is accompanied by a decoupling capacitor for
improved noise immunity.
Control lines are so provided that byte control is possible.
•
•
•
•
Features
•
•
•
•
JEDEC Standard
High Density : 1 MByte
Fast Access Time of 60/70/80ns (max.)
Low Power :
Active :
0.99/0.88/0.82W (max.)
Standby :
22mW (max.) - TTL
11mW(max.) - CMOS
TTL-compatible inputs and outputs
Separate power and ground planes
Single power supply of 5V+10%
Low profile of 0.775 in.
Functional Diagram
CAS0#
CAS1#
256K x 16
DRAM
RAS0# RAS2#
256K x 16
DRAM
CAS2#
CAS3#
DQ0~DQ15
DQ16~DQ31
DQ0~DQ31
Notes: 1. A0~A8 to all devices.
2. WE# to all devices.
3. CAS0# : DQ0~DQ7
CAS1# : DQ8~DQ15
CAS2# : DQ16~DQ23
CAS3# : DQ24~DQ31
4. OE# of all devices is grounded.
V
CC
V
SS
Decoupling capacitors
to all DRAMs
(All specifications of this device are subject to change without notice)
Corporate Headquarters:
4305 Cushing Pkwy., Fremont, CA 94538, USA • Tel:(510) 623-1231 • Fax:(510) 623-1434 • E-mail: info@smartm.com
Europe:
36 Linford Forum, Rockingham Dr., Linford Wood, Milton Keynes, MK14 6LY, UK • Tel: + 44-1908 234030 • Fax: + 44-1908-234191
Asia/Pacific:
Suite 6A, 64 Canning Hwy., Victoria Park, Perth, WA 6106, Australia • Tel: + 61-9-361-9705 • Fax: + 61-9-361-9715
1
SM532256LP
Modular Technologies
SMART
November 1995
Rev 1
Pin Name
A0~A8
DQ0~DQ31
CAS0#~CAS3#
RAS0#, RAS2#
WE#
V
CC
V
SS
PD1~PD4
NC
Addresses
Data Inputs/Outputs
Column Address Strobes
Row Address Strobes
Write Enable
Power Supply
Ground
Presence Detects
No Connection
Pin
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
Pin
Designation
V
SS
DQ0
DQ16
DQ1
DQ17
DQ2
DQ18
DQ3
DQ19
V
CC
NC
A0
A1
A2
A3
A4
A5
A6
NC
DQ4
DQ20
DQ5
DQ21
DQ6
DQ22
DQ7
DQ23
A7
NC
V
CC
A8
NC
NC
RAS2#
NC
NC
Pin
No.
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
Pin
Designation
NC
NC
V
SS
CAS0#
CAS2#
CAS3#
CAS1#
RAS0#
NC
NC
WE#
NC
DQ8
DQ24
DQ9
DQ25
DQ10
DQ26
DQ11
DQ27
DQ12
DQ28
V
CC
DQ29
DQ13
DQ30
DQ14
DQ31
DQ15
NC
PD1
PD2
PD3
PD4
NC
V
SS
Presence Detect Pins
Access
60ns
V
SS
NC
NC
NC
Time
70ns
V
SS
NC
V
SS
NC
Pin
PD1
PD2
PD3
PD4
80ns
V
SS
NC
NC
V
SS
Ordering Information
Part Number
SM532256LP-6
SM532256LP-7
SM532256LP-8
Speed
60ns
70ns
80ns
Corporate Headquarters:
4305 Cushing Pkwy., Fremont, CA 94538, USA • Tel:(510) 623-1231 • Fax:(510) 623-1434 • E-mail: info@smartm.com
Europe:
36 Linford Forum, Rockingham Dr., Linford Wood, Milton Keynes, MK14 6LY, UK • Tel: + 44-1908 234030 • Fax: + 44-1908-234191
Asia/Pacific:
Suite 6A, 64 Canning Hwy., Victoria Park, Perth, WA 6106, Australia • Tel: + 61-9-361-9705 • Fax: + 61-9-361-9715
2
SM532256LP
Modular Technologies
SMART
November 1995
Rev 1
Absolute Maximum Ratings
Parameter
Voltage on any pin relative to V
SS
Power Dissipation
Operating Temperature
Storage Temperature
Short Circuit Output Current
Symbol
V
T
P
T
T
A
T
stg
I
OS
Ratings
- 1 to +7.0
2
0 to +70
- 55 to +125
50
Unit
V
W
°C
°C
mA
Recommended DC Operating Conditions
(T
A
= 0 to +70°C)
Parameter
Supply Voltage
Ground
Input High Voltage
Input Low Voltage
Symbol
V
CC
V
SS
V
IH
V
IL
Min
4.5
0
2.4
-1
Typ
5.0
0
-
-
Max
5.5
0
V
CC
+1
0.8
Unit
V
V
V
V
DC Characteristics
(V
CC
= 5V±10%, V
SS
= 0V, T
A
= 0 to +70 °C)
Parameter
Operating Current
Symbol
I
CC1
I
CC2
Standby Current
I
CC3
RAS#-only Refresh I
CC4
Current
CAS#-Before-RAS# I
CC5
Refresh Current
Fast Page Mode
I
CC6
Current
Test Conditions
t
RC
= min.
TTL Interface;
RAS#, CAS# = V
IH
D
out
= High-Z
CMOS Interface; RAS#,
CAS# V
CC
- 0.2V
D
out
= High-Z
CAS# = V
IH,
RAS#
Address cycling t
RC
= Min
t
RC
= Min., RAS#,
CAS# cycling
tPC = Min., RAS# = V
IL
CAS#, Address cycling
60ns
Min. Max.
-
180
-
4
70ns
Min. Max.
-
160
-
4
80ns
Min. Max.
-
150
-
4
Unit
mA
mA
Note
1, 2
-
-
-
-
2
180
180
120
-
-
-
-
2
160
160
110
-
-
-
-
2
150
150
100
mA
mA
mA
mA
2
1
1, 3
Corporate Headquarters:
4305 Cushing Pkwy., Fremont, CA 94538, USA • Tel:(510) 623-1231 • Fax:(510) 623-1434 • E-mail: info@smartm.com
Europe:
36 Linford Forum, Rockingham Dr., Linford Wood, Milton Keynes, MK14 6LY, UK • Tel: + 44-1908 234030 • Fax: + 44-1908-234191
Asia/Pacific:
Suite 6A, 64 Canning Hwy., Victoria Park, Perth, WA 6106, Australia • Tel: + 61-9-361-9705 • Fax: + 61-9-361-9715
3
SM532256LP
Modular Technologies
SMART
November 1995
Rev 1
DC Characteristics (contd.)
Parameter
Input Leakage Current
Output Leakage Current
Output High Voltage
Output Low Voltage
Notes:
Symbol
I
LI
I
LO
V
OH
V
OL
Test Conditions
0V V
in
V
CC
+0.5V
0V V
out
V
CC
Dout = Disable
High I
out
= -5mA
Low I
out
= 4.2mA
60ns
Min
Max
-20
20
-10
10
2.4
-
-
0.4
70ns
Min
Max
-20
20
-10
10
2.4
-
-
0.4
80ns
Min
Max
-20
20
-10
10
2.4
-
-
0.4
Unit
µA
µA
V
V
1. I
CC
depends on output load condition when the device is selected, ICC max. is specified at the output open condition.
2. Address can be changed less than two times while RAS# = V
IL
.
3. Address can be changed once or less while CAS# = V
IH
.
Capacitance
(T
A
=+25°C, V
CC
= 5V±10%)
Parameter
Input Capacitance (Address)
Input Capacitance (WE#)
Input Capacitance (RAS#, CAS#)
Input/Output Capacitance (DQ0 ~ DQ31)
Notes:
Capacitance sampled per Mil-Std-883.
Symbol
C
I1
C
I2
C
I3
C
I/O
Max.
15
17
10
12
Unit
pF
pF
pF
pF
AC Characteristics
(T
A
= 0 to +70 °C, V
CC
= 5.0V±10%, V
SS
= 0V)
1, 14
Parameter
Random read/write cycle time
Access time from RAS#
Access time from CAS#
Access time from column address
Output buffer turn-off time
Transition time (rise and fall)
RAS# precharge time
RAS# pulse width
RAS# hold time
Symbol
t
RC
t
RAC
t
CAC
t
AA
t
OFF
t
T
t
RP
t
RAS
t
RSH
60ns
Min
Max
110
-
-
60
-
15
-
30
0
15
3
50
40
-
60
10000
15
-
70ns
Min
Max
130
-
-
70
-
20
-
35
0
15
3
50
50
-
70
10000
20
-
80ns
Min
Max
150
-
-
80
-
20
-
40
0
15
3
50
60
-
80
10000
20
-
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
Notes
2, 3
3, 4, 13
3, 5, 13
6
7
Corporate Headquarters:
4305 Cushing Pkwy., Fremont, CA 94538, USA • Tel:(510) 623-1231 • Fax:(510) 623-1434 • E-mail: info@smartm.com
Europe:
36 Linford Forum, Rockingham Dr., Linford Wood, Milton Keynes, MK14 6LY, UK • Tel: + 44-1908 234030 • Fax: + 44-1908-234191
Asia/Pacific:
Suite 6A, 64 Canning Hwy., Victoria Park, Perth, WA 6106, Australia • Tel: + 61-9-361-9705 • Fax: + 61-9-361-9715
4
SM532256LP
Modular Technologies
SMART
November 1995
Rev 1
AC Characteristics
(contd.)
Parameter
CAS# hold time
CAS# pulse width
RAS# to CAS# delay time
RAS# to column address delay time
CAS# to RAS# precharge time
Row address set-up time
Row address hold time
Column address set-up time
Column address hold time
Column address to RAS# lead time
Read command set-up time
Read command hold time to CAS#
Read command hold time to RAS#
Write command hold time
Write command pulse width
Write command to RAS# lead time
Write command to CAS# lead time
Data-in set-up time
Data-in hold time
Refresh period (512 cycles)
Write command set-up time
CAS# set-up time (CBR refresh)
CAS# hold time (CBR refresh)
RAS# precharge to CAS# hold time
Access time from CAS# precharge
Fast page mode cycle time
CAS# precharge time (Fast page)
RAS# pulse width (Fast page)
Notes:
Symbol
t
CSH
t
CAS
t
RCD
t
RAD
t
CRP
t
ASR
t
RAH
t
ASC
t
CAH
t
RAL
t
RCS
t
RCH
t
RRH
t
WCH
t
WP
t
RWL
t
CWL
t
DS
t
DH
t
REF
t
WCS
t
CSR
t
CHR
t
RPC
t
ACP
t
PC
t
CP
t
RASC
60ns
Min
Max
60
-
15
10000
20
45
15
30
5
-
0
-
10
-
0
-
10
-
30
-
0
-
0
-
0
-
10
-
10
-
15
-
15
-
0
-
10
-
-
8
0
-
10
-
10
-
5
-
-
35
40
-
10
-
60
100000
70ns
Min
Max
70
-
20
10000
20
50
15
35
5
-
0
-
10
-
0
-
15
-
35
-
0
-
0
-
0
-
10
-
10
-
15
-
15
-
0
-
15
-
-
8
0
-
10
-
10
-
5
-
-
40
45
-
10
-
70
100000
80ns
Min
Max
80
-
20
10000
20
60
15
40
5
-
0
-
10
-
0
-
15
-
40
-
0
-
0
-
0
-
10
-
10
-
20
-
20
-
0
-
15
-
-
8
0
-
10
-
10
-
5
-
-
45
50
-
10
-
80
100000
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ms
ns
ns
ns
ns
ns
ns
ns
ns
Note
8
9
11
11
10
3, 13
12
1. AC measurements assume t
T
= 5ns.
2. Assumes that t
RCD
is greater than t
RCD
(max) and t
RAD
is less than t
RAD
(max). If t
RCD
or t
RAD
is greater than the
maximum recommended value shown in this table, t
RAC
exceeds the value shown.
3. Measured with a load circuit equivalent to 2 TTL loads and 100pF.
4. Assumes that t
RCD
is greater than t
RCD
(max) and t
RAD
is less than t
RAD
(max).
5. Assumes that t
RCD
is less than t
RCD
(max) and t
RAD
is greater than t
RAD
(max).
6. t
OFF
(max) defines the time at which the output achieves the open circuit condition and is not referenced to output
voltage levels.
7. V
IH
(min) and V
IL
(max) are reference levels for measuring timing of input signals. Also, transition times are measured
between V
IH
and V
IL
.
Corporate Headquarters:
4305 Cushing Pkwy., Fremont, CA 94538, USA • Tel:(510) 623-1231 • Fax:(510) 623-1434 • E-mail: info@smartm.com
Europe:
36 Linford Forum, Rockingham Dr., Linford Wood, Milton Keynes, MK14 6LY, UK • Tel: + 44-1908 234030 • Fax: + 44-1908-234191
Asia/Pacific:
Suite 6A, 64 Canning Hwy., Victoria Park, Perth, WA 6106, Australia • Tel: + 61-9-361-9705 • Fax: + 61-9-361-9715
5
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