PDM41298
256K Static RAM
64K x 4-Bit with OE
F eatures
s
High-speed access times
Com’l: 7, 8, 10, 12 and 15 ns
Ind’l: 8, 10, 12 and 15 ns
s
Low power operation (typical)
- PDM41298SA
Active: 400 mW
Standby: 150 mW
- PDM41298LA
Active: 350 mW
Standby: 25 mW
s
Output Enable pin available for greater system
flexibility
s
Single +5V (±10%) power supply
s
TTL compatible inputs and outputs
s
Packages
Plastic SOJ (300 mil) - TSO
Plastic TSOP - T
Description
The PDM41298 is a high-performance CMOS static
RAM organized as 65,536 x 4 bits. This product is
produced in Paradigm’s proprietary CMOS
technology which offers the designer the highest
speed parts. Writing to this device is accomplished
when the write enable (WE) and the chip enable
(CE) inputs are both LOW. Reading is accomplished
when WE remains HIGH and CE and OE are both
LOW.
The PDM41298 operates from a single +5V power
supply and all the inputs and outputs are fully TTL-
compatible. The PDM41298 comes in two versions,
the standard power version PDM41298SA and a low
power version the PDM41298LA. The two versions
are functionally the same and only differ in their
power consumption.
The PDM41298 is available in a 28-pin plastic TSOP,
and a 28-pin 300-mil plastic SOJ for surface mount
applications.
1
2
3
4
5
6
7
8
9
10
11
12
Functional Block Diagram
Rev. 1.1 - 7/17/96
3-17
PDM41298
Pin Configuration
SOJ
TSOP
Pin Description
Name
A15-A0
I/O3-I/O0
OE
WE
CE
NC
V
CC
V
SS
Description
Address Inputs
Data Inputs/Outputs
Output Enable Input
Write Enable Input
Chip Enable Input
No Connect
Power (+5V)
Ground
Truth Table
OE
X
L
X
H
WE
X
H
L
H
CE
H
L
L
L
I/O
Hi-Z
D
OUT
D
IN
Hi-Z
MODE
Standby
Read
Write
Output Disable
NOTE: 1. H = V
IH
, L = V
IL
, X = DON’T CARE
Absolute Maximum Ratings
(1)
Symbol
V
TERM
T
BIAS
T
STG
P
T
I
OUT
Rating
Terminal Voltage with Respect V
SS
Temperature Under Bias
Storage Temperature
Power Dissipation
DC Output Current
Com’l.
–0.5 to +7.0
–55 to +125
–55 to +125
1.0
50
Ind.
–0.5 to +7.0
–65 to +135
–65 to +150
1.0
50
Unit
V
°C
°C
W
mA
NOTE: 1. Stresses greater than those listed under ABSOLUTE MAXIMUM RA
TINGS may
cause permanent damage to the device. This is a stress rating only and functional
operation of the device at these or any other conditions above those indicated in the
operational sections of this specification is not implied. Exposure to absolute maxi-
mum rating conditions for extended periods may affect reliability.
Recommended DC Operating Conditions
Symbol
V
CC
V
SS
Commercial
Industrial
Parameter
Supply Voltage
Supply Voltage
Ambient Temperature
Ambient Temperature
Min.
4.5
0
0
–40
Typ.
5.0
0
25
25
Max.
5.5
0
70
85
Unit
V
V
°C
°C
3-18
Rev. 2.0 - 7/17/96
PDM41298
DC Electrical Characteristics
(V
CC
= 5.0V ± 10%)
Symbol
Parameter
Test Conditions
PDM41298SA
Min.
I
LI
I
LO
V
IL
V
IH
V
OL
V
OH
Input Leakage Current
Output Leakage Current
Input Low Voltage
Input High Voltage
Output Low Voltage
Output High Voltage
I
OL
= 8 mA, V
CC
= Min.
I
OL
= 10 mA, V
CC
= Min.
I
OH
= –4 mA, V
CC
= Min.
V
CC
= MAX., V
IN
= V
SS
to V
CC
V
CC
= MAX.,
CE = V
IH
, V
OUT
= V
SS
to V
CC
Com’l/
Ind.
Com’l/
Ind.
–5
–5
–0.5
(1)
2.2
—
—
2.4
Max.
5
5
0.8
6.0
0.4
0.5
—
PDM41298LA
Min.
–5
–5
–0.5
(1)
2.2
—
—
2.4
Max.
5
5
0.8
6.0
0.4
0.5
—
µA
µA
V
V
V
V
V
Unit
1
2
3
4
5
NOTE: 1. V
IL
(min) = –3.0V for pulse width less than 20 ns.
Power Supply Characteristics
-7
Symbol Parameter
I
CC
Operating Current
CE = V
IL
f = f
MAX
= 1/t
RC
V
CC
= Max
I
OUT
= 0 mA
I
SB
Standby Current
CE = V
IH
f = f
MAX
= 1/t
RC
V
CC
= Max
I
SB1
Full Standby Current
CE
≥
V
CC
– 0.2V
f=0
V
CC
= Max
V
IN
≥
V
CC
– 0.2V or
≤
0.2V
-8
Ind.
210
190
-10
Com’l.
190
170
Ind.
200
180
-12
Com’l.
180
160
Ind.
190
170
-15
Com’l.
170
150
Ind.
180
160
Units
mA
mA
Power Com’l. Com’l.
SA
LA
210
190
200
180
6
7
8
9
10
SA
LA
SA
LA
90
90
20
5
80
80
20
5
80
80
20
10
70
70
20
5
70
70
20
10
60
60
20
5
60
60
20
10
50
50
20
5
50
50
20
10
mA
mA
mA
mA
SHADED AREA = PRELIMINARY DATA
NOTE:All values are maximum guaranteed values.
Capacitance
(1)
(T
A
= +25°C, f =1.0 MHz)
Symbol
C
IN
C
OUT
Parameter
Input Capacitance
Output Capacitance
Max.
8
8
Unit
pF
pF
11
12
NOTE: 1. This parameter is determined by device characterization but is not production tested.
Rev. 2.0 - 7/17/96
3-19
PDM41298
AC Test Conditions
Input pulse levels
Input rise and fall times
Input timing reference levels
Output reference levels
Output load
V
SS
to 3.0V
3 ns
1.5V
1.5V
See Figures 1 and 2
Figure 1. Output Load Equivalent
Figure 2. Output Load Equivalent
(for t
LZCE
, t
HZCE
, t
LZWE
, t
HZWE
, t
LZOE
,
t
HZOE
)
Figure 3.
3-20
Rev. 2.0 - 7/17/96
PDM41298
Read Cycle No. 1
(1)
1
2
3
Read Cycle No. 2
(2)
4
5
6
AC Electrical Characteristics
Description
READ Cycle
READ cycle time
Address access time
Chip enable access time
Output hold from address change
Chip enable to output in low Z
(3, 4, 5)
Chip disable to output in high Z
(3, 4, 5)
Chip enable to power up time
(4)
Chip disable to power down time
(4)
Output enable access time
Output enable to output in low Z
(4, 5)
Output disable to output in high Z
(4, 5)
Sym
t
RC
t
AA
t
ACE
t
OH
t
LZCE
t
HZCE
t
PU
t
PD
t
AOE
t
LZOE
t
HZOE
0
8
0
7
5
0
8
3
5
7
0
8
5
0
8
--7
(6)
--8
(6)
-10
(6)
-12
-15
7
Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Units
7
7
7
3
5
8
0
10
5
0
8
8
8
8
3
5
10
0
12
6
0
8
10
10
10
3
5
10
0
15
8
12
12
12
3
5
10
15
15
15
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
8
9
10
11
12
3-21
SHADED AREA = PRELIMINARY DATA.
Notes referenced are after Data Retention Table.
Rev. 2.0 - 7/17/96
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