DATA SHEET
MOS INTEGRATED CIRCUIT
μ
PD43256B-X
256K-BIT CMOS STATIC RAM
32K-WORD BY 8-BIT
EXTENDED TEMPERATURE OPERATION
Description
The
μ
PD43256B-X is a high speed, low power, and 262,144 bits (32,768 words by 8 bits) CMOS static RAM.
The
μ
PD43256B-X is an extended-operating-temperature version of the
μ
PD43256B (X version : T
A
= –25 to +85°C).
And A and B versions are low voltage operations. Battery backup is available.
The
μ
PD43256B-X is packed in 28-pin PLASTIC TSOP (I) (8 x 13.4 mm).
Features
•
32,768 words by 8 bits organization
•
Fast access time: 70, 85, 100, 120, 150 ns (MAX.)
•
Operating ambient temperature: T
A
= –25 to +85
°C
•
Low voltage operation (A version: V
CC
= 3.0 to 5.5 V, B version: V
CC
= 2.7 to 5.5 V)
•
Low V
CC
data retention: 2.0 V (MIN.)
•
/OE input for easy application
Part number
Access time
ns (MAX.)
Operating supply Operating ambient
voltage
V
temperature
°C
−25
to +85
At operating
mA (MAX.)
45
Supply current
At standby
At data retention
μ
A (MAX.)
50
μ
A (MAX.)
Note1
2
μ
PD43256B-xxX
μ
PD43256B-AxxX
μ
PD43256B-BxxX
Note2
85
Note2
70, 85
, 100, 120
Note2
Note2
4.5 to 5.5
3.0 to 5.5
2.7 to 5.5
100, 120
, 150
Note2
40
Notes 1.
T
A
≤
40
°C,
V
CC
= 3.0 V
2.
100 ns (MAX.) (V
CC
= 4.5 to 5.5 V)
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 products and/or types are available in every country. Please check with an NEC Electronics
sales representative for availability and additional information.
Document No. M11012EJ6V0DS00 (6th edition)
Date Published June 2006 NS CP (K)
Printed in Japan
1995
μ
PD43256B-X
Pin Configurations (Marking Side)
/xxx indicates active low signal.
28-pin PLASTIC TSOP(I) (8x13.4) (Normal bent)
[
μ
PD43256BGW-xxX-9JL]
[
μ
PD43256BGW-AxxX-9JL]
[
μ
PD43256BGW-BxxX-9JL]
[
μ
PD43256BGW-xxX-9JL-A]
[
μ
PD43256BGW-AxxX-9JL-A]
[
μ
PD43256BGW-BxxX-9JL-A]
/OE
A11
A9
A8
A13
/WE
V
CC
A14
A12
A7
A6
A5
A4
A3
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
A10
/CS
I/O8
I/O7
I/O6
I/O5
I/O4
GND
I/O3
I/O2
I/O1
A0
A1
A2
28-pin PLASTIC TSOP(I) (8x13.4) (Reverse bent)
[
μ
PD43256BGW-xxX-9KL]
[
μ
PD43256BGW-AxxX-9KL]
[
μ
PD43256BGW-BxxX-9KL]
[
μ
PD43256BGW-xxX-9KL-A]
[
μ
PD43256BGW-AxxX-9KL-A]
[
μ
PD43256BGW-BxxX-9KL-A]
A10
/CS
I/O8
I/O7
I/O6
I/O5
I/O4
GND
I/O3
I/O2
I/O1
A0
A1
A2
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
/OE
A11
A9
A8
A13
/WE
V
CC
A14
A12
A7
A6
A5
A4
A3
A0 - A14
I/O1 - I/O8
/CS
/WE
: Address inputs
: Data inputs / outputs
: Chip Select
: Write Enable
/OE
V
CC
GND
:
:
:
Output Enable
Power supply
Ground
Remark
Refer to
Package Drawings
for the 1-pin index mark.
Data Sheet M11012EJ6V0DS
3
μ
PD43256B-X
Electrical Specifications
Absolute Maximum Ratings
Parameter
Supply voltage
Input / Output voltage
Operating ambient temperature
Storage temperature
Symbol
V
CC
V
T
T
A
T
stg
Condition
Rating
–0.5
–0.5
Note
Unit
V
V
°C
°C
to +7.0
Note
to V
CC
+ 0.5
–25 to +85
–55 to +125
Note
–3.0 V (MIN.) (Pulse width : 50 ns)
Caution Exposing the device to stress above those listed in Absolute Maximum Rating 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
μ
PD43256B-xxX
MIN.
MAX.
5.5
V
CC
+0.5
+0.6
+85
μ
PD43256B-AxxX
MIN.
3.0
2.4
–0.3
Note
μ
PD43256B-BxxX
MIN.
2.7
2.4
–0.3
Note
Unit
MAX.
5.5
V
CC
+0.5
+0.4
+85
MAX.
5.5
V
CC
+0.5
+0.4
+85
V
V
V
°C
Supply voltage
High level input voltage
Low level input voltage
Operating ambient temperature
V
CC
V
IH
V
IL
T
A
4.5
2.4
–0.3
Note
–25
–25
–25
Note
–3.0 V (MIN.) (Pulse width: 50 ns)
Capacitance (T
A
= 25°C, f = 1 MHz)
Parameter
Input capacitance
Input / Output capacitance
Symbol
C
IN
C
I/O
V
IN
= 0 V
V
I/O
= 0 V
Test conditions
MIN.
TYP.
MAX.
5
8
Unit
pF
pF
Remarks 1.
V
IN
: Input voltage
V
I/O
: Input / Output voltage
2.
These parameters are periodically sampled and not 100% tested.
Data Sheet M11012EJ6V0DS
5
Microcontroller MCU
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