PDM41256
256K Static RAM
32K x 8-Bit
Features
High-speed access times Com’l: 7, 8, 10, 12 and 15ns Ind’l: 8, 10, 12 and 15ns
(use 15ns for slower designs) Low power operation (typical)
-PDM41256SA Active: 475 mW Standby: 100 mW
-PDM41256LA Active: 425mW Standby: 25 mW
Single +5V (±10%) power supply TTL-compatible inputs and outputs Packages
Plastic SOJ (300 mil) - SO Plastic TSOP (I) - T
Description
The PDM41256 is a high-performance CMOS static RAM organized as 32,768 x 8 bits. 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 PDM41256 operates from a single +5V power supply and all the inputs and outputs are fully TTLcompatible. The PDM41256 comes in two versions: the standard power version PDM41256SA and the low power version PDM41256LA. Both versions are functionally the same and differ only in their power consumption.
The PDM41256 is available in a 28-pin plastic TSOP
(I) and a 28-pin 300-mil plastic SOJ.
Functional Block Diagram
A 0 |
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Decoder |
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Memory |
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Addresses • |
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Matrix |
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A 14 |
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I/O0 |
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Input |
Column I/O |
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Data |
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Control |
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I/O7 |
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CE |
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WE |
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OE |
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Rev. 4.4 - 4/29/98 |
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PDM41256
Pin Configurations |
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SOJ |
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Pin Description |
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TSOP (I) |
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A14 |
1 |
28 |
Vcc |
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Name |
Description |
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A10 |
A12 |
2 |
27 |
WE |
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OE |
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21 |
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A13 |
A14-A0 |
Address Inputs |
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A11 |
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23 |
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20 |
CE |
A7 |
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26 |
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A9 |
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24 |
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19 |
I/O7 |
A6 |
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25 |
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A8 |
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A8 |
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25 |
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18 |
I/O6 |
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I/O7-I/O0 |
Data Inputs/Outputs |
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A13 |
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26 |
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17 |
I/O5 |
A5 |
5 |
24 |
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A9 |
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WE |
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27 |
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16 |
I/O4 |
A4 |
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23 |
A11 |
OE |
Output Enable Input |
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Vcc |
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28 |
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15 |
I/O3 |
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A14 |
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1 |
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Vss |
A3 |
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22 |
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OE |
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WE |
Write Enable Input |
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A12 |
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2 |
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I/O2 |
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A7 |
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3 |
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12 |
I/O1 |
A2 |
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21 |
A10 |
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CE |
Chip Enable Input |
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A6 |
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4 |
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I/O0 |
A1 |
9 |
20 |
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CE |
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VCC |
Power (+5V) |
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A5 |
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5 |
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10 |
A0 |
A0 |
10 |
19 |
I/O7 |
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A4 |
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6 |
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A1 |
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VSS |
Ground |
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A3 |
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A2 |
I/O0 |
11 |
I/O6 |
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I/O1 |
12 |
17 |
I/O5 |
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I/O2 |
13 |
16 |
I/O4 |
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Vss |
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I/O3 |
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Truth Table
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OE |
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WE |
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CE |
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I/O |
MODE |
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X |
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X |
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H |
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Hi-Z |
Standby |
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L |
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H |
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L |
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DOUT |
Read |
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X |
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L |
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L |
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DIN |
Write |
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H |
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H |
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L |
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Hi-Z |
Output Disable |
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NOTE: 1. H = VIH, L = VIL, X = DON’T CARE
Absolute Maximum Ratings (1)
Symbol |
Rating |
Com’l. |
Ind. |
Unit |
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VTERM |
Terminal Voltage with Respect to Vss |
–0.5 to +7.0 |
–0.5 to +7.0 |
V |
TBIAS |
Temperature Under Bias |
–55 to +125 |
–65 to +135 |
°C |
TSTG |
Storage Temperature |
–55 to +125 |
–65 to +150 |
°C |
PT |
Power Dissipation |
1.0 |
1.0 |
W |
IOUT |
DC Output Current |
50 |
50 |
mA |
T |
Maximum Junction Temperature (2) |
125 |
145 |
°C |
j |
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NOTE: 1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS 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 maximum rating conditions for extended periods may affect reliability.
2.Appropriate thermal calculations should be performed in all cases and specifically for
those where the chosen package has a large thermal resistance (e.g., TSOP). The
calculation should be of the form: Tj = Ta + P * θja where Ta is the ambient temperature, P is average operating power and θja the thermal resistance of the package. For this product, use the following θja values:
SOJ: 78 oC/W TSOP: 112 oC/W
2 |
Rev. 4.4 - 4/29/98 |
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PDM41256 |
Recommended DC Operating Conditions |
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Symbol |
Parameter |
Min. |
Typ. |
Max. |
Unit |
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VCC |
Supply Voltage |
4.5 |
5.0 |
5.5 |
V |
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VSS |
Supply Voltage |
0 |
0 |
0 |
V |
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Commercial |
Ambient Temperature |
0 |
25 |
70 |
°C |
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Industrial |
Ambient Temperature |
–40 |
25 |
85 |
°C |
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DC Electrical Characteristics (VCC = 5.0V ± 10%)
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PDM41256SA |
PDM41256LA |
Unit |
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Symbol |
Parameter |
Test Conditions |
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Min. |
Max. |
Min. |
Max. |
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ILI |
Input Leakage Current |
VCC = MAX., VIN = Vss to VCC |
Com’l/ |
–5 |
5 |
–1 |
1 |
A |
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Ind. |
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ILO |
Output Leakage Current |
VCC= MAX., |
Com’l/ |
–5 |
5 |
–1 |
1 |
A |
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CE |
= VIH, VOUT = Vss to VCC |
Ind. |
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VIL |
Input Low Voltage |
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–0.5(1) |
0.8 |
–0.5(1) |
0.8 |
V |
VIH |
Input High Voltage |
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2.2 |
6.0 |
2.2 |
6.0 |
V |
VOL |
Output Low Voltage |
IOL=8 mA, VCC = Min. |
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0.4 |
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0.4 |
V |
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IOL = 10 mA, VCC = Min. |
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0.5 |
— |
0.5 |
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VOH |
Output High Voltage |
IOH = –4 mA, VCC = Min. |
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2.4 |
— |
2.4 |
— |
V |
NOTE: 1. VIL(min) = –3.0V for pulse width less than 20 ns.
Power Supply Characteristics
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-7 |
-8 |
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-10 |
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-12 |
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-15 |
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Symbol |
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Parameter |
Power |
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Com’l. |
Com’l. |
Ind. |
Com’l. |
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Com’l. |
Ind. |
Com’l. |
Ind. |
Units |
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ICC |
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Operating Current |
SA |
210 |
200 |
210 |
190 |
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200 |
170 |
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180 |
150 |
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160 |
mA |
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CE |
= VIL |
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f = fMAX = 1/tRC |
LA |
190 |
180 |
190 |
170 |
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180 |
150 |
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160 |
130 |
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140 |
mA |
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VCC = Max |
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IOUT = 0 mA |
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ISB |
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Standby Current |
SA |
90 |
80 |
80 |
70 |
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70 |
60 |
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60 |
50 |
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50 |
mA |
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CE |
= VIH |
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f = fMAX = 1/tRC |
LA |
90 |
80 |
80 |
70 |
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70 |
60 |
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60 |
50 |
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50 |
mA |
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VCC = Max |
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ISB1 |
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Full Standby Current |
SA |
20 |
20 |
20 |
20 |
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20 |
20 |
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20 |
20 |
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20 |
mA |
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CE |
≥ VCC – 0.2V |
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f = 0 |
LA |
5 |
5 |
5 |
5 |
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5 |
5 |
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5 |
5 |
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5 |
mA |
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VCC = Max |
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VIN ≥ VCC – 0.2V or ≤ 0.2V |
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SHADED AREA = PRELIMINARY DATA
NOTE:All values are maximum guaranteed values.
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Rev. 4.4 - 4/29/98 |
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