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Details, datasheet, quote on part number:PDM41257LA15SOITR
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Datasheet text preview:
PDM41257
256K Static RAM 256K x 1-Bit
Features
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1 2 3 4 5 6
Description
The PDM41257 is a high-performance CMOS static RAM organized as 262,144 x 1 bit. 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 goes LOW. The PDM41257 operates from a single +5V power supply and all the inputs and outputs are fully TTLcompatible. The PDM41257 comes in two versions, the standard power version PDM41257SA and a low power version the PDM41257LA. The two versions are functionally the same and only differ in their power consumption. The PDM41257 is available in a 24-pin 300-mil plastic SOJ for surface mount applications.
High-speed access times Com'l: 7, 8, 10, 12 and 15 ns Industrial: 8, 10, 12 and 15 ns Low power operation (typical) - PDM41257SA Active: 400 mW Standby: 150 mW - PDM41257LA Active: 350 mW Standby: 25 mW Single +5V (±10%) power supply TTL compatible inputs and outputs Packages Plastic SOJ (300 mil) - SO
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Functional Block Diagram
A0 · · Addresses · · · A17
7
Decoder · · · · · Memory Matrix
8 9
DOUT
····· DIN CE WE Column I/O
10 11 12
Rev. 2.2 - 4/27/98
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PDM41257 Pin Configuration SOJ
A0 A1 A2 A3 A4 A5 A6 A7 DOUT A8 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 13 14 Vcc
Pin Description
Name A17-A0 DIN DOUT WE CE VCC VSS Description Address Inputs Data Input Data Output Write Enable Input Chip Enable Input Power (+5V) Ground
A17 A16 A15 A14 A13 A12 A11 A10 A9 DIN
Vss
WE
CE
Truth Table
WE X H L CE H L L DOUT Hi-Z DOUT Hi-Z MODE Standby Read Write
NOTE: 1. H = VIH, L = VIL, X = DON'T CARE
Absolute Maximum Ratings (1)
Symbol TTERM TBIAS TSTG PT IOUT Tj Rating Terminal Voltage with Respect to VSS Temperature Under Bias Storage Temperature Power Dissipation DC Output Current Maximum Junction Temperature (2) Com'l. 0.5 to +7.0 55 to +125 55 to +125 1.0 50 125 Ind. 0.5 to +7.0 65 to +135 65 to +150 1.0 50 145 Unit °C °C °C W mA °C
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 * ja, where Ta is the ambient temperature, P is average operating power and ja the thermal resistance of the package. For this product, use the following ja value: SOJ: 83o C/W
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Rev. 2.2 - 4/27/98
PDM41257
Recommended DC Operating Conditions
Symbol VCC VSS 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
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DC Electrical Characteristics (VCC = 5.0V ± 10%)
PDM41257SA Symbol ILI ILO VIL VIH VOL VOH Parameter Input Leakage Current Output Leakage Current Input Low Voltage Input High Voltage Output Low Voltage Output High Voltage IOL = 8 mA, VCC = Min. IOL = 10 mA, VCC = Min. IOH = 4 mA, VCC = Min. Test Conditions VCC = MAX., VIN = VSS to VCC VCC= MAX., CE = VIH, VOUT = VSS to VCC Com'l/ Ind. Com'l/ Ind. Min. 5 5 0.5
(1)
PDM41257LA Min. 5 5 0.5
(1)
Max. 5 5 0.8 6.0 0.4 0.5 --
Max. 5 5 0.8 6.0 0.4 0.5 --
Unit µA µA V V V V V
4 5 6 7
2.2 -- -- 2.4
2.2 -- -- 2.4
NOTE: 1. VIL(min) = 3.0V for pulse width less than 20 ns.
Power Supply Characteristics
-7 Symbol Parameter ICC Operating Current CE = VIL f = fMAX = 1/tRC VCC = Max IOUT = 0 mA ISB Standby Current CE = VIH f = fMAX = 1/tRC VCC = Max ISB1 Full Standby Current CE VCC 0.2V f=0 VCC = Max VIN VCC 0.2V or 0.2V Power SA LA Com'l. 210 190 -8 Com'l. 200 180 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
8 9 10 11 12
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SA LA SA LA
90 90 20 5
80 80 20 5
80 80 20 5
70 70 20 5
70 70 20 5
60 60 20 5
60 60 20 5
50 50 20 5
50 50 20 5
mA mA mA mA
SHADED AREA = PRELIMINARY DATA NOTE: All values are maximum guaranteed values.
Rev. 2.2 - 4/27/98
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