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Part: PDM41256LA15SOITY
Category:
Memory
-> SRAM
-> Async. SRAM
Description: 256K Static RAM 32K X 8-bit
Company: IXYS Corporation
Datasheet: Download PDM41256LA15SOITY datasheet File size : 333 kB
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Datasheet text preview:
PDM41256
256K Static RAM 32K x 8-Bit
Features
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1 2 3 4 5 6 7
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.
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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
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Functional Block Diagram
A0 · · · · · A 14 Decoder Memory Matrix
Addresses
· · · · · ·
8 9 10
I/O 0 · · I/O 7
·····
Input Data Control
Column I/O
· ·
11 12
1
CE WE OE
·
Rev. 4.4 - 4/29/98
PDM41256
Pin Configurations TSOP (I)
OE AA1 1 A9 A8 W3 1 VE A cc A14 A2 1 A7 A6 A5 A4 3 22 23 24 25 26 27 18 2 3 4 5 6 7 21 10 19 18 17 16 15 14 13 12 11 9 0 8 2 C A10 IE I/O7 I/O6 I/O5 I/O4 VO3 / I ss I/O2 I/O1 AO0 / A0 A1 2
SOJ Pin Description
A14 A2 1 A7 A6 A5 A4 A3 A2 A1 I0 I/O0 I/O1 V2 /O ss 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 Vcc W AE A3 1 A8 A9 O1 1 AE C0 1 IE I/O7 I/O6 I/O5 I/O4 /O3
Name A14-A0 I/O7-I/O0 OE WE CE VCC VSS
Description Address Inputs Data Inputs/Outputs Output Enable Input Write Enable Input Chip Enable Input Power (+5V) Ground
Truth Table
OE X L X H WE X H L H CE H L L L I/O Hi-Z DOUT DIN Hi-Z MODE Standby Read Write Output Disable
NOTE: 1. H = VIH, L = VIL, X = DON'T CARE
Absolute Maximum Ratings (1)
Symbol VTERM 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 V °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 values: SOJ: 78 oC/W TSOP: 112 oC/W
2
Rev. 4.4 - 4/29/98
PDM41256 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
1 2 3
Unit
DC Electrical Characteristics (VCC = 5.0V ± 10%)
PDM41256SA 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) 2.2 -- -- 2.4 Max. 5 5 0.8 6.0 0.4 0.5 -- PDM41256LA Min. 1 1 0.5(1) 2.2 -- -- 2.4 Max. 1 1 0.8 6.0 0.4 0.5 -- µA µA V V V V
4 5 6 7
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 -8 -10 Com'l. 190 170 Ind. 200 180 -12 Com'l. 170 150 Ind. 180 160 -15 Com'l. 150 130 Ind. 160 140 Units mA mA
8 9 10 11 12
3
Power Com'l. Com'l. Ind. SA LA 210 190 200 180 210 190
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. 4.4 - 4/29/98
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