SRAM_Datasheet - W24257A 32K 8 HIGH SPEED CMOS STATIC RAM...

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W24257A 32K × 8 HIGH SPEED CMOS STATIC RAM Publication Release Date: May 1997 - 1 - Revision A14 GENERAL DESCRIPTION The W24257A is a high speed, low power CMOS static RAM organized as 32768 × 8 bits that operates on a single 5-volt power supply. This device is manufactured using Winbond's high performance CMOS technology. FEATURES High speed access time: 10/12/15/20 nS (max.) Low power consumption: - Active: 400 mW (typ.) Single + 5V power supply Fully static operation All inputs and outputs directly TTL compatible Three-state outputs Available packages: 28-pin 300 mil SOJ, 330 mil SOP, skinny DIP and standard type one TSOP (8 mm × 13.4 mm) PIN CONFIGURATIONS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28-pin DIP 28 27 26 25 24 23 22 21 20 19 18 17 16 15 V DD WE A13 A8 A9 A11 OE A10 CS I/O8 I/O7 I/O6 I/O5 I/O4 A14 A12 A7 A6 A5 A4 A3 A2 A1 A0 I/O1 I/O2 I/O3 V 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 28-pin TSOP OE A11 A9 A8 A13 WE V DD A14 A12 A7 A6 A5 A4 A3 A10 CS I/O8 I/O7 I/O6 I/O5 I/O4 I/O3 I/O2 I/O1 A0 A1 A2 V SS BLOCK DIAGRAM A0 . . CS A14 WE I/O1 I/O8 OE V DD V SS . . DATA I/O DECODER CONTROL CORE ARRAY PIN DESCRIPTION SYMBOL DESCRIPTION A0 - A14 Address Inputs I/O1 - I/O8 Data Inputs/Outputs CS Chip Select Input WE Write Enable Input OE Output Enable Input V DD Power Supply V SS Ground
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W24257A - 2 - DC CHARACTERISTICS Absolute Maximum Ratings PARAMETER RATING UNIT Supply Voltage to V SS Potential -0.5 to +7.0 V Input/Output to V SS Potential -0.5 to V DD +0.5 V Allowable Power Dissipation 1.0 W Storage Temperature -65 to +150 ° C Operating Temperature 0 to +70 ° C Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability of the device. TRUTH TABLE CS OE WE MODE I/O1 - I/O8 V DD CURRENT H X X Not Selected High Z I SB , I SB1 L H H Output Disable High Z I DD L L H Read Data Out I DD L X L Write Data In I DD OPERATING CHARACTERISTICS (V DD = 5V ± 10%, V SS = 0V, T A = 0 to 70 ° C) PARAMETER SYM. TEST CONDITIONS MIN. TYP. MAX. UNIT Input Low Voltage V IL - -0.5 - +0.8 V Input High Voltage V IH - +2.2 - V DD +0.5 V Input Leakage Current I LI V IN = V SS to V DD -10 - +10 μ A Output Leakage Current I LO V I/O = V SS to V DD, CS = V IH or OE = V IH or WE = V IL -10 - +10 μ A Output Low Voltage V OL I OL = +8.0 mA - - 0.4 V Output High Voltage V OH I OH = -4.0 mA 2.4 - - V Operating Power I DD CS = V IL, I/O = 0 mA 10 - - 170 mA Supply Current Cycle = MIN 12 - - 160 mA Duty = 100% 15 150 mA 20 - - 140 mA Standby Power Supply Current I SB CS = V IH Cycle = MIN, Duty = 100% - - 30
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