PDF AS7C251MNTF18A Data sheet ( Hoja de datos )

Número de pieza	AS7C251MNTF18A
Descripción	2.5V 1M x 18 Flowthrough Synchronous SRAM
Fabricantes	Alliance Semiconductor Corporation
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No Preview Available ! December 2004 AS7C251MNTF18A ® 2.5V 1M x 18 Flowthrough Synchronous SRAM with NTDTM Features • Organization: 1,048,576 words × 18 bits • NTD™ architecture for efficient bus operation • Fast clock to data access: 7.5/8.5/10 ns • Fast OE access time: 3.5/4.0 ns • Fully synchronous operation • Flow-through mode • Asynchronous output enable control • Available in 100-pin TQFP package www.DataSheet4U.com • Individual byte write and global write • Clock enable for operation hold • Multiple chip enables for easy expansion • 2.5V core power supply • Self-timed write cycles • Interleaved or linear burst modes • Snooze mode for standby operation Logic block diagram A[19:0] 20 CE0 CE1 CE2 R/W BWa BWb ADV / LD LBO ZZ DQ Aredgdirsetesrs burst logic CLK Control logic CLK DQ [a,b] 18 D Data input Q register CLK CLK CEN Selection guide Minimum cycle time Maximum clock access time Maximum operating current Maximum standby current Maximum CMOS standby current (DC) -75 8.5 7.5 275 90 60 20 DQ Write delay addr. registers CLK 20 CLK 1M x 18 SRAM array 18 18 18 18 Output buffer OE 18 OE DQ [a,b] -85 -10 10 12 8.5 10 250 230 80 80 60 60 Units ns ns mA mA mA 12/23/04, v 1.1 Alliance Semiconductor P. 1 of 18 Copyright © Alliance Semiconductor. All rights reserved. 1 page AS7C251MNTF18A ® Signal descriptions Signal CLK CEN A, A0, A1 DQ[a,b] CE0, CE1, CE2 www.DataSheetA4UD.cVom/LD R/W BW[a,b] OE LBO ZZ NC I/O Properties Description I CLOCK Clock. All inputs except OE, LBO, and ZZ are synchronous to this clock. I SYNC Clock enable. When de-asserted high, the clock input signal is masked. I SYNC Address. Sampled when all chip enables are active and ADV/LD is asserted. I/O SYNC Data. Driven as output when the chip is enabled and OE is active. I SYNC Synchronous chip enables. Sampled at the rising edge of CLK, when ADV/LD is asserted. Are ignored when ADV/LD is high. I SYNC Advance or Load. When sampled high, the internal burst address counter will increment in the order defined by the LBO input value. When low, a new address is loaded. I SYNC A high during LOAD initiates a READ operation. A low during LOAD initiates a WRITE operation. Is ignored when ADV/LD is high. I SYNC Byte write enables. Used to control write on individual bytes. Sampled along with WRITE command and BURST WRITE. I ASYNC Asynchronous output enable. I/O pins are not driven when OE is inactive. I STATIC Selects Burst mode. When tied to VDD or left floating, device follows interleaved Burst order. When driven Low, device follows linear Burst order. This signal is internally pulled High. I ASYNC Snooze. Places device in low power mode; data is retained. Connect to GND if unused. - - No connect Snooze Mode SNOOZE MODE is a low current, power-down mode in which the device is deselected and current is reduced to ISB2. The duration of SNOOZE MODE is dictated by the length of time the ZZ is in a High state. The ZZ pin is an asynchronous, active high input that causes the device to enter SNOOZE MODE. When the ZZ pin becomes a logic High, ISB2 is guaranteed after the time tZZI is met. After entering SNOOZE MODE, all inputs except ZZ is disabled and all outputs go to High-Z. Any operation pending when entering SNOOZE MODE is not guaranteed to successfully complete. Therefore, SNOOZE MODE (READ or WRITE) must not be initiated until valid pending operations are completed. Similarly, when exiting SNOOZE MODE during tPUS, only a DESELECT or READ cycle should be given while the SRAM is transitioning out of SNOOZE MODE. 12/23/04, v 1.1 Alliance Semiconductor P. 5 of 18 5 Page Timing waveform of write cycle CLK tCES tCEH CEN www.DataSheet4U.com Address tAS tAH A1 A2 ® tCH tCL AS7C251MNTF18A tCYC A3 R/W BWn CE0,CE2 tCSH CE1 ADV/LD tADVS tADVH OE Din Dout Q(n-2) D(A1) tHZOE Q(n-1) D(A2) D(A2Y‘01) tDS tDH D(A3) D(A2Y‘10) D(A2Y‘11) Write D(A1) DSEL Write D(A2) Continue Continue Continue Write Write Write D(A2Y‘01) D(A2Y‘10) D(A2Y‘11) Inhibit Clock Write D(A3) Continue Write D(A3Y‘01) 12/23/04, v 1.1 Alliance Semiconductor P. 11 of 18 11 Page

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Hoja de datos destacado

Número de pieza	Descripción	Fabricantes
AS7C251MNTF18A	2.5V 1M x 18 Flowthrough Synchronous SRAM	Alliance Semiconductor Corporation

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