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AS7C331MNTF18, AS7C331MPFD18A, AS7C331MPFD18A133TQ

Table of contents:
Info of AS7C331MNTF18
Info of AS7C331MPFD18A
Info of AS7C331MPFD18A133TQ

AS7C331MNTF18, AS7C331MPFD18A, AS7C331MPFD18A133TQ Selling Leads, Datasheet

MFG:ALLANCE Package Cooled:TQFP D/C:05+

AS7C331MNTF18, AS7C331MPFD18A, AS7C331MPFD18A133TQ Picture

AS7C331MNTF18, AS7C331MPFD18A, AS7C331MPFD18A133TQ Datasheet download

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Part Number: AS7C331MNTF18

MFG: ALLANCE

Package Cooled: TQFP

D/C: 05+

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AS7C331MPFD18A General Description

The AS7C331MPFD18A is a high-performance CMOS 16-Mbit synchronous Static Random Access Memory (SRAM) device organized as 1,048,576 words X 18 bits and incorporates a two-stage register-register pipeline for highest frequency on any given technology.

Fast cycle times of 6/7.5 ns with clock access times (t_CD) of 3.4/3.8 ns enable 166, and 133 MHz bus frequencies. Three chip enable (CE) inputs permit easy memory expansion. Burst operation is initiated in one of two ways: the controller address strobe (ADSC), or the processor address strobe (ADSP). The burst advance pin (ADV) allows subsequent internally generated burst addresses.

Read cycles are initiated with ADSP (regardless of WE and ADSC) using the new external address clocked into the on-chip address register when ADSP is sampled low, the chip enables are sampled active, and the output buffer is enabled with OE. In a read operation, the data accessed by the current address registered in the address registers by the positive edge of CLK are carried to the data-out registers and driven on the output pins on the next positive edge of CLK. ADV is ignored on the clock edge that samples ADSP asserted, but is sampled on all subsequent clock edges. Address is incremented internally for the next access of the burst when ADV is sampled low and both address strobes are high. Burst mode is selectable with theLBOinput. With LBO unconnected or driven high, burst operations use an interleaved count sequence. WithLBOdriven low, the device uses a linear count sequence.

Write cycles are performed by disabling the output buffers with OE and asserting a write command. A global write enable GWE writes all 18 bits regardless of the state of individual BW[a,b]inputs. Alternately, when GWE is high, one or more bytes may be written by asserting BWE and the appropriate individual byte BWn signals.

BWn is ignored on the clock edge that samples ADSP low, but it is sampled on all subsequent clock edges. Output buffers are disabled when BWnis sampled LOW regardless of OE. Data is clocked into the data input register when BWn is sampled low. Address is incremented internally to the next burst address if BWn and ADV are sampled low. This device operates in doublecycle deselect feature during read cycles.

Read or write cycles may also be initiated with ADSC instead of ADSP. The differences between cycles initiated withADSCand ADSP are as follows:
• ADSP must be sampled high when ADSC is sampled low to initiate a cycle with ADSC.
•WE signals are sampled on the clock edge that samples ADSClow (and ADSP high).
•Master chip enable CE0 blocks ADSP, but not ADSC.

The AS7C331MPFD18A family operates from a core 3.3V power supply. I/Os use a separate power supply that can operate at 2.5V or 3.3V. These devices are available in a 100-pin TQFP package.

AS7C331MPFD18A Maximum Ratings

Parameter	Symbol	Min	Max	Unit
Power supply voltage relative to GND	V_DD, V_DDQ	0.5	+4.6	V
Input voltage relative to GND (input pins)	V_IN	0.5	V_DD+ 0.5	V
Input voltage relative to GND (I/O pins)	V_IN	0.5	V_DDQ+ 0.5	V
Power dissipation	P_d		1.8	W
Short circuit output current	I_OUT		20 mA	mA
Storage temperature	T_stg	65	+150
Temperature under bias	T_bias	65	+135

Note: Stresses greater than those listed in this table 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 outside those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions may affect reliability.

AS7C331MPFD18A Features

• Organization: 1,048,576 x18 bits
• Fast clock speeds to 166MHz
• Fast clock to data access: 3.4/3.8 ns
• Fast OE access time: 3.4/3.8 ns
• Fully synchronous register-to-register operation
• Double-cycle deselect
• Asynchronous output enable control
• Available 100-pin TQFP package
• Individual byte write and global write
• Multiple chip enables for easy expansion
• 3.3 V core power supply
• 2.5 V or 3.3V I/O operation with separate V_DDQ
• Linear or interleaved burst control
• Common data inputs and data outputs
• Snooze mode for reduced power-standby

AS7C331MPFD18A Connection Diagram

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