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AS5SS256K18DQ-8L/IT PDF预览

AS5SS256K18DQ-8L/IT

更新时间: 2024-11-08 03:23:15
品牌 Logo 应用领域
MICROSS 静态存储器
页数 文件大小 规格书
15页 223K
描述
Standard SRAM

AS5SS256K18DQ-8L/IT 数据手册

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SSRAM  
AS5SS256K18  
256K x 18 SSRAM  
Synchronous Burst SRAM,  
Flow-Through  
FEATURES  
• Fast access times: 8, 10, and 15ns  
• Fast clock speed: 113, 100, and 66 MHz  
• Fast clock and OE\ access times  
PIN ASSIGNMENT  
(Top View)  
100-pin TQFP  
100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81  
NC  
NC  
NC  
DDQ  
VSS  
NC  
1
2
3
4
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
SA  
NC  
NC  
80  
79  
78  
77  
76  
75  
74  
73  
72  
71  
70  
69  
68  
67  
66  
65  
64  
63  
62  
61  
60  
59  
58  
57  
56  
55  
54  
53  
52  
51  
• Single +3.3V ± 5% power supply (VDD  
)
V
V
DDQ  
• SNOOZE MODE for reduced-power standby  
• Common data inputs and data outputs  
• Individual BYTE WRTIE control and GLOBAL WRITE  
• Three chip enables for simple depth expansion and address  
pipelining  
• Clock-controlled and registered addresses, data I/Os and  
control signals  
• Interally self-timed WRITE cycle  
• Burst control pin (interleaved or linear burst)  
• Automatic power-down  
• Low capacitive bus loading  
• Available in Industrial, Enhanced, and Mil-Temperature  
Operating Ranges  
• TQFP in copper lead frame for superior thermal  
performance  
• RoHs compliant options available  
VSS  
NC  
DQPa  
DQa  
DQa  
VSS  
NC  
DQb  
DQb  
VSS  
VDD  
Q
DQb  
DQb  
NC  
VDD  
NC  
VDD  
Q
DQa  
DQa  
VSS  
NC  
VDD  
ZZ  
VSS  
DQb  
DQb 19  
DDQ 20  
VSS 21  
DQb 22  
DQb 23  
DQPb 24  
NC 25  
DQa  
DQa  
V
V
DDQ  
VSS  
DQa  
DQa  
NC  
NC  
VSS  
VDD  
NC  
NC  
NC  
VSS 26  
VDD  
Q
27  
Q
NC 28  
NC 29  
NC 30  
31 32 33 34 35 36 37 38 39 40 41 42 43 44 4546 47 48 49 50  
OPTIONS  
• Timing  
MARKING  
7.5ns/8ns/113 MHz  
8.5ns/10ns/100 MHz  
10ns/15ns/66 MHz  
• Packages  
-8  
-9  
-10  
**pins 42,43 reserved for future address expansion for 8Mb, 16Mb densities.  
CE2), burst control inputs (ADSC\,ADSP\,ADV\), byte write enables  
(BWx\) and global write (GW\).  
TQFP  
DQ No. 1001  
DQC  
DQCR  
Asynchronous inputs include the output enable (OE\), clock (CLK)  
and snooze enable (ZZ). There is also a burst mode input (MODE)  
that selects between interleaved and linear burst modes. The data-out  
(Q), enabled by OE\, is also asynchronous. WRITE cycles can be from  
one to two bytes wide, as controlled by the write control inputs.  
Burst operation can be initiated with either address status processor  
(ADSP\) or address status controller (ADSC\) inputs. Subsequent  
burst addresses can be internally generated as controlled by the burst  
advance input (ADV\).  
TQFP - Copper Lead Frame  
TQFP - RoHS Compliant  
• Operating Temperature Ranges:  
- Military -55oC to +125oC  
- Enhanced -45oC to +105oC  
- Industrial -45oC to +85oC  
/IT  
/ET  
/XT  
Address and write control are registered on-chip to simplify WRITE  
cycles. This allows self-timed WRITE cycles. Individual byte enables  
allow individual bytes to be written. During WRITE cycles on this  
x18 device BWa\ controls DQa pins and DQPa; BWb\ controls DQb  
pins and DQPb. GW\ LOW causes all bytes to be written. Parity bits  
are available on this device.  
GENERAL DESCRIPTION  
The Micross Components Synchronous Burst SRAM family  
employs high-speed, low power CMOS designs that are fabricated  
using an advanced CMOS process.  
The 4Mb Synchronous Burst SRAMs integrate a 256K x 18, SRAM  
core with advanced synchronous peripheral circuitry and a 2-bit burst  
counter. All synchronous inputs pass through registers controlled by  
The 4Mb Synchronous Burst SRAMs operate from a +3.3V VDD  
a positive-edge-triggered single clock input (CLK). The synchronous power supply, and all inputs and outputs are TTL-compatible. The  
inputs include all addresses, all data inputs, active LOW chip enable device is ideally suited for 486, Pentium®, and PowerPC systems and  
(CE\), two additional chip enables for easy depth expansion (CE2\, those systems that benet from a wide synchronous data bus.  
Micross Components reserves the right to change products or specications without notice.  
AS5SS256K18  
Rev. 2.4 09/11  
1

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