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DP8440-40

microCMOS Programmable 16/64 Mbit Dynamic RAM Controller/Driver

厂商名称:National Semiconductor(TI )

厂商官网:http://www.ti.com

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DP8440-40 DP8440-25 DP8441-40 DP8441-25 microCMOS Programmable 16 64 Mbit
Dynamic RAM Controller Driver
February 1995
DP8440-40 DP8440-25 DP8441-40 DP8441-25
microCMOS Programmable 16 64 Mbit
Dynamic RAM Controller Driver
General Description
The DP8440 41 Dynamic RAM Controllers provide an easy
interface between dynamic RAM arrays and 8- 16- 32- and
64-bit microprocessors The DP8440 41 DRAM Controllers
generate all necessary control and timing signals to suc-
cessfully interface and design dynamic memory systems
With significant enhancements over the DP8420 21 22
predecessors the DP8440 41 are suitable for high perform-
ance memory systems These controllers support page and
burst accesses for fast page static column and nibble
DRAMs Refreshes and accesses are arbitrated on chip
RAS low time during refresh and RAS precharge time are
guaranteed by these controllers Separate precharge coun-
ters for each RAS output avoid delayed back to back ac-
cesses due to precharge when using memory interleaving
Programmable features make the DP8440 41 DRAM Con-
trollers flexible enough to fit many memory systems
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
40 MHz and 25 MHz operation
Page detection
Automatic CPU burst accesses
Support 1 4 16 64 Mbits DRAMs
High capacitance drivers for RAS CAS WE and Q out-
puts
Support for fast page static column and nibble mode
DRAMs
High precision PLL based delay line
Byte enable for word size up to 32 bits on the DP8440
or 64 bits on the DP8441
Automatic Internal Refresh
Staggered RAS-Only refresh
Burst and CAS-before-RAS refresh
Error scrubbing during refresh
TRI-STATE outputs
Easy interface to all major microprocessors
Block Diagram
TL F 11718 – 1
FIGURE 1
TRI-STATE is a registered trademark of National Semiconductor Corporation
C
1995 National Semiconductor Corporation
TL F 11718
RRD-B30M75 Printed in U S A
DRAM
Controller
DP8440V-40
DP8440VLJ-40
DP8440VLJ-25
DP8441VLJ-40
DP8441VLJ-25
Maximum Clock
Frequency
40 MHz
40 MHz
25 MHz
40 MHz
25 MHz
Package
Type
84-Pin PLCC
100-Pin PQFP
100-Pin PQFP
100-Pin PQFP
100-Pin PQFP
Bus Width
Supporting
8 16 32
8 16 32
8 16 32
8 16 32 64
8 16 32 64
Largest DRAM
Possible
16 Mbits
16 Mbits
16 Mbits
64 Mbits
64 Mbits
Table of Contents
1 0 CONNECTION DIAGRAMS
2 0 FUNCTIONAL INTRODUCTION
3 0 SIGNAL DESCRIPTION
3 1 Address and Control Signals
3 2 DRAM Control Signals
3 3 Refresh Signals
3 4 Reset and Programming Signals
3 5 Clock Inputs
3 6 Power Signals and Capacitor Input
4 0 PROGRAMMING AND RESETTING
4 1 Reset
4 2 Programming Sequence
4 3 Programming Selection Bits
5 0 ACCESS MODES
5 1 Opening Access
5 2 Normal Mode
5 3 Page Mode
5 4 Burst Access
5 5 Inner Page Burst Access
6 0 REFRESH MODES
6 1 Auto-Internal Refresh
6 2 Externally Controlled Refresh
6 3 Error Scrubbing during Refresh
6 4 Extending Refresh
6 5 Refresh Types
7 0 WAIT SUPPORT
7 1 DTACK During Opening Access
7 2 DTACK During Page Access
7 3 DTACK During Burst Access
7 4 Next Address or Early DTACK Support
8 0 ABSOLUTE MAXIMUM RATINGS
9 0 DC ELECTRICAL CHARACTERISTICS
10 0 LOAD CAPACITANCE
11 0 AC TIMING PARAMETERS
12 0 AC TIMING WAVEFORMS
CLK and DECLK Timing
Refresh Timing
Refresh and Access Timing
Programming and Initialization Period Timing
Normal Mode Access Timing
Page Mode Access Timing
Burst Mode Access Timing
13 0 ERRATA
14 0 PHYSICAL DIMENSIONS
2
1 0 Connection Diagrams
TL F 11718 – 2
Top View
FIGURE 2
Order Number DP8441VLJ-40 (40 MHz Operation) DP8441VLJ-25 (25 MHz Operation)
See NS Package Number VLJ100A
3
1 0 Connection Diagrams
(Continued)
TL F 11718 – 38
Top View
FIGURE 3
Order Number DP8440VLJ-40 (40 MHz Operation) DP8440VLJ-25 (25 MHz Operation)
See NS Package Number VLJ100A
4
1 0 Connection Diagrams
(Continued)
TL F 11718 – 3
Top View
FIGURE 4
Order Number DP8440V-40 (40 MHz Operation)
See NS Package Number V84A
5
查看更多>
参数对比
与DP8440-40相近的元器件有:DP8440V-40、DP8440VLJ-25、DP8440VLJ-40、DP8441VLJ-25、DP8441VLJ-40。描述及对比如下:
型号 DP8440-40 DP8440V-40 DP8440VLJ-25 DP8440VLJ-40 DP8441VLJ-25 DP8441VLJ-40
描述 microCMOS Programmable 16/64 Mbit Dynamic RAM Controller/Driver microCMOS Programmable 16/64 Mbit Dynamic RAM Controller/Driver microCMOS Programmable 16/64 Mbit Dynamic RAM Controller/Driver microCMOS Programmable 16/64 Mbit Dynamic RAM Controller/Driver microCMOS Programmable 16/64 Mbit Dynamic RAM Controller/Driver microCMOS Programmable 16/64 Mbit Dynamic RAM Controller/Driver
是否Rohs认证 - 不符合 不符合 不符合 不符合 不符合
包装说明 - QCCJ, LDCC84,1.2SQ QFP, QFP100,.7X.9 QFP, QFP100,.7X.9 QFP, QFP100,.7X.9 QFP, QFP100,.7X.9
Reach Compliance Code - unknow unknow unknow unknow unknow
地址总线宽度 - 24 24 24 26 26
边界扫描 - NO NO NO NO NO
最大时钟频率 - 40 MHz 25 MHz 40 MHz 25 MHz 40 MHz
JESD-30 代码 - S-PQCC-J84 R-PQFP-G100 R-PQFP-G100 R-PQFP-G100 R-PQFP-G100
JESD-609代码 - e0 e0 e0 e0 e0
长度 - 29.3116 mm 20 mm 20 mm 20 mm 20 mm
低功率模式 - NO NO NO NO NO
内存组织 - 16M X 1 16M X 1 16M X 1 64M X 1 64M X 1
区块数量 - 4 4 4 4 4
端子数量 - 84 100 100 100 100
最高工作温度 - 70 °C 70 °C 70 °C 70 °C 70 °C
封装主体材料 - PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
封装代码 - QCCJ QFP QFP QFP QFP
封装等效代码 - LDCC84,1.2SQ QFP100,.7X.9 QFP100,.7X.9 QFP100,.7X.9 QFP100,.7X.9
封装形状 - SQUARE RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR
封装形式 - CHIP CARRIER FLATPACK FLATPACK FLATPACK FLATPACK
峰值回流温度(摄氏度) - NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED
电源 - 5 V 5 V 5 V 5 V 5 V
认证状态 - Not Qualified Not Qualified Not Qualified Not Qualified Not Qualified
座面最大高度 - 5.08 mm 3 mm 3 mm 3 mm 3 mm
最大压摆率 - 260 mA 260 mA 260 mA 260 mA 260 mA
最大供电电压 - 5.25 V 5.25 V 5.25 V 5.25 V 5.25 V
最小供电电压 - 4.75 V 4.75 V 4.75 V 4.75 V 4.75 V
标称供电电压 - 5 V 5 V 5 V 5 V 5 V
表面贴装 - YES YES YES YES YES
技术 - CMOS CMOS CMOS CMOS CMOS
温度等级 - COMMERCIAL COMMERCIAL COMMERCIAL COMMERCIAL COMMERCIAL
端子面层 - Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb)
端子形式 - J BEND GULL WING GULL WING GULL WING GULL WING
端子节距 - 1.27 mm 0.65 mm 0.65 mm 0.65 mm 0.65 mm
端子位置 - QUAD QUAD QUAD QUAD QUAD
处于峰值回流温度下的最长时间 - NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED
宽度 - 29.3116 mm 14 mm 14 mm 14 mm 14 mm
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