參數(shù)資料
型號(hào): TDA7500ATR
廠商: STMICROELECTRONICS
元件分類: 消費(fèi)家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PQFP100
封裝: ROHS COMPLIANT, TQFP-100
文件頁(yè)數(shù): 17/41頁(yè)
文件大小: 431K
代理商: TDA7500ATR
TDA7500A
24/40
EXTERNAL MEMORY INTERFACE (EMI) DRAM MODE
Note: 1. n is the number of successive accesses. n = 2, 3, 4, or 6.
DRAM Refresh Timing
Note: 1. Happens when a Refresh Cycle is followed by an Access Cycle.
Characteristics
Timing
Mode
40MHz
Unit
Min.
Max.
Page Mode Cycle Time
slow
fast
10075
----
ns
RAS or RD Assertion to Data Valid
slow
fast
--
159
109
ns
CAS Assertion to Data Valid
slow
fast
--
65
40
ns
Column Address Valid to Data Valid
slow
fast
--
80
55
ns
CAS Assertion to Data Active
0
--
ns
RAS Assertion Pulse Width (Note 1)
(Page Mode Access Only)
slow
fast
264
189
--
ns
RAS Assertion Pulse Width (Single Access Only)
slow
fast
164
114
--
ns
RAS or CAS Negation to RAS Assertion
slow
fast
120
70
--
ns
CAS Assertion Pulse Width
slow
fast
65
40
--
ns
Last CAS Assertion to RAS Negation (Page Mode Access Only)
slow
fast
60
35
--
ns
Characteristics
Timing
Mode
40MHz
Unit
Min.
Max.
RAS Negation to RAS Assertion
slow
fast
143
93
--
ns
CAS Negation to CAS Assertion
slow
fast
118
68
--
ns
Refresh Cycle Time
slow
fast
325
225
--
ns
RAS Assertion Pulse Width
slowf
ast
166
116
--
ns
RAS Negation to RAS Assertion for Refresh Cycle (Note 1)
slow
fast
120
70
--
ns
CAS Assertion to RAS Assertion on Refresh Cycle
18
--
ns
RAS Assertion to CAS Negation on Refresh Cycle
slow
fast
160
110
--
ns
RAS Negation to CAS Assertion on a Refresh Cycle
slow
fast
114
64
--
ns
CAS Negation to Data Not Valid
0
--
ns
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