74F765-1 [NXP]
DRAM dual-ported controllers; DRAM双端口控制器
| 型号： | 74F765-1 |
| 厂家： | 
NXP |
| 描述： | DRAM dual-ported controllers |
| 文件： | 总3页 (文件大小：43K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
INTEGRATED CIRCUITS
74F764-1/74F765-1
DRAM dual-ported controllers
Product specification
IC15 Data Handbook
1992 Aug 10
Philips
Semiconductors
Philips Semiconductors
Product specification
DRAM dual-ported controllers
74F764-1/74F765-1
FEATURES
DESCRIPTION
The 74F764-1/765-1 DRAM Dual-ported Controller is a high-speed
synchronous dual-port arbiter and timing generator that allows two
microprocessors, microcontrollers, or any other memory accessing
device to share the same block of DRAM. The device performs
arbitration, signal timing, address multiplexing, and refresh address
generation, replacing up to 25 discrete devices.
• Allows two microprocessors to access the same bank of dynamic
RAM
• Performs arbitration, signal timing, address multiplexing and
refresh
• 9 Address output pins allow direct control of up to 256K dynamic
RAMs
74F764-1 vs. 74F765-1
The 74F764-1, though functionally and pin-to-pin compatible with
the 74F765-1, differs from the later in that it has an on-chip address
input latch. This is useful in systems that have unlatched or
multiplexed address and data bus.
• External address multiplexing enables control of 1Mbit (or greater)
dynamic RAMs
• Separate refresh clock allows adjustable refresh timing
• 74F764-1 has an on-chip 18-bit address input latch
The specialized outputs eliminate the need for signal terminations in
essentially all applications.
• 74F764-1/765-1 allow control of dynamic RAMs with row access
times down to 40ns
Both devices are available in 40-pin plastic DIP or 44-pin PLCC with
pinouts designed to allow convenient placement of microprocessors,
DRAMs, and other support chips.
• 74F764-1/765-1 output drivers designed for first reflected wave
switching
ORDERING INFORMATION
COMMERCIAL RANGE
DESCRIPTION
V
CC
= 5V±10%,
DRAWING NUMBER
T
amb
= 0°C to 70°C
40-Pin Plastic Dual In-line Package
44-Pin Plastic Leaded Chip Carrier
74F764-1N, 74F765-1N
74F764-1A, 74F765-1A
SOT129–1
SOT187–2
PIN CONFIGURATIONS
N Package
RCP
A1
1
2
3
4
5
40
39
38
37
36
A Package
WG
A10
A2
GNT
CASEN
CASEN
A11
A3
A12 A3 A11 A2 A10 A1 RCPWG GNT
DTACK
6
5
4
3
2
1
44 43 42 41 40
DTACK
7
8
39
38
37
36
35
6
7
35
34
33
32
31
30
29
RAS
MA0
MA1
A12
A4
A4
A13
A5
RAS
MA0
9
8
A13
A5
MA1
10
11
A14
VCC
MA2
GND
9
MA2
GND
10
11
12
A14
12
34
33
32
31
30
29
A6
GND
MA3
MA4
MA5
MA6
VCC
MA3
MA4
MA5
MA6
MA7
A15 13
A7
14
15
16
17
A6
A16
13
14
15
16
17
18
28
27
26
25
24
23
A15
A8
A7
A17
MA7
A16
18 19 20 21 22 23 24 25 26 27 28
A9 A18 NC NC SEL1 REQ2 CP NC MA8
A8
MA8
CP
REQ1 SEL2
A17
A9
SEL2
A18
REQ2
19
20
22
21
SEL1
REQ1
SF00703
SF00685
2
1992 Aug 10
853-0878 07412
Philips Semiconductors
Product specification
DRAM dual-ported controllers
74F764-1/74F765-1
DIP40: plastic dual in-line package; 40 leads (600 mil)
SOT129-1
21
1992 Aug 10
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