Multiport DRAM. MSM54C865 Datasheet

MSM54C865 DRAM. Datasheet pdf. Equivalent

Part MSM54C865
Description Multiport DRAM
Feature .
Manufacture OKI electronic
Datasheet
Download MSM54C865 Datasheet




MSM54C865
E2L0011-17-Y1
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MSM54C865
65,536-Word ¥ 8-Bit Multiport DRAM
This versionM: SJMan5. 41C998865
Previous version: Dec. 1996
DESCRIPTION
The MSM54C865 is a 512Kbit CMOS multiport DRAM composed of a 65,536-word by 8-bit
dynamic RAM and a 256-word by 8-bit SAM. Its RAM and SAM operate independently and
asynchronously.
The MSM54C865 supports three types of operaton: random access to RAM port, high speed serial
access to SAM port and bidirectional transfer of data between any selected row in the RAM port
and the SAM port. In addition to the conventional multiport DRAM operating modes, the
MSM54C865 features the block write and flash write functions on the RAM port and a split data
transfer capability on the SAM port. The SAM port requires no refresh operation because it uses
static CMOS flip-flops.
FEATURES
• Single power supply: 5 V ±10%
• Full TTL compatibility
• Multiport organization
RAM : 64K word ¥ 8 bits
SAM : 256 word ¥ 8 bits
• Fast page mode
• Write per bit
• Masked flash write
• Masked block write
RAS only refresh
CAS before RAS refresh
• Hidden refresh
• Serial read/write
• 256 tap location
• Bidirectional data transfer
• Split transfer
• Masked write transfer
• Refresh :256 cycles/4 ms
• Package options:
40-pin 475 mil plastic ZIP (ZIP40-P-475-1.27)
40-pin 400 mil plastic SOJ (SOJ40-P-400-1.27)
(Product : MSM54C865-xxZS)
(Product : MSM54C865-xxJS)
xx indicates speed rank.
PRODUCT FAMILY
Family
MSM54C865-70
MSM54C865-80
MSM54C865-10
Access Time
RAM SAM
70 ns 25 ns
80 ns 25 ns
100 ns 25 ns
Cycle Time
RAM SAM
140 ns 30 ns
150 ns 30 ns
180 ns 30 ns
Power Dissipation
Operating Standby
120 mA
8 mA
110 mA
8 mA
100 mA
8 mA
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MSM54C865
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PIN CONFIGURATION (TOP VIEW)
W5/IO5 1
W7/IO7 3
SE 5
SIO6 7
SIO8 9
SC 11
SIO2 13
SIO4 15
W1/IO1 17
W3/IO3 19
W4/IO4 21
WB/WE 23
NC 25
VSS2 27
A5 29
NC 31
A7 33
A2 35
A0 37
CAS 39
2 W6/IO6
4 W8/IO8
6 SIO5
8 SIO7
10 VSS1
12 SIO1
14 SIO3
16 DT/OE
18 W2/IO2
20 VSS3
22 VCC1
24 RAS
26 A6
28 NC
30 A4
32 VCC2
34 A3
36 A1
38 QSF
40 DSF
40-Pin Plastic ZIP
MSM54C865
SC 1
SIO1 2
SIO2 3
SIO3 4
SIO4 5
DT/OE 6
W1/IO1 7
W2/IO2 8
40 VSS1
39 SIO8
38 SIO7
37 SIO6
36 SIO5
35 SE
34 W8/IO8
33 W7/IO7
W3/IO3 9
32 W6/IO6
W4/IO4 10
31 W5/IO5
VCC1 11
WB/WE 12
30 VSS2
29 DSF
NC 13
RAS 14
28 NC
27 CAS
NC 15
26 QSF
NC 16
25 A0
A6 17
24 A1
A5 18
23 A2
A4 19
22 A3
VCC2 20
21 A7
40-Pin Plastic SOJ
Pin Name
A0 - A7
W1/IO1 - W8/IO8
SIO1 - SIO8
RAS
CAS
WB/WE
DT/OE
Function
Address Input
RAM Inputs/Outputs
SAM Inputs/Outputs
Row Address Strobe
Column Address Strobe
Write per Bit/Write Enable
Transfer/Output Enable
Pin Name
SC
SE
DSF
QSF
VCC
VSS
NC
Function
Serial Clock
SAM Port Enable
Special Function Input
Special Function Output
Power Supply (5 V)
Ground (0 V)
No Connection
Note : The same power supply voltage must be provided to every VCC pin, and the same GND
voltage level must be provided to every VSS pin.
2/44







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