Multiport DRAM. MSM548262 Datasheet

MSM548262 DRAM. Datasheet pdf. Equivalent

Part MSM548262
Description Multiport DRAM
Feature E2L0016-17-Y1 www.DataSheet4U.com ¡ Semiconductor ¡ Semiconductor MSM548262 262,144-Word ¥ 8-Bit Mu.
Manufacture OKI electronic
Datasheet
Download MSM548262 Datasheet



MSM548262
E2L0016-17-Y1
www.DataSheet4U.com
¡¡SemicondSucetormiconductor
MSM548262
262,144-Word ¥ 8-Bit Multiport DRAM
This versionM: SJaMn.5149892862
Previous version: Dec. 1996
DESCRIPTION
The MSM548262 is a 2-Mbit CMOS multiport DRAM composed of a 262,144-word by 8-bit
dynamic RAM, and a 512-word by 8-bit SAM. Its RAM and SAM operate independently and
asynchronously.
It supports three types of operations: 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 MSM548262
features block write, 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%
RAS only refresh
• Full TTL compatibility
CAS before RAS refresh
• Multiport organization
• Hidden refresh
RAM : 256K word ¥ 8 bits
• Serial read/write
SAM : 512 word ¥ 8 bits
• 512 tap location
• Fast page mode
• Bidirectional data transfer
• Write per bit
• Split transfer
• Masked flash write
• Masked write transfer
• Masked block write
• Refresh: 512 cycles/8 ms
• Package options:
40-pin 400 mil plastic SOJ
(SOJ40-P-400-1.27)
(Product : MSM548262-xxJS)
44/40-pin 400 mil plastic TSOP (Type II)(TSOPII44/40-P-400-0.80-K)(Product : MSM548262-xxTS-K)
xx indicates speed rank.
PRODUCT FAMILY
Family
MSM548262-60
MSM548262-70
MSM548262-80
Access Time
RAM SAM
60 ns 17 ns
70 ns 17 ns
80 ns 20 ns
Cycle Time
RAM SAM
120 ns 22 ns
140 ns 22 ns
150 ns 25 ns
Power Dissipation
Operating
Standby
140 mA
8 mA
130 mA
8 mA
120 mA
8 mA
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MSM548262
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PIN CONFIGURATION (TOP VIEW)
VCC 1
40 VSS
SC 2
39 SDQ8
SDQ1 3
38 SDQ7
SDQ2 4
37 SDQ6
SDQ3 5
SDQ4 6
TRG 7
36 SDQ5
35 SE
34 DQ8
DQ1 8
33 DQ7
DQ2 9
32 DQ6
DQ3 10
31 DQ5
DQ4 11
VSS 12
WE 13
RAS 14
30 VSS
29 DSF
28 NC
27 CAS
A8 15
26 QSF
A7 16
25 A0
A6 17
24 A1
A5 18
23 A2
A4 19
22 A3
VCC 20
21 VSS
VCC 1
SC 2
SDQ1 3
SDQ2 4
SDQ3 5
SDQ4 6
TRG 7
DQ1 8
DQ2 9
DQ3 10
MSM548262
44 VSS
43 SDQ8
42 SDQ7
41 SDQ6
40 SDQ5
39 SE
38 DQ8
37 DQ7
36 DQ6
35 DQ5
DQ4 13
VSS 14
WE 15
RAS 16
A8 17
A7 18
A6 19
A5 20
A4 21
VCC 22
32 VSS
31 DSF
30 NC
29 CAS
28 QSF
27 A0
26 A1
25 A2
24 A3
23 VSS
44/40-Pin Plastic TSOP (II)
(K Type)
40-Pin Plastic SOJ
Pin Name
A0 - A8
DQ1 - DQ8
SDQ1 - SDQ8
RAS
CAS
WE
TRG
Function
Address Input
RAM Inputs/Outputs
SAM Inputs/Outputs
Row Address Strobe
Column Address Strobe
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.
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