MSM548263 datasheet(1/40 Pages) OKI

Part #	MSM548263

Description	262,144-Word x 8-Bit Multiport DRAM

PDF	40 Pages

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Manufacturer	OKI [OKI electronic componets]

Direct Link	http://www.oki.com

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¡ Semiconductor

MSM548263

1/40

¡ Semiconductor

MSM548263

262,144-Word

¥ 8-Bit Multiport DRAM

DESCRIPTION

The MSM548263 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 MSM548263

features block write, flash write functions and extended page mode on the RAM port and a split

data transfer capability, programmable stops 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 : 256K word ¥ 8 bits

SAM : 512 word ¥ 8 bits

• Extended page mode

• Write per bit

• Persistent write per bit

• Masked flash write

• Masked block write

• Package options:

40-pin 400 mil plastic SOJ

(SOJ40-P-400-1.27)

(Product : MSM548263-xxJS)

44/40-pin 400 mil plastic TSOP (Type II)(TSOPII44/40-P-400-0.80-K)(Product : MSM548263-xxTS-K)

xx indicates speed rank.

PRODUCT FAMILY

• RAS only refresh

• CAS before RAS refresh

• Hidden refresh

• Serial read/write

• 512 tap location

• Programmable stops

• Bidirectional data transfer

• Split transfer

• Masked write transfer

• Refresh: 512 cycles/8 ms

Access Time

Cycle Time

Power Dissipation

RAM

Operating

Standby

SAM

60 ns

120 ns

140 mA

8 mA

17 ns

22 ns

70 ns

140 ns

130 mA

8 mA

17 ns

22 ns

80 ns

150 ns

120 mA

8 mA

20 ns

25 ns

Family

MSM548263-60

MSM548263-70

MSM548263-80

E2L0017-17-Y1

This version: Jan. 1998

Previous version: Dec. 1996

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