UPD4218165L datasheet(6/48 Pages) NEC

Part #	UPD4218165L

Description	3.3 V OPERATION 16 M-BIT DYNAMIC RAM 1 M-WORD BY 16-BIT, EDO, BYTE READ/WRITE MODE

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Manufacturer	NEC [NEC]

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µPD42S18165L, 4218165L

6

Hyper Page Mode (EDO)

The hyper page mode (EDO) is a kind of page mode with enhanced features. The two major features of the

hyper page mode (EDO) are as follows.

1. Data output time is extended.

In the hyper page mode (EDO), the output data is held to the next CAS cycle’s falling edge, instead of the rising

edge. For this reason, valid data output time in the hyper page mode (EDO) is extended compared with the fast

page mode (= data extend function). In the fast page mode, the data output time becomes shorter as the CAS

cycle time becomes shorter. Therefore, in the hyper page mode (EDO), the timing margin in read cycle is larger

than that of the fast page mode even if the CAS cycle time becomes shorter.

2. The CAS cycle time in the hyper page mode (EDO) is shorter than that in the fast page mode.

In the hyper page mode (EDO), due to the data extend function, the CAS cycle time can be shorter than in the

fast page mode if the timing margin is the same.

Taking a device whose tRAC is 60 ns as an example, the CAS cycle time in the fast page mode is 25 ns while that

in the fast page mode is 40 ns.

In the hyper page mode (EDO), read (data out) and write (data in) cycles can be executed repeatedly during one

RAS cycle. The hyper page mode (EDO) allows both read and write operations during one cycle.

The following shows a part of the hyper page mode (EDO) read cycle. Specifications to be observed are described

in the next page.

Hyper Page Mode (EDO) Read Cycle

tHPC

tOEA

tOEZ

tAA

Hi - Z

Row

Col.A

Col.B

Col.C

tOEA

tOLZ

RAS

VIH–

VIL–

CAS

VIH–

VIL–

Address

VIH–

VIL–

VIH–

VIL–

OE

VIH–

VIL–

I/O

VOH–

VOL–

Data out A

Data out B

Data out C

tOEZ

tAA

tCAC

tOEZ

tOEP

tOCH

tCHO

WE

tRAC

tAA

tCAC

tCLZ

tCAC

tCLZ

tWPZ

tDHC

tOFC

tOFR

tWEZ

tOCH

tRRH

tRCH

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