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MSM514256C

262,144-Word x 4-Bit DYNAMIC RAM : FAST PAGE MODE TYPE

Oki Electric Industry 

¡ Semiconductor

MSM514256C/CL

AC Characteristics (1/2)

(VCC = 5 V ±10%, Ta = 0°C to 70°C) Note 1, 2, 3, 4, 5

Parameter

MSM514256 MSM514256 MSM514256 MSM514256

Symbol C/CL-45 C/CL-50 C/CL-60 C/CL-70 Unit Note

Min. Max. Min. Max. Min. Max. Min. Max.

Random Read or Write Cycle Time

tRC 90 — 100 — 120 — 130 — ns

Read Modify Write Cycle Time

tRWC 140 — 150 — 170 — 185 — ns

Fast Page Mode Cycle Time

tPC 34 — 36 — 40 — 45 — ns

Fast Page Mode Read Modify Write

Cycle Time

tPRWC 75 — 77 — 90 — 95 — ns

Access Time from RAS

Access Time from CAS

tRAC — 45 — 50 — 60 — 70 ns 6, 7, 8

tCAC — 14 — 14 — 15 — 20 ns 6, 7

Access Time from Column Address

tAA — 24 — 26 — 30 — 35 ns 6, 8

Access Time from CAS Precharge

tCPA — 28 — 30 — 35 — 40 ns 6

Access Time from OE

tOEA — 14 — 14 — 15 — 20 ns 6

Output Low Impedance Time from CAS tCLZ 0 — 0 — 0 — 0 — ns 6

CAS to Data Output Buffer Turn-off Delay Time tOFF 0 10 0 10 0 10 0 10 ns 9

OE to Data Output Buffer Turn-off Delay Time tOEZ 0 10 0 10 0 10 0 10 ns 9

Transition Time

tT 3 50 3 50 3 50 3 50 ns 3

Refresh Period

tREF — 8 — 8 — 8 — 8 ms

Refresh Period (L-version)

tREF — 64 — 64 — 64 — 64 ms

RAS Precharge Time

tRP 35 — 40 — 50 — 50 — ns

RAS Pulse Width

tRAS 45 10,000 50 10,000 60 10,000 70 10,000 ns

RAS Pulse Width (Fast Page Mode)

tRASP 45 100,000 50 100,000 60 100,000 70 100,000 ns

RAS Hold Time

tRSH 14 — 14 — 15 — 20 — ns

RAS Hold Time referenced to OE

tROH 10 — 10 — 10 — 10 — ns

CAS Precharge Time (Fast Page Mode)

tCP 10 — 10 — 10 — 10 — ns

CAS Pulse Width

tCAS 14 10,000 14 10,000 15 10,000 20 10,000 ns

CAS Hold Time

tCSH 45 — 50 — 60 — 70 — ns

CAS to RAS Precharge Time

tCRP 5 — 5 — 5 — 5 — ns

RAS Hold Time from CAS Precharge

tRHCP 28 — 30 — 35 — 40 — ns

RAS to CAS Delay Time

tRCD 17 31 18 36 20 45 20 50 ns 7

RAS to Column Address Delay Time

tRAD 12 21 13 24 15 30 15 35 ns 8

Row Address Set-up Time

tASR 0 — 0 — 0 — 0 — ns

Row Address Hold Time

tRAH 7 — 8 — 10 — 10 — ns

Column Address Set-up Time

tASC 0 — 0 — 0 — 0 — ns

Column Address Hold Time

Column Address Hold Time from RAS

Column Address to RAS Lead Time

tCAH 12 — 13 — 15 — 15 — ns

tAR 35 — 40 — 50 — 55 — ns

tRAL 24 — 26 — 30 — 35 — ns

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