DP8421AV-20 National Semiconductor, DP8421AV-20 Datasheet - Page 15
DP8421AV-20
Manufacturer Part Number
DP8421AV-20
Description
IC CTRLR/DVR CMOS PROGRAM 68PLCC
Manufacturer
National Semiconductor
Datasheet
1.DP8420AV-25.pdf
(58 pages)
Specifications of DP8421AV-20
Controller Type
Dynamic RAM (DRAM)
Voltage - Supply
4.5 V ~ 5.5 V
Operating Temperature
0°C ~ 70°C
Package / Case
68-PLCC
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
*DP8421AV-20
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
DP8421AV-20
Manufacturer:
NSC
Quantity:
5 510
Company:
Part Number:
DP8421AV-20
Manufacturer:
Texas Instruments
Quantity:
10 000
Part Number:
DP8421AV-20
Manufacturer:
NS/国半
Quantity:
20 000
4 0 Port A Access Modes
4 3 EXTENDING CAS WITH EITHER ACCESS MODE
In both access modes once AREQ is negated RAS and
DTACK if programmed will be negated If ECAS0 was as-
serted (0) during programming CAS (CASs) will be negated
FIGURE 9b Access Mode 1 Extending CAS
FIGURE 9a Access Mode 0 Extending CAS
(Continued)
15
with AREQ If ECAS0 was negated (1) during programming
CAS (CASs) will continue to be asserted after RAS has
been negated given that the appropriate ECAS inputs are
asserted This allows a DRAM to have data present on the
data out bus while gaining RAS precharge time
TL F 8588 – 61
TL F 8588 – 63