NTE21256 NTE ELECTRONICS, NTE21256 Datasheet - Page 4

• Manufacturer Part Number: NTE21256
• Description: IC, DRAM, 256KBIT, DIP-16
• Manufacturer: NTE ELECTRONICS

Specifications of NTE21256

• Memory Type: DRAM - NMOS
• Memory Configuration: 256 X 1
• Access Time: 150ns
• Page Size: 256Kbit
• Memory Case Style: DIP
• No. Of Pins: 16
• Operating Temperature Range: 0°C To +70°C
• Supply Voltage: 5V
• Mounting Type: Through Hole

AC Characteristics: (T
Note 9. V
Note10. An initial pause of 200 s is required after power–up followed by a minimum of eight initialization
Note 11. The time parameters specified here are valid for a transition time of t
Note12. The specification for t
Note13. Measured with a load equivalent to two TTL loads and 100pf.
Note14. Assumes that t
Note15. Assumes that t
Note16. Operation within the t
Note17. t
Note18. Either t
Note19. t
Random Read or Write Cycle Time
Read–Modify–Write Cycle Time
Access Time from RAS
Access Time from CAS
RAS Pulse Width
CAS Pulse Width
Refresh Period
RAS Precharge Time
CAS to RAS Precharge Time
RAS to CAS Delay Time
RAS Hold Time
CAS Hold Time
Row Address Setup Time
Row Address Hold Time
Column Address Setup Time
Column Address Hold Time
Column Address Hold Time referenced to RAS
Transition Time (Rise and Fall)
Read Command Setup Time
Read Command Hold Time referenced to CAS
Read Command Hold Time referenced to RAS
Output Buffer Turn–Off Delay
are measured between V
cycles prior to normal operation.
to indicate cycle time at which proper operation over full temperature range
(0 C
shown in this table, t
cified as a reference point only. If t
access time is controlled exclusively by t
referenced to output voltage levels.
RCD
OFF
IH
and V
(Max) defines the time at which the output achieves the open circuit condition and is not
+ t
T
RRH
CAH
A
IL
Parameter
or t
are reference levels to measure timing of input signals. Also, transition times
+70 C) is assured.
otherwise specified)
t
AR
RCD
RCH
RCD
A
= 0 to +70 C, V
Min, t
must be satisfied for a read cycle.
RAC
RCD
t
t
RC
RCD
RCD
RCD
(Min), t
will increase by the amount that t
IH
(Max) limit ensures that t
(Max). If t
(Max).
and V
+ t
DH
RWC
IL
CC
.
RCD
t
RCD
DHR
(Min), and page–mode cycle time (t
= 5V 10%, Note 9, Note 10, Note 11 unless
Symbol
is greater than the specified t
is greater than the maximum recommended value
CAC
Min, t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
RWC
t
RAC
CAC
t
CRP
RCD
RSH
CSH
RAH
CAH
t
RCS
RCH
RRH
RAS
CAS
REF
ASR
ASC
OFF
RC
RP
AR
t
T
.
RCD
Note 12
Note 12
Notes 13, Note 14
Notes 13, Note 15
Note 16
Note 17
Note 9
Note 18
Note 18
Note 19
RAC
Test Conditions
+ t
WCH
(Max) can be met. t
RCD
t
WCR
exceeds the value shown.
T
= 5ns for the input signals
Min.
Min
260
310
150
100
150
105
RCD
75
30
75
20
30
10
–
–
–
0
0
0
3
0
0
0
PC
RCD
(Max) limit, then
Typ
) are only used
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
(Max) is spe-
Max Unit
150
10
75
75
50
40
–
–
–
4
–
–
–
–
–
–
–
–
–
–
–
–
4
ms
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns