®
IS41C16256
IS41LV16256
256K x 16 (4-MBIT) DYNAMIC RAM
WITH EDO PAGE MODE
ISSI
NOVEMBER 2005
FEATURES
DESCRIPTION
• TTL compatible inputs and outputs
TheISSI ISꢁ1C1ꢂ25ꢂandISꢁ1LV1ꢂ25ꢂare2ꢂ2,1ꢁꢁx1ꢂ-bit
high-performanceCMOSDynamicRandomAccessMemory. Both
productsofferacceleratedcycleaccessEDOPageMode. EDO
PageModeallows512randomaccesseswithinasinglerowwith
accesscycletimeasshortas10nsper1ꢂ-bitword.TheByteWrite
control, of upper and lower byte, makes the ISꢁ1C1ꢂ25ꢂ and
ISꢁ1LV1ꢂ25ꢂidealforusein1ꢂand32-bitwidedatabussystems.
• Refresh Interval: 512 cycles/8 ms
• Refresh Mode : RAS-Only, CAS-before-RAS (CBR),
andHidden
• JEDECstandardpinout
• Singlepowersupply
5V 10ꢀ (ISꢁ1C1ꢂ25ꢂ)
ThesefeaturesmaketheISꢁ1C1ꢂ25ꢂandISꢁ1LV1ꢂ2ꢂ ideally
suited for high band-width graphics, digital signal processing,
high-performancecomputingsystems,andperipheralapplications.
3.3V 10ꢀ (ISꢁ1LV1ꢂ25ꢂ)
• Byte Write and Byte Read operation via two CAS
• Extended Temperature Range -30oC to 85oC
• Industrial Temperature Range -ꢁ0oC to 85oC
The ISꢁ1C1ꢂ25ꢂ and IS41LV16256 are packaged in ꢁ0-pin
ꢁ00-mil SOJ and TSOP (Type II).
KEY TIMING PARAMETERS
Parameter
-25
-35
-50
-60
Unit
(5V only)
Max. RAS Access Time (tRAC)
25
35
10
18
12
ꢂ0
50
1ꢁ
25
20
90
ꢂ0
15
ns
ns
ns
ns
ns
Max. CAS Access Time (tCAC)
10
12
10
ꢁ5
Max. Column Address Access Time (tAA)
Min. EDO Page Mode Cycle Time (tPC)
Min. Read/Write Cycle Time (tRC)
30
25
110
PIN CONFIGURATIONS
40-Pin TSOP (Type II)
40-Pin SOJ
VCC
I/O0
I/O1
I/O2
I/O3
VCC
I/O4
I/O5
I/O6
I/O7
1
40
39
38
37
36
35
34
33
32
31
GND
I/O15
I/O14
I/O13
I/O12
GND
I/O11
I/O10
I/O9
VCC
I/O0
I/O1
I/O2
I/O3
VCC
I/O4
I/O5
I/O6
I/O7
NC
1
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
GND
2
2
I/O15
I/O14
I/O13
I/O12
GND
I/O11
I/O10
I/O9
I/O8
NC
PIN DESCRIPTIONS
3
3
4
4
A0-A8 Address Inputs
5
5
6
I/O0-15 Data Inputs/Outputs
6
7
7
WE
Write Enable
8
8
9
OE
Output Enable
9
10
I/O8
10
11
12
13
14
15
16
17
18
19
20
RAS
UCAS
LCAS
Vcc
Row Address Strobe
UpperColumnAddressStrobe
LowerColumnAddressStrobe
Power
NC
NC
WE
RAS
NC
A0
11
12
13
14
15
16
17
18
19
20
30
29
28
27
26
25
24
23
22
21
NC
NC
LCAS
UCAS
OE
LCAS
UCAS
OE
WE
RAS
NC
A8
A8
A0
A7
A7
GND
NC
Ground
A1
A6
A1
A6
No Connection
A2
A5
A2
A5
A3
A4
A3
A4
VCC
GND
VCC
GND
Copyright © 2005 Integrated Silicon Solution, Inc. All rights reserved. ISSI reserves the right to make changes to this specification and its products at any time
without notice. ISSI assumes no liability arising out of the application or use of any information, products or services described herein. Customers are advised to
obtain the latest version of this device specification before relying on any published information and before placing orders for products.
Integrated Silicon Solution, Inc. — 1-800-379-4774
1
Rev. K
10/28/05