®
IS42S16400A
ISSI
1 Meg Bits x 16 Bits x 4 Banks (64-MBIT)
SYNCHRONOUS DYNAMIC RAM
April 2003
FEATURES
OVERVIEW
ISSI's64MbSynchronousDRAMIS42S16400Aisorganized
as 1,048,576 bits x 16-bit x 4-bank for improved
performance.ThesynchronousDRAMsachievehigh-speed
data transfer using pipeline architecture. All inputs and
outputs signals refer to the rising edge of the clock input.
• Clock frequency:166, 133, 100 MHz
• Fully synchronous; all signals referenced to a
positive clock edge
• Internal bank for hiding row access/precharge
• Single 3.3V power supply
• LVTTL interface
PIN CONFIGURATIONS
54-Pin TSOP (Type II)
• Programmable burst length
– (1, 2, 4, 8, full page)
VCC
I/O0
VCCQ
I/O1
I/O2
GNDQ
I/O3
I/O4
VCCQ
I/O5
I/O6
GNDQ
I/O7
VCC
LDQM
WE
1
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
GND
I/O15
GNDQ
I/O14
I/O13
VCCQ
I/O12
I/O11
GNDQ
I/O10
I/O9
VCCQ
I/O8
GND
NC
• Programmable burst sequence:
Sequential/Interleave
2
3
4
5
• Self refresh modes
6
7
• 4096 refresh cycles every 64 ms
• Random column address every clock cycle
• Programmable CAS latency (2, 3 clocks)
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
• Burst read/write and burst read/single write
operations capability
UDQM
CLK
CKE
NC
CAS
RAS
CS
• Burst termination by burst stop and precharge
command
BA0
BA1
A10
A11
A9
A8
• Byte controlled by LDQM and UDQM
A0
A7
A1
A6
• Industrial temperature availability
(133MHz, 100MHz)
A2
A5
A3
A4
VCC
GND
• Package: 400-mil 54-pin TSOP II,
a lead-free package is available.
PIN DESCRIPTIONS
WE
WriteEnable
A0-A11
BA0, BA1
I/O0 to I/O15
CLK
Address Input
LDQM
UDQM
Vcc
Lower Bye, Input/Output Mask
Upper Bye, Input/Output Mask
Power
Bank Select Address
Data I/O
System Clock Input
Clock Enable
GND
VccQ
GNDQ
NC
Ground
CKE
Power Supply for I/O Pin
Ground for I/O Pin
NoConnection
CS
Chip Select
RAS
RowAddressStrobeCommand
ColumnAddressStrobeCommand
CAS
Copyright © 2003 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
liabilityarisingoutoftheapplicationoruseofanyinformation, productsorservicesdescribedherein. Customersareadvisedtoobtainthelatestversionofthisdevicespecificationbeforerelyingon
anypublishedinformationandbeforeplacingordersforproducts.
Integrated Silicon Solution, Inc. — www.issi.com — 1-800-379-4774
R e v . C
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04/16/03