IS61SP25616 |
® |
IS61SP25618 |
ISSI |
256K x 16, 256K x 18 SYNCHRONOUS PIPELINED STATIC RAM
APRIL 2001
FEATURES
•Internal self-timed write cycle
•Individual Byte Write Control and Global Write
•Clock controlled, registered address, data and control
•Pentium™ or linear burst sequence control using MODE input
•Three chip enables for simple depth expansion and address pipelining
•Common data inputs and data outputs
•JEDEC 100-Pin TQFP and 119-pin PBGA package
•Single +3.3V, +10%, -5% power supply
•Power-down snooze mode
FAST ACCESS TIME
DESCRIPTION
The ISSI IS61SP25616 and IS61SP25618 is a high-speed synchronous static RAM designed to provide a burstable, high-performance memory for high speed networking and communication applications. It is organized as 262,144 words by 16 bits and 18 bits, fabricated with ISSI's advanced CMOS technology. The device integrates a 2-bit burst counter, high-speed SRAM core, and high-drive capability outputs into a single monolithic circuit. All synchronous inputs pass through registers controlled by a positive-edge-triggered single clock input.
Write cycles are internally self-timed and are initiated by the rising edge of the clock input. Write cycles can be from one to four bytes wide as controlled by the write control inputs.
Separate byte enables allow individual bytes to be written. BW1 controls DQ1-8, BW2 controls DQ9-16, conditioned by BWE being LOW. A LOW on GW input would cause all bytes to be written.
Bursts can be initiated with either ADSP (Address Status Processor) or ADSC (Address Status Cache Controller) input pins. Subsequent burst addresses can be generated internally and controlled by the ADV (burst address advance) input pin.
The mode pin is used to select the burst sequence order, Linear burst is achieved when this pin is tied LOW. Interleave burst is achieved when this pin is tied HIGH or left floating.
Symbol |
Parameter |
-166 |
-150 |
-133 |
-5 |
Units |
tKQ |
Clock Access Time |
3.5 |
3.8 |
4 |
5 |
ns |
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tKC |
Cycle Time |
6 |
6.7 |
7.5 |
10 |
ns |
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Frequency |
166 |
150 |
133 |
100 |
MHz |
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ISSI reserves the right to make changes to its products at any time without notice in order to improve design and supply the best possible product. We assume no responsibility for any errors which may appear in this publication. © Copyright 2001, Integrated Silicon Solution, Inc.
Integrated Silicon Solution, Inc. — 1-800-379-4774 |
1 |
Rev. A
04/17/01
IS61SP25616 |
ISSI |
® |
IS61SP25618 |
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BLOCK DIAGRAM
MODE |
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ADV |
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CLK |
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BURST |
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2 |
18 |
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COUNTER |
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ADSC |
CLK2 |
CLR |
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256K x 16/256K x 18 |
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MEMORY ARRAY |
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ADSP |
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A2-A17 |
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2 |
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18 |
16 |
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A1 |
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A0 |
ADDRESS |
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REGISTER |
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GW |
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16 or 18 |
16 or 18 |
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BWE |
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BW1 |
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BW1 |
BYTE WRITE |
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REGISTER |
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BW2 |
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BW2 |
BYTE WRITE |
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2 |
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REGISTER |
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DATA |
DATA |
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INPUT |
OUTPUT |
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CLK |
REGISTER |
REGISTER |
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CLK2 |
CLK |
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CE1 |
ENABLE |
ENABLE |
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CE2 |
REGISTER |
REGISTER |
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CE2 |
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OE |
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DQ1 - DQ16 |
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or |
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DQ1 - DQ18 |
2 |
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Integrated Silicon Solution, Inc. — 1-800-379-4774 |
Rev. A
04/17/01
IS61SP25616 |
ISSI |
® |
IS61SP25618 |
|
PIN CONFIGURATION
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119-pin PBGA (Top View) |
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100-Pin TQFP |
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1 |
2 |
3 |
4 |
5 |
6 |
7 |
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A6 |
A7 CE |
CE2 |
NC |
NC |
BW2 |
BW1 |
CE2 VCC |
GND CLK GW BWE OE |
ADSC ADSP ADV |
A8 |
A9 |
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A |
A6 |
A4 |
ADSP |
A8 |
A16 |
VCCQ |
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100 99 98 97 |
96 95 94 93 |
92 91 90 89 88 87 86 |
85 84 83 82 81 |
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VCCQ |
NC |
1 |
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80 |
A17 |
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B |
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NC |
2 |
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79 |
NC |
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NC |
CE2 |
A3 |
ADSC |
A9 |
CE2 |
NC |
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NC |
3 |
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78 |
NC |
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C |
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VCCQ |
4 |
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77 |
VCCQ |
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NC |
A7 |
A2 |
VCC |
A12 |
A15 |
NC |
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GND |
5 |
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76 |
GND |
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D |
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NC |
6 |
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75 |
NC |
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DQ9 |
NC |
GND |
NC |
GND |
NC |
NC |
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NC |
7 |
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74 |
NC |
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E |
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DQ9 |
8 |
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73 |
DQ8 |
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NC |
DQ10 |
GND |
CE |
GND |
NC |
DQ8 |
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DQ10 |
9 |
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72 |
DQ7 |
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F |
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GND |
10 |
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71 |
GND |
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VCCQ |
NC |
GND |
OE |
GND |
DQ7 |
VCCQ |
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VCCQ |
11 |
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70 |
VCCQ |
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G |
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DQ11 |
12 |
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69 |
DQ6 |
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NC |
DQ11 |
BW2 |
ADV |
GND |
NC |
DQ6 |
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H |
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DQ12 |
13 |
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68 |
DQ5 |
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NC |
14 |
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67 |
GND |
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DQ12 |
NC |
GND |
GW |
GND |
DQ5 |
NC |
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J |
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VCC |
15 |
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66 |
NC |
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NC |
16 |
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65 |
VCC |
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VCCQ |
VCC |
NC |
VCC |
NC |
VCC |
VCCQ |
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K |
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GND |
17 |
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64 |
ZZ |
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DQ13 |
18 |
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63 |
DQ4 |
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NC |
DQ13 |
GND |
CLK |
GND |
NC |
DQ4 |
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L |
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DQ14 |
19 |
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62 |
DQ3 |
DQ14 |
NC |
GND |
NC |
BW1 |
DQ3 |
NC |
VCCQ |
20 |
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61 |
VCCQ |
M |
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GND |
21 |
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60 |
GND |
VCCQ |
DQ15 |
GND |
BWE |
GND |
NC |
VCCQ |
DQ15 |
22 |
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59 |
DQ2 |
N |
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DQ16 |
23 |
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58 |
DQ1 |
DQ16 |
NC |
GND |
A1 |
GND |
DQ2 |
NC |
NC |
24 |
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57 |
NC |
P |
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NC |
25 |
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56 |
NC |
NC |
NC |
GND |
A0 |
GND |
NC |
DQ1 |
GND |
26 |
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55 |
GND |
R |
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VCCQ |
27 |
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54 |
VCCQ |
NC |
A5 |
MODE |
VCC |
NC |
A13 |
NC |
NC |
28 |
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53 |
NC |
T |
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NC |
29 |
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52 |
NC |
NC |
A11 |
A10 |
NC |
A14 |
A17 |
ZZ |
NC |
30 |
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51 |
NC |
U |
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31 32 33 |
34 35 36 37 38 39 40 |
41 42 43 44 45 46 47 48 49 50 |
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VCCQ |
NC |
NC |
NC |
NC |
NC |
VCCQ |
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MODE |
A5 A4 |
A3 |
A2 |
A1 |
A0 |
NC |
NC GND |
VCC NC NC A10 A11 |
A12 A13 A14 |
A15 |
A16 |
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256K x 16 |
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PIN DESCRIPTIONS
A0, A1 |
Synchronous Address Inputs. These |
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pins must tied to the two LSBs of the |
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address bus. |
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A2-A17 |
Synchronous Address Inputs |
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CLK |
Synchronous Clock |
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ADSP |
Synchronous Processor Address |
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Status |
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ADSC |
Synchronous Controller Address |
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Status |
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ADV |
Synchronous Burst Address Advance |
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BW1-BW2 |
Synchronous Byte Write Enable |
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BWE |
Synchronous Byte Write Enable |
GW |
Synchronous Global Write Enable |
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CE, CE2, CE2 Synchronous Chip Enable |
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OE |
Output Enable |
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DQ1-DQ16 |
Synchronous Data Input/Output |
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MODE |
Burst Sequence Mode Selection |
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VCC |
+3.3V Power Supply |
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GND |
Ground |
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VCCQ |
Isolated Output Buffer Supply: +3.3V |
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ZZ |
Snooze Enable |
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Integrated Silicon Solution, Inc. — 1-800-379-4774 |
3 |
Rev. A
04/17/01
IS61SP25616 |
ISSI |
® |
IS61SP25618 |
|
PIN CONFIGURATION
|
119-pin PBGA (Top View) |
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100-Pin TQFP |
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1 |
2 |
3 |
4 |
5 |
6 |
7 |
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A6 |
A7 CE |
CE2 |
NC |
NC |
BW2 BW1 |
CE2 VCC |
GND CLK GW BWE OE |
ADSC |
ADSP |
ADV |
A8 |
A9 |
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A |
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100 99 98 97 |
96 95 94 93 |
92 91 90 89 88 87 86 |
85 84 83 82 81 |
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VCCQ |
A6 |
A4 |
ADSP |
A8 |
A16 |
VCCQ |
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NC |
1 |
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80 |
A17 |
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B |
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NC |
2 |
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79 |
NC |
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NC |
CE2 |
A3 |
ADSC |
A9 |
CE2 |
NC |
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NC |
3 |
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78 |
NC |
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C |
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VCCQ |
4 |
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77 |
VCCQ |
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NC |
A7 |
A2 |
VCC |
A12 |
A15 |
NC |
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GND |
5 |
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76 |
GND |
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D |
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NC |
6 |
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75 |
NC |
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DQ9 |
NC |
GND |
NC |
GND |
DQP1 |
NC |
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NC |
7 |
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74 |
DQP1 |
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E |
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DQ10 |
GND |
CE |
GND |
NC |
DQ8 |
DQ9 |
8 |
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73 |
DQ8 |
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NC |
DQ10 |
9 |
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72 |
DQ7 |
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F |
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NC |
GND |
OE |
GND |
DQ7 |
VCCQ |
GND |
10 |
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71 |
GND |
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VCCQ |
VCCQ |
11 |
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70 |
VCCQ |
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G |
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DQ11 |
12 |
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69 |
DQ6 |
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NC |
DQ11 |
BW2 |
ADV |
GND |
NC |
DQ6 |
DQ12 |
13 |
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68 |
DQ5 |
H |
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NC |
14 |
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67 |
GND |
DQ12 |
NC |
GND |
GW |
GND |
DQ5 |
NC |
VCC |
15 |
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66 |
NC |
J |
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NC |
16 |
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65 |
VCC |
VCCQ |
VCC |
NC |
VCC |
NC |
VCC |
VCCQ |
GND |
17 |
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64 |
ZZ |
K |
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DQ13 |
18 |
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63 |
DQ4 |
NC |
DQ13 |
GND |
CLK |
GND |
NC |
DQ4 |
DQ14 |
19 |
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62 |
DQ3 |
L |
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VCCQ |
20 |
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61 |
VCCQ |
DQ14 |
NC |
GND |
NC |
BW1 |
DQ3 |
NC |
GND |
21 |
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60 |
GND |
M |
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DQ15 |
22 |
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59 |
DQ2 |
VCCQ |
DQ15 |
GND |
BWE |
GND |
NC |
VCCQ |
DQ16 |
23 |
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58 |
DQ1 |
N |
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DQP2 |
24 |
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57 |
NC |
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NC |
25 |
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56 |
NC |
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DQ16 |
NC |
GND |
A1 |
GND |
DQ2 |
NC |
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P |
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GND |
26 |
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55 |
GND |
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VCCQ |
27 |
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54 |
VCCQ |
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NC |
DQP2 |
GND |
A0 |
GND |
NC |
DQ1 |
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R |
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NC |
28 |
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53 |
NC |
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NC |
29 |
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52 |
NC |
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NC |
A5 |
MODE |
VCC |
GND |
A13 |
NC |
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NC |
30 |
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51 |
NC |
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T |
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31 32 33 |
34 35 36 37 38 39 40 |
41 42 43 44 45 46 47 48 49 50 |
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NC |
A11 |
A10 |
NC |
A14 |
A17 |
ZZ |
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U |
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MODE |
A5 A4 |
A3 |
A2 |
A1 |
A0 NC |
NC GND |
VCC NC NC A10 A11 |
A12 |
A13 |
A14 |
A15 |
A16 |
|
VCCQ |
NC |
NC |
NC |
NC |
NC |
VCCQ |
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256K x 18 |
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PIN DESCRIPTIONS
A0, A1 |
Synchronous Address Inputs. These |
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pins must tied to the two LSBs of the |
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address bus. |
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A2-A17 |
Synchronous Address Inputs |
|
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CLK |
Synchronous Clock |
|
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ADSP |
Synchronous Processor Address |
|
Status |
|
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ADSC |
Synchronous Controller Address |
|
Status |
|
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ADV |
Synchronous Burst Address Advance |
|
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BW1-BW2 |
Synchronous Byte Write Enable |
|
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BWE |
Synchronous Byte Write Enable |
|
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GW |
Synchronous Global Write Enable |
|
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CE, CE2, CE2 |
Synchronous Chip Enable |
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OE |
Output Enable |
|
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DQ1-DQ16 |
Synchronous Data Input/Output |
|
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MODE |
Burst Sequence Mode Selection |
|
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VCC |
+3.3V Power Supply |
|
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GND |
Ground |
|
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VCCQ |
Isolated Output Buffer Supply: +3.3V |
|
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ZZ |
Snooze Enable |
|
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DQP1-DQP2 |
Parity Data I/O DQP1 is parity for DQ1-8; |
|
DQP2 is parity for DQ9-16 |
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4 Integrated Silicon Solution, Inc. — 1-800-379-4774
Rev. A
04/17/01
IS61SP25616 |
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ISSI |
® |
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IS61SP25618 |
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||
TRUTH TABLE |
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Address |
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Operation |
Used |
CE |
CE2 |
CE2 |
ADSP |
ADSC |
ADV |
WRITE |
OE |
DQ |
|
Deselected, Power-down |
None |
H |
X |
X |
X |
L |
X |
X |
X |
High-Z |
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Deselected, Power-down |
None |
L |
X |
H |
L |
X |
X |
X |
X |
High-Z |
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Deselected, Power-down |
None |
L |
L |
X |
L |
X |
X |
X |
X |
High-Z |
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Deselected, Power-down |
None |
X |
X |
H |
H |
L |
X |
X |
X |
High-Z |
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Deselected, Power-down |
None |
X |
L |
X |
H |
L |
X |
X |
X |
High-Z |
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Read Cycle, Begin Burst |
External |
L |
H |
L |
L |
X |
X |
X |
X |
Q |
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Read Cycle, Begin Burst |
External |
L |
H |
L |
H |
L |
X |
Read |
X |
Q |
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Write Cycle, Begin Burst |
External |
L |
H |
L |
H |
L |
X |
Write |
X |
D |
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Read Cycle, Continue Burst |
Next |
X |
X |
X |
H |
H |
L |
Read |
L |
Q |
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Read Cycle, Continue Burst |
Next |
X |
X |
X |
H |
H |
L |
Read |
H |
High-Z |
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Read Cycle, Continue Burst |
Next |
H |
X |
X |
X |
H |
L |
Read |
L |
Q |
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Read Cycle, Continue Burst |
Next |
H |
X |
X |
X |
H |
L |
Read |
H |
High-Z |
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Write Cycle, Continue Burst |
Next |
X |
X |
X |
H |
H |
L |
Write |
X |
D |
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Write Cycle, Continue Burst |
Next |
H |
X |
X |
X |
H |
L |
Write |
X |
D |
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Read Cycle, Suspend Burst |
Current |
X |
X |
X |
H |
H |
H |
Read |
L |
Q |
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Read Cycle, Suspend Burst |
Current |
X |
X |
X |
H |
H |
H |
Read |
H |
High-Z |
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Read Cycle, Suspend Burst |
Current |
H |
X |
X |
X |
H |
H |
Read |
L |
Q |
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Read Cycle, Suspend Burst |
Current |
H |
X |
X |
X |
H |
H |
Read |
H |
High-Z |
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Write Cycle, Suspend Burst |
Current |
X |
X |
X |
H |
H |
H |
Write |
X |
D |
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Write Cycle, Suspend Burst |
Current |
H |
X |
X |
X |
H |
H |
Write |
X |
D |
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PARTIAL TRUTH TABLE
Function |
GW |
BWE |
BW1 |
BW2 |
Read |
H |
H |
X |
X |
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Read |
H |
L |
H |
H |
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Write Byte 1 |
H |
L |
L |
H |
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Write All Bytes |
H |
L |
L |
L |
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Write All Bytes |
L |
X |
X |
X |
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|
Integrated Silicon Solution, Inc. — 1-800-379-4774 |
5 |
Rev. A
04/17/01