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PDF IDT71V25781 Data sheet ( Hoja de datos )
| Número de pieza | IDT71V25781 | |
| Descripción | (IDT71V25761 / IDT71V25781) Synchronous SRAMs | |
| Fabricantes | IDT | |
| Logotipo |  |
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128K X 36, 256K X 18
3.3V Synchronous SRAMs
2.5V I/O, Pipelined Outputs,
Burst Counter, Single Cycle Deselect
IDT71V25761
IDT71V25781
Features
x 128K x 36, 256K x 18 memory configurations
x Supports high system speed:
Commercial:
– 200MHz 3.1ns clock access time
Commercial and Industrial:
– 183MHz 3.3ns clock access time
– 166MHz 3.5ns clock access time
x LBO input selects interleaved or linear burst mode
x Self-timed write cycle with global write control (GW), byte write
enable (BWE), and byte writes (BWx)
x 3.3V core power supply
x Power down controlled by ZZ input
x 2.5V I/O
x Packaged in a JEDEC Standard 100-pin plastic thin quad
flatpack (TQFP), 119 ball grid array (BGA) and 165 fine pitch ball
grid array
Description
The IDT71V25761/781 are high-speed SRAMs organized as 128K
x 36/256K x 18. The IDT71V25761/781 SRAMs contain write, data,
addressandcontrolregisters. InternallogicallowstheSRAMtogenerate
a self-timed write based upon a decision which can be left until the end of
the write cycle.
The burst mode feature offers the highest level of performance to the
system designer, as the IDT71V25761/718 can provide four cycles of data
for a single address presented to the SRAM. An internal burst address
counter accepts the first cycle address from the processor, initiating the
access sequence. The first cycle of output data will be pipelined for one
cycle before it is available on the next rising clock edge. If burst mode
operation is selected (ADV=LOW), the subsequent three cycles of output
datawillbeavailabletotheuseronthenextthreerisingclockedges. The
order of these three addresses are defined by the internal burst counter
and the LBO input pin.
The IDT71V25761/781 SRAMs utilize IDT’s latest high-performance
CMOS process and are packaged in a JEDEC standard 14mm x 20mm
100-pin thin plastic quad flatpack (TQFP) as well as a 119 ball grid array
(BGA) and 165 fine pitch ball grid array (fBGA).
Pin Description Summary
A0-A17
Address Inputs
CE Chip Enable
CS0, CS1
Chip Selects
OE Output Enable
GW Global Write Enable
BWE Byte Write Enable
BW1, BW2, BW3, BW4(1)
Individual Byte Write Selects
CLK Clock
ADV Burst Address Advance
ADSC
Address Status (Cache Controller)
ADSP
Address Status (Processor)
LBO Linear / Interleaved Burst Order
ZZ Sleep Mode
I/O0-I/O31, I/OP1-I/OP4
Data Input / Output
VDD, VDDQ
Core Power, I/O Power
VSS Ground
NOTE:
1. BW3 and BW4 are not applicable for the IDT71V25781.
©2000 Integrated Device Technology, Inc.
1
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
Input
I/O
Supply
Supply
Synchronous
Synchronous
Synchronous
Asynchronous
Synchronous
Synchronous
Synchronous
N/A
Synchronous
Synchronous
Synchronous
DC
Asynchronous
Synchronous
N/A
N/A
5297 tbl 01
OCTOBER 2000
DSC-5297/01
1 page  
IDT71V25761, IDT71V25781, 128K x 36, 256K x 18, 3.3V Synchronous SRAMs with
2.5V I/O, Pipelined Outputs, Burst Counter, Single Cycle Deselect
Commercial and Industrial Temperature Ranges
Pin Configuration 128K x 36
100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81
I/OP3
I/O16
I/O17
VDDQ
VSS
I/O18
I/O19
I/O20
I/O21
VSS
VDDQ
I/O22
I/O23
VDD/NC(1)
VDD
NC
VSS
I/O24
I/O25
VDDQ
VSS
I/O26
I/O27
I/O28
I/O29
VSS
VDDQ
I/O30
I/O31
I/OP4
1 80
2 79
3 78
4 77
5 76
6 75
7 74
8 73
9 72
10 71
11 70
12 69
13 68
14 67
15 66
16 65
17 64
18 63
19 62
20 61
21 60
22 59
23 58
24 57
25 56
26 55
27 54
28 53
29 52
30 51
31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
I/OP2
I/O15
I/O14
VDDQ
VSS
I/O13
I/O12
I/O11
I/O10
VSS
VDDQ
I/O9
I/O8
VSS
NC
VDD
ZZ(3)
I/O7
I/O6
VDDQ
VSS
I/O5
I/O4
I/O3
I/O2
VSS
VDDQ
I/O1
I/O0
I/OP1
,
5297 drw 02
100 TQFP
Top View
NOTES:
1. Pin 14 can either be directly connected to VDD, or connected to an input voltage ≥ VIH, or left unconnected.
2. Pins 38 and 39 can be either NC or connected to VSS.
3. Pin 64 can be left unconnected and the device will always remain in active mode.
6.452
5 Page 
IDT71V25761, IDT71V25781, 128K x 36, 256K x 18, 3.3V Synchronous SRAMs with
2.5V I/O, Pipelined Outputs, Burst Counter, Single Cycle Deselect
Commercial and Industrial Temperature Ranges
Synchronous Write Function Truth Table(1, 2)
Operation GW BWE BW1 BW2 BW3 BW4
Read H H X X X X
Read H L H H H H
Write all Bytes
L
X
X
X
X
X
Write all Bytes
H
L
L
L
L
L
Write Byte 1(3)
H
L
L
H
H
H
Write Byte 2(3)
H
L
H
L
H
H
Write Byte 3(3)
H
L
H
H
L
H
Write Byte 4(3)
H
L
H
H
H
L
NOTES:
1. L = VIL, H = VIH, X = Don’t Care.
2. BW3 and BW4 are not applicable for the IDT71V2578.
3. Multiple bytes may be selected during the same cycle.
5297 tbl 12
Asynchronous Truth Table(1)
Operation(2)
OE
Read L
Read H
Write X
Deselected
X
Sleep Mode
X
ZZ
L
L
L
L
H
NOTES:
1. L = VIL, H = VIH, X = Don’t Care.
2. Synchronous function pins must be biased appropriately to satisfy operation requirements.
I/O Status
Data Out
High-Z
High-Z – Data In
High-Z
High-Z
Power
Active
Active
Active
Standby
Sleep
5297 tbl 13
Interleaved Burst Sequence Table (LBO=VDD)
Sequence 1
Sequence 2
A1 A0 A1 A0
First Address
000 1
Second Address
0 100
Third Address
10 11
Fourth Address(1)
11 10
NOTE:
1. Upon completion of the Burst sequence the counter wraps around to its initial state.
Sequence 3
A1 A0
10
11
00
01
Sequence 4
A1 A0
11
10
01
00
5297 tbl 14
Linear Burst Sequence Table (LBO=VSS)
Sequence 1
Sequence 2
A1 A0 A1 A0
First Address
000 1
Second Address
0 1 10
Third Address
10 11
Fourth Address(1)
1 10 0
NOTE:
1. Upon completion of the Burst sequence the counter wraps around to its initial state.
Sequence 3
A1 A0
10
11
00
01
Sequence 4
A1 A0
11
00
01
10
5297 tbl 15
6.1412
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet IDT71V25781.PDF ] | |
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