128K x 36, 256K x 18
3.3V Synchronous SRAMs
2.5V I/O, Flow-Through Outputs
Burst Counter, Single Cycle Deselect
Features
x
x
IDT71V2577
IDT71V2579
Description
The IDT71V2577/79 are high-speed SRAMs organized as
128K x 36/256K x 18. The IDT71V2577/79 SRAMs contain write, data,
address and control registers. There are no registers in the data output
path (flow-through architecture). Internal logic allows the SRAM to
generate 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 IDT71V2577/79 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 flow-through from the
array after a clock-to-data access time delay from the rising clock edge of
the same cycle. If burst mode operation is selected (ADV=LOW), the
subsequent three cycles of output data will be available to the user on the
next three rising clock edges. The order of these three addresses are
defined by the internal burst counter and the
LBO
input pin.
The IDT71V2577/79 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 a 165 fine pitch ball grid array (fBGA).
x
x
x
x
x
x
128K x 36, 256K x 18 memory configurations
Supports fast access times:
Commercial:
– 7.5ns up to 117MHz clock frequency
Commercial and Industrial:
– 8.0ns up to 100MHz clock frequency
– 8.5ns up to 87MHz clock frequency
LBO
input selects interleaved or linear burst mode
Self-timed write cycle with global write control (GW), byte write
enable (BWE), and byte writes (BWx)
3.3V core power supply
Power down controlled by ZZ input
2.5V I/O
Packaged in a JEDEC Standard 100-pin plastic thin quad
flatpack (TQFP), 119 ball grid array (BGA) and 165 fine pitch ball
grid array (fBGA)
Pin Description Summary
A
0
-A
17
CE
CS
0
,
CS
1
OE
GW
BWE
BW
1
,
BW
2
,
BW
3
,
BW
4
(1)
CLK
ADV
ADSC
ADSP
LBO
ZZ
I/O
0
-I/O
31
, I/O
P1
-I/O
P4
V
DD
, V
DDQ
V
SS
Address Inputs
Chip Enable
Chip Selects
Output Enable
Global Write Enable
Byte Write Enable
Individual Byte Write Selects
Clock
Burst Address Advance
Address Status (Cache Controller)
Address Status (Processor)
Linear / Interleaved Burst Order
Sleep Mode
Data Input / Output
Core Power, I/O Power
Ground
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
4877 tbl 01
NOTE:
1.
BW
3
and
BW
4
are not applicable for the IDT71V2579.
OCTOBER 2000
1
DSC-4877/06
© 2000 ntegrated Device Technology, Inc.
IDT71V2577, IDT71V2579, 128K x 36, 256K x 18, 3.3V Synchronous SRAMs with
2.5V I/O, Flow-Through Outputs, Burst Counter, Single Cycle Deselect
Commercial and Industrial Temperature Ranges
Pin Definition
(1)
Symbol
A
0
-A
17
ADSC
ADSP
ADV
Pin Function
Address Inputs
Address Status
(Cache Controller)
Address Status
(Processor)
Burst Address
Advance
Byte Write Enable
I/O
I
I
I
I
Active
N/A
LOW
LOW
LOW
Description
Synchronous Address inputs. The address register is triggered by a combi-nation of the rising
edge of CLK and
ADSC
Low or
ADSP
Low and
CE
Low.
Synchronous Address Status from Cache Controller.
ADSC
is an active LOW input that is
used to load the address registers with new addresses.
Synchronous Address Status from Processor.
ADSP
is an active LOW input that is used to
load the address registers with new addresses.
ADSP
is gated by
CE.
Synchronous Address Advance.
ADV
is an active LOW input that is used to advance the
internal burst counter, controlling burst access after the initial address is loaded. When the
input is HIGH the burst counter is not incremented; that is, there is no address advance.
Synchronous byte write enable gates the byte write inputs
BW
1
-BW
4
. If
BWE
is LOW at the
rising edge of CLK then
BWx
inputs are passed to the next stage in the circuit. If
BWE
is
HIGH then the byte write inputs are blocked and only
GW
can initiate a write cycle.
Synchronous byte write enables.
BW
1
controls I/O
0-7
, I/O
P1
,
BW
2
controls I/O
8-15
, I/O
P2
, etc.
Any active byte write causes all outputs to be disabled.
Synchronous chip enable.
CE
is used with CS
0
and
CS
1
to enable the IDT71V2577/79.
CE
also gates
ADSP.
This is the clock input. All timing references for the device are made with respect to this
input.
Synchronous active HIGH chip select. CS
0
is used with
CE
and
CS
1
to enable the chip.
Synchronous active LOW chip select.
CS
1
is used with
CE
and CS
0
to enable the chip.
Synchronous global write enable. This input will write all four 9-bit data bytes when LOW on
the rising edge of CLK.
GW
supersedes individual byte write enables.
Synchronous data input/output (I/O) pins. The data input path is registered, triggered by the
rising edge of CLK. The data output path is flow-through (no output register).
Asynchronous burst order selection input. When
LBO
is HIGH, the inter-leaved burst
sequence is selected. When
LBO
is LOW the Linear burst sequence is selected.
LBO
is a
static input and must not change state while the device is operating.
Asynchronous output enable. When
OE
is LOW the data output drivers are enabled on the
I/O pins if the chip is also selected. When
OE
is HIGH the I/O pins are in a high-impedance
state.
3.3V core power supply.
2.5V I/O Supply.
Ground.
NC pins are not electrically connected to the device.
Asynchronous sleep mode input. ZZ HIGH will gate the CLK internally and power down the
IDT71V2577/79 to its lowest power consumption level. Data retention is guaranteed in
Sleep Mode.
4877 tbl 02
BWE
I
LOW
BW
1
-BW
4
CE
CLK
CS
0
CS
1
GW
I/O
0
-I/O
31
I/O
P1
-I/O
P4
LBO
Individual Byte
Write Enables
Chip Enable
Clock
Chip Select 0
Chip Select 1
Global Write
Enable
Data Input/Output
Linear Burst Order
I
I
I
I
I
I
I/O
I
LOW
LOW
N/A
HIGH
LOW
LOW
N/A
LOW
OE
Output Enable
I
LOW
V
DD
V
DDQ
V
SS
NC
ZZ
Power Supply
Power Supply
Ground
No Connect
Sleep Mode
N/A
N/A
N/A
N/A
1
N/A
N/A
N/A
N/A
HIGH
NOTE:
1. All synchronous inputs must meet specified setup and hold times with respect to CLK.
6.42
2
IDT71V2577, IDT71V2579, 128K x 36, 256K x 18, 3.3V Synchronous SRAMs with
2.5V I/O, Flow-Through Outputs, Burst Counter, Single Cycle Deselect
Commercial and Industrial Temperature Ranges
Functional Block Diagram
LBO
ADV
CEN
Burst
Sequence
INTERNAL
ADDRESS
CLK
ADSC
ADSP
CLK EN
ADDRESS
REGISTER
Byte 1
Write Register
Binary
Counter
CLR
2
Burst
Logic
17/18
A0*
A1*
Q0
Q1
128K x 36/
256K x 18-
BIT
MEMORY
ARRAY
2
17/18
A
0
,A
1
A
2 -
A
17
36/18
36/18
A
0 -
A
16/17
GW
BWE
BW
1
Byte 1
Write Driver
9
Byte 2
Write Register
Byte 2
Write Driver
BW
2
Byte 3
Write Register
9
Byte 3
Write Driver
BW
3
Byte 4
Write Register
9
Byte 4
Write Driver
BW
4
9
CE
CS
0
CS
1
D
Q
Enable
Register
DATA INPUT
REGISTER
CLK EN
ZZ
Powerdown
OE
OE
I/O
0
- I/O
31
I/O
P1
- I/O
P4
36/18
OUTPUT
BUFFER
,
4877 drw 01
6.42
3
IDT71V2577, IDT71V2579, 128K x 36, 256K x 18, 3.3V Synchronous SRAMs with
2.5V I/O, Flow-Through Outputs, Burst Counter, Single Cycle Deselect
Commercial and Industrial Temperature Ranges
Absolute Maximum Ratings
(1)
Symbol
V
TERM
(2)
Rating
Terminal Voltage with
Respect to GND
Terminal Voltage with
Respect to GND
Terminal Voltage with
Respect to GND
Terminal Voltage with
Respect to GND
Commercial
Operating Temperature
Industrial
Operating Temperature
Commerical &
Industrial Values
-0.5 to +4.6
-0.5 to V
DD
-0.5 to V
DD
+0.5
-0.5 to V
DDQ
+0.5
-0 to +70
-40 to +85
-55 to +125
-55 to +125
2.0
50
Unit
V
V
V
V
o
Recommended Operating
Temperature and Supply Voltage
Grade
Commercial
Industrial
Temperature
(1)
0°C to +70°C
-40°C to +85°C
V
SS
0V
0V
V
DD
3.3V±5%
3.3V±5%
V
DDQ
2.5V±5%
2.5V±5%
4877 tbl 04
V
TERM
(3,6)
V
TERM
(4,6)
V
TERM
(5,6)
NOTES:
1. TA is the “instant on” case temperature.
C
C
C
C
Recommended DC Operating
Conditions
Symbol
Parameter
Core Supply Voltage
I/O Supply Voltage
Supply Voltage
Input High Voltage - Inputs
Input High Voltage - I/O
Input Low Voltage
Min.
3.135
2.375
0
1.7
1.7
-0.3
(2)
Typ.
3.3
2.5
0
____
____
____
T
A
(7)
Max.
3.465
2.625
0
V
DD
+ 0.3
V
DDQ
+ 0.3
(1)
0.7
Unit
V
V
V
V
V
V
4877 tbl 05
o
V
DD
V
DDQ
T
BIAS
T
STG
P
T
I
OUT
Temperature
Under Bias
Storage
Temperature
Power Dissipation
DC Output Current
o
V
SS
V
IH
o
V
IH
V
IL
W
mA
4877 tbl 03
NOTES:
1. V
IH
(max) = V
DDQ
+ 1.0V for pulse width less than t
CYC/2
, once per cycle.
2. V
IL
(min) = -1.0V for pulse width less than t
CYC/2
, once per cycle.
NOTES:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may
cause permanent damage to the device. This is a stress rating only and functional
operation of the device at these or any other conditions above those indicated
in the operational sections of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect reliability.
2. V
DD
terminals only.
3. V
DDQ
terminals only.
4. Input terminals only.
5. I/O terminals only.
6. This is a steady-state DC parameter that applies after the power supplies have
ramped up. Power supply sequencing is not necessary; however, the voltage
on any input or I/O pin cannot exceed V
DDQ
during power supply ramp up.
7. TA is the “instant on” case temperature.
100 Pin TQFP Capacitance
(T
A
= +25°C, f = 1.0MHz)
Symbol
C
IN
C
I/O
Parameter
(1)
Input Capacitance
I/O Capacitance
Conditions
V
IN
= 3dV
V
OUT
= 3dV
Max.
5
7
Unit
pF
pF
4877 tbl 07
119 BGA Capacitance
(T
A
= +25°C, f = 1.0MHz)
Symbol
C
IN
C
I/O
Parameter
(1)
Input Capacitance
I/O Capacitance
Conditions
V
IN
= 3dV
V
OUT
= 3dV
Max.
7
7
Unit
pF
pF
4877 tbl 07a
165 fBGA Capacitance
(T
A
= +25°C, f = 1.0MHz)
Symbol
C
IN
C
I/O
Parameter
(1)
Input Capacitance
I/O Capacitance
Conditions
V
IN
= 3dV
V
OUT
= 3dV
Max.
TBD
TBD
Unit
pF
pF
4877 tbl 07b
NOTE:
1. This parameter is guaranteed by device characterization, but not production tested.
6.42
4
IDT71V2577, IDT71V2579, 128K x 36, 256K x 18, 3.3V Synchronous SRAMs with
2.5V I/O, Flow-Through Outputs, Burst Counter, Single Cycle Deselect
Commercial and Industrial Temperature Ranges
Pin Configuration 128K x 36
A
6
A
7
CE
CS
0
BW
4
BW
3
BW
2
BW
1
CS
1
V
DD
V
SS
CLK
GW
BWE
OE
ADSC
ADSP
ADV
A
8
A
9
100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81
I/O
P3
I/O
16
I/O
17
V
DDQ
V
SS
I/O
18
I/O
19
I/O
20
I/O
21
V
SS
V
DDQ
I/O
22
I/O
23
V
SS
(1)
V
DD
NC
V
SS
I/O
24
I/O
25
V
DDQ
V
SS
I/O
26
I/O
27
I/O
28
I/O
29
V
SS
V
DDQ
I/O
30
I/O
31
I/O
P4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
I/O
P2
I/O
15
I/O
14
V
DDQ
V
SS
I/O
13
I/O
12
I/O
11
I/O
10
V
SS
V
DDQ
I/O
9
I/O
8
V
SS
NC
V
DD
ZZ
(3)
I/O
7
I/O
6
V
DDQ
V
SS
I/O
5
I/O
4
I/O
3
I/O
2
V
SS
V
DDQ
I/O
1
I/O
0
I/O
P1
4877 drw 02a
,
NOTES:
1. Pin 14 does not have to be directly connected to V
SS
as long as the input voltage is < V
IL
.
2. Pins 38 and 39 can be either NC or connected to V
SS.
3. Pin 64 can be left unconnected and the device will always remain in active mode.
LBO
A
5
A
4
A
3
A
2
A
1
A
0
NC
(2)
NC
(2)
V
SS
V
DD
100 TQFP
Top View
6.42
5
NC
NC
A
10
A
11
A
12
A
13
A
14
A
15
A
16
FPGA/CPLD
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