HIGH-SPEED 32K x 16
SYNCHRONOUS
DUAL-PORT STATIC RAM
Features
x
x
IDT709279S/L
x
x
x
True Dual-Ported memory cells which allow simultaneous
access of the same memory location
High-speed clock to data access
– Commercial: 9/12/15ns (max.)
– Industrial: 12ns (max.)
Low-power operation
– IDT709279S
Active: 950mW (typ.)
Standby: 5mW (typ.)
– IDT709279L
Active: 950mW (typ.)
Standby: 1mW (typ.)
Flow-Through or Pipelined output mode on either port via
the
FT/PIPE
pin
Counter enable and reset features
x
x
x
x
x
x
Dual chip enables allow for depth expansion without
additional logic
Full synchronous operation on both ports
– 4ns setup to clock and 1ns hold on all control, data, and
address inputs
– Data input, address, and control registers
– Fast 9ns clock to data out in the Pipelined output mode
– Self-timed write allows fast cycle time
– 15ns cycle time, 66MHz operation in Pipelined output mode
Separate upper-byte and lower-byte controls for
multiplexed bus and bus matching compatibility
TTL- compatible, single 5V (±10%) power supply
Industrial temperature range (–40°C to +85°C) is
available for selected speeds
Available in a 100-pin Thin Quad Flatpack (TQFP) package
Functional Block Diagram
R/W
L
UB
L
CE
0L
CE
1L
LB
L
OE
L
1
0
0/1
1
0
0/1
R/W
R
UB
R
CE
0R
CE
1R
LB
R
OE
R
FT/PIPE
L
I/O
8L
-I/O
15L
0/1
1b 0b b a 1a 0a
0a 1a
a b 0b 1b
0/1
FT/PIPE
R
I/O
8R
-I/O
15R
,
I/O
Control
I/O
0L
-I/O
7L
I/O
Control
I/O
0R
-I/O
7R
A
14L
A
0L
CLK
L
ADS
L
CNTEN
L
CNTRST
L
Counter/
Address
Reg.
MEMORY
ARRAY
Counter/
Address
Reg.
A
14R
A
0R
CLK
R
ADS
R
CNTEN
R
CNTRST
R
3243 drw 01
AUGUST 2001
1
©2001 Integrated Device Technology, Inc.
DSC-3243/12
IDT709279S/L
High-Speed 32K x 16 Synchronous Dual-Port Static RAM
Preliminary
Industrial and Commercial Temperature Ranges
Description
The IDT709279 is a high-speed 32K x 16 bit synchronous Dual-
Port RAM. The memory array utilizes Dual-Port memory cells to allow
simultaneous access of any address from both ports. Registers on
control, data, and address inputs provide minimal setup and hold
times. The timing latitude provided by this approach allows systems
to be designed with very short cycle times.
With an input data register, the IDT709279 has been optimized for
applications having unidirectional or bidirectional data flow in bursts.
An automatic power down feature, controlled by
CE
0
and CE
1,
permits
the on-chip circuitry of each port to enter a very low standby power
mode. Fabricated using IDT’s CMOS high-performance technology,
these devices typically operate on only 950mW of power.
Pin Configurations
(1,2,3)
Index
A
9L
A
10L
A
11L
A
12L
A
13L
A
14L
NC
NC
NC
LB
L
UB
L
CE
0L
CE
1L
CNTRST
L
Vcc
R/W
L
OE
L
FT/PIPE
L
GND
I/O
15L
I/O
14L
I/O
13L
I/O
12L
I/O
11L
I/O
10L
100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76
1
75
2
74
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
73
72
71
70
69
68
67
A
8L
A
7L
A
6L
A
5L
A
4L
A
3L
A
2L
A
1L
A
0L
CNTEN
L
CLK
L
ADS
L
GND
ADS
R
CLK
R
CNTEN
R
A
0R
A
1R
A
2R
A
3R
A
4R
A
5R
A
6R
A
7R
A
8R
IDT709279PF
PN100-1
(4)
100-Pin TQFP
Top View
(5)
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
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
A
9R
A
10R
A
11R
A
12R
A
13R
A
14R
NC
NC
NC
LB
R
UB
R
CE
0R
CE
1R
CNTRST
R
GND
R/W
R
OE
R
FT/PIPE
R
GND
I/O
15R
I/O
14R
I/O
13R
I/O
12R
I/O
11R
I/O
10R
I/O
9L
I/O
8L
Vcc
I/O
7
L
I/O
6L
I/O
5L
I/O
4L
I/O
3L
I/O
2L
GND
I/O
IL
I/O
0L
GND
I/O
0R
I/O
1R
I/O
2R
I/O
3R
I/O
4R
I/O
5R
I/O
6R
Vcc
I/O
7R
I/O
8R
I/O
9R
NC
NOTES:
1. All V
CC
pins must be connected to power supply.
2. All GND pins must be connected to ground supply.
3. Package body is approximately 14mm x 14mm x 1.4mm
4. This package code is used to reference the package diagram.
5. This text does not indicate orientation of the actual part-marking.
3243 drw 02
2
6.42
IDT709279S/L
High-Speed 32K x 16 Synchronous Dual-Port Static RAM
Preliminary
Industrial and Commercial Temperature Ranges
Pin Names
Left Port
CE
0L
, CE
1L
R/W
L
OE
L
A
0L
- A
14L
I/O
0L
- I/O
15L
CLK
L
UB
L
LB
L
ADS
L
CNTEN
L
CNTRST
L
FT/PIPE
L
Right Port
CE
0R
, CE
1R
R/W
R
OE
R
A
0R
- A
14R
I/O
0R
- I/O
15R
CLK
R
UB
R
LB
R
ADS
R
CNTEN
R
CNTRST
R
FT/PIPE
R
V
CC
GND
Names
Chip Enables
Read/Write Enable
Output Enable
Address
Data Input/Output
Clock
Upper Byte Select
Lower Byte Select
Address Strobe
Counter Enable
Counter Reset
Flow-Through/Pipeline
Power
Ground
3243 tbl 01
Truth Table IRead/Write and Enable Control
(1,2,3)
OE
X
X
X
X
X
X
L
L
L
H
CLK
↑
↑
↑
↑
↑
↑
↑
↑
↑
X
CE
0
H
X
L
L
L
L
L
L
L
L
CE
1
X
L
H
H
H
H
H
H
H
H
UB
X
X
H
L
H
L
L
H
L
L
LB
X
X
H
H
L
L
H
L
L
L
R/W
X
X
X
L
L
L
H
H
H
X
Upper
Byte
I/O
8-15
High-Z
High-Z
High-Z
D
IN
High-Z
D
IN
D
OUT
High-Z
D
OUT
High-Z
Lower B
yte
I/O
0-7
High-Z
High-Z
High-Z
High-Z
D
IN
D
IN
High-Z
D
OUT
D
OUT
High-Z
Mode
Deselected—Power Down
Deselected—Power Down
Both Bytes Deselected
Write to Upper Byte Only
Write to Lower Byte Only
Write to Both Bytes
Read Upper Byte Only
Read Lower Byte Only
Read Both Bytes
Outputs Disabled
3243 tbl 02
NOTES:
1. "H" = V
IH,
"L" = V
IL,
"X" = Don't Care.
2.
ADS, CNTEN, CNTRST
= X.
3.
OE
is an asynchronous input signal.
6.42
3
IDT709279S/L
High-Speed 32K x 16 Synchronous Dual-Port Static RAM
Preliminary
Industrial and Commercial Temperature Ranges
Truth Table IIAddress Counter Control
(1,2)
Address
X
An
An
X
Previous
Address
X
X
Ap
Ap
Addr
Used
0
An
Ap
Ap + 1
CLK
↑
↑
↑
↑
ADS
X
L
(4)
H
H
CNTEN
X
X
H
L
(5)
CNTRST
L
(4)
H
H
H
I/O
(3)
D
I/O
(0)
D
I/O
(n)
D
I/O
(p)
D
I/O
(p+1)
Counter Reset to Address 0
External Address Used
External Address Blocked—Counter disabled (Ap reused)
Counter Enabled—Internal Address generation
3243 tbl 03
MODE
NOTES:
1. "H" = V
IH,
"L" = V
IL,
"X" = Don't Care.
2.
CE
0
,
LB, UB,
and
OE
= V
IL
; CE
1
and R/W = V
IH
.
3. Outputs configured in Flow-Through Output mode: if outputs are in Pipelined mode the data out will be delayed by one cycle.
4.
ADS
is independent of all other signals including
CE
0
, CE
1
,
UB
and
LB.
5. The address counter advances if
CNTEN
= V
IL
on the rising edge of CLK, regardless of all other signals including
CE
0
, CE
1
,
UB
and
LB.
Recommended DC Operating
Recommended Operating
(1)
Conditions
Temperature and Supply Voltage
Grade
Commercial
Industrial
Ambient
Temperature
0
O
C to +70
O
C
-40
O
C to +85
O
C
GND
0V
0V
Vcc
5.0V
+
10%
5.0V
+
10%
3243 tbl 04
Symbol
V
CC
GND
V
IH
V
IL
Parameter
Supply Voltage
Ground
Input High Voltage
Input Low Voltage
Min.
4.5
0
2.2
-0.5
(2)
Typ.
5.0
0
____
Max.
5.5
0
6.0
(1)
0.8
Unit
V
V
V
V
3243 tbl 05
NOTES:
1. This is the parameter T
A
. This is the "instant on" case temperature.
____
NOTES:
1. V
TERM
must not exceed V
cc
+ 10%.
2. V
IL
> -1.5V for pulse width less than 10ns.
Absolute Maximum Ratings
(1)
Symbol
V
TERM
(2)
Rating
Terminal Voltage
with Respect
to GND
Temperature
Under Bias
Storage
Temperature
DC Output
Current
Commercial
& Industrial
-0.5 to +7.0
Unit
V
CAPACITANCE
(1)
Symbol
C
IN
C
OUT
(3)
Parameter
Input Capacitance
Output Capacitance
(T
A
= +25°C, f = 1.0MH
z
)
Conditions
(2)
V
IN
= 3dV
V
OUT
= 3dV
Max.
9
10
Unit
pF
pF
3243 tbl 07
T
BIAS
T
STG
I
OUT
-55 to +125
-65 to +150
50
o
C
C
o
mA
3243 tbl 06
NOTES:
1. These parameters are determined by device characterization, but are not
production tested.
2. 3dV references the interpolated capacitance when the input and output switch from
0V to 3V or from 3V to 0V.
3. C
OUT
also references C
I/O
.
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
TERM
must not exceed V
cc
+ 10% for more than 25% of the cycle time or 10ns
maximum, and is limited to < 20mA for the period of V
TERM
> V
cc
+ 10%.
4
6.42
IDT709279S/L
High-Speed 32K x 16 Synchronous Dual-Port Static RAM
Preliminary
Industrial and Commercial Temperature Ranges
DC Electrical Characteristics Over the Operating
Temperature Supply Voltage Range
(V
CC
= 5.0V ± 10%)
709279S/L
Symbol
|I
LI
|
|I
LO
|
V
OL
V
OH
Parameter
Input Leakage Current
(1)
Output Leakage Current
Output Low Voltage
Output High Voltage
Test Conditions
V
CC
= 5.5V, V
IN
= 0V to V
CC
CE
0
= V
IH
or CE
1
= V
IL
, V
OUT
= 0V to V
CC
I
OL
= +4mA
I
OH
= -4mA
Min.
___
___
___
Max.
10
10
0.4
___
Unit
µA
µA
V
V
3243 tbl 08
2.4
NOTE:
1. At Vcc < 2.0V input leakages are undefined.
DC Electrical Characteristics Over the Operating
Temperature and Supply Voltage Range
(6)
(V
CC
= 5V ± 10%)
709279X9
Com'l Only
Symbol
I
CC
Parameter
Dynamic Operating
Current
(Both Ports Active)
Test Condition
CE
L
and
CE
R
= V
IL
Outputs Disabled
f = f
MAX
(1)
Version
COM'L
IND
COM'L
IND
I
SB2
Standby Current
(One Port - TTL
Level Inputs)
CE
"A"
= V
IL
and
CE
"B"
= V
IH
(3)
Active Port Outputs
Disabled, f=f
MAX
(3)
Both Ports CE
R
and
CE
L
> V
CC
- 0.2V
V
IN
> V
CC
- 0.2V or
V
IN
< 0.2V, f = 0
(2)
CE
"A"
< 0.2V and
CE
"B"
> V
CC
- 0.2V
(5)
V
IN
> V
CC
- 0.2V or
V
IN
< 0.2V, Active Port
Outp uts Disabled , f = f
MAX
(1)
COM'L
IND
COM'L
IND
COM'L
IND
S
L
S
L
S
L
S
L
S
L
S
L
S
L
S
L
S
L
S
L
Typ.
(4)
210
210
____
____
709279X12
Com'l
& Ind
Typ.
(4)
200
200
200
200
50
50
50
50
130
130
130
130
1.0
0.2
1.0
0.2
120
120
120
120
Max.
345
305
380
340
110
90
125
105
230
200
245
215
15
5
15
5
205
185
220
200
709279X15
Com'l Only
Typ.
(4)
190
190
____
____
Max.
390
350
____
____
Max.
325
285
____
____
Unit
mA
I
SB1
Standby Current
(Both Ports - TTL
Level Inputs)
CE
L
=
CE
R
= V
IH
f = f
MAX
(1)
50
50
____
____
135
115
____
____
50
50
____
____
110
90
____
____
mA
140
140
____
____
270
240
____
____
120
120
____
____
220
190
____
____
mA
I
SB3
Full Standby Current
(Both Ports -
CMOS Level Inputs)
1.0
0.2
____
____
15
5
____
____
1.0
0.2
____
____
15
5
____
____
mA
I
SB4
Full Standby Current
(One Port -
CMOS Level Inputs)
130
130
____
____
245
225
____
____
110
110
____
____
195
175
____
____
mA
3243 tbl 09
NOTES:
1. At f = f
MAX
, address and control lines (except Output Enable) are cycling at the maximum frequency clock cycle of 1/t
CYC
, using "AC TEST CONDITIONS" at input levels of
GND to 3V.
2. f = 0 means no address, clock, or control lines change. Applies only to input at CMOS level standby.
3. Port "A" may be either left or right port. Port "B" is the opposite from port "A".
4. Vcc = 5V, TA = 25°C for Typ, and are not production tested. I
CC DC
(f=0) = 150mA (Typ).
5.
CE
X
= V
IL
means
CE
0X
= V
IL
and CE
1X
= V
IH
CE
X
= V
IH
means
CE
0X
= V
IH
or CE
1X
= V
IL
CE
X
< 0.2V means
CE
0X
< 0.2V and CE
1X
> V
CC
- 0.2V
CE
X
> V
CC
- 0.2V means
CE
0X
> V
CC
- 0.2V or CE
1X
< 0.2V
"X" represents "L" for left port or "R" for right port.
6. 'X' in part numbers indicate power rating (S or L).
6.42
5
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