HIGH-SPEED 1.8V
32K x 16
ASYNCHRONOUS
DUAL-PORT
STATIC RAM
Features:
◆
◆
IDT70P27L
◆
◆
◆
◆
True Dual-Ported memory cells which allow simultaneous
access of the same memory location
High-speed access
– Commercial: 12/15ns (max.)
– Industrial: 15ns (max.)
Low-power operation
– IDT70P27L
Active: 306mW (typ.)
Standby: 360
µ
W (typ.)
Separate upper-byte and lower-byte control for bus
matching capability
Dual chip enables allow for depth expansion without
external logic
IDT70P27 easily expands data bus width to 32 bits or more
using the Master/Slave select when cascading more than
one device
◆
◆
◆
◆
◆
◆
◆
◆
◆
M/S = V
IH
for
BUSY
output flag on Master,
M/S = V
IL
for
BUSY
input on Slave
Busy and Interrupt Flags
On-chip port arbitration logic
Full on-chip hardware support of semaphore signaling
between ports
Fully asynchronous operation from either port
LVTTL-compatible, single 1.8V (1.7V < V
DD
< 1.95V) power
supply
Available in 100-pin Thin Quad Flatpack (TQFP)
Industrial temperature range (-40°C to +85°C) is available
for selected speeds
Green parts available, see ordering information
Functional Block Diagram
R/
W
L
UB
L
CE
0L
R/W
R
UB
R
CE
0R
CE
1L
OE
L
LB
L
CE
1R
OE
R
LB
R
I/O
8-15L
I/O
0-7L
BUSY
L
(1,2)
I/O
8-15R
I/O
Control
I/O
Control
I/O
0-7R
BUSY
R
(1,2)
,
A
14L
A
0L
Address
Decoder
A
14L
A
0L
CE
0L
32Kx16
MEMORY
ARRAY
70P27
Address
Decoder
A
14R
A
0R
CE
1L
OE
L
ARBITRATION
INTERRUPT
SEMAPHORE
LOGIC
A
14R
A
0R
CE
0R
CE
1R
OE
R
R/
W
L
SEM
L
INT
L
(2)
(2)
R/
W
R
SEM
R
(2)
INT
R
5694 drw 01
M/
S
NOTES:
1)
BUSY
is an input as a Slave (M/S=V
IL
) and an output as a Master (M/S=V
IH
).
2)
BUSY
and
INT
are non-tri-state totem-pole outputs (push-pull).
APRIL 2008
6.01
1
©2008 Integrated Device Technology, Inc.
DSC 5694/1
Description:
IDT 70P27L
High-Speed 1.8V 32K x 16 Asynchronous Dual-Port Static RAM
Commercial and Industrial Temperature Range
The IDT70P27 is a high-speed 32K x 16 Dual-Port Static RAM,
designed to be used as a stand-alone 512K-bit Dual-Port RAM or as a
combination MASTER/SLAVE Dual-Port RAM for 32-bit and wider word
systems. Using the IDT MASTER/SLAVE Dual-Port RAM approach in 32-
bit or wider memory system applications results in full-speed, error-free
operation without the need for additional discrete logic.
The device provides two independent ports with separate control,
address, and I/O pins that permit independent, asynchronous access for
reads or writes to any location in memory. An automatic power down
feature controlled by the chip enables (
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 306mW of power. The IDT70P27
is packaged in a 100-pin Thin Quad Flatpack (TQFP).
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
SEM
L
V
DD
R/W
L
OE
L
V
SS
V
SS
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
73
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
A
8L
A
7L
A
6L
A
5L
A
4L
A
3L
A
2L
A
1L
A
0L
NC
INT
L
BUSY
L
V
SS
M/S
BUSY
R
INT
R
A
0R
A
1R
A
2R
A
3R
A
4R
A
5R
A
6R
A
7R
A
8R
IDT70P27PF
PN100-1
(4)
100-PIN TQFP
TOP VIEW
(5)
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
09/29/06
A
9R
A
10R
A
11R
A
12R
A
13R
A
14R
NC
NC
NC
LB
R
UB
R
CE
0R
CE
1R
SEM
R
V
SS
R/W
R
OE
R
V
SS
V
SS
I/O
15R
I/O
14R
I/O
13R
I/O
12R
I/O
11R
I/O
10R
5694 drw 02
NOTES:
1. All V
DD
pins must be connected to power supply.
2. All V
SS
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.
I/O
9L
I/O
8L
V
DD
I/O
7L
I/O
6L
I/O
5L
I/O
4L
I/O
3L
I/O
2L
V
SS
I/O1
L
I/O
0L
V
SS
I/O
0R
I/O
1R
I/O
2R
I/O
3R
I/O
4R
I/O
5R
I/O
6R
V
DD
I/O
7R
I/O
8R
I/O
9R
NC
2
IDT 70P27L
High-Speed 1.8V 32K x 16 Asynchronous Dual-Port Static RAM
Commercial and Industrial Temperature Range
Pin Names
Left Port
CE
0L
, CE
1L
R/W
L
OE
L
A
0L
- A
14L
I/O
0L
- I/O
15L
SEM
L
UB
L
LB
L
INT
L
BUSY
L
Right Port
CE
0R
, CE
1R
R/W
R
OE
R
A
0R
- A
14R
I/O
0R
- I/O
15R
SEM
R
UB
R
LB
R
INT
R
BUSY
R
M/S
V
DD
V
ss
Chip Enable
Read/Write Enable
Output Enable
Address
Data Input/Output
Semaphore Enable
Upper Byte Select
Lower Byte Select
Interrupt Flag
Busy Flag
Master or Slave Select
Power (1.8V)
Ground (0V)
5694 tbl 01
Names
3
IDT 70P27L
High-Speed 1.8V 32K x 16 Asynchronous Dual-Port Static RAM
Commercial and Industrial Temperature Range
Truth Table I – Chip Enable
(1,2,3)
CE
CE
0
V
IL
L
< 0.2V
V
IH
X
H
>V
DD
-0.2V
X
NOTES:
CE
1
V
IH
>V
DD
-0.2V
X
V
IL
X
<0.2V
Port Selected (TTL Active)
Port Selected (CMOS Active)
Port Deselected (TTL Inactive)
Port Deselected (TTL Inactive)
Mode
Port Deselected (CMOS Inactive)
Port Deselected (CMOS Inactive)
5694 tbl 02
1. Chip Enable references are shown above with the actual
CE
0
and CE
1
levels,
CE
is a reference only.
2. Port "A" and "B" references are located where
CE
is used.
3. "H" = V
IH
and "L" = V
IL
Truth Table II – Non-Contention Read/Write Control
Inputs
(1)
CE
(2)
H
X
L
L
L
L
L
L
X
R/W
X
X
L
L
L
H
H
H
X
OE
X
X
X
X
X
L
L
L
H
UB
X
H
L
H
L
L
H
L
X
LB
X
H
H
L
L
H
L
L
X
SEM
H
H
H
H
H
H
H
H
X
Outputs
I/O
8-15
High-Z
High-Z
DATA
IN
High-Z
DATA
IN
DATA
OUT
High-Z
DATA
OUT
High-Z
I/O
0-7
High-Z
High-Z
High-Z
DATA
IN
DATA
IN
High-Z
DATA
OUT
DATA
OUT
High-Z
Mode
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
5694 tbl 03
NOTES:
1. A
0L
— A
14L
≠
A
0R
— A
14R.
2. Refer to Chip Enable Truth Table.
Truth Table III – Semaphore Read/Write Control
Inputs
(1)
CE
(2)
H
X
H
X
L
L
R/W
H
H
OE
L
L
X
X
X
X
UB
X
H
X
H
L
X
LB
X
H
X
H
X
L
SEM
L
L
L
L
L
L
Outputs
I/O
8-15
DATA
OUT
DATA
OUT
DATA
IN
DATA
IN
______
I/O
0-7
DATA
OUT
DATA
OUT
DATA
IN
DATA
IN
______
Mode
Read Data in Semaphore Flag
Read Data in Semaphore Flag
Write I/O
0
into Semaphore Flag
Write I/O
0
into Semaphore Flag
Not Allowed
Not Allowed
5694 tbl 04
↑
↑
X
X
______
______
NOTES:
1. There are eight semaphore flags written to I/O
0
and read from all the I/Os (I/O
0
-I/O
15
). These eight semaphore flags are addressed by A
0
-A
2
.
2. Refer to Chip Enable Truth Table.
4
IDT 70P27L
High-Speed 1.8V 32K x 16 Asynchronous Dual-Port Static RAM
Commercial and Industrial Temperature Range
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 V
DDMAX
+0.3V
Unit
V
Maximum Operating Temperature
and Supply Voltage
(1)
Grade
Commercial
Industrial
Ambient
Temperature
0
O
C to +70
O
C
-40
O
C to +85
O
C
GND
0V
0V
V
DD
1.7V < V
DD
< 1.95V
1.7V < V
DD
< 1.95V
5694 tbl 06
T
BIAS
T
STG
I
OUT
-55 to +125
-65 to +150
50
o
C
C
NOTES:
1. This is the parameter T
A
. This is the "instant on" case temperature.
o
mA
5694 tbl 05
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
DD
+ 0.3V for more than 25% of the cycle time or 10ns
maximum, and is limited to < 20mA for the period of V
TERM
> V
DD
+ 0.3V.
Recommended DC Operating
Conditions
(1)
Symbol
V
DD
V
SS
V
IH
Parameter
Supply Voltage
Ground
Input High Voltage
Input Low Voltage
Min.
1.7
0
0.7V
DD
-0.3
(1)
Typ.
1.8
0
____
____
Max.
1.95
0
V
DD
+0.3V
(2)
0.3V
DD
Unit
V
V
V
V
5694 tbl 07
Capacitance
Symbol
C
IN
C
OUT
(2)
(1)
V
IL
(T
A
= +25°C, f = 1.0mhz)TQFP ONLY
Parameter
Input Capacitance
Output Capacitance
Conditions
V
IN
= 0V
V
OUT
= 0V
Max.
9
10
Unit
pF
pF
5694 tbl 08
NOTES:
1. V
IL
> -1.5V for pulse width less than 10ns.
2. V
TERM
must not exceed V
DD
+ 0.3V.
NOTES:
1. This parameter is determined by device characterization but is not
production tested.
2. C
OUT
also reference C
I/O
.
DC Electrical Characteristics Over the Operating
Temperature and Supply Voltage Range
(1.7V < V
DD
< 1.95V)
70P27L
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
DD
= 1.95V, V
IN
= 0V to V
DD
CE
= V
IH
, V
OUT
= 0V to V
DD
I
OL
= 2mA
I
OH
= -2mA
Min.
___
Max.
5
5
0.45
___
Unit
µA
µA
V
V
5694 tbl 09
___
___
V
DD
- 0.45
5
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