VERY LOW POWER 1.8V
8K/4K x 16 DUAL-PORT
STATIC RAM
Features
◆
◆
IDT70P257/247L
◆
◆
◆
True Dual-Ported memory cells which allow simultaneous
reads of the same memory location
High-speed access
– Industrial: 55ns (max.)
Low-power operation
IDT70P257/247L
Active: 27mW (typ.)
Standby: 3.6
µ
W (typ.)
Separate upper-byte and lower-byte control for multiplexed
bus compatibility
IDT70P257/247 easily expands data bus width to 32 bits or
more using the Master/Slave select when cascading more
than one device
◆
◆
◆
◆
◆
◆
◆
◆
◆
◆
◆
M/S = V
DD
for
BUSY
output flag on Master
M/S = V
SS
for
BUSY
input on Slave
Input Read Register
Output Drive Register
BUSY
and Interrupt Flag
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 (±100mV) power supply
Available in 100 Ball 0.5mm-pitch BGA
Industrial temperature range (-40°C to +85°C)
Green parts available, see ordering information
Functional Block Diagram
R/W
L
UB
L
R/W
R
UB
R
LB
L
CE
L
OE
L
LB
R
CE
R
OE
R
I/O
8L
-I/O
15L
I/O
0L
-I/O
7L
BUSY
L
(2,3)
I/O
8R
-I/O
15R
I/O
Control
I/O
Control
I/O
0R
-I/O
7R
BUSY
R
(2,3)
,
A
12L
(1)
A
0L
Address
Decoder
MEMORY
ARRAY
Address
Decoder
A
12R
(1)
A
0R
CE
L
OE
L
R/W
L
IRR
0
,IRR
1
INPUT
READ REGISTER
AND
OUTPUT
DRIVE REGISTER
SFEN
13
13
CE
R
OE
R
R/W
R
ODR
0
-
ODR
4
CE
L
OE
L
R/W
L
SEM
L
(3)
INT
L
ARBITRATION
INTERRUPT
SEMAPHORE
LOGIC
CE
R
OE
R
R/W
R
SEM
R
INT
R
(3)
5684 drw 01
M/S
NOTES:
1. A
12X
is a NC for IDT70P247.
2. (MASTER):
BUSY
is output; (SLAVE):
BUSY
is input.
3.
BUSY
outputs and
INT
outputs are non-tri-stated push-pull.
JANUARY 2009
1
DSC-5684/4
©2009 Integrated Device Technology, Inc.
IDT70P257/247L
Low Power 1.8V 8K/4K x 16 Dual-Port Static RAM
Industrial Temperature Range
Description
The IDT70P257/247 is a very low power 8K/4K x 16 Dual-Port
Static RAM. The IDT70P257/247 is designed to be used as a stand-alone
128/64K-bit Dual-Port SRAM or as a combination MASTER/SLAVE Dual-
Port SRAM for 32-bit-or-more word systems. Using the IDT MASTER/
SLAVE Dual-Port SRAM approach in 32-bit or wider memory system
applications results in full-speed, error-free operation without the need for
additional discrete logic.
This 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
CE
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 27mW of power.
The IDT70P257/247 is packaged in a 100 ball 0.5mm- pitch Ball
Grid Array. The package is a 1mm thick and designed to fit in wireless
handset applications.
Pin Configurations
(2,3,4)
70P257/247BY
BY-100
02/04/04
100-Ball 0.5mm Pitch BGA
Top View
(5)
A2
A3
A4
A5
A6
A7
A8
A9
A10
A1
A
5R
B1
A
8R
B2
A
11R
B3
UB
R
B4
Vss
B5
SEM
R
I/O
15R
I/O
12R
I/O
10R
B6
B7
B8
B9
Vss
B10
A
3R
C1
A
4R
C2
A
7R
C3
A
9R
C4
CE
R
C5
R/W
R
C6
OE
R
C7
V
DD
C8
I/O
9R
I/O
6R
C9
C10
A
0R
D1
A
1R
D2
A
2R
D3
A
6R
D4
LB
R
D5
IRR
1
D6
I/O
14R
I/O
11R
I/O
7R
D7
D8
D9
Vss
D10
ODR
4
ODR
2
BUSY
R
INT
R
E1
E2
E3
E4
A
10R
E5
A
12R
(1)
E6
I/O
13R
I/O
8R
E7
E8
I/O
5R
E9
I/O
2R
E10
Vss
F1
M/S
F2
ODR
3
F3
INT
L
F4
Vss
F5
Vss
F6
I/O
4R
F7
V
DD
F8
I/O
1R
F9
Vss
F10
SFEN
ODR
1
BUSY
L
G1
G2
G3
A
1L
G4
V
DD
G5
Vss
G6
I/O
3R
G7
I/O
0R
I/O
15L
V
DD
G8
G9
G10
ODR
0
H1
A
2L
H2
A
5L
H3
A
12L
(1)
H4
OE
L
H5
I/O
3L
I/O
11L
I/O
12L
I/O
14L
I/O
13L
H6
H7
H8
H9
H10
,
A
0L
J1
A
4L
J2
A
9L
J3
LB
L
J4
CE
L
J5
I/O
1L
J6
V
DD
J7
NC
J8
NC
J9
I/O
10L
J10
A
3L
K1
A
7L
K2
A
10L
K3
IRR
0
K4
V
DD
K5
Vss
K6
I/O
4L
K7
I/O
6L
K8
I/O
8L
K9
I/O
9L
K10
A
6L
A
8L
A
11L
UB
L
SEM
L
R/W
L
I/O
0L
I/O
2L
I/O
5L
I/O
7L
5684 drw 02b
NOTES:
1. A
12X
is a NC for IDT70P247.
2. All V
DD
pins must be connected to power supply.
3. All V
SS
pins must be connected to ground supply.
4. BY100-1 package body is approximately 6mm x 6mm x 1mm, ball pitch 0.5mm.
5. This package code is used to reference the package diagram.
6. This text does not indicate orientation of the actual part-marking.
6.42
2
IDT70P257/247L
Low Power 1.8V 8K/4K x 16 Dual-Port Static RAM
Industrial Temperature Range
Pin Names
Left Port
CE
L
R/W
L
OE
L
A
0L
- A
12L
(1)
I/O
0L
- I/O
15L
SEM
L
UB
L
LB
L
INT
L
BUSY
L
CE
R
R/W
R
OE
R
A
0R
- A
12R
(1)
I/O
0R
- I/O
15R
SEM
R
UB
R
LB
R
INT
R
BUSY
R
IRR
0
, IRR
1
ODR
0
- ODR
4
SFEN
(2)
M/S
V
DD
V
SS
Right Port
Names
Chip Enable (Input)
Read/Write Enable (Input)
Output Enable (Input)
Address (Input)
Data Input/Output
Semaphore Enable (Input)
Upper Byte Select (Input)
Lower Byte Select (Input)
Interrupt Flag (Output)
Busy Flag
Input Read Register (Input)
Output Drive Register (Output)
Special Function Enable (Input)
Master or Slave Select (Input)
Power (1.8V) (Input)
Ground (0V) (Input)
5684 tbl 01
NOTE:
1. A
12X
is a NC for IDT70P247.
2.
SFEN
is active when either
CE
L
= V
IL
or
CE
R
= V
IL
.
SFEN
is inactive when
CE
L
=
CE
R
= V
IH
.
Truth Table I: Non-Contention Read/Write Control
Inputs
(1)
CE
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
I/O
8-15
High-Z
High-Z
DATA
IN
High-Z
DATA
IN
DATA
OUT
High-Z
DATA
OUT
High-Z
Outputs
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
5684 tbl 02
NOTE:
1. A
0L
— A
12L
≠
A
0R
— A
12R
for IDT70P257; A
0L
— A
11L
≠
A
0R
— A
11R
for IDT70P247.
6.42
3
IDT70P257/247L
Low Power 1.8V 8K/4K x 16 Dual-Port Static RAM
Industrial Temperature Range
Truth Table II: Semaphore Read/Write Control
(1)
Inputs
CE
H
X
H
X
L
L
R/W
H
H
↑
↑
X
X
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
I/O
8-15
DATA
OUT
DATA
OUT
DATA
IN
DATA
IN
____
____
Outputs
I/O
0-7
DATA
OUT
DATA
OUT
DATA
IN
DATA
IN
____
____
Mode
Read Data in Semaphore Flag
Read Data in Semaphore Flag
Write D
IN0
into Semaphore Flag
Write D
IN0
into Semaphore Flag
Not Allowed
Not Allowed
5684 tbl 03
NOTE:
1. There are eight semaphore flags written to via I/O
0
and read from all of the I/O's (I/O
0
-I/O
15
). These eight semaphores are addressed by A
0
-A
2
.
Absolute Maximum Ratings
(1)
Symbol
V
TERM
V
TERM
(2)
T
BIAS
(3)
T
STG
T
JN
I
OUT
Rating
Supply Voltage on V
DD
with Respect to GND
Terminal Voltage with
Respect to GND
Temperature Under Bias
Storage Temperature
Junction Temperature
DC Output Current
Industrial
-0.5 to +2.9
-0.5 to V
DD
+0.3
-55 to +125
-65 to +150
+150
20
Unit
V
V
o
C
C
C
o
o
mA
5684 tbl 04
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 over V
TERM
= V
DD
+ 0.3V
.
3. Ambient Temperature under DC Bias. No AC Conditions. Chip Deselected.
6.42
4
IDT70P257/247L
Low Power 1.8V 8K/4K x 16 Dual-Port Static RAM
Industrial Temperature Range
Capacitance
Symbol
C
IN
C
OUT
(TA = +25°C, f = 1.0MHz)
Parameter
Input Capacitance
Output Capacitance
Conditions
(2)
V
IN
= 3dV
V
OUT
= 3dV
Max.
9
11
Unit
pF
pF
5684 tbl 07
Maximum Operating Temperature
and Supply Voltage
(1)
Grade
Industrial
Ambient
Temperature
-40
O
C to +85
O
C
GND
0V
V
DD
1.8V
+
100mV
5684 tbl 05
NOTES:
1. This parameter is determined by device characterization but is not production
tested.
2. 3dV references the interpolated capacitance when the input and output signals
switch from 0V to 3V or from 3V to 0V.
NOTES:
1. This is the parameter T
A
. This is the "instant on" case temperature.
Recommended DC Operating Conditions
Symbol
V
DD
V
SS
V
IH
V
IL
Parameter
Supply Voltage
(3)
Ground
Input High Voltage
Input Low Voltage
Min.
1.7
0
1.2
-0.2
Typ.
1.8
0
___
Max.
1.9
0
V
DD +
0.2
0.4
Unit
V
V
V
V
5684 tbl 06
___
NOTES:
1. V
IL
> -1.5V for pulse width less than 10ns.
2. V
TERM
must not exceed V
DD
+ 0.3V.
3. M/S operates at the V
DD
and V
SS
voltage levels.
6.42
5
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