HIGH-SPEED 512K (32K x 16)
SYNCHRONOUS
DUAL-PORT RAM
Integrated Device Technology, Inc.
ADVANCED
IDT70927S/L
FEATURES:
• High-speed clock-to-data output times
— Military: 35/55ns (max.)
— Commercial: 25/35/55ns (max.)
• Low-power operation
— IDT70927S
Active: 900mW (typ.)
Standby: 5mW (typ.)
— IDT70927L
Active: 900mW (typ.)
Standby: 1mW (typ.)
• 32K X 16 bits Synchronous Operation
• Architecture based on Dual-Port RAM cells
— Allows full simultaneous access from both ports
• Synchronous operation
— Data input, address, and control registers
— Fast 25ns clock to data out
— Self-timed write allows fast write cycle
— 30ns cycle times, 33MHz operation
• On-Chip counter provides burst capability for any size
burst or direct address access controlled by
ADS
• This part is available in a Flow-Through mode, with a
Pipe-lined version available soon
• Upper and lower byte accessability
• Clock enable feature
• Chip Select Feature allows power savings by allowing
control of the memory array's power usage
• Two Chip Select pins allows for either high or low activa-
tion of the memory array
• Guaranteed data output hold times
• Available in 108-pin PGA and 100-pin TQFP
• Military product compliant to MIL-STD-883, Class B
DESCRIPTION:
The IDT70927 is a high-speed 32K x 16 bit synchronous
Dual-Port RAM. The memory array is based on Dual-Port
memory cells to allow simultaneous access from both ports.
Registers on control, data, and address inputs provide low
setup and hold times. The timing latitude provided by this
approach allow systems to be designed with very short
realized cycle times. With an input data register, this device
has been optimized for applications having unidirectional data
flow or bidirectional data flow in bursts.
FUNCTIONAL BLOCK DIAGRAM
R/
L
L
R/
R
R
0L
CS
1L
L
L
0R
CS
1R
R
R
I/O
8L
-I/O
15L
I/O
Control
I/O
0L
-I/O
7L
I/O
Control
I/O
8R
-I/O
15R
I/O
0R
-I/O
7R
A
14L
A
0L
CLK
L
L
L
L
A
14R
Counter/
Address
Reg.
MEMORY
ARRAY
Counter/
Address
Reg.
A
0R
CLK
R
R
R
R
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The IDT logo is a registered trademark of Integrated Device Technology, Inc.
MILITARY AND COMMERCIAL TEMPERATURE RANGE
©1995 Integrated Device Technology, Inc.
AUGUST 1995
DSC-1300/-
1
IDT70927S/L HIGH-SPEED 512K (32K x 16)
SYNCHRONOUS DUAL-PORT RAM
ADVANCED
MILITARY AND COMMERCIAL TEMPERATURE RANGES
Fabricated using IDT’s CMOS high-performance technol-
ogy, these Dual-Ports typically operate on only 900mW of
power at maximum high-speed clock-to-data output times as
fast as 25ns. An automatic power down feature, controlled
by
CS
, permits the on-chip circuitry of each port to enter a very
low standby power mode.
The IDT70927 is packaged in a 108-pin PGA and a 100-
pin TQFP. Military grade product is manufactured in compli-
ance with the latest revision of MIL-STD-883, Class B, making
it ideally suited to military temperature applications demand-
ing the highest level of performance and reliability.
PIN NAMES AND FUNCTIONS
Left Port
A
0L
— A
14L
I/O
0L
— I/O
15L
R/
W
L
Right Port
A
0R
— A
14R
I/O
0R
— I/O
15R
R/
W
R
Names
Address
Data Input/Output
Read/Write Contol
Output Enable
Chip Select
Address Input Strobe
Usage
Separate Address and Data lines allow for parallel Address and Data use.
Data that is read and written via these lines.
Clocked control for Reading and Writing to Memory.
Internally disables output, removing Data from the Bus.
Selects or "powers up" the memory array.
OE
L
CS
0L
/ CS
1L
ADS
L
OE
R
CS
0R
/ CS
1R
ADS
R
CS
is active low and CS is
active high. The unused pin should be tied to the active mode.
When Low, loads the current address into the register, used to access
the array. When high, isolates the address bus from the register using the
value in the register to access the array.
CLK
L
CLK
R
Clock
Counter Reset
Upper Byte Select
Lower Byte Select
Power
Ground
Clock or strobe for synchronous operation.
Sets Counter=0 in the read mode, with CS active.
Selects the high order byte at the given address.
Selects the Low order byte at the given address.
Common Power.
Common Ground.
SRST
L
CNTEN
L
UB
L
LB
L
Vcc
GND
SRST
R
CNTEN
R
UB
R
LB
R
Count Advance Enable Synchronously advances the counter when active low.
ORDERING INFORMATION
IDT
XXXX
Device
Type
A
Power
999
Speed
A
Package
A
Process/
Temperature
Range
Blank
B
Commercial (0°C to +70°C)
Military (–55°C to +125°C)
Compliant to MIL-STD-883, Class C
108-pin PGA (G108-1)
100-pin TQFP (PN100-1)
G
PF
25
35
55
S
L
70927
Commercial Only
Speed in nanoseconds
Standard Power
Low Power
512K (32K x 16) Synchronous Dual-Port RAM
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