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Integrated Device Technology Electronic Components Datasheet

IDT39C707A Datasheet

16-Word By 4-Bit Dual-Port RAM

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FEATURES:
• Fast
-Available in either industry-standard speed or 20% speed
upgraded versions
• Low-power CEMOS'·
-Military - 50mA (max.)
-Commercial - 40mA (max.)
• 16-word x 4-bit, dual-port CMOS RAM
• Non-inverting data output with respect to data input
• Easily cascadable with separate Chip Select and
Write Enable
• Separate 4-bit latches with enables for each output port
(IDT39C707/A has separate output control)
• IDT39C705A/B pin-compatible to all versions of the 29705
• IDT39C707/A pin-compatible to all versions of the 29707
• Available in 28-pin DIP and LCC
• Military product 100% screened to MIL-STD-883, Class B
DESCRIPTION:
The IDT39C705s are high-performance 16-word by 4-bit, dual-
port RAMs. Addressing any of the 16-words is performed via the
4-bit A address field with the data appearing on the A output port.
The same respective operation holds true for the B address
input/output port and can happen simultaneously with the A-port
operation. New incoming data is written into the 4-bit RAM word
selected by the B address. The D inputs are used to load new data
into the device.
Featured are two separate output ports which allow any two
4-bit words to be read from these outputs simultaneously. Also
featured is a 4-bit latch for each of the two output ports with a
common Latch Enable (LE) input being used to control all eight
latches. Two Write Enable (WE) inputs are designed such that
Write Enable 1 (WE1) and Latch Enable (LE) inputs can be
connected to the RAM to operate in an edge-triggered mode. The
Write Enable inputs control the writing of new data into the RAM.
Data is written into the B address field when both Write Enables
are LOW. If either of the Write Enables are HIGH, no data is
written into the RAM.
Three-state outputs allow several devices to be easily cascaded
for increased memory size. When OEA input is HIGH, the A
output port is in the high impedance mode. The same respective
operation occurs for the OE B input.
The IDT39C707s function identically to the IDT39C705s,
except each output port has a separate Latch Enable (LE) input.
Also, an extra Write Enable (WE) may be connected directly to
the lEN of the IDT39C203/A for improved cycle times when
compared to the IDT39C705s. The WEIBLE input can then be
connected directly to the system clock.
These performance-enhanced, pin-compatible replacements
for all respective versions ofthe 29705s and 29707s are fabricated
using IDTs high-speed, high-reliability CEMOS technology.
Military product is 100% screened to MIL-STD-883, Class B,
making them ideally suited to military temperature applications.
FUNCTIONAL BLOCK DIAGRAM
IDT39C70SAlB
0, O2 Da
-
-
A, -
-
WE,
ALa
FORCE A
ZERO
OE A
~
· 1 ·A
ADDRESS
·DECODER
~
f-- Ba
,D.UwAL-PO"RT .RA.M"
(
AB
ADDRESS
ADDRESS
B
ADDRESS
f-- B2
DECODER f-- B,
- r--- r--
A-PORT
WE B-PORT
-.........
........
I
J
-t>
........
I
A-DATA
4-BIT
LATCH
-
B-DATA
4-BIT
LATCH
J
<J- LE
<l-
I III
I II I
YBoYB,YB2YB a
MSDC705-001
CEMOS is a trademark of Integrated Device Technology, Inc.
MILITARY AND COMMERCIAL TEMPERATURE RANGES
01986 Integrated Oevice Technology, Inc.
3-99
JULY 1986
Printed in U.S.A.


Integrated Device Technology Electronic Components Datasheet

IDT39C707A Datasheet

16-Word By 4-Bit Dual-Port RAM

No Preview Available !

IDT39C70SAlB AND IDT39C707/A
l6-WORD BY 4-BIT DUAL-PORT RAM
MILITARY AND COMMERCIAL TEMPERATURE RANGES
FUNCTIONAL BLOCK DIAGRAM
IDT39C707/A
D, D.
II II
]-
-A
-
ADDRESS
DECODER
-
ALE -t>
[l6-WORD BY 4-BIT
DUAL-PORT RAM
A
ADDRESS
B
ADDRESS
A-PORT
WE
I
B-PORT
-
\..
-
B-
ADDRESS
DECODER
-
-
B.
B,
WE,
WE.
WEIBLE
.t.o....
PIN CONFIGURATIONS
IDT39C705AIB
A-DATA
4-BIT
LATCH
-
I II I
YA" YA, YA. YA.
B-DATA
4-BIT
LATCH
III I
YBo YB, YB.YB.
....A...
MSDC705-002
IDT39C707/A
D,
Do
WE,
Bo
B,
B.
B.
ALO
LE
YBo
YAo
YB,
YA,
GND
Vee
D.
D.
WE.
Ao
A,
A.
A.
OEA
OEs
YA.
YB.
YA.
YB.
MSOC705-003
0luJ 0 ... U N IPJ
III!=CC-§CC
, , ,, , I I I, II , I
:J: ," ,, ."iB,
U
U3
I u LJ
2
I
U
28 27 26,..-
25'--
WE.
B. :J6
24[: Ao
B~ :J 7
23[: A,
ALo :J8
22[-:' A.
LE :J9
21[: A3
YBo :JlO
rl rl ,.YAo
-,11
-~
20[:
19r-
, ," ", I
1n,5
,r16,
,1r7,,
,18'--
,
OEA
OEs
....... Q
N ('III f') C"J
~~t3~~~~
MSDC705-0OS
DIP
TOP VIEW
LCC
TOP VIEW
D,
Do
WE,
Bo
B,
B.
B.
ALE
WEIBLE
YBo
YA"
YB,
YA,
GND
Vee
D.
D.
WE.
A"
A,
A.
A.
OE...
OE.
YA.
YB.
YA.
YB.
MSDC705-004
cl HI
I
w
I!=
0
C
...
C
>
'
N
C
CC"J
, ,I , I I
II II
:J: ,B,
U
U3
u
2
" "U .J LJ
""U
28
27
26,..-
2SL-
B. :J6
24(:
B. :J 7
23[:
ALE :J8
22[-:'
WEIBLE :J9
21 C:
YBo :JlO
20[:
" , , , ", , , , , , , ,,YA"
-.., 11
19r-
_oJ 12
r'
13
ri
1.
1r5,
r16,
r17,
18L...-
...... Q N N C"J COl
~~t3~~~~
WE.
Ao
A,
A.
A.
OEA
OEs
MSDC705-006
3-100


Part Number IDT39C707A
Description 16-Word By 4-Bit Dual-Port RAM
Maker IDT
Total Page 2 Pages
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