IBM043611TLAB4M x 1612/10, 3.3VMMDM15DSU-021045122.
Preliminary
Features
• 32K x 36 or 64K x 18 Organizations
• 0.45 Micron CMOS Technology
• Synchronous Pipeline Mode of Operation with
Self-Timed Late Write
• Single Differential HSTL/GTL Clock
• Single +3.3V Power Supply and Ground
• HSTL/GTL Input and Output levels
• Registered Addresses, Write Enables, Synchro-
nous Select, and Data Ins
• Registered Outputs
IBM041811TLAB
IBM043611TLAB
32K x 36 & 64K x 18 SRAM
• Common I/O
• Asynchronous Output Enable and Power Down
Inputs
• Boundary Scan using limited set of JTAG 1149.1
functions
• Byte Write Capability & Global Write Enable
• 7 x 17 Bump Ball Grid Array Package with
SRAM EDEC Standard Pinout and Boundary
SCAN Order
• Programmable Impedance Output Drivers
Description
The IBM043611TLAB and IBM041811TLAB 1Mb
SRAM
S
are Synchronous Pipeline Mode, high-per-
formance CMOS Static Random Access Memories
that are versatile, have wide I/O, and achieve 4ns
cycle times. Dual differential K clocks are used to ini-
tiate the read/write operation, and all internal opera-
tions are self-timed. At the rising edge of the K clock,
all Addresses, Write-Enables, Sync Select, and
Data Ins are registered internally. Data Outs are
updated from output registers off the next rising
edge of the K clock. An internal Write buffer allows
write data to follow one cycle after addresses and
controls. The chip is operated with a single +3.3V
power supply and is compatible with HSTL/GTL I/O
interfaces.
77H9965.T5
10/98
©IBM Corporation. All rights reserved.
Use is further subject to the provisions at the end of this document.
Page 1 of 22
IBM041811TLAB
IBM043611TLAB
32K x 36 & 64K x 18 SRAM
Preliminary
x36 BGA Pinout (Top View)
1
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
T
U
V
DDQ
NC
NC
DQ23
DQ19
V
DDQ
DQ21
DQ26
V
DDQ
DQ27
DQ32
V
DDQ
DQ34
DQ30
NC
NC
V
DDQ
2
SA8
NC
SA9
DQ18
DQ24
DQ20
DQ25
DQ22
V
DD
DQ31
DQ28
DQ33
DQ29
DQ35
SA14
NC
TMS
3
SA7
NC
SA6
V
SS
V
SS
V
SS
SBWc
V
SS
V
REF
V
SS
SBWd
V
SS
V
SS
V
SS
M1*
SA13
TDI
4
NC
NC
V
DD
ZQ
SS
G
C*
C*
V
DD
K
K
SW
SA1
SA0
V
DD
SA12
TCK
5
SA4
NC
SA5
V
SS
V
SS
V
SS
SBWb
V
SS
V
REF
V
SS
SBWa
V
SS
V
SS
V
SS
M2*
SA11
TDO
6
SA3
NC
SA2
DQ17
DQ11
DQ15
DQ10
DQ13
V
DD
DQ4
DQ7
DQ2
DQ6
DQ0
SA10
NC
NC
7
V
DDQ
NC
NC
DQ12
DQ16
V
DDQ
DQ14
DQ9
V
DDQ
DQ8
DQ3
V
DDQ
DQ1
DQ5
NC
ZZ
V
DDQ
Note:
* M1 and M2 are read protocol mode pins. For this application, M1 and M2 must be connected to V
SS
and V
DD
, respec-
tively. C-clocks must be left floating for all single-clock read protocols.
x18 BGA Pinout (Top View)
1
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
T
U
V
DDQ
NC
NC
DQ9
NC
V
DDQ
NC
DQ12
V
DDQ
NC
DQ14
V
DDQ
DQ16
NC
NC
NC
V
DDQ
2
SA8
NC
SA9
NC
DQ10
NC
DQ11
NC
V
DD
DQ13
NC
DQ15
NC
DQ17
SA15
SA13
TMS
3
SA7
NC
SA6
V
SS
V
SS
V
SS
SBWb
V
SS
V
REF
V
SS
NC
V
SS
V
SS
V
SS
M1
SA14
TDI
4
NC
NC
V
DD
ZQ
SS
G
C*
C*
V
DD
K
K
SW
SA1
SA0
V
DD
NC
TCK
5
SA4
NC
SA5
V
SS
V
SS
V
SS
NC
V
SS
V
REF
V
SS
SBWa
V
SS
V
SS
V
SS
M2
SA12
TDO
6
SA3
NC
SA2
DQ8
NC
DQ6
NC
DQ4
V
DD
NC
DQ2
NC
DQ1
NC
SA11
SA10
NC
7
V
DDQ
NC
NC
NC
DQ7
V
DDQ
DQ5
NC
V
DDQ
DQ3
NC
V
DDQ
NC
DQ0
NC
ZZ
V
DDQ
Note:
* M1 and M2 are read protocol mode pins. For this application, M1 and M2 must be connected to V
SS
and V
DD
respec-
tively. C-clocks must be left floating for all single-clock read protocols.
©IBM Corporation. All rights reserved.
Use is further subject to the provisions at the end of this document.
77H9965.T5
10/98
Page 2 of 22
Preliminary
IBM041811TLAB
IBM043611TLAB
32K x 36 & 64K x 18 SRAM
Pin Description
SA0-SA15
DQ0-DQ35
K, K
SW
SBWa
SBWb
SBWc
SBWd
TMS,TDI,TCK
TDO
Address Input
Data I/O
Differential Input-Register Clocks
Write Enable, Global
Write Enable, Byte a (DQ0-DQ8)
Write Enable, Byte b (DQ9-DQ17)
Write Enable, Byte c (DQ18-DQ26)
Write Enable, Byte d (DQ27-DQ35)
IEEE 1149.1 Test Inputs (LVTTL levels)
IEEE 1149.1 Test Output (LVTTL level)
G
SS
M1, M2
V
REF
(2)
V
DD
V
SS
V
DDQ
ZZ
ZQ
NC
Asynchronous Output Enable
Synchronous Select
Mode Inputs- Selects Read Protocol Operation.
GTL/HSTL Input Reference Voltage
Power Supply (+3.3V)
Ground
Output Power Supply
Asynchronous Sleep Mode
Output Driver Impedance Control
No Connect
Block Diagram
SA0-SA15
K
SS
ZZ
SW
SBW
SW
Register
SW
Register
2:1 MUX
RD Add
Register
Latch
WR Add
Register
Row Decode
32K x 36
or
64K x 18
Array
Column Decode
Read/Write Amp
Latch
SBW
Register
SBW
Register
Match
2:1 MUX
Write
Buffer
Data Out
Register
SS
Register
SS
Register
G
DQ0-DQ35
77H9965.T5
10/98
©IBM Corporation. All rights reserved.
Use is further subject to the provisions at the end of this document.
Page 3 of 22
IBM041811TLAB
IBM043611TLAB
32K x 36 & 64K x 18 SRAM
Preliminary
SRAM Features
Late Write
Late Write function allows for write data to be registered one cycle after addresses and controls. This feature
eliminates one bus-turnaround cycle necessary when going from a Read to a Write operation. Late Write is
accomplished by buffering write addresses and data so that the write operation occurs during the next write
cycle. When a read cycle occurs after a write cycle, the address and write data information are stored tempo-
rarily in holding registers. During the first write cycle preceded by a read cycle, the SRAM array will be
updated with address and data from the holding registers. Read cycle addresses are monitored to determine
if read data is to be supplied from the SRAM array or the write buffer. The bypassing of the SRAM array
occurs on a byte-by-byte basis. When only one byte is written during a write cycle, read data from the last
written address will have new byte data from the write buffer and remaining bytes from the SRAM array.
Mode Control
Mode control pins M1 and M2 are used to select four different JEDEC standard read protocols. The SRAM
supports the following protocols:
• Single Clock, Flow-Through (M1 = V
SS
, M2 = V
SS
)
• Pipeline (M1 = V
SS
, M2 = V
DD
)
• Register-Latch (M1 = V
DD
, M2 = V
SS
)
• Dual Clock, Flow-Through (M1 = V
DD
, M2 = V
DD
)
This datasheet only describes Pipeline functionality. Mode control inputs must be set with power-up and must
not change during SRAM operation. Dual Clock will not be offered.
Sleep Mode
Sleep Mode is enabled by switching asynchronous signal ZZ High. When the SRAM is in Sleep mode, the
outputs will go to a High-Z state and the SRAM will draw standby current. SRAM data will be preserved and a
recovery time (t
ZZR
) is required before the SRAM resumes to normal operation.
Programmable Impedance/Power-Up Requirements
An external resistor, RQ, must be connected between the ZQ pin on the SRAM and V
SS
to allow for the
SRAM to adjust its output driver impedance. The value of RQ must be 5X the value of the intended line
impedance driven by the SRAM. The allowable range of RQ to guarantee impedance matching with a toler-
ance of TBD% is between 175W and 350W. Periodic readjustment of the output driver impedance is neces-
sary as the impedance is greatly affected by drifts in supply voltage and temperature. One evaluation occurs
every 64 clock cycles and each evaluation may move the output driver impedance level only one step at a
time towards the optimum level. The output driver has 32 discrete binary weighted steps. The impedance
update of the output driver occurs when the SRAM is in High-Z. Write and Deselect operations will synchro-
nously switch the SRAM into and out of High-Z, triggering an update. The user may choose to invoke asyn-
chronous G updates by providing a G setup and hold about the K Clock to guarantee the proper update. In
order to guarantee the optimum internally regulated supply voltage, the SRAM requires 4µs of power-up time
after V
DD
reaches its operating range. Furthermore, 2048 cycles followed by a Low-Z to High-Z transition are
required to guarantee optimum output driver impedance.
©IBM Corporation. All rights reserved.
Use is further subject to the provisions at the end of this document.
77H9965.T5
10/98
Page 4 of 22
Preliminary
IBM041811TLAB
IBM043611TLAB
32K x 36 & 64K x 18 SRAM
Power-Up/ Power-Down Sequencing
The Power supplies need to be powered up in the following manner: V
DD
, V
DDQ
, V
REF
, and Inputs. The
power-down sequencing must be the reverse. V
DDQ
must never be allowed to exceed V
DD
.
Ordering Information
Part Number
IBM041811TLAB - 4
IBM041811TLAB - 4N
IBM041811TLAB - 5
IBM041811TLAB - 6
IBM041811TLAB - 7
IBM043611TLAB - 4
IBM043611TLAB - 4N
IBM043611TLAB - 5
IBM043611TLAB - 6
IBM043611TLAB -7
Organization
64K x 18
64K x 18
64K x 18
64K x 18
64K x 18
32K x 36
32K x 36
32K x 36
32K x 36
32K x 36
Speed
2.1ns Access / 4.0ns Cycle
2.25ns Access / 4.3ns Cycle
2.5ns Access / 5ns Cycle
3.0ns Access / 6ns Cycle
3.0ns Access / 7.0ns Cycle
2.1ns Access / 4.0ns Cycle
2.25ns Access / 4.3ns Cycle
2.5ns Access / 5ns Cycle
3.0ns Access / 6ns Cycle
3.0ns Access / 7.0ns Cycle
Leads
7 x 17 BGA
7 x 17 BGA
7 x 17 BGA
7 x 17 BGA
7 x 17 BGA
7 x 17 BGA
7 x 17 BGA
7 x 17 BGA
7 x 17 BGA
7 x 17 BGA
77H9965.T5
10/98
©IBM Corporation. All rights reserved.
Use is further subject to the provisions at the end of this document.
Page 5 of 22